丹麦专利DK201570194A1 Bag run and method of making such bag run

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专利摘要:
There is disclosed a bag web having a continuous web of laterally folded bag items formed by two overlaid foil webs forming opposite front and back sides of a bag item. The folded portions of the first foil web are positioned between the front and back of the bag blank to form at least one first folded side of the bag blank, which first folded side is formed of material from the first foil web. This avoids the need to insert separate pieces to form side folds.
公开号:DK201570194A1
申请号:DKP201570194
申请日:2015-04-01
公开日:2016-08-22
发明作者:Henrik Pape
申请人:Schur Tech As；
IPC主号:

专利说明:

Bags and Method of Preparing Such Bags The Field of the Invention
The present invention relates to a bag web having a continuous web of laterally folded bag blanks formed by a first and second superposed foil web forming opposite front and back faces of a bag blank.
The invention further relates to a method of producing a bag web having a continuous web of laterally folded bag pieces formed by a first and a second superposed foil web forming opposite front and back sides of a bag blank, and wherein folded portions of the first foil web are located between the front and back of the bag blank to form folded sides in the bag blank.
BACKGROUND OF THE INVENTION
Bags are known for making bags of the type with side and bottom pieces connected to the flat sides. It will usually be folded sides and / or bottom. This type of bag is also known as gusset bag or cross-bottom bag or also known as side-gusseted bag where short sides of flat bag are formed. Thus, in these bags are placed side pieces and bottom pieces which are welded to the large flat sides of the bag. Such bags are formed in webs with a series of parallel bag items made of two superposed foil webs. Between the two foil webs, separately folded foil pieces are placed to form the folded side pieces of the bag - and possibly also bottom pieces. This web is cut to form individual bags. The bags may be fitted with a zipper closure. The bags are subsequently filled by transferring the individual bags to a filling station where filling is done. An example of such a web and its preparation is described in EP 1,250,999.
There has been a desire for many years to be able to manufacture folded bags in a way that can increase the filling speed and to be able to manufacture the bags with side folds and possibly also bottom folds cheaper.
The object of the invention
SUMMARY OF THE INVENTION It is an object of the invention to provide a bag web as well as a method for making such a bag web, where bag items appear as folded bags made without the need for separate folded foil pieces to form the folded side pieces of the bag. Furthermore, it is an object to provide such a continuous web of bag items which can be conveyed through a filling station, thereby providing a high filling rate.
Description of the Invention
This object is achieved in accordance with the present invention with a bag web of the kind mentioned initially, characterized in that folded portions of the first foil web are located between the front and back sides of the bag blank to form at least one first folded side of the bag blank, said first folded side is formed of material from the first foil web.
The method of the invention is characterized in that it comprises steps in which: A - a first and a second superposed film web are advanced from a film web layer.
B - a portion of the first foil web is folded, at least one folding knife being displaced in a direction across the feed direction of the first foil web towards the second foil web, thereby establishing a first fold along a first fold line at the edge of the folding knife, C - folding the folded portion down towards the first foil web about a second fold line between the folded portion and the first foil web, D - fixing the folded portion in its position against the first foil web, E - placement of the second foil web in an overlaid position above the first foil web, F - welding the two superposed foil webs with transverse welds at the folded portions so that the folded portions are placed in the bag blanks between the front and back thereof, G - welding the two superposed foil webs at least along a longitudinal side edge at a bottom of the bag blanks.
According to one embodiment, the bag web may be characterized in that the folded portions of the first foil web also form a second folded side in the bag blank.
Thus, with a method and a bag web according to the invention, it is possible to form the side folds of the bags from the folded portions of the first foil web. This avoids the need to use separate folded foil pieces to produce the folded side of the bag. Thereby, a substantial simplification of the design of a bag web and a method of manufacture is obtained to produce such a bag web.
According to a further embodiment, the bag web may be characterized in that the two overlaid foil webs have the same width and that the folded parts extend over the entire width of the foil webs.
With this embodiment, it is possible to produce bags having a height corresponding to the width of the foil webs and wherein the side edges of the bag are provided with folds extending over the entire height of the bag.
According to a further embodiment, the bag web may be characterized in that the folded parts are adhered to the first foil web, from which the folded parts are unfolded by spot welds along fold lines between the folded part and the first foil web.
By attaching the folded portions and the foil web from which they are unfolded, a fixation of the folds around the fold lines is achieved. This is appropriate when handling the bag web. In the finished bag web, it will be possible to weld along the fold lines between the folded portion and the associated foil web. This results in a greater stiffness in the formed bag.
According to a further embodiment, the bag web may be characterized in that the superposed bag webs are made of multilayer foils where at least one outer layer of the first and second facing webs is made of a weldable plastic material, preferably PE or PP, and at least one outer layer of the first and second facing webs of film is made of a non-weldable plastic material, preferably PET, OPA or OPP.
By using multilayer foils, it is possible to weld together the surfaces which are desired to be welded and to avoid welding of the outer layers facing away from each other. This makes it possible to weld at the fold lines between the folded part and the associated foil web, even though the heat is passed through the folded part. Thus, edge areas along the fold lines in the edge region of the folded portion will not be welded together, since the materials placed against each other will be made of the non-weldable plastic material.
According to a further embodiment, the bag web may be characterized in that a zipper closure is provided on the first or second foil web, the zipper closure comprising cooperating zipper portions, and that a weakening line or perforation can be readily provided in parallel with it. for establishing an access opening to the interior of a finished bag, which access opening can be opened and closed by means of the zipper closure.
Thus, in this bag, the zipper can be placed in a technically simple manner and an access opening for contents in the bag will be formed in one of the bag's flat sides. The advantage of this bag is that it is easy to manufacture, so it is completely airtight.
the bag web being characterized in that cooperating zipper portions of a zipper closure are arranged opposite one another on the foil webs forming opposite front and back sides of the foil web of the bag, and that these cooperating zipper portions are arranged parallel to the opening edges thereof in order to establish a access opening to the interior of a finished bag, which access opening can be opened and closed by means of the zipper lid.
With this location of the zipper lid, the access opening will be formed at the top of the bag between the rim area of the two flat sides. This provides a large access opening.
According to a further embodiment, the bag web may be characterized in that the bag web along its orifice edges comprises edge strip areas prepared with a series of holes or similar star perforations intended to be guided with guide means adapted to hold and guide edge areas at the opposing bag mouth edges along a conveying path through a filling station, the bag web being of the type consisting of a continuous series of bag items separated by a plurality of slits extending from a bottom edge of the web up to a distance below a top edge get out of the way.
With such a bag path it becomes possible to establish a filling with known equipment. Such equipment is described, for example, in EP 1,087,890 and EP 1,451,069. Both of these writings describe holding pins which serve to engage the holes in the edge strip areas. This ensures a secure carrying and propulsion intervention. These bags have only been described as flat bags.
Thus, with the present invention, known filling equipment can be used in combination with bag webs, wherein the side folds are formed in a very simple manner relative to the bag webs where side folds are formed from separate folded foil pieces.
Thus, it is possible to use the folded bags and increase their filling rate relative to previous individual filling, as described in EP 1,250,999.
According to a further embodiment, the bag web may be characterized in that the folded parts extend over part of the width of the foil webs and that material located in the edge webs of the bag webs at the folded parts and at bag mouth edges is removed over a distance corresponding to the length of the foil webs. to the length of the foil web used to form the folded portions so that the edge region appears substantially unbroken and without folding.
With such a design, a bag web provided with border strip areas can be folded in such a way that the edge area appears unbroken and without folding. By removing a portion of the bag webs in the edge region in a position above the folded portions, it will be easy to establish a bag web whose edge strip regions can be used to establish the guide connection by the guide means.
According to a further embodiment, the method may be characterized in that - step C comprises displacing the folded portion against the first foil web so that half of the folded portion on each side of the first fold line folds to each side about each of the other two fold lines between the folded portion and the first foil web, thereby folding about third fold lines of each half of the folded portion.
With this embodiment, a simple formation of a fold is achieved, with the use of only one folding knife. When the folding knife has displaced the folded part to the desired height, an engagement with a restraint is established. When the backing is brought down towards the first bag web at the same time as the retracting of the folding knife, on each side of the first fold line, third fold lines will be formed midway between the first fold line and the second fold lines provided between the folded portion and the first foil web. These second and third fold lines can be secured if the retaining plate pressing the folded portion down towards the first foil web is heated. Likewise, the retaining plate may be provided with the heat pads which are directed toward edge regions along the first and / or second fold lines, so that spot welds are established along the fold lines so that the folded portion is retained fixed with the desired folding.
After the folded parts are fixed on the first foil web, the second foil web will be positioned in an overlaid position with respect to the first foil web, after which the necessary welds are made to form the bag items.
According to a further embodiment, the method may be characterized in that - step B comprises folding two parallel folding knives, which are both displaced in the direction transversely of the direction of advance of the first foil web towards the second foil web, thereby establishing two parallel first folds, and - step C comprises folding the folded portions on each side about the other fold lines between the folded portion and the first foil web.
With this embodiment, two parallel folding knives are used. A folded portion is formed at each of the folding blades. The folding knives are led to their outer position, where the folded parts are established with the desired size. In this way, the folding knives can be retracted, while a restraint is directed towards the folding, so that the folded parts are folded to each side. Hereby, a special assurance is obtained that the folded parts are folded around the other fold lines which are between the folded part and the first foil web. Hereby, the third fold line will be established at the outer edge of the folding blades. Thus, with this embodiment, no first fold line will appear. With this embodiment, different sizes of the folded parts can be operated if desired.
When the folded parts are moved to each other about the other fold lines, a spot welding can be established, as described above.
It should be noted that the backing can either be provided in the form of a plate which is parallel to the foil web and which is translationally moved in a movement towards and away from the foil web in coordinated movement with the folding blades.
Alternatively, the head restraint may be provided by an endless belt which is pivotally mounted in a position above the seam knife or seam knives.
With a stop in the form of an endless tape, it will be possible to pass the second film web along the endless tape so that it is engaged with the folded parts during their folding towards the first film web. This enables the process of forming the bag webs to be established more quickly.
After the joined first and second foil webs have been superimposed, they are passed through welding equipment which establishes welds to form the bag blanks.
When forming the bag items it is noted that the necessary welds can be established to form the finished bag item.
In a finished bag blank, a bottom may optionally be formed by a folded portion of one of the bag webs or by placing a separately folded bottom piece which is welded to the bag sides of the bag blank.
According to a further embodiment, the method may be characterized in that Alternatively the method may involve folding of parts from both foil webs at steps wherein - step B comprises folding part of the first foil web by displacing one folding knife in a direction transverse to it. feeding direction of the first foil web in the direction of the second foil web, thereby establishing a first fold along a first fold line at the edge of the folding knife, and folding a portion of the second foil web by displacing one further folding knife in a direction across the second foil path feeding direction in the direction against the first foil web, thereby establishing a first fold along a first fold line at the edge of the further folding knife, and that - step C comprises folding each of the two folded parts down towards the associated foil path around the second fold line between the folded portion and the associated with foil web, and that - step D comprises the folded parts are fixed in their position in abutment against the associated foil web.
With this method, the side folds of the bag blanks may be made from folded portions of the first foil web and second foil web. Thus, the folded portions can be displaced in the direction of the opposing film web. With this embodiment, the advantage is obtained that it will be possible to operate at the same feed rate for both foil webs, with equal folded parts being established in each of the two foil webs. The two foil webs will thus appear the same length both before and after the folding operation.
According to a further embodiment, the method may be characterized in that the method comprises the selection of foil webs made of multilayer foil, wherein at least one outer layer of the first and second foil web facing each other is made of a weldable plastic material, preferably PE or PP and wherein at least one outer layer of the first and second facing webs apart is made of a non-weldable plastic material, preferably PET, OPA or OPP.
By using multilayer foils, it is possible to weld together the surfaces which are desired to be welded and to avoid welding of the outer layers facing away from each other. This makes it possible to weld at the fold lines between the folded part and the associated foil web, even though the heat is passed through the folded part. Thus, edge areas along the fold lines in the edge region of the folded portion will not be welded together, since the materials placed against each other will be made of the non-weldable plastic material.
According to a further embodiment, the method may be characterized in that - step B comprises holding the first fold along the first fold line at the edge of the folding knife by clamping the foil web between the edge of the folding knife and a retaining means.
As mentioned above, the folding knife will be able to cooperate with a restraint. The counterhold can be clamped against the folding knife so that the folded part is retained. This provides a special security for the establishment of folding in a desired position.
It should be noted that the restraint can be brought down towards the first foil web, so that the seam knife immediately clamps the foil web against the restraint and retains such retention during the movement of the seam knife. Alternatively, the folding knife and the retainer can only be clamped when the folding knife has its outer position. In both situations, the abutment and folding knife will be guided simultaneously towards the first foil web for the folding around the second fold edges between the folded portions and the first foil web.
According to a further embodiment, the method may be characterized in that - step B comprises using a pivotable or displaceable restraint so that the first fold along the first fold line at the edge of the folding knife is retained from the initial formation of the fold and during the subsequent step C.
By using the pivotable or slidable restraint, retention may be effected from the initial formation of the fold and throughout the fold. As mentioned above, this is particularly advantageous for establishing a safe position of the fold and a safe size of the fold.
According to a further embodiment, the method may be characterized in that - step D comprises fixing the folded part by means of welding means arranged in the head restraint.
By fixing the folded portions, a more secure positioning of the folding is achieved before it is subsequently engaged between two superposed foil webs and the subsequent welding to form a pouch.
The fixation of the folded parts will preferably be spot welds. Alternatively, along the second fold lines and near the first fold line, a continuous weld between the folded portion and the first web may be established at one side and the folded portion and the second bag web at the other side. Hereby the folded part of the bag with rigid edges appears at the connection with the large flat sides of the bag.
Similarly, at a bottom portion, welds to the long sides of the bag will also be used to establish a rigid bag bottom.
According to a further embodiment, step A may comprise first and optionally also a second superposed foil web from a foil web layer using a first set of rollers in front of the folding step and a second set of rolls after the folding step which rolls clamp about the associated foil web and are used for advancing the foil web, the first and second roll pairs having differentiated rotation during the folding step.
By using different roll sets before and after the folding step, it is possible to operate with differentiated and controlled feed rate, which ensures that the two foil webs are fed at the correct speed in relation to the feed rate of the bag web formed after folding and welding has been established. .
According to a further embodiment, the method may be characterized in that - step F is performed at one position after the second set of rollers.
With welding of the two superposed foil webs with transverse welds after the second set of rollers, a uniform feed rate will be established for both the superimposed foil webs.
According to a further embodiment, the method may be characterized in that the method comprises a further step H in which, between subsequent bag items, a transverse cut extending from a bottom edge of the foil webs up to a portion below an upper edge of the web for forming a continuous row of bagpieces separated by a number of up slots.
With such cutting, a bag web is established which is continuous along an edge area. Such a bag web will be suitable for use in traditional filling equipment.
According to a further embodiment, the method may be characterized in that the bag web along its mouth edges comprises edge strip areas prepared with a series of holes or corresponding star perforations intended to be guided with guide means adapted to hold and guide edge areas at the opposite bag mouth edges along a conveying path through a filling station.
In practicing the invention, one can use the bag details and method details known from the technique of the two European patents EP 1,087,890 and EP 1,451,069, the contents of which are hereby incorporated by reference.
In practicing the invention, one can also use the structural details for making the bag web bag items known from European patent EP 1,250,999, the contents of which are hereby incorporated by reference.
By providing edge strip areas which are prepared with holes, the method will be suitable for the manufacture of a bag web which can be used in known loading equipment, where guide means are provided which engage the holes of the edge strip areas to establish a secure retention and control of bag path through a filling station.
drawing Description
The invention will then be explained in more detail with reference to the accompanying schematic drawing, wherein
FIG. 1 is a perspective view illustrating a technique known from EP 1,087,890 with a bag web comprising a variety of bag items which may be designed in accordance with the present invention;
FIG. Figure 2 is a perspective partial view of a bag web according to the invention, with a series of bag items provided with a zip closure - and with bag items in a partially opened condition;
FIG. 3 is a perspective partial view of a bag web according to the invention with the bag items having a different type of zipper closure and shown in almost full open condition
FIG. 4 shows a perspective partial view of steps of the method according to the invention,
FIG. 5 is a schematic view illustrating the method according to the invention using a folding knife and a retaining plate for forming folded parts in the first foil web,
FIG. 6-8 show three different principle sketches to illustrate steps in the process of forming and fixing the fold,
FIG. 9-16 are partial views illustrating steps of the method of the invention,
FIG. 17 shows principle sketches of a method according to the invention using a folding knife for forming the folded parts from a first foil web,
FIG. 18 shows a partial view of steps in a further embodiment of the method according to the invention,
FIG. 19 shows principle sketches similar to FIG. 17 of another embodiment of the step of the method according to the invention for forming the folded parts using a folding knife,
FIG. 20 is a schematic diagram similar to FIG. 19 to illustrate another embodiment of the step of the method using two parallel folding knives to form the folded portions of the first foil web,
FIG. Fig. 21 is a schematic sketch of a foil web according to the invention, with a series of bagpieces removing a portion of an edge area provided with holes or perforations, and
FIG. 22 shows an enlarged sectional view through the folded parts after welding the two foil webs.
DETAILED DESCRIPTION OF THE INVENTION In the description of the figures, identical or similar elements will be denoted by the same reference numerals in the various figures. Thus, no explanation of all details will be given in connection with each figure / embodiment.
FIG. 1 illustrates a principle for designing a bag web 4 with border areas at the outer opposite bag mouth edges as well as guide means adapted to hold and fabricate the border areas at the opposite bag mouth edges so that the bag web can be conveyed through a filling apparatus 36 as a continuous web. In this figure, bagpieces 12 are shown in a simplified form and thus the side folds of the bags are not directly visible.
In FIG. 1, it is shown that from a supply roll 2 a bag web can be wound in the form of a film material web 4 consisting of a double foil folded around a bottom edge 6, which is gathered along the top edge by a simple weld 8, without any bending or thickening of any kind. Therefore, it may also be a tube film. In the web there are a series of up slots 10 extending from the bottom edge 6 up to a distance below the top edge 8, so that the web occurs with mutually separated bag blanks 12, the side edges of which include lateral folds and are closed by welds 14. Just above the top of the slots 10, the double web is intersected by horizontal respective lines 16 which extend a short distance to both sides of the corresponding slots 10.
Between the top edge 8 and the cut bars 16, the edge regions 40 of the web are pierced by a single row of perforation holes 18.
This pre-made web 4, which, rather than being rolled up, can appear better in a zig-zag-folded storage box, is wound by a filling assembly on a support bar or rail 20 starting from a fixed support portion 22 of the assembly and serving. for simple support of the closed top edge 8 of the web 4.
A little in front of the support part 22, the support rod 20 has a projecting knife element 24 which, when extending the web 4, will continuously cut its upper edge, and then a continuing support system consisting of opposed, parallel support chains 26, which are formed with raised holding pins 28 for engagement, is arranged. with the holes 18 in the respective upper portions of the web 4 on both sides, and of a pressure roller 30 which, after entering the foil web, acts to pull the said unfolded upper regions of the web 4 against the firmly supported support chains 26, for horizontal abutment against their upper sides and thereby during pivoting of the holes 18 in such a way that the holes 18 are pivoted and engage over the chain pins 18. The pressure roller 30 has retracted grooves 32 to allow free passage of the outer end portions of the chain pins 28, and in these grooves transverse pins are not embedded in a manner shown, which can interact in a gear-like manner the chain pins 28 for automatic synchronous operation of the pressure roller 30.
The opposite upper portions of the web 4 will then be firmly anchored to the supporting pins 28, and the carrier chains may then be guided through a desired course of successive opening of the bag blanks as indicated at 34, whereby they may be filled by a filler 36 located above the bag bag. and for closing the blanks after filling them. The filling apparatus 36 is provided with a filling unit in the form of a filling nozzle 38. It is unnecessary to state this in more detail. However, it should be noted that the pins 28 are disposed in the neutral lines of the chains so that the bag blank is not subjected to stretching or slacking during passages with directional changes.
By welding closure of the bag blanks immediately below the top of the slots 10 and optionally a subsequent cutting, the filled bags are released from the remaining portion of the web, which is wound up as excess. It should be mentioned that on the fixed support part 22 there is preferably arranged a guide body with a double-wing plow-cut shape, which actively produces or initiates the shown unfolding of the perforated web edge areas, whereby improved safety can be achieved with regard to the essential function of the downhole of the holes. over pins 28 are.
FIG. 2 shows a section of another embodiment of a bag web according to the invention with a plurality of bag blanks 12 in a location where pins 28 on the support chains 26 are located through openings 48 in edge strip areas 50. The bag blanks are provided with a zipper closure 58. The edge strip areas 50 are thus disposed at the edges of the bag mouth 52 so that the edge strip areas 50 are contiguous with the bag blanks 12.
The bag blanks are formed with two opposing flat sides 54, and between them are arranged folded side pieces 46. Furthermore, bottom pieces 56 are provided between the flat sides 54.
In the illustrated embodiment, a zip closure 58 is provided, a first zip closure portion 60 being provided on one flat side, and a second zip closure portion 62 being provided on the opposite flat side of the bag blank. In this embodiment, the zipper lid 58 is shown in a position immediately below the bag mouth edges so that the bag is opened over its entire width.
FIG. 3 shows a section of a bag web similar to the bag web shown in FIG. 2. In this bag web, however, the zipper lid 58 'is located in one of the flat sides 54 of the bag item 12. Directly adjacent to the zipper lid 58' is provided a perforation 64 which defines an access opening to the bag. This access opening will thus be provided in the flat side 54.
The bag blanks 12 have side edges formed by folded side pieces 46. This applies to the bag blanks shown in Figures 2 and 3. The side pieces 46 are attached to the flat sides 54 via welds 66. As can be seen in the figures, the side pieces 46 are provided with a folding along a line 68.
The bottom pieces 56 may be provided as separate foil pieces or may be provided by bending the edge regions of one of the foil webs used to make the flat sides 54 in the bag blanks.
FIG. 4 and 5 illustrate the various steps of preparing the bag web 4 illustrated in FIG. 1. FIG. 4 is a partial sectional view of that of FIG. 5. In FIG. 4 and 5, a first foil web 70 'is overlaid with a second foil web 70. The first foil web 70' is provided with folded portions which will constitute folded side pieces 46 in a finished bag. Thus, these folded portions 46 will be positioned between the two foil webs so that they will be placed in a bag blank between a front and back of a bag blank.
The first foil web 70 'is unrolled from a supply roll 96 which is rotated in the direction of arrow 98. The foil web 70' is guided around a roller pair 100, between which is located a roller 102 which can be moved up and down as indicated by arrow 104. This ensures tightening in the film web 70 '. A first roller pair 106 is located in front of a roller knife 108 and a second roller pair 110 is located below the roller knife 108. The two roller pairs 106,110 are intended to project the film web 70 '. As a fold occurs at the action of the roller blade between the two roller pairs, they will operate at different feed rates. Thus, the roller pair 110 will run at a rate corresponding to the feed rate of the finished bag after folds are formed which form the folded side pieces of the finished bag item. The roller pair 106 runs at a faster speed so that at a given time they can advance a length corresponding to the bag width as well as the length of the folded side pieces.
In the first foil web 70 ', the folding knife 108 is displaced between two supporting plates 112. The folding knife cooperates with abutment against a retaining plate 114 to form a first folding 115 at a first fold line at the edge of the folding knife 108. indicated by the arrows 116 to clamp the first foil web 70 'between the retaining plate 114 and the rim of the folding knife 118.
A more detailed explanation of the folding will be explained later.
After forming the folds, the second foil web 70 will be passed down and superimposed on the first foil web 70 '. The superposed foil webs are then passed through a welding station 120, thereby forming a transverse weld 66 as well as any further welds in the longitudinal direction of the bag web.
In FIG. 4, a situation of folding is seen in the first foil web 70 ', that is according to the position of the folding knife 108. Each fold will have a width 122. This width depends on the desired size of the bag and may be, for example, between 25 and 75 mm, preferably between 45 and 55 mm. Between two subsequent folds 46 there is a distance 124. This distance can be between 25 and 75 mm and preferably between 45 and 55 mm.
The above goals will depend on the desire for bag size.
The two support plates 112 shown in FIG. 5, functions so that the support plate shown to the right will be a fixed positioned support plate. The support plate 112 shown on the left may be movable. Alternatively, a vacuum brake 126 may be used which retains the film web when the folding is to be formed. The support plate 112, which is on the left side, will also have an edge area used to form a second fold line located between the folded portion and the first foil web 70 '.
FIG. 6-8 show various steps of forming and fixing the fold.
FIG. 6 shows how the retaining plate 114 is provided with needles 128. The needles 128 can be moved through openings in the retaining plate and engage the first foil web 70 '. Thereby, there is a particular security for the proper formation of a folding line, as it is not only formed by clamping between the folding knife 108 and the retaining plate 114.
The needles 128 may be advanced and retracted from engagement with the film web 70 '.
After the folding is formed, the retaining plate and folding knife 108 are moved to the lower position shown in FIG. 7, the heating mandrel 130 will pass through openings in the retaining plate and engage the folded parts so that the folds are fixed with spot welds. When a hot fixing of the folds has been made, the support plates 112 can be swung out of their engagement or displaced out of contact with the fold by a translational movement in the transverse direction of the film web.
Thereafter, the first foil web 70 'with the folds fixed thereon is ready for further feeding. In the further advance, an upper band 132 may be used, as indicated in FIG. However, such an overband can also be avoided. The topsheet 132 may be a vacuum band which draws the first foil web 70 '. Alternatively, the second foil web 70 may be advanced at the front of the top band 132 so that the two foil webs are brought together along the underside of the top band.
Before giving a more detailed description of the manner in which the folds for forming the folded side pieces are formed, with reference to Figures 9-16, a more detailed explanation of the manner in which the bag bottom is formed in the case of a standing bag will be given. . It is noted that Figures 9-16 thus describe a bag having a stand. Alternatively, instead of the use of a folded bottom piece, a longitudinal weld along the longitudinal side edge of the two foil webs 70, 70 'can be used, so that a bag is formed in which only the side edges are folded.
As shown in FIG. 9, the first foil web 70 'has a greater width than the second foil web 70. Thus, there is an edge area 76 of the foil 70' extending beyond the outer edge of the foil web 70.
FIG. 9 illustrates a situation where the two film webs 70.70 'are joined together. Thus, the second foil web 70 is brought down towards the first foil web 70 'with the folded / folded side edges spot welded in a position between the two foil webs 70,70', a spot welding as described in connection with FIG. 7. In addition, a cross-weld 66, as discussed in connection with FIG. 5 so that the bag blank along folds appears with welds which strengthen the bag. In this step, the folded side edges are thus welded to the foil webs 70,70 'at the portions constituting the corners of the bag between the flat sides and the folded bag sides. FIG. 9 shows that the welds 66 extend over part of the length of the folded side pieces 46.
Generally, the foil webs 70, 70 'will be made slightly wider than illustrated at the side where the bag blanket is to be formed. Such extra width at the edge of the foil webs is in practice important to have sufficient foil to intervene in the folding of the foil webs.
FIG. 10 shows a starting fold for forming a stand. An edge area 78 of the first foil web 70 'is folded around a fold line 80 upwardly according to arrow 82. As can be seen, the folded side pieces 46 will thereby be opened.
FIG. Figure 11 shows a subsequent step in which the foil web 70 'is folded back 180 degrees so that the rim area 78 is located on top of the remaining portion of the foil web 70'. This means that the folded side piece 46 is now fully opened and appears flat.
In FIG. 12, a subsequent step is seen in which the rim area 76 of the second foil web 70 is folded around the fold line 84 by folding according to the arrow 86. The fold line 84 is defined as the outermost point of the side pieces 46. The edge area 76 is folded over the side pieces 46 and the first foil path 70 '.
FIG. 13 shows the fully folded position, where the edge region 76 is folded 180 degrees over the other foil elements. It will be seen that the edge region 76 covers the two unfolded and open side pieces 46.
FIG. 14 illustrates a subsequent step in which a transverse weld 88 occurs over the entire length of the side pieces. The side pieces 46 are in the portion 90 which will subsequently form part of the floor base in a bag.
FIG. 15 shows that the second foil web 70 is now welded to the side pieces 46 and the first foil web 70 'and then folded back 180 degrees across the line 80.
FIG. 16 illustrates a final step in which the film webs 70, 70 'are provided with longitudinal welds 92 which will form edges of the stand in a finished bag.
According to FIG. 16, it is preferred that the bottom foil be cut clean. Hereby, the extra width of the film webs 70,70 'mentioned in connection with FIG. 9 and which have been used to intervene in the folding of the film webs.
With the steps described above, a bag web with continuous bag blanks 12 will now be formed. The bag blanks 12 may be separated by slits along the line 94 so that they appear in a shape similar to that of FIG. 1, where the bag blanks 12 at their upper edge (not illustrated in Figures 6-16) are connected to the edge strip regions 50.
The bag web may be stored on roll or by zig-zag folding in boxes.
Figures 6-16 do not show how a zipper closure is inserted into the process. However, as illustrated in FIG. 2 be inserted onto the foil webs immediately prior to the joining of the foil webs illustrated in FIG. 4 and 5. Zipper closure 58 ', shown in FIG. 3, the foil webs will also be inserted immediately prior to the joining of the foil webs illustrated in FIG. 4 and 5.
In connection with Figures 6-16, a specific embodiment of a method for forming the bag blanks is illustrated. In this embodiment, the edge area 76 of the foil web 70 is used to form the bottom of the bag blank.
Alternatively, the bottom may be formed of film pieces which are inserted separately.
Thus, in the manufacture of the film web it is possible to use the manufacturing methods explained in EP 1 250 999. It should be noted, however, that with the technique described in EP 1 250 999 film webs which can be used at their upper side has an edge region which can be used to form the edge strip regions with the star-shaped perforations.
FIG. 17 shows in detail of folds at folded side pieces, using a folding knife 108 which cooperates with a retaining plate 114.
At step A, the two roll pairs 106 and 110 are not propelled (see Figure 18). The first foil web 70 'is in a position below the support plates 112 and with the folding knife 108 located below the foil web.
Step B shows an initial folding, with the folding knife 108 and the retaining plate 114 moving upward, while retaining the needle 128 in a position above the retaining plate 114. In this situation, the roller pair 110 is held, while the roller pair 106 establishes a feed 153 of the foil web.
In step C, the folding knife 108 is in its fully extended position and the needle 128 is brought down to engage the foil web 70 '. Here, a first folding 134 will be formed along a first folding line 136 at the edge of the folding knife 108.1 In this position, the foil web is not advancing as both roll pairs are stationary.
In step D, the folding knife 108 and the retaining plate 112 are displaced downwardly, the needle 128 retaining its engagement and ensuring that the film web does not slip. As can be seen, an initial outward arc of the folded portion of the film web is established. In this position, the folded portion will fold down toward the first foil web 70 'about a second fold line 140. The second fold line 140 will be formed at the edges of the two support plates 112. At the same time, folding will occur around third fold lines 142 of the portions. located on each side of the folding knife 108.
In step E, the folding knife 108 and the retaining plate 114 are moved to the lower position, where folds have now been formed by folding around the two support plates 112. The foil web is still held without movement. In this position, the needle 128 is retracted.
In step F, folding knife and retaining plate are omitted. In step F, spot welding is performed by means of the heat detectors shown in FIG. 7. The spot welds are indicated by 144. The spot welds will be made through the folded portions in the immediate vicinity of the other fold lines 140. By fixing the folds, the foil will be able to retain the feature established in the foil 1 as it is advanced by the roll pair 110 for subsequent to be overlaid with the second film web 70, as illustrated in FIG. 5th
Step G shows the first foil web when a full weld 146 is made along the other fold lines 140. Step G can optionally be performed before or after joining the two foil webs.
FIG. 18 shows a partial view of a further embodiment of the invention. In FIG. 18, a single folding knife 108 is also used to form a fold. The folding knife cooperates with an upper band 132 formed by a plurality of parallel belts 148.1 of the embodiment shown, the second foil web is brought down below the upper band so that it is brought into contact with the first foil web already when it is displaced upwards against the upper band 132.
The upper band 132 thus functions in the same manner as the retaining plate 114 when pivoting up and down around a pivot axis 152 and securing a first foil web 70 between the folding knife 108 and the upper band 132's straps 148.
Spot welding along the fold lines is established with the heat detectors 130 in the same manner as explained in connection with FIG. 17th
In this embodiment, vacuum boxes 126 are used which cooperate with support plates 112 (not shown in Fig. 18).
With this embodiment, a faster speed can be established, with the establishment of folding being done simultaneously with the overlaying of the two foil webs.
After the two foil webs are superimposed and welding is established, the two superimposed foil webs with the folding provided therebetween pass through the welding station 120. At the welding station 120 a welding is established along the other bending lines, as explained in connection with FIG. 17. At the same time, a weld is established between the second foil and the edge region of the folded portions adjacent to the first fold line.
In this way, welds will be formed along the fold lines which subsequently form corners in the bag. It gives the bag a strength.
FIG. 19 shows principle sketches of steps of the method shown in FIG. 18, illustrating how the upper band 132 interacts with the folding knife 108.
In step A, the initial situation is seen where the folding knife 108 is in its lower position under the first foil web 70 '. The top band 132 is pivoted to a position where it lies parallel to the film web 70 'and the underlying portion of the film web 70 which is passed around the top band 132.
Step B shows an initial folding, with the folding knife 108 and the upper band 132 making an upward oscillation 115. In this situation, the roll pair 110 is held, while the roll pair 106 establishes a feed 153 of the foil web. This corresponds to step B of Figure 17.
In step C, the fully extended position of the folding knife 108 is seen while the upper band is in its fully flared position. In this situation, there is no movement or advance of any of the roller pairs, nor is there any advance of the second film web 70.
In this position, the first foil web 70 'is retained along the rim area 134. This creates a fold line 136. As can be seen in step D, there is now a starting fold at the downward oscillation 150 of the upper band 132. In this position, a certain pull occurs in the second film web while holding the first film web 70 '.
In step E, the downward oscillation of the upper band is completed and in this position the heating towers are activated so that a spot weld is formed along the other fold lines, as explained in connection with FIG. 17th
Step F shows finished folding after leaving the position under the upper band. In this position, transverse welds 146 are formed in the welding station 120 shown in FIG. 18. Thus, transverse welds are established at the edge regions which subsequently form corners in the bag. Thus, a bag with strong corners is established in a similar manner, as explained in connection with FIG. 17th
FIG. 20 is a schematic diagram similar to FIG. 19. However, in this embodiment, two folding knives 108 are used which are spaced apart between three support plates 112. The folding knives also cooperate in this embodiment with the upper band 132.
In step A, the starting position is seen with the folding knives retracted.
In step B we see how the folding knives 108 are advanced so as to form folds corresponding to the third folds 142 at the edge regions of the folding knives 138. At the same time, other folds are formed at the folding lines 140 at the edges of the support plates 112.
In step C, we see how the folded portions are pivoted downwardly against the first foil web 70 'as indicated by arrows 154. In the pivoting, the folding knives are retracted from their position within the folded portions.
Thus, in step D, the folding will be formed with a shape similar to that illustrated in step F of FIG. 17. The folding is then brought into contact with the second foil web 70, the top band 132 making a downwardly oscillating 50, so that the folding is clamped between the first foil web 70 'and the second foil web 70. Thereafter, the heat dome 130 is activated. in step F, where the heating towers 130 are contacted with the foil webs at intervals between the upper belt straps. Hereby, in accordance with the above-described spot welding, position is established at the second fold lines between the folded parts and the first foil web 70 'and in the region between a position for a first fold line and the second foil web 70.
In step G we see how the upper band 132 is pivoted to its upper position and the folded portions are advanced outside the first roller pair, where as seen the station 120 is provided. Welding station 120 forms longitudinal welds, as explained earlier in connection with FIG. 17th
FIG. 21 shows a first foil web 70 'of the type provided with an edge area pierced by a series of perforation holes 18. This is seen in the lower figure, where the foil web 70' is formed with a fold to form the folded side pieces, as already explained above. In the lower part of FIG. 21, a dashed line 155 illustrates a line of symmetry through the fold. In the upper part is seen a foil sheet before perforation and folding has been done. It will be seen here that along the one edge region, which subsequently constitutes the edge area of the bag web, a recess 156. The recess is arranged with an extension equally far on each side of the line of symmetry 154. Thus, upon forming the fold, the side edges 158 of the recess are provided in immediate extension of one another.
With such a configuration, it is possible to use the method according to the invention to form bag blanks which can be used in a feed and in a filling apparatus explained in connection with FIG. 1-3. Thus, no excess material will occur in the peripheral areas 40 which prevent proper engagement between the perforation holes 18 and retaining pins 28 in the apparatus.
FIG. 22 shows an enlarged view of the area of the folds. Furthermore, it is seen how the folds are formed in the first foil web 70 'and then joined with the second foil web 70. The folds forming the folded side pieces 46 are shown in enlarged form. It is seen that spot welds 160 are provided at the fold lines 140. Furthermore, it is seen that also at these other fold lines 140, weld 146 is formed in a position between the first foil web 70 'and the adjacent folded portion which is on the second similarly, welds 146 are formed between the second film web 70 and edge areas on each side of what would have constituted a first fold line 136. The welds are established by welding through all the film layers in heating zones indicated by 162. The two foil webs are formed of multilayer polymeric films, with a first layer 162 being weldable and a second layer 164 not being weldable. Thus, only welds occur between the weldable parts / surfaces.
After the two foil webs have been welded together, a cut will be made to form the slots 10 shown in FIG. 1. Thus, an intersection will be established along a cutting line 166. Thereby, from the contiguous foil webs 70,70 'a bag web 4 will be formed.

权利要求:
Claims (19)
[1]
A bag web having a continuous web of laterally folded bag items formed by a first and second superposed foil web forming opposite front and back sides of a bag item, characterized in that folded portions of the first foil web are positioned between the front and back of the bag item. back side for forming at least one first folded side of the bag blank, said first folded side formed of material from the first foil web.
[2]
The bag web according to claim 1, characterized in that the folded portions of the first foil web also form a second folded side in the bag item.
[3]
The bag web according to claim 1, characterized in that the two superposed foil webs have the same width and that the folded parts extend over the entire width or part of the foil webs.
[4]
The bag web according to claim 1 or 2, characterized in that the folded parts are adhered to the first foil web, from which the folded parts are unfolded by spot welds along fold lines between the folded part and the first foil web.
[5]
The bag web according to any one of the preceding claims, characterized in that the superposed bag webs are made of multilayer foils, wherein at least one outer layer of the first and second facing film webs is made of a weldable plastic material. , preferably PE or PP, and that at least one outer layer of the first and second facing webs facing away from each other is made of a non-weldable plastic material, preferably PET, OPA or OPP.
[6]
Bag according to any one of the preceding claims, characterized in that a zipper closure is provided on the first or second foil web, which zipper closure comprises cooperating zipper portions and that a weakening line or parallel is provided in connection with the zipper closure. perforation, which can be easily torn to establish an entrance opening to the interior of a finished bag, which access opening can be opened and closed by means of the zipper closure.
[7]
The bag web according to any one of the preceding claims, characterized in that the bag web along its mouth edges comprises edge strip areas which are prepared with a series of holes or corresponding star perforations intended to be guided with guide means adapted for retaining and fabricating border areas at the opposing bag mouth edges along a conveying path through a filling station, said bag web being of the type consisting of a continuous series of bag items separated by a plurality of slits extending from a bottom edge of the web up to a piece below a top edge of the track.
[8]
Bag web according to claim 7, characterized in that the folded parts extend over part of the width of the foil webs and that material located in the edge area of the bag webs outside the folded parts and at the bag mouth edges is removed over a distance in the length of the foil webs. corresponding to the length of the foil web used to form the folded portions such that the edge region appears substantially unbroken and without folding.
[9]
A method of producing a bag web having a continuous web of side-folded bag items formed by a first and a second superposed foil web forming opposite front and back sides of a bag item and wherein folded portions of the first foil web are positioned between the front and back sides of the bag blank for forming folded sides in the bag blank, characterized in that the method comprises steps wherein: A - a first and a second superposed foil web are advanced from a foil web layer. B - a portion of the first foil web is folded, at least one folding knife being displaced in a direction across the feed direction of the first foil web towards the second foil web, thereby establishing a first fold along a first fold line at the edge of the folding knife, C - folding the folded portion down towards the first foil web about a second fold line between the folded portion and the first foil web, D - fixing the folded portion in its position against the first foil web, E - placement of the second foil web in an overlaid position above the first foil web, F - welding of the two superposed foil webs with transverse welds at the folded portions so that the folded portions are placed in bag blankets between the front and back thereof, G - welding the two superposed foil webs at least along a longitudinal side edge at a bottom of the bag blanks.
[10]
Method according to claim 9, characterized in that - step C comprises displacing the folded part against the first foil web so that half of the folded part on each side of the first fold line is folded to each side around each of the other two fold lines between the folded portion and the first foil web, thereby folding about third fold lines of each half of the folded portion.
[11]
Method according to claim 9, characterized in that - step B comprises folding two parallel folding knives, which are both displaced in a direction transversely of the direction of feeding of the first foil web towards the second foil web, thereby establishing two parallel first folds, and step C comprises folding the folded portions to each side about the other fold lines between the folded portion and the first foil web.
[12]
A method according to any one of claims 9-11, characterized in that the method comprises selecting foil webs made of multilayer foil, wherein at least one outer layer of the first and second foil web facing each other is made of a weldable plastic material, preferably PE or PP, and wherein at least one outer layer of the first and second facing webs facing away from each other is made of a non-weldable plastic material, preferably PET, OPA or OPP.
[13]
A method according to any one of claims 9 to 12, characterized in that - step B comprises holding the first fold along the first fold line at the edge of the folding knife by clamping the foil web between the edge of the folding knife and a retaining means.
[14]
Method according to any one of claims 9 - 13, characterized in that - step B comprises using a pivotable or displaceable resistor, so that the first folding along the first folding line at the edge of the folding knife is retained from the initial formation of the folding as well as during the subsequent step C.
[15]
A method according to claim 13 or 14, characterized in that - step D comprises fixing the folded part by means of welding means arranged in the head restraint.
[16]
A method according to any one of claims 9 to 15, characterized in that - step A comprises the first and optionally also a second superposed foil web being fed from a foil web layer using a first set of rollers in front of the folding step and a second set rolls after the folding step, which rolls clamp about the associated foil web and are used for the foil web advance, the first and second pairs of rolls having differentiated rotation during the folding step.
[17]
Method according to claim 16, characterized in that - step F is performed at one position after the second set of rollers.
[18]
A method according to any one of claims 9 - 17, characterized in that the method comprises a further step H, in which between subsequent bag blanks a transverse cut extending from a bottom edge of the film webs up to a distance below a top edge of the web for forming a continuous row of bagpieces separated by a plurality of up slots.
[19]
Method according to any one of claims 9 to 18, characterized in that the bag web along its mouth edges comprises edge strip areas prepared with a series of holes or corresponding star perforations intended to be guided with guide means arranged for retaining and guiding peripheral areas at the opposing bag mouth edges along a transport path through a filling station.

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同族专利:

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法律状态:

优先权:

申请号 | 申请日 | 专利标题

DKPA201570194A|DK178614B1|2015-04-01|2015-04-01|Bag run and method of making such bag run|DKPA201570194A| DK178614B1|2015-04-01|2015-04-01|Bag run and method of making such bag run|

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PCT/DK2016/050094| WO2016155748A1|2015-04-01|2016-04-01|Bag web and method for making such a bag web|

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