• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    In a fabric (1) for the production of bags consisting of polymer, in particular polyolefin, polypropylene, polyethylene (HDPE) or polyethylene terephthalate, which are preferably monoaxially stretched, wherein the fabric is provided with a coating, the coating of a polymer fleece, in particular polyolefin or polypropylene fleece (3) formed.
    公开号:AT512806A1
    申请号:T492/2012
    申请日:2012-04-23
    公开日:2013-11-15
    发明作者:
    申请人:Bsw Machinery Handels Gmbh；
    IPC主号:
    专利说明:

    The invention relates to a fabric for the production of bags consisting of polymer, in particular polyolefin, polypropylene, polyethylene (HDPE) or
    Polyethylenterephthalatbändchen, which are preferably monoaxially stretched, wherein the fabric is provided with a coating.
    The invention further relates to a sack of such a fabric.
    The tubular body of a valve bag is usually formed from a tube-like round material or a flat material connected to a tube at the longitudinal edges. A rough classification of such bags is made by the distinction in pillow and box shape. A pillow form of sacks usually arises by assembling the floors with a textile seam or a weld. In the box shape, at least one end has a bottom fold so that the bag has a substantially rectangular bottom. The present invention relates equally to the pillow shape and box shape.
    The fabric consists preferably of monoaxially stretched polymer, in particular polyolefin or polypropylene tapes. These tapes are prepared by stretching polymer, in particular polyolefin or polypropylene films usually four to ten times, whereby the molecular chains are aligned in the tape longitudinal direction and have in these directions about six to ten times the strength of the original film. The ribbon width is usually about 1.5 to 10 mm, the
    Thickness 20 to 80 μκι. To achieve dust and moistureproofness, the fabric on one or two sides usually has a coating of melt of preferably the same material from which the tapes are made.
    Valve bags are characterized in that in the bottom of the bag, a valve formed from the fabric material is integrated, via which the bag closed on both sides can be filled with filling material. The filling takes place in that a pipe socket-shaped mouthpiece of a bottling plant is introduced into the valve. The valve is spread open, so that the contents can be placed in the valve bag. If the predetermined filling amount is filled in the bag, this is deducted from the pipe socket-shaped mouthpiece of the bottling plant. In this case, the valve should close by the hose wall portions of the valve tube together, which is realized in that the valve tube is compressed by the pressure exerted by the filling material. During the filling process a venting of the bag interior is required. For paper sacks, this venting takes place over the entire surface of the bag, since paper usually has a certain air permeability. At the same time paper is dust-proof even without coating. The big disadvantage of paper sacks, however, is their limited stability, in particular tear resistance. Sacks of a coated fabric of monoaxially stretched polymer, in particular polyolefin or polypropylene tapes, however, are extremely tear-resistant and stable. However, in such bags, there is one ft ft ft. Ft. "Ft" ft * ft. * Ft. * Ft. * Ft * ft ·············································································································································································································· While it is attempted to measure the number and diameter of the perforations so that the required ventilation performance is achieved and the Staubrückhaltefähigkeit is not simultaneously deteriorated excessively; however, the result always represents a compromise between the two conflicting requirements of venting performance and dust retention capability.
    The present invention therefore aims to develop a fabric of the type mentioned in such a way that the dust retention capability is improved while maintaining a sufficient ventilation performance.
    Another problem with fabrics of the type mentioned is their weldability. Thus, for example, it has become customary to close the bottom fold of a box-shaped bag by welding a cover sheet made of fabric of monoaxially stretched polymer, in particular polyolefin, preferably polypropylene tapes. This is done in some embodiments using an intermediate layer of thermoplastic, especially polyolefin, preferably polypropylene material (see, for example, WO 95/30598 A1). A disadvantage of welding, however, is that the inevitable during welding heat input leads to a disorientation of the oriented by the monoaxial stretching molecules of plastic tapes. Regions of the tissue with disoriented molecules have a much lower strength compared to regions with oriented molecules, so that in the area of the weld the risk is increased 44 * # 4 44 ·· I * • 4 * V «· * 4 ·» 4 * • * » 44 4 # 44 4 4 4 4 · 44 · «4 4 * 44414 4 4 4 * 4 44 ^ 4 4 4 44 * 4 4 * 44 4 * there is a tearing of the fabric. A disorientation can be prevented at most by a sufficiently thick coating of the tissue. But this has a relatively high weight of the bag and higher costs result.
    The present invention therefore further aims to develop a fabric of the type mentioned above such that the weldability is improved without increasing the basis weight of the fabric and without the risk of disorienting the molecules of the material.
    To solve these objects, the invention provides for a fabric of monoaxially stretched polymer, in particular polyolefin or polypropylene tapes, which is provided with a coating, before that the coating of a polymer fleece, in particular polyolefin or polypropylene fleece is formed. A polymer fleece here is to be understood as meaning a textile fabric made of individual polymer fibers. In particular, it is a random fiber nonwoven fabric in which the individual polymer fibers are laid unoriented, i. the fibers are confused in the nonwoven fabric. In particular, the fleece is formed as a spunbonded fabric. The fleece has the advantage that it largely prevents the passage of dust without significantly affecting the ventilation performance. In particular, if, as corresponds to a preferred development, the fabric together with the coating has a multiplicity of perforations, the individual fibers of the nonwoven fabric act on the surface in the region of the perforations like a filter which stops the dust particles. The dust particles entrained in the course of venting with the air flow become entangled with the air. [99] 9 * 99 * «* * ·« I ι «9 9 * 4 *« (II 9 * t »• · *« * «··« ft Thus, it becomes possible to make the perforations larger and to provide for the same ventilation performance in a smaller number, In this context, a preferred embodiment provides that the fabric has 10 - 60, in particular 20 - 50 perforations per cm 2 The diameter of the perforations is at least 0.05 mm, preferably at least 0.1 mm.
    Another advantage of the nonwoven fabric is that it contributes more than the conventional coating to increase the strength of the fabric, so that the fabric can be made with a lower basis weight with the same overall strength. Since the nonwoven fabric is available at a lower cost than the fabric, thereby a cost saving is achieved.
    Another effect is that the non-oriented fibers of the nonwoven are fixed in place by the composite with the fabric, which leads to an increase in the strength of the coated fabric.
    On the nonwoven side, the composite material according to the invention can be welded very well to a similar material without markedly reducing the strength of the material. The reason for this is that the fiber molecules of the nonwoven fabric are stretched only to a small degree, so that the disorientation of the molecules caused by the heat input does not have much influence on the strength of the nonwoven fabric. The orientation of the stretched ribbon of the fabric remains unaffected. • ·
    • Φ 6 ΦΦ Φ
    A particularly advantageous embodiment of the invention provides that the polymer fleece, in particular polypropylene fleece is applied over the entire surface of the fabric. Alternatively, it is also possible that the polymer fleece, in particular polypropylene fleece is only partially applied to the fabric, i. only in certain places, in a tubular fabric e.g. only on a part of the circumference, in particular on half of the circumference.
    Preferably, it is further provided that the polymer fleece, in particular polypropylene fleece is applied to the tissue by means of an intermediate layer. This ensures a secure and stable bond between the fabric and the fleece. The intermediate layer can consist of the same polymer as the fabric and the polymer fleece. In a particularly simple manner, the procedure is such that the intermediate layer is applied by means of extrusion lamination.
    If the fabric according to the invention is coated with a nonwoven fabric, the fabric can, as already mentioned, be made with a lower basis weight without impairing the strength of the composite material. Preferably, it is provided that the fabric has a basis weight of 40-60 gr / m2, the intermediate layer has a basis weight of 10-20 gr / m2 and the polymer fleece has a basis weight of 20-40 gr / m2. According to a particularly advantageous embodiment, the fabric has a basis weight of 50 g / m 2, the intermediate layer has a basis weight of 15 g / m 2 and the polymer nonwoven has a weight per unit area of 25-30 g / m 2. Φ Φ Φ Μ «« Φ Φ Φ Φ ♦ · Φ Φ Φ Φ Φ Φ Φ I Φ Φ ΦΦ «Φ Φ 4 4 4 4 4 9 Φ Φ «Μ ΦΦ · ΦΦΦΦ ΦΦΦΦ ΦΦ
    With regard to the ratio of the surface masses of the individual layers to one another, it has been found that an embodiment in which the fabric has a surface-related mass which corresponds to 1.5-2.5 times the basis weight of the polymer fleece has been preferred.
    The coated fabric according to the invention can be used for the production of sacks for the transport of in particular pulverulent contents. However, other uses are conceivable, e.g. for the production of tarpaulins, covers, etc.
    When used in a bag, the polymer web is preferably arranged on the outside of the bag. In particular, this is a bag with box shape, wherein at least one end portion of the bag body has a bottom fold, so that the bag has a substantially rectangular bottom. In particular, it is a box valve bag whose bottom has a valve formed in particular from the bottom fabric material, so that the sack already closed by the manufacturer can be filled via the valve in conventional filling systems.
    The invention will be explained in more detail with reference to an embodiment schematically illustrated in the drawing. In the figure, the layer structure of the coated fabric according to the invention is shown. The structure comprises a fabric 1 of monoaxially stretched polypropylene tapes, wherein the basis weight of the fabric is 50 gr / m2. The intermediate layer 2 consists of. *. *. *. *. *. *. *. *. *. * *. *. * * *. *% ♦ · · · + · «· · · ♦ ··· * φ # f 8 ··· «·« · · · ♦ φφ φ ΦΦ ·· φφφφ φφ
    Polypropylene and can be applied to the fabric by extrusion lamination. The coating of the fabric web is preferably carried out as described in WO 2011/094783 A1. The basis weight of the intermediate layer is 15 gr / m2. In the not yet solidified state of the intermediate layer, the polypropylene nonwoven fabric 3 is applied to this and bonded to the intermediate layer. The polypropylene fleece has a basis weight of about 25 gr / m2. It can be seen that all three layers are made of polypropylene, so that a sort of pure composite material is created, which can easily be recycled after use.
    In particular, the fleece is formed as a spunbonded fabric. For fiber production, a polymer is heated in an extruder and brought to a high pressure. The polymer is pressed in exact dosage by means of the spinning pumps through a die, the so-called spinneret. The polymer still exits in molten form as a fine filament from the nozzle plate. It is cooled by a stream of air and still stretched out of the melt. The air stream conveys the filaments on a conveyor belt which is designed as a sieve. The threads are fixed by suction under the sieve belt. This fiber fabric is a random nonwoven that must be consolidated. The solidification can be done by two heated rollers (calender) or by a Dampfström. During consolidation by a calender, one of the two rolls is usually provided with an engraving consisting of points, short rectangles or diamond-like points. At the contact points, the filaments merge to form the nonwoven fabric.
    To prepare a bag from the coated fabric, the procedure is as follows. In a first step, either a fabric web (flat fabric) coated on one side with the fleece is taken and formed into a tube, the fleece coming to rest on the outside. Or a tubular uncoated fabric (round fabric) or an uncoated flat fabric shaped into a tube is taken and the intermediate layer is laminated to the tube by extrusion lamination in a conventional coating system (see WO 2011/094783 A1) and the fleece is applied. In a second step, the tubular, coated fabric is perforated. In a third step, the tubular bag body is closed at least on one side. In particular, the bag body is provided for producing a box valve bag at both ends with a bottom fold and welded to the bottom fold a cover sheet. In one of the two bottom folds an existing in particular from the tissue valve is integrated.
    权利要求:
    Claims (15)
    [1]


    «· · · * • ♦ · · *« «# + · · · ♦ · * V

    1. A fabric for the production of sacks consisting of polymer, in particular polyolefin, polypropylene, polyethylene (HDPE) or polyethylene terephthalate tapes, which are preferably monoaxially stretched, the fabric being provided with a coating, characterized the coating (2) is formed by a polymer fleece, in particular polyolefin or polypropylene fleece (3).
    [2]
    2. Fabric according to claim 1, characterized in that the polymer fleece, in particular polypropylene fleece (3) is applied over the entire surface of the fabric.
    [3]
    3. A fabric according to claim 1 or 2, characterized in that the polymer fleece, in particular polypropylene fleece (3) by means of an intermediate layer (2) is applied to the fabric.
    [4]
    4. Fabric according to claim 1, 2 or 3, characterized in that the intermediate layer (2) consists of the same polymer as the fabric and the polymer fleece (3).
    [5]
    5. Fabric according to one of claims 1 to 4, characterized in that the intermediate layer (2) is applied by extrusion lamination.
    [6]
    6. A fabric according to any one of claims 1 to 5, characterized in that the fabric (1) together with the coating has a plurality of perforations.
    [7]
    7. A fabric according to claim 6, characterized in that the fabric (1) has 10-60, in particular 20-50 perforations per cm2 ·
    [8]
    8. A fabric according to claim 6 or 7, characterized in that the diameter of the perforations is at least 0.05 mm, preferably at least 0.1 mm.
    [9]
    9. A fabric according to any one of claims 1 to 8, characterized in that the fabric (1) has a basis weight of 40-60 gr / m2, the intermediate layer (2) a basis weight of 10-20 gr / m2 and the polymer fleece { 3) has a basis weight of 20-40 gr / m2.
    [10]
    10. A fabric according to claim 9, characterized in that the fabric (1) has a basis weight of 50 gr / m2, the intermediate layer (2) has a basis weight of 15 gr / m2 and the polymer fleece (3) has a basis weight of 25 gr / m2. 30 gr / m2.
    [11]
    11. A fabric according to any one of claims 1 to 10, characterized in that the fabric (1) has a surface-related mass, which is 1.5 to 2.5 times the basis weight of the polymer fleece (3).
    [12]
    12. bag comprising or consisting of a coated fabric (1) according to one of claims 1 to 11.
    [13]
    13. Sack according to claim 12, characterized in that the polymer fleece (3) is arranged on the outside of the bag. * Φ φ Φ · Φ ·· 99 99 • Φ ♦ · Φ *

    99 Φ • ♦ 12: Φ φ Φ Φ ····
    [14]
    14. Sack according to claim 12 or 13, characterized in that at least one end region of the bag body has a bottom fold, so that the bag has a substantially rectangular bottom.
    [15]
    15. Sack according to claim 12, 13 or 14, characterized in that the bag is designed as a box valve bag, the bottom of which has formed in particular from the bottom fabric material valve. Vienna, 23 April 2012 Applicant by:

    Guess godfather
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    EP2841262B1|2017-06-14|
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    法律状态:
    2021-12-15| MM01| Lapse because of not paying annual fees|Effective date: 20210423 |
    优先权:
    申请号 | 申请日 | 专利标题
    ATA492/2012A|AT512806B1|2012-04-23|2012-04-23|Fabric for the production of sacks|ATA492/2012A| AT512806B1|2012-04-23|2012-04-23|Fabric for the production of sacks|
    US14/395,712| US20150117801A1|2012-04-23|2013-04-09|Fabric for making bags|
    MX2014012755A| MX345347B|2012-04-23|2013-04-09|Fabric for making bags.|
    PCT/AT2013/000060| WO2013159128A1|2012-04-23|2013-04-09|Fabric for making bags|
    EP13716940.5A| EP2841262B1|2012-04-23|2013-04-09|Fabric for making bags|
    BR112014026402A| BR112014026402A2|2012-04-23|2013-04-09|fabric to make bags|
    CN201380021634.9A| CN104411485B|2012-04-23|2013-04-09|Fabric for manufacturing sack|
    RU2014146948A| RU2625239C2|2012-04-23|2013-04-09|Fabric for bags|
    ZA2014/07656A| ZA201407656B|2012-04-23|2014-10-21|Fabric for making bags|
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