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    • 专利摘要:
    ULTRASONIC CORNER, WELDER PROVIDED WITH THE SAME AND METHOD TO PRODUCE DISPOSABLE DIAPER WITH THE USE OF ULTRASONIC CORNER. It is an ultrasonic horn, whose emission range can be increased significantly. An ultrasonic horn (9) includes an insertion side end section (9a) that has an insertion surface (9c) that receives ultrasonic vibration and an emission side end section (9b) that has an emission surface ( 9e) that emits ultrasonic vibration to a sheet (W). The emission side end section (9b) has a dimension (D3), in the length direction, over which a side edge portion of a frontal abdominal section (20a) and a side edge portion of a posterior dorsal section (20b) can be welded in the longitudinal direction, and it branches in a wide direction that is perpendicular to the long direction by a slit that extends in the long direction. A pair of surfaces (9e) of the emission side end section (9b), positioned on both sides of the slot (9d), serves as the emission surface through which the ultrasonic vibration is emitted.
    公开号:BR112015031468B1
    申请号:R112015031468-6
    申请日:2014-06-13
    公开日:2021-01-26
    发明作者:Yukihiko Fujita；Hideyuki Nakamura
    申请人:Zuiko Corporation；
    IPC主号:
    专利说明:

    TECHNICAL FIELD
    [001] The present invention relates to an ultrasonic horn which is used in ultrasonic welding, a welder provided with an ultrasonic horn and a method for producing a disposable diaper using the ultrasonic horn. BACKGROUND OF THE TECHNIQUE
    [002] Conventionally known disposable diapers include disposable diapers .which include a frontal abdominal section disposed on the user's abdomen, a posterior dorsal section disposed on the user's buttocks and a groin section extending from the frontal abdominal section, passing between the user's legs, up to the posterior dorsal section.
    [003] In this disposable diaper, both the lateral edges of the frontal abdominal section and both lateral edges of the posterior dorsal section are welded together so that the frontal abdominal section and the posterior dorsal section are connected in the form of a ring.
    [004] To produce a disposable diaper of this type, a continuous body is first prepared in which the constituent elements constituted, each, connecting the frontal abdominal section and the posterior dorsal section through the groin section in the longitudinal direction. continuous in a transverse direction.
    [005] The continuous body is then folded in half in the longitudinal direction; in this state, an overlapping portion of the frontal abdominal section and the posterior dorsal section is ultrasonically welded, and the continuous body is cut in the transverse direction so that the resulting weld portions are present on both sides of the groin section.
    [006] An ultrasonic horn that applies ultrasonic vibration to the continuous body that has been folded in half is used in this document for ultrasonic welding (see, for example, Patent Literature 1).
    [007] The continuous body includes a sheet of non-woven fabric, a waterproof sheet and an elastic body, and the thickness dimension of the overlapping portion of the continuous body is large and uneven.
    [008] Consequently, there is a demand for greater amplitudes (henceforth emission amplitude) of the ultrasonic vibration that is emitted by the ultrasonic horn, in order to generate effective thermal energy, through ultrasonic vibration, in such an object to be welded. CITATION LIST PATENT LITERATURE
    [009] Patent Literature 1: Patent No. JP 4592690 SUMMARY OF THE INVENTION
    [010] It is an object of the present invention to provide an ultrasonic horn, the emission amplitude of which can be increased, and to provide a welder provided with the ultrasonic horn and a method for producing a disposable diaper using the ultrasonic horn.
    [011] To solve the above problem, the present invention provides an ultrasonic horn that is used in order to ultrasonically weld an object to be welded, the ultrasonic horn includes: an insertion side end section that has an insertion surface that receives ultrasonic vibration: and an emission side end section that has emission surfaces that are arranged separate from the insertion surface, by a distance corresponding to a half wavelength of the ultrasonic vibration, and through which the ultrasonic vibration is emitted in the object to be welded, in which the end section of the Emission Loop has a dimension, in a direction gives length, on which the object to be welded can be welded in a predetermined direction, and branches in a direction of width that is perpendicular to the length direction by a slit that extends in the length direction, and a pair of end faces from the end section of emission side, positioned on both sides of the slot, works like the surfaces of. issuance.
    [012] The present invention further provides an ultrasonic welder that includes an ultrasonic horn and an ultrasonic vibrator that generates mechanical vibration that is inserted into the ultrasonic horn.
    [013] The present invention also provides a method for producing a disposable diaper using the ultrasonic horn, the disposable diaper has a frontal abdominal section disposed on a user's abdomen, a posterior dorsal section disposed on the user's buttocks and a groin section extending from the frontal abdominal section, passing between the user's legs, up to the posterior dorsal section, in which the method includes; a preparation step to prepare a continuous body in which the constituent elements constituted, each, connecting the frontal abdominal section and the posterior dorsal section through the groin section in a longitudinal direction are continuous in a transverse direction; a half-fold step to fold the continuous body in half in the longitudinal direction; a welding step to simultaneously weld two locations in the continuous body, by inserting ultrasonic vibration on an ultrasonic horn insertion surface, in a state where a pair of emitting surfaces of the ultrasonic horn rests on an overlapping portion on which a portion corresponding to a portion of the lateral border of the frontal abdominal section and a portion corresponding to a portion of the lateral border of the posterior dorsal section overlap, in the continuous body; and a cutting step to cut the continuous body between the two weld sections formed in the welding step.
    [014] The present invention allows to increase the emission amplitude. BRIEF DESCRIPTION OF THE DRAWINGS
    [015] [Figure 1] Figure 1 is a process diagram for explaining a method for producing a disposable diaper in accordance with the present invention;
    [016] [Figure 2] Figure 2 is a side view diagram that illustrates a schematic configuration of a welding device according to a first embodiment for carrying out a welding step and a cutting step illustrated in Figure 1;
    [017] [Figure 3] Figure 3 is a front view diagram that illustrates an enlargement of the welder in Figure 2; [Figure 4] Figure 4 is a side view diagram of an ultrasonic horn illustrated in Figure 3;
    [018] [Figure 5] Figure 5 is a side view diagram illustrating the schematic configuration of a welding device according to a second embodiment of the present invention;
    [019] [Figure 1] Figure 6 is a front view diagram illustrating a welding device according to a third embodiment of the present invention;
    [020] [Figure 7] Figure 7 is a cross-sectional diagram along the VTI-VII line in Figure 6; and
    [021] [Figure 8] Figure 8 is an enlarged view diagram of a welding unit illustrated in Figure 6. DESCRIPTION OF THE MODALITIES
    [022] The modalities of the present invention are described below with reference to the attached Figures. The following modalities are examples that corroborate the present invention and do not limit the scope of the technique of the present invention.
    [023] Referring to Figure 1, a disposable diaper 20 includes, when used, a frontal abdominal section 20a disposed on the user's abdomen, a posterior dorsal section 20b disposed on the user's buttocks and a groin section 20c extending from the frontal abdominal section 20a, passing between the user's legs, up to the posterior dorsal section 20b.
    [024] Both side edge portions of the front abdominal section 20a and both side edge portions of the back dorsal section 20 b are welded together by two weld sections S, so that the front abdominal section 20a and the section posterior dorsal 20b are connected in the form of a ring.
    [025] A method for producing disposable diaper 20 will be explained below. <TRANSPORT STAGE Pl>
    [026] In the transport stage Pl, a sheet W that extends in. a specific direction is carried along the length direction of sheet W. In the following explanation, the flow direction of sheet W will be referred to as the transverse direction, and the direction perpendicular to the transverse direction in Figure 1 will be referred to as the longitudinal direction.
    [027] The W sheet has an inner sheet that faces the user's body surface when the user wears the diaper, an outer sheet that faces away from the user when the user wears the diaper and an elastic member that sits between the inner sheet and the outer sheet.
    [028] The inner sheet consists of a sheet of non-woven fabric and / or a sheet of mesh that has permeability to liquids. The outer sheet consists of a material, identical to that of the inner sheet, a polyethylene film, a polypropylene film or a non-woven fabric that is water repeating and breathable.
    [029] The elastic member consists of a sheet or filament made of polyurethane, natural rubber or a thermoplastic resin. <STEP D. AND P2 LEG HOLE FORMING>
    [030] In the leg hole formation step P2, leg holes L are formed in a central position of the sheet W in the longitudinal direction.
    [031] Each region between the two leg holes L on sheet W is a portion corresponding to groin section 20c. The positions on both sides of each portion on the sheet W corresponding to the groin section 20c, in the longitudinal direction, correspond, in the present document, to the frontal abdominal section 20a and to the posterior dorsal section 20b, respectively.
    [032] That is ,. the transport stage PI and the leg orifice formation stage P2 correspond to the preparation stage to prepare a continuous body (object to be welded) in which the constituent elements' each connect to the frontal abdominal section 20a and the posterior dorsal section 20b through the groin section 20c in the longitudinal direction are continuous in the transverse direction. <BODY UNION STEP. ABSORBENT P3>
    [033] In the step of joining the absorbent body P3, an absorbent body A is joined in 'ama position on the sheet W between the two leg holes f.
    [034] The absorbent body A includes a permeable sheet that has liquid permeability, one. water-repellent sheet which is water-repellent and resistant and an absorbent core between the permeable sheet and the water-repellent sheet.
    [035] The permeable sheet consists of a sheet of non-woven fabric and / or a sheet of mesh that it has. permeability to liquids. The water-repellent sheet consists of a polyethylene film, a polypropylene film or a non-woven fabric, which is water-repellent and breathable. 1036] The absorbent core is shaped by forming layers of kneaded pulp or kneaded pulp mixed with a highly water-absorbing polymer.
    [036] The core-ab3sorbent is mB1daciQ through the formation of sweetened gourd camps. Qü p: sweetly mixed mists with a highly water-absorbing polymer.
    [037] A method is explained in this document in which absorbent body A is attached to sheet W, but the absorbent core can be joined in a state where the absorbent core is between the inner sheet and the outer sheet of sheet W. In this case, the inner sheet consists of a sheet of non-woven fabric and / or a mesh sheet that has liquid permeability. The outer sheet consists of a polyethylene film, a polypropylene film or a non-woven fabric that is water repeating and breathable, <STEP BENDING IN HALF P4>
    [038] In the middle fold step P4, the sheet W (continuous body) that has the absorbent body A placed on it is folded in half in the longitudinal direction. As a result, the portion of the leaf W corresponding to the frontal abdominal section 20a and the portion corresponding to the posterior dorsal section 20b overlap. <P5 WELDING STEP>
    [039] In the P5 welding step, a portion of the folded sheet W corresponding to a side edge portion of the front abdominal section 20a and the portion corresponding to a side edge portion of the back dorsal section 20b are ultrasonically welded.
    [040] Specifically in the P5 welding step, two locations of the W sheet are ultrasonically welded at the same time, with a wider spacing than a predetermined cutting range D2 (eg 10 mm) as a cutting range in the cutting step P6 described below.
    [041] The two weld sections S are formed, respectively, over an entire strip Dl in the longitudinal direction, by a portion corresponding to a portion of the lateral edge of the frontal abdominal section 20a and by a portion corresponding to a portion of the lateral edge of the posterior dorsal section 20b. <P6 CUTTING STEP>
    [042] In the cutting step P6, the sheet W is cut along a respective cutting line that extends, in the longitudinal direction, between two weld sections S formed in the welding step P5. The W (continuous body) sheet is cut as a result in each disposable diaper 20.
    [043] An explanation will be presented below, with reference to Figure 2, about a welding device 1, according to the first modality, which performs the welding step P5 and the cutting step P6.
    [044] The welding device 1 includes an introduction roller 2 which introduces the sheet W that has passed through the folding step in the middle P4 ;: a drum 3 that carries the sheet W introduced by the introduction roller 2; a welder 4 that welds the sheet W between the drum 3 and the welder 4; a rotary cutter 5 that cuts the sheet W between the drum 3 and the rotary cutter 5; and a guide roller 6 that guides the sheet W out of the drum 3.
    [045] Drum 3 can rotate counterclockwise, in Figure 2, around a center of rotation Cl. The drum 3 includes a drum body 3a that it has. an outer peripheral surface to which the sheet W can be sucked and five anvils 3b which are provided in sunken recesses from the outer peripheral surface of the drum body 3a and which sustain, from within, the sheet W which is sucked into the drum body 3a.
    [046] Anvils 3b are arranged at equal intervals around the center of rotation Cl.
    [047] The welder 4 is supplied outside the drum 3 in order to place the sheet W between the welder and the drum 3. The sheet W is ultrasonically welded between the welder 4 and the sequentially opposite anvils 3b in response to the rotation of the drum 3 .
    [048] The configuration of welder 4 will be explained below with reference to Figure 3.
    [049] Welder 4 includes an ultrasonic wave oscillator 12 that generates high frequency electrical energy., An ultrasonic vibrator 7 that converts energy. electrical emitted by the ultrasonic wave oscillator 12 in mechanical vibration and which emits mechanical vibration, um. amplifier 8 which is connected to the ultrasonic vibrator 7 and which amplifies the ultrasonic vibration inserted by the ultrasonic vibrator 7 and an ultrasonic horn 9 connected to the amplifier 8 and which receives the ultrasonic vibration a. from amplifier 8.
    [050] O. amplificado.r 8 has an insertion surface and an emission surface that are separated from each other by a distance corresponding to half the length of the ultrasonic vibration that is inserted by the ultrasonic vibrator 7. The the insert is connected to the ultrasonic vibrator 7, and the emission surface is connected to the ultrasonic horn 9 ..
    [051] With reference to Figure 3 and. Figure 4, the ultrasonic horn 9 includes an insertion side end section 9a that has an insertion surface 9c which receives ultrasonic vibration from the amplifier 8 and an emission side end section 9b that has a pair of surfaces emission 9e which is disposed separate from the insertion surface 9c by a distance corresponding to half the wavelength (1 / 2À) of the ultrasonic vibration which is inserted into the insertion surface 9c and which emits ultrasonic vibration to the sheet W.
    [052] The ultrasonic vibration that is inserted in the ultrasonic horn 9 consists of longitudinal waves in a direction perpendicular to the emission surfaces 9e, but, in the graph of Figure 3, the ultrasonic vibration is depicted as a transverse wave, as a convenience in the explanation.
    [053] The emission side end section 9b has a dimension D3 (direction from left to right in Figure 4) on which the entire strip Dl (see Figure 1), in the longitudinal direction, of the corresponding sheet portion W to a side edge portion of the front abdominal section 20a and the leaf portion W corresponding to a side edge portion of the posterior dorsal section 20b can be welded.
    [054] The emission side end section 9b branches in the wide direction (direction from left to right in Figure 3), perpendicular to the length direction, through a slot 9d that extends in the length direction. That is, the emission surface pair 9e consists of end faces of the emission side end section 9b, divided by the slot 9d. The width dimension of the emission surface pair 9e is, for example, 12 mm.
    [055] In this document, the gap width dimension 9d is defined in a dimension D4 (spacing between emission surfaces 9e: for example, 12 mm), wider than the cutting range D2 (see Figure 1) to cut the W sheet in the transverse direction.
    [056] In the example above, a case has been explained in which the width dimension of the cutting range D2 is 10 mm, and the width dimension D4 of the slit 9d. is 12 mm. The smaller the dimension, the width of the slit 9d, the smaller the spacing of the disposable diaper 20 can be made; consequently, a. the width dimension of the cutting range D.2 can be defined, for example, in 6 mm, and the width dimension D4 of the slot 9d can be defined in 8 mm.
    [057] The width dimension D4 of the slot 9d can be made smaller than the width dimension of the cutting range D2. In this case, however, the weld section is present on the cutting surface, and the end face of the disposable diaper 20 becomes stiff and exhibits an unattractive appearance. Consequently, the width dimension D4 of the slot 9d is preferably defined to be greater than the width dimension of the cutting strip D2, as described above.
    [058] Slit 9d is formed on a strip from a position corresponding to a knot of ultrasonic vibration that is inserted through the insertion surface 9c to the end face (emission surfaces 9e) of the end side section of issue 9b.
    [059] The ultrasonic horn 9 has a shape in order to taper, in the wide direction, towards the. emission surfaces 9e, from a position corresponding to the ultrasonic vibration node that is inserted through the insertion surface 9c.
    [060] The purpose of the pair of through holes 9f that extend in the direction from top to bottom and are arranged separately from each other in the direction from left to right, in Figure 4 ,. It is to adjust the transmission of ultrasonic vibration that is emitted by the emission surfaces 9e in such a way that the ultrasonic vibration becomes homogeneous in the length direction (direction from left to right in Figure 4) of the emission surfaces 9e. The through holes 9f communicate with the slot 9d,
    [061] The rotary cutter 5 has a roller that can rotate about a geometric axis parallel to the center of rotation C1 and a cutting blade provided on the outer peripheral surface of the roller. The sheet W is cut between the cutting blade and each anvil 3b when the cutting blade and the anvil 3b oppose each other in response to the rotation of the roller and drum body 3a.
    [062] With reference to Figure 1 and Figure 3, in a case where the welding step P5 is carried out using the welding device 1, the ultrasonic vibration is inserted into the .surface 9ç of the horn, ultrasonic 9 , in a state where the pair of emission surfaces 9e of the ultrasonic horn 9 rests on the overlap portion in which the portion corresponding to a side edge portion of the front abdominal section 20a and the portion corresponding to a side edge portion of the posterior dorsal section 20b on sheet W overlap.
    [063] As a result, it becomes possible to simultaneously weld two locations on the W sheet between the ultrasonic horn 9 and each anvil 3b (see Figure 2).
    [064] A portion of the sheet W between the two weld sections S thus formed is cut between the rotary cutter 5 and each anvil 3b (cutting step P6).
    [065] As explained above, the slot 9d extending in the length direction is formed in the emission side end section 9b, and the spacing between the pair of emission surfaces 9e positioned on both sides of the slot 9d is defined to be greater than the cut range D2.
    [066] As a result, the emission amplitude can be increased by reducing the mass of the emission side end section 9b by virtue of slit 9d, and it becomes possible to use, as the cutting range D2, the area of non-welding of the sheet W defined by the slot 9d.
    [067] Therefore, the present invention allows to weld, simultaneously and reliably, two locations of the folded portion of the W sheet (welding locations of two adjacent disposable diapers 20),
    [068] The following effects can be obtained according to the above modality.
    [069] In the above embodiment, the emission side end section 9b has a dimension of length D3 over which the side edge portions of the front abdominal section 20a and the side edge portions of the back dorsal section 20b can be welded on the entire strip Dl in the longitudinal direction. Consequently, the emission range can be increased, as described above; eiiqtianto ensures the function of welding the sheet W in the entire range Dl.
    [070] In the modality, the emission amplitude can be reliably increased by reducing the weight of the ultrasonic horn 9 only in the portion of it that is closer to the emission surfaces 9e than the ultrasonic vibration node. [Õ71j In particular., The slot 9d is formed over a strip from the position corresponding to the ultrasonic vibration node to the end face of the emission side end section 9b. The reduction in the weight of the ultrasonic horn by the slot 9d can be maximized as a result.
    [071] Ern particulár, Eenda 9d is. It is formed on a slope from the corpsion of the color5dd_en.Ee to the ultrasonic vibration knot up to the extending face of the emission side extremity section 9b. corned cigj p'esQ reduction: the ultrasonic poF par'té of the 9d female can be maximized as a result.
    [072] A welding device 10 according to a second modality will be explained below with reference to Figure 5. The features identical to those of welding device 1 according to the first modality will be denoted by identical reference symbols, and an explanation of them will be omitted.
    [073] The welding device 10 has a retaining section 11 which can rotate around the center of rotation Cl, together with the drum 3, and which contains b welder 4 in a direction sliding along the center of rotation Cl .
    [074] To avoid contact with the introduction roller 2, the rotary cutter 5 and the handlebar roller 6, the containment section 11 is provided in a position where the containment section 11 avoids the introduction roller 2 of the cutter rotary 5 and handlebar roll 6, in a direction along the center of rotation Cl.
    [075] The welder 4 is contained in the containment section 11 so that the welder 4 slides into welding positions opposite the respective anvils 3b, within an angle range C around the center of rotation Cl, and slides into position of evd-tation in which the welder 4 avoids the introduction roller 2, the rotary cutter. 5 and the handlebar roller 6, within an angle range other than the angle range θ.
    [076] Specifically, the welder 4 is connected to the drum 3, by means of a meat mechanism not shown, so that the welder 4 slides between the welding position and an avoidance position, in response to the rotation of the drum 3.
    [077] Therefore, the welding device 10 allows to use, as a welding period., The period, during which the drum 3 rotates over the angle range Q, and therefore the sheet W can be welded even further. more reliable.
    [078] In a case where the sheet W is cut downstream of the welding device 10 (in which case the rotary cutter 5 is not provided in the drum 3), the anvils 3b can be caused to slide in sync with the sliding of the welder 4, between the welding position and the avoid position.
    [079] The welder 4 can be supplied inside the drum 3, and the anvils 3b outside the drum 3, and at least one of the welder 4 and the anvils 3b can be made to slide.
    [080] A third embodiment of the present invention will be explained below with reference to. Figure 6 and Figure 8.
    [081] In a welding device 30 of the third modality, the ultrasonic horns 9 are supplied inside a rotating drum 35 (side close to the center), and anvils 38 are supplied outside the rotating drum 35 (side away from the center) , so that the anvils 38 can slide in relation to the ultrasonic horns 9.
    [082] The purpose of the welding device 30 is to ultrasonically weld the sheet W which is introduced by means of an introducing roller 50 after being folded in half in the half-fold step P4, and to provide the welded sheet W to the cutting step P6, by means of a handlebar roller 51.
    [083] As shown in Figure 6 and Figure 7, specifically, the welding device 30 includes a drive shaft support member 31, a meat drum 32 attached to the drive shaft support member 31, a track follower meat 33 provided within a cam groove 32a of the meat drum 32, a drive shaft 34 pivotally supported with respect to the drive shaft support member 31 about a rotational axis Ll, the rotating drum 35 is attached to the drive shaft 34, ten welding units 36 attached to the rotating drum 35, and ten power transmission mechanisms 37 for transmitting power from the meat drum 32 and the cam follower 33 to the welding units 36.
    [084] In the explanation below, the direction parallel to the geometric axis of rotation Ll in Figure 6 will be defined as the X direction, the direction from top to bottom in Figure 6 as the Z direction, and the direction perpendicular to the XZ plane as the direction Y.
    [085] The cam drum 32 is attached to the drive axle support member 31 in a state where an end of the cam drum 32, in the X direction, is engaged with a through hole 31a of the axle support member. drive 31, In this state, the geometric axis of the cam drum 32 coincides with the geometric axis of rotation LI.
    [066] The meat groove 32a is formed on the outer peripheral surface of the meat drum 32. The meat groove 32a, which is described in detail below, has a shape that allows the meat follower 33, which rotates about the geometric axis of rotation L.1, moves in the X direction.
    [087] The drive shaft 34 penetrates the cam drum 32 in the X direction, in a state where the drive shaft 34 can rotate in relation to the meat drum 32. Specifically, the drive shaft. 34 is supported, on the drive shaft support member 31 indirectly, by means of the meat drum 32.
    [088] The rotating drum 35 is attached to the front end section of the drive shaft 34, which protrudes out of the meat drum 32. The rotating drum 35 rotates in. around the axis of rotation LI in response to the rotation of the drive shaft 34. The rotating drum 35 is a cylindrical drum that covers the outer peripheral surface of the meat drum 32.
    [089] The ten welding units 36 are fixed to the rotating drum 35. in a state where the welding units 36 are arranged equidistantly (at 36 ° intervals) around the geometric axis of rotation LI. The configurations of the ten welding units 36 are identical, and, consequently, the configuration of only one welding unit 36 will be explained below.
    [090] Each welding unit 36 has the ultrasonic horn 9 and the anvil 38 which press the W sheet and weld the W sheet, and the ultrasonic vibrator 7 which is connected to the ultrasonic horn 9, a horn retaining mechanism 39 which is fixed to the rotating drum 35 and containing the ultrasonic horn 9 and an anvil containment mechanism 40 which is attached to the rotating drum. 35 and containing the anvil 38.
    [091] The anvil 38 is a roller-type member supported in a rotating manner that slides in relation to the ultrasonic horn 9, as described below, so that, as a result, the anvil 38 can come in rolling contact with the sheet W that is supported on the ultrasonic horn 9.
    [092] As shown in Figure B, dole welding patterns 38a are formed on the outer peripheral surface of the anvil 38, in positions opposite the two emission surfaces 9e of the ultrasonic horn 9. The welding patterns 38a are made up of a plurality of protuberances protruding from the outer peripheral surface of the anvil 38 outwardly in the radial direction. The overlapping portion on the sheet W can be welded intermittently by the plurality of protrusions.
    [093] The protrusions extend parallel to each other and obliquely to a direction that is parallel to the geometric axis of rotation of the anvil 38. As a result, the contact pressure (contact surface area) of the anvil 38 with the surfaces emission point 9e (sheet W) is left substantially uniform regardless of the position of rotation of the anvil 38.
    [094] With reference to Figure 7 and Figure 9, the horn containment mechanism 39 contains the ultrasonic horn 9 in a state that the emitting surfaces 9e of the ultrasonic horn 9 face outwards in the radial direction of the rotating drum 35 [Ó95] The anvil containment mechanism 40 contains the anvil 38 so that the anvil 38 can move, in the X direction, in relation to the horn containment mechanism 39 (ultrasonic horn 9). As shown in Figure 7, specifically, each anvil containment mechanism 40 includes a rail 40a that is attached to the rotating drum 35 and extends in the direction of the X-axis and a containment section 40b that is slidably attached to the rail 40a along the direction of the geometric axis X and containing the anvil 3'8. Each power transmission mechanism 37 connects the meat follower 33 and the containment section 40b so that the containment section 40b of the anvil containment mechanism 40 moves in the direction of the geometric axis X in response to the movement of the follower of meat 33.
    [095] Specifically, the power transmission mechanism 37 includes a pair of synchronization pulleys 37a and a synchronization belt 37b that surrounds the synchronization pulleys 37a. The meat follower 33 is attached to one of the two portions, of the timing belt 37b, between the timing pulleys 37a, while the containment section 40b of the anvil containment mechanism 40 is attached to the other of the two portions.
    [096] As a result, the anvil containment mechanism 40 moves, in the X direction, in a direction opposite to the meat follower 33r when the meat follower 33 moves to one side in the X direction.
    [097] The movement range of the anvils 38 is defined by the cam groove 32a as follows.
    [098] Anvils 38 can move over a range of motion between an initial position (position shown at the top of Figure 7) that is separated from the ultrasonic horn 9 towards the meat drum 32 in the X direction, to an intermediate position ( position shown at the bottom of Figure 7) that is separated from the ultrasonic horn 9 towards the opposite side of the meat drum 32 in the X direction, [100] The relationship between the rotation position around the L1 geometric axis of rotation and the position of movement of the anvil 38 is defined, as described below, by the meat groove 32a. [101] As shown in Figure 6, the input roller 50 and the guide roller 51 are arranged between the rotation position RI and the rotation position R7 around the geometric axis of rotation LI. Anvils 38 are arranged in the starting position (position shown at the top of Figure 7), within a range from the rotation position R7 to the rotation position RI. [102] In the range from rotation position R1 to rotation position R2, anvils 38 accelerate from the initial position towards the intermediate position (hereinafter, this orientation will be referred to as forward). In the range from the rotation position R2 to the rotation position R3, the anvils 38 move forward at constant speed. During this movement, the sheet W is welded between the ultrasonic comets 9 and the anvils 38. [103] In the range from the rotation position R3 to the rotation position R4, the anvils 38 decelerate (acceleration is given back to the anvils 38), so that the anvils 38 stop in an intermediate position (position shown at the bottom of Figure 7), in the rotation position R4. In the range from the rotation position R4 to the rotation position R5, the anvils 38 accelerate backwards, from the intermediate position towards the starting position. [104] In the range from rotation position R5 to rotation position R6, anvils 38 move backwards at constant speed. During this movement, the sheet W is welded again between the ultrasonic horns 9 and the anvils 38. [105] In the range from the rotation position, R6 to the rotation position R7, the anvils 38 decelerate, (acceleration is given to in front of the anvils 38), in order to stop in the initial position, in the R7 rotation position. [106] In the above modalities, as shown in Figure 3, the slit. 9d extends from a position corresponding to one. knot of the ultrasonic vibration, towards the end face of the emission side end section. 9b (emission surfaces 9e). If the slot 9d extends towards the end face of the emission side end section 9b from a position that is closer to the emission surfaces 9e than the node, it becomes possible to reduce the ratio of the mass of the ultrasonic horn 9 on the side of the emission surfaces 9e from the node and the mass of the ultrasonic horn 9 on the side of the insertion surface 9c from the node and thus increases the emission amplitude. [107] In the above embodiments, amplifier 8 is provided between the ultrasonic vibrator 7 and the ultrasonic horn 9, but amplifier 8 can be omitted, since the emission amplitude can be increased by virtue of slot 9d, as described above. [108] That is, the ultrasonic vibrator 7 can be connected directly to the insertion surface 9c of the ultrasonic horn 9. [109] The ultrasonic welder can be made more compact as a result. [110] In the above embodiments, the emission side end section 9b has a dimension of length D3 over which the entire strip D1, in the longitudinal direction, of the side edge portions of the front abdominal section 20a and the side edge portions of the back dorsal section 20b can be welded, but the emission sidewall end section 9b can be of a length dimension so that only part of the entire strip D1 is weldable. [111] In the above embodiments, an Ultrasonic horn 9 is explained to weld the continuous body of the disposable diaper 20, but the object to be welded is not limited to being a continuous body of a disposable diaper. [112] The specific modalities described above include an invention that has the following features. [113] Specifically, the presence invention provides an ultrasonic horn that is used in order to ultrasonically weld an object to be welded, the ultrasonic horn includes! an insertion side end section that has an insertion surface that receives ultrasonic vibration; and an emission side end section that has an emission surface that is arranged separate from the insertion surface, by a distance corresponding to a half wavelength of the ultrasonic vibration, and through which the ultrasonic vibration is emitted in the object to be welded, in which the emission side end section has a dimension, in a long direction, over which the object to be welded can be welded in a predetermined direction, and branches in a wide direction that it is perpendicular to the length direction by a slit that extends in the length direction, and a pair of end faces of the emission side end section., positioned on both sides of the slit, functions as the emission surface. [114] As is known, the emission amplitude of an ultrasonic horn generally increases with decreasing the ratio between the mass of the ultrasonic horn in one portion on the emitting surface side and the mass of a portion on the insertion surface side. , with reference to. a knot of the ultrasonic vibration that is inserted, [115] A. the emission side end section that has the emission surface can thus be reduced conceivably in the length direction. However, there are limits to the reduction of the emission side end section in the length direction, since the emission side end section needs to have a longitudinal dimension that allows the welding of the object to be welded, over one. wide area along a predetermined direction. [116] In the present invention, therefore, a slit that extends in the length direction is formed in the emission side end section, and the spacing between the pair of faces: end (emission surface) positioned on both sides of the slit is set to be greater than the cutting range. [117] As a result, the present invention makes it possible to increase the emission amplitude by reducing the mass of the emission side end section through the slit. [118] Preferably, in order to produce a disposable diaper that has a frontal abdominal section arranged on the abdomen of. a user, a posterior dorsal section arranged on the user's buttocks and a groin section extending from the front abdominal section, passing between the user's legs, up to the posterior dorsal section, the ultrasonic horn is used to ultrasonic weld an overlapping portion in which a portion corresponding to a side border portion of the frontal abdominal section and a portion corresponding to a side border portion of the posterior dorsal section overlap, in a state in which a continuous body, in which the constituent elements constituted, each. one, connecting the frontal abdominal section and the posterior dorsal section by means of. groin section in a longitudinal direction are continuous in a transverse direction, it is folded in half in the longitudinal direction, the emission side end section has a dimension, in the length direction, on which the lateral edge portion of the abdominal section front and the lateral edge portion of the posterior dorsal section can be welded along the longitudinal direction, and the pair of end faces of the emission side end section positioned on both sides of the slot is spaced more than a predetermined cutting strip as a strip for cutting the continuous body along a cutting line that extends in the longitudinal direction. [119] This aspect allows to use an area of non-welding of the continuous body, defined by the slot, as the cutting range, while increasing the emission amplitude through a reduction in the mass of the emission side end section through the slit as described above. [120] Therefore, two locations of the overlapping portion of the continuous body (welding locations of the two adjacent disposable diapers) can be welded simultaneously and reliably, so that a disposable diaper can be produced by cutting the continuous body between the weld portions. [121] In the ultrasonic horn, preferably, the emission side end section has a dimension, in the length direction, over which the side edge portion of the frontal abdominal section and the side edge portion of the posterior dorsal section can be welded over an entire strip of the same in the longitudinal direction. [122] This aspect allows to increase the emission amplitude, as described above, while ensuring the welding function of the entire strip, in the longitudinal direction, of the lateral edge portion of the frontal abdominal section and the lateral edge portion of the posterior dorsal section. [123] In the ultrasonic comet, preferably, the crack is formed over a strip that extends from a position corresponding to an ultrasonic vibration node, or from a position that is closer to the emission surface than the position corresponding to the Ultrasonic vibration knot, up to the end faces of the emission side end section. [124] In this respect, the emission amplitude can be reliably increased by reducing the weight of the ultrasonic horn only on the portion of the horn that is closer to the emission surface than the ultrasonic vibration node. [125] In particular, the reduction in weight of the ultrasonic horn achieved by the crack can be maximized in a case where the crack is formed over an area from the position corresponding to the ultrasonic vibration knot to the end face of the end section emission side. [126] The "knot" is a position where the amplitude of the ultrasonic vibration waveform becomes minimal (0). [127] The present invention further provides an ultrasonic welder that includes the ultrasonic horn and an ultrasonic vibrator that generates mechanical vibration that is inserted into the ultrasonic horn. [128] In the ultrasonic welder, preferably, the ultrasonic vibrator is connected directly to an insertion surface of the ultrasonic horn. [129] In the ultrasonic horn, specifically, the emission amplitude can be increased by slit, and consequently it becomes possible to omit an amplifier to amplify the ultrasonic vibration from the ultrasonic vibrator. The ultrasonic welder can be made more compact as a result. This does not mean, however, that the present invention excludes the ability to provide a amplifier between the ultrasonic horn and the ultrasonic vibrator. [130] The present invention also provides a method for producing a diaper d disposable with the use of the ultrasonic horn, the disposable diaper has a frontal abdominal section arranged over a user's abdomen, a posterior dorsal section arranged over the user's buttocks and a groin section that extends from the frontal abdominal section , passing between the user 's legs, up to. posterior dorsal section, in which the method includes: a preparation step to prepare a continuous body in which the constituent elements are constituted, each one, connecting the frontal abdominal section and the posterior dorsal section through the groin section in one direction longitudinal are continuous in a transverse direction; a half-fold step to fold the continuous body in half in the longitudinal direction; a welding step to simultaneously weld two locations in the continuous body, by inserting ultrasonic vibration on an ultrasonic horn insertion surface, in a state where a pair of ultrasonic horn emission surfaces rests on an overlapping portion on which a portion corresponding to a portion of the lateral edge of the frontal abdominal section and a portion corresponding to a portion of the lateral border of the posterior dorsal section overlap, in the continuous body; and a cutting step to cut the continuous body between the two weld sections formed in the welding step. [131] The production method according to the present invention allows to weld a continuous body in a state in which the emission amplitude has been increased by the use of an ultrasonic horn that has a slit and allows to cut a continuous body in an area of non-welding (area between the two weld sections), defined by the slit, of the continuous body. [132] Therefore, the production method according to the present invention allows to weld, simultaneously and reliably., Two locations of the overlapping portion of the continuous body and to cut the continuous body between the welding places, to produce, from that way, a disposable diaper.
    权利要求:
    Claims (6)
    [0001]
    1. Ultrasonic horn (9) which is used in order to ultrasonically weld an object to be welded, in which it comprises: an insertion side end section (9a) that has an insertion surface (9c) that receives ultrasonic vibration; and an emission side end section (9b) having an emission surface (9e) which is disposed separate from the insertion surface (9c), by a distance corresponding to a half wavelength of the ultrasonic vibration, and through of which ultrasonic vibration is emitted in the object to be welded, in which the emission side end section (9b) has a dimension, in a long direction, on which the object to be welded can be welded in one direction predetermined, and branches in a width direction that is perpendicular to the length direction by a slit (9d) extending in the length direction and a pair of end faces of the emission side end section (9b), positioned on both sides of the gap (9d), it functions as the emission surface (9e), characterized by the fact that the gap (9d) is formed over a strip that extends from a position corresponding to an ultrasonic vibration node , to the extr faces emity of the emission side end section (9b).
    [0002]
    2. Ultrasonic welder, characterized by the fact that it comprises: the ultrasonic horn (9), as defined in claim 1; and an ultrasonic vibrator (7) that generates mechanical vibration that is inserted in the ultrasonic horn (9).
    [0003]
    3. Ultrasonic welder, according to claim 2, characterized by the fact that the ultrasonic vibrator (7) is connected directly to an insertion surface (9c) of the ultrasonic horn (9).
    [0004]
    4. Method for producing a disposable diaper (20) using the ultrasonic horn (9), as defined in claim 1, characterized by the fact that the disposable diaper (20) has a frontal abdominal section (20a) arranged on the abdomen of a user, a posterior dorsal section (20b) arranged over the user's buttocks and a groin section (20c) that extends from the frontal abdominal section (20a), passing between the user's legs, to the posterior dorsal section (20b) ), the method comprises: a preparation step to prepare a continuous body in which the constituent elements are constituted, each one, connecting the frontal abdominal section (20a) and the posterior dorsal section (20b) through the groin section ( 20c) in a longitudinal direction are continuous in a transverse direction; a fold in half step to fold the continuous body in the longitudinal direction; a welding step to simultaneously weld two locations on the continuous body, by inserting ultrasonic vibration on an insertion surface (9c) of the ultrasonic horn (9), in a state where a pair of emission surfaces (9e) of the ultrasonic horn (9) rests on an overlapping portion in which a portion corresponding to a side edge portion of the frontal abdominal section (20a) and a portion corresponding to a side edge portion of the posterior dorsal section (20b) overlap on the body continuous; and a cutting step to cut the continuous body between the two weld sections (S) formed in the welding step.
    [0005]
    5. Method according to claim 4, characterized by the fact that the emission side end section (9b) has a dimension, in the length direction, over which the lateral edge portion of the frontal abdominal section (20a ) and the lateral edge portion of the posterior dorsal section (20b) can be welded by an entire strip of the same in the longitudinal direction, and the pair of end faces of the emission side end section (9b) positioned on both sides of the slot (9d) is arranged at a spacing greater than a predetermined cutting strip as a strip for cutting the continuous body along a cutting line extending in the longitudinal direction.
    [0006]
    6. Method according to claim 5, characterized by the fact that the emission side end section (9b) has a dimension, in the length direction, over which the lateral edge portion of the frontal abdominal section (20a ) and the lateral edge portion of the posterior dorsal section (20b) can be welded by an entire strip of the same in the longitudinal direction.
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    同族专利:
    公开号 | 公开日
    US20160107377A1|2016-04-21|
    BR112015031468A2|2017-07-25|
    US9452565B2|2016-09-27|
    CN105283300B|2017-12-12|
    EP2990181A4|2016-12-28|
    CN105283300A|2016-01-27|
    EP2990181A1|2016-03-02|
    JPWO2014200102A1|2017-02-23|
    WO2014200102A1|2014-12-18|
    JP6450310B2|2019-01-09|
    EP2990181B1|2020-06-10|
    EP2990181B8|2020-12-30|
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    法律状态:
    2018-02-27| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-12-10| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-12-15| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-01-26| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 13/06/2014, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    JP2013125941|2013-06-14|
    JP2013-125941|2013-06-14|
    PCT/JP2014/065806|WO2014200102A1|2013-06-14|2014-06-13|Ultrasonic horn, welder provided therewith, and method of producing disposable diaper using ultrasonic horn|
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