JP2019030439A - Composite stretchable member, absorbent article including the same, and manufacturing method of composite stretchable member - Google Patents

Abstract

To provide a novel composite stretchable member having improved performance.SOLUTION: In a composite stretchable member formed by depositing first and second sheet materials 15a, 15b, and a plurality of elastic members 20 juxtaposed in an arrangement direction crossing an expansion/contraction direction between one surface of the first sheet material and the second sheet material, by a plurality of first deposition lines 32 formed so as to cross each of the plurality of juxtaposed elastic members 20, a flute structure is formed by the first and second sheet materials 15a, 15b slackened by shrinkage force of the elastic member, between the first deposition lines 32 adjoining in the expansion/contraction direction.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a composite elastic member, an absorbent article provided with the composite elastic member, and a method for producing the composite elastic member, which can be applied to gathers of paper diapers.

Conventionally, an absorptive article in which a waist part and a crotch part are constituted by a composite elastic member is known.
Proposed as a device for manufacturing a composite stretchable member is a method in which an elastic member is placed on the surface of a sheet coated with a hot melt material and then another sheet is placed in a state of covering the elastic member. Has been. Thereby, in a state where the elastic member is disposed between the sheets, the two sheets and the elastic member are joined to each other to manufacture a composite elastic member (see Patent Document 1).

International Publication No. 2014/010340

In the case of absorbent articles, improvements in breathability and cushioning properties are demanded, and composite stretchable members are also demanded to improve performance in this respect.
The present invention has been developed from such a viewpoint, and an object thereof is to provide a novel composite stretchable member with improved performance, an absorbent article provided with the same, and a method for producing the composite stretchable member.

(1) In order to achieve the above object, the composite stretchable member of the present invention includes a first sheet material, a second sheet material, one surface of the first sheet material, and the second sheet material. A plurality of elastic members arranged side by side in the direction intersecting with the expansion / contraction direction between them by a plurality of first welding wires formed so as to cross each of the plurality of elastic members arranged side by side A flute structure is formed by the first and second sheet materials that are loosened by the contraction force of the elastic member between the first welding lines adjacent to each other in the expansion and contraction direction. It is said.
(2) It is preferable that the first welding wire is an ultrasonic welding wire that is ultrasonically welded.
(3) A plurality of second surfaces formed such that the other surface of the first sheet material and the third sheet material cross each of the plurality of elastic members at positions different from the first welding line. It is preferable that a flute structure is formed by the first sheet material and the third sheet material between the adjacent second welding wires which are welded by the welding wire.
(4) It is preferable that a multiple flute structure is formed in the sheet thickness direction by the first sheet material, the second sheet material, and the third sheet material.
(5) It is preferable that the second welding wire is an ultrasonic welding wire which is ultrasonically welded.

  (6) The absorbent article of the present invention is an absorbent article provided with the composite stretchable member described in any one of (1) to (5), wherein the first sheet material is on the skin surface side. It is characterized by being arranged in.

(7) Moreover, the manufacturing method of the composite elastic | stretch member of this invention WHEREIN: The expansion-contraction direction between the 1st and 2nd sheet | seat material, the one surface of the said 1st sheet | seat material, and the said 2nd sheet | seat material And a plurality of elastic members arranged side by side in a row direction intersecting each other by a plurality of first welding wires formed so as to traverse each of the plurality of elastic members arranged side by side The third sheet material is formed on the other surface of the first sheet material so as to cross each of the plurality of elastic members at a position different from the first welding line. A step of welding by two welding lines, and then the first sheet while sandwiching the plurality of elastic members in an extended state between one surface of the first sheet material and the second sheet material. Material, the second sheet material, and the plurality of elasticity And a step of welding the timber by the plurality of first weld line, and characterized in that it is performed.
(8) Another method for producing a composite elastic member of the present invention is the expansion and contraction between the first and second sheet materials, and one surface of the first sheet material and the second sheet material. Production of a composite elastic member in which a plurality of elastic members arranged side by side in a direction intersecting the direction are welded by a plurality of first welding wires formed so as to cross each of the plurality of elastic members arranged side by side In the method, the first sheet member and the second sheet member are sandwiched between the one surface of the first sheet member and the second sheet member in a stretched state. A step of welding the sheet material and the plurality of elastic members by the plurality of first welding wires, and then holding the stretched state of the plurality of elastic members on the other surface of the first sheet material The third sheet material is different from the first welding wire. And a step of welding a plurality of second weld lines formed to cross each of the plurality of elastic members in position, and characterized in that it is performed.
(9) It is preferable that ultrasonic welding is used for welding of at least one of the first welding line and the second welding line.

  According to the present invention, a flute structure (hollow structure) is formed between the adjacent first welding lines by the first and second sheet materials that are loosened by the contraction force of the elastic member.

It is an expanded view for demonstrating the structure of the paper diaper (absorbent article) common in each embodiment. It is AA arrow sectional drawing of FIG. In FIG. 2, the thickness of each sheet is exaggerated for easy understanding of each configuration. It is a schematic diagram for demonstrating the structure of the gather to which a composite elastic member is applied, and is the principal part enlarged view seen from the B direction of FIG. It is a typical block diagram of the manufacturing apparatus of the composite elastic member of 1st Embodiment. It is explanatory drawing of the manufacturing process of the composite elastic member of 1st Embodiment, (a1) is a top view which shows arrangement | positioning of the 2nd welding wire in a 1st process, (b1) is the sheet | seat material welded by the 2nd welding wire (A2) is a plan view showing the arrangement of the first welding line in the second step in an overlapping manner with the second welding line, (b2) is a composite stretchable member formed by welding with the first welding line. It is a longitudinal cross-sectional view. It is a typical block diagram of the manufacturing apparatus of the composite elastic member of 2nd Embodiment. It is explanatory drawing of the manufacturing process of the composite elastic member of 2nd Embodiment, (a1) is a top view which shows arrangement | positioning of the 2nd welding wire in a 1st process, (b1) is the sheet | seat material welded by the 2nd welding wire (A2) is a plan view showing the arrangement of the first welding line in the second step in an overlapping manner with the second welding line, (b2) is a composite stretchable member formed by welding with the first welding line. It is a longitudinal cross-sectional view. It is a longitudinal cross-sectional view of the composite elastic member which shows the modification of the composite elastic member of 2nd Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following embodiment is merely an example, and there is no intention of excluding various modifications and technical applications that are not explicitly described in this embodiment. Each configuration of the present embodiment can be implemented with various modifications without departing from the spirit thereof. Further, it can be selected as necessary, and can be appropriately combined.

  In the following embodiments, an example in which a composite elastic member is used for a disposable diaper (absorbent article) will be described.

  In each embodiment, the direction connecting the front body arranged facing the wearer's abdomen and the back body arranged facing the back of the disposable diaper is defined as a longitudinal direction L. Between these front body and back body (the center in the longitudinal direction), a crotch part disposed at the wearer's crotch (arranged facing the crotch) is located.

  Further, in a state where the paper diaper is worn by the wearer (hereinafter abbreviated as “wearing state”), the side facing the wearer's skin (inner side) is defined as the skin surface side, and the opposite side (outer side) of the skin surface is defined as non The skin side. Furthermore, a direction connecting the skin surface side and the non-skin surface side is defined as a thickness direction T, and a direction perpendicular to both the longitudinal direction L and the thickness direction T is defined as a width direction W. In addition, viewing from the thickness direction T is a plan view.

In addition, the longitudinal direction L, the thickness direction T, and the width direction W are similar to the articles constituting the paper diaper.
Moreover, about a manufacturing apparatus, the conveyance direction of a sheet material and a thread rubber respond | corresponds to the width direction W of a paper diaper, and the width direction orthogonal to a conveyance direction corresponds to the longitudinal direction L of a paper diaper.

[1. Common configuration in each embodiment]
The structure common to the manufacturing apparatus of the paper diaper and gathers in each embodiment is demonstrated.

First, the basic configuration of the disposable diaper 1 will be described with reference to FIG.
Here, the paper diaper 1 is formed symmetrically with respect to the center line CL in the width direction W. The paper diaper 1 is roughly divided into three regions along the longitudinal direction L: a front body 1A, a crotch 1B, and a back body 1C.

<Sheets>
First, the sheets of the disposable diaper 1 will be described.
As shown in FIG. 1, the disposable diaper 1 incorporates an absorbent body 10 (indicated by a thick broken line) that extends in the longitudinal direction L over the front body 1A, the crotch 1B, and the back body 1C. Here, the hourglass-shaped absorber 10 in which the crotch part 1B is smaller in the width direction W dimension than the front body 1A and the back body 1C in the front view in the unfolded state is illustrated.

  The absorbent body 10 has a water absorption property that absorbs and retains liquid water such as urine and menstrual blood excreted from the wearer (hereinafter referred to as “excreted water”). In order to improve the fit, water absorption and breathability of the disposable diaper 1 to the wearer, the skin surface side (absorbing surface side) of the absorbent body 10 and the center sheet 11 described later have compressed grooves 10a and 10b intersecting each other. It is extended linearly.

As shown in FIG. 2, various sheets 11, 12, 13, and 14 described below are provided on the skin surface side and the non-skin surface side with respect to the absorbent body 10 described above.
A center sheet 11 is laminated on the skin surface side with respect to the absorbent body 10, and a back sheet 12 is laminated on the non-skin surface side. Side sheets 13 are arranged on the side of the width direction W of these sheets 11 and 12.

  The cover sheet 14 covers the above-described absorber 10 and the sheets 11, 12, and 13 from the non-skin surface side. As shown in FIG. 1, the cover sheet 14 in the front body 1A and the cover sheet 14 in the back body 1C are attached to each other in the width direction edge portions 14a in this way. Each cover sheet 14 of 1C is joined, and the pants-type paper diaper 1 is formed.

<gather>
Next, the gathers 15 of the disposable diaper 1 will be described with reference to FIGS.
The gather 15 is configured as a composite stretchable member having stretchability.
Examples of the gather 15 include gathers 16, 17, and 18. One is a three-dimensional gather 16 provided at the skin surface side edge of the side sheet 13, and the other is a Tammy gather 17 provided in the front body 1A and the back body 1C. One is a second three-dimensional gather 18 (not shown in FIG. 1) provided at the edge in the width direction on the non-skin surface side of the side sheet 13.

  The Tammy gather 17 will be described as an example. The Tammy gather 17 is configured by sandwiching a rubber thread 20 (elastic member) having elasticity in an expanded state between two sheet materials 15a and 15b. A plurality of the thread rubbers 20 extend in the width direction W and are arranged side by side along the longitudinal direction L. Accordingly, here, the longitudinal direction L corresponds to the direction in which the rubber threads 20 are arranged.

Both the sheet materials 15a and 15b and the thread rubber 20 are connected to each other by a plurality of welding wires 30 (omitted in FIGS. 1 and 2) that extend in the longitudinal direction L and are provided along the width direction W. Welded. In a natural state in which no tensile force is applied to the thread rubber 20 (that is, a state in which the thread rubber 20 that has been stretched at the time of manufacture contracts), the sheet material 15a is interposed between the adjacent weld wires 30 on the thread rubber 20. , 15b are loosened and brought close together to form a convex ridge 40 and a flute structure (hollow structure).
Further, a coating layer made of magnesium stearate having a melting point lower than that of the thread rubber 20 is provided on the outer periphery of the thread rubber 20.

  The three-dimensional gather 16 is provided in order to prevent leakage of the excrement to the side in the width direction W by enhancing the followability to the wearer at the periphery of the excretion location. The tammy gather 17 is provided in order to enhance the followability to the wearer's buttocks and lower abdomen. The second three-dimensional gather 18 is provided in order to improve followability at the crotch 1B.

  As shown in FIG. 3, the essential structure of the composite elastic member is that two sheet materials are loosened by the contraction force of the rubber thread 20 between two welding wires 30 adjacent to each other in the elastic direction of the rubber thread 20. The flute structure (hollow structure) is formed by 15a and 15b, but in the following embodiment, the sheet material 15c is further added to the two sheet materials 15a and 15b, and the three sheet materials 15a to 15b are formed. The composite elastic member in which the composite flute structure is formed by 15c and the thread rubber 20 is illustrated.

[2. First Embodiment]
[2-1. Configuration of manufacturing equipment]
With reference to FIGS. 4 and 5, the manufacturing apparatus 100 </ b> A of the composite stretchable member (gather) 15 according to the present embodiment will be described by taking the manufacturing apparatus 100 </ b> A whose manufacturing target is the Tammy gather 17 as an example.
As shown in FIG. 4, the manufacturing apparatus 100A includes a first joining device 200A disposed on the upstream side (lower side in FIG. 4) and a second joining device disposed on the downstream side (upper side in FIG. 4). 200B. The first process is performed by the first bonding apparatus 200A, and then the second process is performed by the second bonding apparatus 200B.

  The first joining apparatus 200A includes a pair of corrugated rolls 210a and 210b that corrugately process the third sheet material 15c, and a first horn 220A for performing ultrasonic welding.

  Each of the corrugated rolls 210a and 210b is a rotating member that rotates about an axis extending in a direction orthogonal to the paper surface of FIG. In this example, as indicated by arrows in FIG. 4, the corrugated roll 210a rotates counterclockwise and the corrugated roll 210b rotates clockwise. The corrugated rolls 210a and 210b convey the third sheet material 15c fed between them while meshing with each other while being sandwiched between the corrugated outer peripheral surfaces, and step the third sheet material 15c into a wave shape in the longitudinal direction. The third sheet material 15c is conveyed downstream by the step roll 210a after the step processing. In addition, in FIG. 4, the unevenness | corrugation of the corrugated outer peripheral surface of corrugated roll 210a, 210b is modeled, and it has shown in the linear shape (planar shape) bent, but you may comprise a corrugated outer peripheral surface with a smooth curved surface.

  The first horn 220A is installed corresponding to the outer peripheral surface portion of the step roll 210a downstream from the contact point of the step rolls 210a and 210b. An output unit 221A that outputs energy for ultrasonic vibration toward the outer peripheral surface of the corrugated roll 210a is provided at the tip of the first horn 220A. The horn 220A applies ultrasonic vibration output from the output unit 221A while sandwiching (pressing while sandwiching) the sheet materials 15a and 15c to be conveyed between the ridges on the outer peripheral surface of the corrugated roll 210a. They are applied to 15a and 15c and welded together.

  That is, the third sheet material 15c is fed between the corrugated rolls 210a and 210b and stepped in a corrugated manner, and then held and conveyed on the outer peripheral surface of the corrugated roll 210a. The first sheet material 15a is fed to the upstream side of the outer peripheral surface of the corrugated roll 210a where the first horn 220A is installed, and is superimposed on the outer surface of the third sheet material 15c. When both the sheet materials 15a and 15c pass between the front end portion of the first horn 220A and the outer peripheral surface of the corrugated roll 210a, the both sheet materials 15a and 15c are for ultrasonic vibration output from the output portion 221A of the horn 220A. Receiving the energy of each, it melts and welds each other.

  In addition, the protruding item | line of the outer peripheral surface of the corrugated roll 210a is provided in the uneven | corrugated shaped convex part of a wavy outer peripheral surface. In the present embodiment, the corrugated outer peripheral surface of the corrugated roll 210a is formed by alternately and continuously forming deep concave grooves and shallow concave grooves, and the height of the convex portions is set constant. The corrugated outer peripheral surface of the corrugated roll 210b is formed by alternately and continuously forming high ridges and low ridges in accordance with the corrugated outer peripheral surface of the corrugated roll 210a, and the depth of the concave portions is set constant.

  FIG. 5A1 shows an ultrasonic welding line (hereinafter referred to as a second welding line) 31 by the first horn 220A based on the surface of the first sheet material 15a. Here, the second welding line 31 is shown. Are formed intermittently in the width direction of the sheet materials 15a, 15c, but may be formed continuously. In order to suppress the rigidity increase by the second weld line 31, it may be formed intermittently, and to promote the rigidity increase by the second weld line 31, it may be formed continuously.

  Further, the ridges on the outer peripheral surface of the corrugated roll 210 a are arranged on the outer peripheral surface of the corrugated roll 210 a so as to correspond to the second welding wire 31. Accordingly, as shown in FIG. 5 (b1), the third sheet material 15c has a wave shape in which high ridges and low ridges are alternately continued on the basis of the first sheet material 15a to be welded. The two sheet materials 15a and 15c form a flute structure. However, FIG. 4 does not show the height of the ridges.

  The second joining device 200 </ b> B includes an anvil roller 210 and a second horn 220 </ b> B installed corresponding to the outer peripheral surface of the anvil roller 210.

  The anvil roller 210 is a rotating member that rotates about an axis extending in a direction orthogonal to the paper surface of FIG. The anvil roller 210 rotates to convey the sheet materials 15a to 15c and the thread rubber 20 on the outer peripheral surface thereof. In this example, the anvil roller 210 rotates clockwise in FIG.

  The second horn 220B is disposed to face the outer peripheral surface of the anvil roller 210. Similarly to the first horn 220A, an output portion 221B that outputs energy for ultrasonic vibration is provided at the tip of the second horn 220B, and the output portion 221B is directed to the outer peripheral surface of the anvil roller 210. . As a result, the second horn 220B outputs the sheet materials 15a to 15c and the thread rubber 20 conveyed by the anvil roller 210 while being pinched (pressed while being pinched) between the protrusions on the outer peripheral surface of the anvil roller 210. The ultrasonic vibration output from the part 221B is applied to the sheet materials 15a to 15c and the thread rubber 20 to weld them.

  That is, the first sheet material 15a and the third sheet material 15c and the second sheet material 15b which are welded to each other are fed to the outer peripheral surface of the anvil roller 210 so as to sandwich the rubber thread 20 therebetween. Then, the output portion 221B of the second horn 220B is pressed against the sheet materials 15a and 15c, the thread rubber 20, and the sheet material 15b on the outer peripheral surface of the anvil roller 210B, and ultrasonic vibration is performed while pinching them with the anvil roller 210. Is granted. Accordingly, the sheet materials 15a and 15c, the thread rubber 20, and the sheet material 15b are melted and welded to each other.

  FIG. 5 (a2) shows an ultrasonic welding line (hereinafter referred to as a first welding line) 32 by the second horn 220B based on the surfaces of the sheet materials 15a and 15b, a second welding line 32 and a thread by the first horn 220A. As shown in FIG. 5 (a2), the first welding wire 32 is continuously formed in the width direction of the sheet materials 15a to 15c as shown in FIG. May be formed. This may also be selected according to the demand for rigidity enhancement by the first welding wire 32.

  The ridges on the outer peripheral surface of the anvil roller 210 are arranged on the outer peripheral surface of the anvil roller 210 so as to correspond to the first welding line 32. As a result, the sheet materials 15a to 15c and the thread rubber 20 are joined as shown in FIG. 5B2, and the three sheet materials 15a to 15c form a multiple flute structure.

  As shown in FIG. 5 (a2), the rubber thread 20 is introduced into the outer peripheral surface of the anvil roller 210 in a state parallel to the front-rear direction, and the outer periphery of the anvil roller 210 is first on the outer peripheral surface of the anvil roller 210. The sheets are placed side by side in the width direction on the sheet material 15b introduced into the surface. Further, the rubber thread 20 is introduced into the anvil roller 210 in a state where it is stretched in the circumferential direction of the anvil roller 210 (extension state). In the present embodiment, the rubber thread 20 is introduced into the anvil roller 210 in an extended state (the natural state is 100%) extended to 300% of the natural state. The stretched state of the rubber thread 20 introduced into the anvil roller 210 is not limited to 300% of the natural state, and can be set as appropriate within a range of 150% to 400% of the natural state, for example.

[2-2. Composition of composite elastic member]
In the first joining device 200A, as shown in FIGS. 5 (a1) and 5 (b1), the sheet materials 15a and 15c are welded by the second welding wire 31 arranged in the longitudinal direction (stretching direction of the thread rubber 20). The For this reason, as shown in FIG. 5B1, a flute structure having a hollow portion 151 is formed between the adjacent second welding wires 31 by the sheet materials 15a and 15c. Since the second welding line 31 is formed in the longitudinal direction so as to alternately repeat the relatively long first interval L1 and the relatively short second interval L2, the large hollow portion 151a is formed by the sheet materials 15a and 15c. Small hollow portions 151b are formed repeatedly.

  In the second bonding apparatus 200B, as shown in FIG. 5 (a2), the first welding wire 32 is disposed between the second welding wires 31 adjacent to each other at a short second interval L2, and the first and third welding wires are disposed. The sheet materials 15a and 15c and the second sheet material 15b are intermittently welded to each other by the first welding wire 32 with the rubber thread 20 interposed therebetween. For this reason, when the rubber thread 20 contracts to a natural state, as shown in FIG. 5 (b2), between the adjacent first welding wires 32, there are multiple hollow portions formed by the sheet materials 15a, 15c, and 15b. 151a and 151c are formed repeatedly.

  In other words, since the small hollow portion 151b is joined by the first welding wire 32 and is ignored, the large hollow portion 151a formed by the sheet materials 15a and 15c increases in height due to the shrinkage of the thread rubber 20, and the hollow portion A hollow portion 151c is formed by the sheets 15b and 15c closer to the thread rubber 20 than 151a. That is, the hollow part 151a and the hollow part 151c are formed in multiple (here double) in the sheet thickness direction of the sheet materials 15a to 15c.

[2-3. Action and effect]
The composite elastic member according to the present embodiment can be manufactured by performing the first step by the first joining device 200A and the second step by the second joining device 200B in this order.
According to the composite elastic member according to the present embodiment manufactured in this way, the first and second sheet materials 15a loosened by the contraction force of the thread rubber 20 between the adjacent second welding wires 31. Since the flute structure is formed by 15b, it is possible to promote the air permeability of the composite elastic member (tammy gather) and the improvement of the cushioning property.

  In particular, the hollow portions 151a and the hollow portions 151c are formed in multiple layers in the sheet thickness direction by the second and first welding wires 31 and 32 and the first to third sheet materials 15a to 15c, and the sheet becomes dense. By applying the first and third sheet materials 15a and 15c, which ensure both air permeability and cushioning properties, to the skin surface side, it is possible to make the wearer feel better.

[3. Second Embodiment]
[3-1. Configuration of manufacturing equipment]
With reference to FIGS. 6 and 7, the manufacturing apparatus 100 </ b> B of the composite elastic member (gather) 15 according to the present embodiment will be described by taking a manufacturing apparatus 100 </ b> B whose target to be manufactured is the Tammy gather 17 as an example.
As illustrated in FIG. 6, the manufacturing apparatus 100 </ b> B includes a first joining device 200 </ b> C disposed on the upstream side (lower right side in FIG. 6) and a second bonding device disposed on the downstream side (upper left side in FIG. 6). And a joining device 200D. The first process is performed by the first bonding apparatus 200C, and then the second process is performed by the second bonding apparatus 200D.

The first joining device 200C includes a first anvil roller 210C and a first horn 220C installed corresponding to the outer peripheral surface of the anvil roller 210C.
Similarly to the first joining device 200C, the second joining device 200D includes a second anvil roller 210D and a second horn 220D installed corresponding to the outer peripheral surface of the anvil roller 210D.

  Each of the anvil rollers 210C and 210D is a rotating member that rotates about an axis extending in a direction orthogonal to the paper surface of FIG. The anvil rollers 210C and 210D rotate to convey the sheet materials 15a and 15b and the thread rubber 20 on the outer peripheral surface thereof. In this example, the anvil rollers 210C and 210D rotate clockwise in FIG.

  Horns 220C and 220D are arranged to face the outer peripheral surfaces of anvil rollers 210C and 210D. Further, output portions 221C and 221D that output ultrasonic vibration energy are provided at the tips of the horns 220C and 220D, and the output portions 221C and 221D are directed to the outer peripheral surfaces of the anvil rollers 210C and 210D. As a result, the horns 220C and 220D pinch (pressurize while pinching) the sheet materials 15a to 15c and the thread rubber 20 conveyed by the anvil rollers 210C and 210D between the ridges on the outer peripheral surface of the anvil roller 210. The ultrasonic vibrations output from the output units 221C and 221D are applied to the sheet materials 15a to 15c and the thread rubber 20 to weld them.

  That is, the first sheet material 15a and the second sheet material 15b are fed into the outer peripheral surface of the first anvil roller 210C with the rubber thread 20 interposed therebetween. Then, the output portion 221C of the first horn 220C is pressed against the sheet material 15a, the thread rubber 20, and the sheet material 15b on the outer peripheral surface of the anvil roller 210C, and ultrasonic vibration is applied while pinching them with the anvil roller 210C. To do. Accordingly, the sheet material 15a, the thread rubber 20, and the sheet material 15b are melted and welded to each other.

  Further, the first sheet material 15a, the thread rubber 20, and the second sheet material 15b that are welded together are fed into the outer peripheral surface of the second anvil roller 210D. Then, the output portion 221D of the second horn 220D is pressed against the sheet materials 15a and 15b and the thread rubber 20 on the outer peripheral surface of the anvil roller 210D, and ultrasonic vibration is applied while pinching them with the anvil roller 210D. Accordingly, the sheet materials 15a and 15b and the thread rubber 20 are melted and welded to each other.

  FIG. 7 (a1) shows an ultrasonic welding line (hereinafter referred to as a first welding line) 33 by the first horn 220C based on the surfaces of the sheet materials 15a and 15b superimposed on the rubber thread 20, and here, The first welding wire 33 is continuously formed in the width direction of the sheet materials 15a and 15b. The first weld line 33 may also be formed intermittently, and may be selected according to the demand for increased rigidity by the first weld line 33.

  The ridges on the outer peripheral surface of the first anvil roller 210C are arranged on the outer peripheral surface of the anvil roller 210C so as to correspond to the first welding wire 33. Accordingly, the sheet materials 15a and 15b and the thread rubber 20 are joined as shown in FIG. 7B1, and the two sheet materials 15a and 15b form a flute structure.

Here, on the downstream side of the first joining device 200C and the upstream side of the second joining device 200D, the third sheet material 15c on the opposite side of the first sheet material 15a from the second sheet material 15b. A modified example when supplying is described.
FIG. 7 (a2) shows an ultrasonic welding line (hereinafter referred to as a second welding line) 34 by the second horn 220D on the basis of the surfaces of the sheet materials 15a to 15c superimposed on the rubber thread 20. Here, FIG. The second welding wire 34 is continuously formed in the width direction of the sheet materials 15a to 15c. The second weld line 34 may also be formed intermittently, and may be selected according to the demand for increased rigidity by the second weld line 34.

  The ridges on the outer peripheral surface of the second anvil roller 210D are arranged on the outer peripheral surface of the anvil roller 210D so as to correspond to the second welding line 34. As a result, the sheet materials 15a to 15b and the thread rubber 20 are joined as shown in FIG. 7B2, and the three sheet materials 15a to 15c form a multiple flute structure.

[3-2. Composition of composite elastic member]
In the first joining device 200C, as shown in FIG. 7A1, the first sheet material 15a, the thread rubber 20, and the second sheet material 15b are arranged in the longitudinal direction (stretching direction of the thread rubber 20). It is welded at the first welding wire 33. For this reason, when the rubber thread 20 contracts to a natural state, as shown in FIG. 7 (b1), a flute structure having a hollow portion 151d is formed between the adjacent first welding wires 33 by the sheet materials 15a and 15b. It is formed. However, at the stage of joining in the first joining device 200C, the rubber thread 20 remains in the stretched state and has not yet contracted, so that the state shown in FIG.

  And in 2nd joining apparatus 200D, as shown to FIG. 7 (a2), the 2nd welding line 34 is each arrange | positioned between each adjacent 1st welding line 33, and the 1st and 2nd which pinched | interposed the rubber thread 20 The second sheet materials 15a and 15b and the third sheet material 15c fed to the first sheet material 15a side are intermittently welded to each other by the second welding wire 32. For this reason, when the rubber thread 20 contracts to a natural state, as shown in FIG. 7 (b2), between the adjacent second welding wires 34, a hollow portion having a multiple shape is formed by the sheet materials 15a, 15c, and 15b. 151e and 151f are formed repeatedly.

  That is, the hollow portion 151d formed by the sheet materials 15a and 15b is divided into the hollow portions 151e and 151e by the second welding wire 34, and is outside the hollow portions 151e and 151e (with respect to the first sheet material 15a). On the side opposite to the thread rubber 20, a hollow portion 151f is formed by the sheet materials 15a and 15c. That is, the hollow part 151e and the hollow part 151f are formed in multiple (here double) in the sheet thickness direction of the sheet materials 15a to 15c.

[3-3. Action and effect]
According to the composite elastic member according to the present embodiment, a flute structure is formed between the adjacent first welding wires 33 by the first and second sheet materials 15a and 15b which are loosened by the contraction force of the thread rubber 20. Thus, it is possible to promote the air permeability of the composite stretchable member and the improvement of the cushioning property.

  In particular, the first and third welding wires 33 and 34 and the first to third sheet materials 15a to 15c form a plurality of hollow portions 151e and hollow portions 151f in the sheet thickness direction. By applying the first and third sheet materials 15a and 15c, which ensure both the property and the cushioning property, to the skin surface side, it is possible to make the wearer feel better.

  In addition, although the 1st and 2nd welding wires 33 and 34 are intermittently formed in the longitudinal direction (the width direction of the sheet materials 15a to 15c), it is possible to suppress an improvement in rigidity around the welding wires 33 and 34. The rigidity around the welding wires 33 and 34 can also be adjusted by the welding width of the first and second welding wires 33 and 34.

  For example, as shown in FIG. 8, if the welding widths of the first and second welding wires 33 and 34 are widened, the rigidity can be further increased, and it is conceivable that air permeability can be ensured and cushioning can be improved. . If the welding width is narrowed, the improvement in rigidity can be suppressed.

[4. Others]
In each of the above-described embodiments, the welding wires 31 to 34 are all ultrasonic welding wires by ultrasonic welding, and welding can be easily performed in a desired welding wire state. You may change a part or all into the adhesion line by other adhesion | attachment means, such as a hot melt.
As described in each of the above embodiments, one or a plurality (including all) of the plurality of welding lines may be the continuous lines described above, but the dotted welding points are continuous. One or a plurality (including all) of the (aggregation of welding points) may be included.
By making a through hole in the outer peripheral surface of each flute, the air circulation degree and cushioning properties can be changed.

  In each of the above-described embodiments, an example in which multiple flute structures are formed in the sheet thickness direction is illustrated, but even a simple flute structure as shown in FIG. 3 is sandwiched between at least two sheet materials. By integrally welding the elastic member (thread rubber) to be bonded together with adjacent welding wires, the shape of each hollow portion can be reliably generated, and a flute structure with a certain tension can be obtained.

  In each of the above embodiments, the composite stretchable member, the manufacturing apparatus, and the manufacturing method of the present invention are applied to the Tammy gather 17 and the manufacture thereof, but can be applied to the three-dimensional gather 16 or the second three-dimensional gather 18. Applicable where needed.

  The composite elastic member described above can be applied to gathers provided in various absorbent articles such as tape-type paper diapers, urine pads, sanitary napkins, and panty liners in addition to the illustrated pants-type paper diapers.

  A stretchable film (elastic member) may be used instead of or in addition to the rubber thread 20 used for the composite stretchable member. In this case, similarly to the thread rubber 20 described above, a coating layer having a low melting point is provided on the outer periphery of the film.

  The welding line 31 is not limited to the broken line like the welding line 31 of the first embodiment or the continuous welding line such as the welding lines 32 to 34 of the first and second embodiments. You may employ | adopt the welding line | wire which makes | forms various intermittent forms, such as the multi-dot chain line | wire shape which has many short lines, such as a chain line. Further, the welding wire is not limited to a triangular wave shape, and various extending shape welding wires such as a sine wave shape or a rectangular wave shape may be employed. In addition to the linear shape, the weld line may be formed in a bent line shape or a curved shape.

1 Paper diaper 15 Gather (composite elastic member)
15a, 15b, 15c Sheet material 16 Three-dimensional gather (composite elastic member)
17 Tammy Gather (Composite elastic member)
18 Second Solid Gather (Composite Elastic Member)
20 Rubber thread (elastic member)
30 welding wire 32, 33 1st welding wire 31, 34 2nd welding wire 40 Ｌ L longitudinal direction (arrangement direction of rubber thread 20)
W Width direction (stretching direction of rubber thread 20)

Claims (9)

A plurality of first and second sheet materials, and a plurality of elastic members arranged side by side in an alignment direction intersecting with the expansion and contraction direction between one surface of the first sheet material and the second sheet material; A composite stretchable member welded by a plurality of first welding wires formed so as to cross each of the plurality of elastic members arranged side by side,
A compound expansion and contraction characterized in that a flute structure is formed between the first welding lines adjacent to each other in the expansion and contraction direction by the first and second sheet materials loosened by the contraction force of the elastic member. Element. 2. The composite stretchable member according to claim 1, wherein the first weld line is an ultrasonic weld line. By the plurality of second welding lines formed so that the other surface of the first sheet material and the third sheet material cross each of the plurality of elastic members at a position different from the first welding line. 3. The flute structure is formed by the first sheet material and the third sheet material between the second weld lines that are welded and adjacent to each other. 3. The composite elastic member described in 1. 4. The compound stretchable structure according to claim 3, wherein a multiple flute structure is formed in the sheet thickness direction by the first sheet material, the second sheet material, and the third sheet material. Element. 5. The composite stretchable member according to claim 3, wherein the second weld line is an ultrasonic weld line. An absorbent article comprising the composite elastic member according to any one of claims 1 to 5,
The absorbent article, wherein the first sheet material is disposed on the skin surface side. A plurality of first and second sheet materials, and a plurality of elastic members arranged side by side in an alignment direction intersecting with the expansion and contraction direction between one surface of the first sheet material and the second sheet material; A method of manufacturing a composite stretchable member welded by a plurality of first welding wires formed so as to cross each of the plurality of elastic members arranged side by side,
A third sheet material is welded to the other surface of the first sheet material by a plurality of second welding wires formed so as to cross each of the plurality of elastic members at a position different from the first welding wire. And a process of
Then, while sandwiching the plurality of elastic members in an extended state between one surface of the first sheet material and the second sheet material, the first sheet material and the second sheet material A method of manufacturing a composite elastic member, comprising performing the step of welding the plurality of elastic members with the plurality of first welding wires. A plurality of first and second sheet materials, and a plurality of elastic members arranged side by side in an alignment direction intersecting with the expansion and contraction direction between one surface of the first sheet material and the second sheet material; A method of manufacturing a composite stretchable member welded by a plurality of first welding wires formed so as to cross each of the plurality of elastic members arranged side by side,
While sandwiching the plurality of elastic members in an extended state between one surface of the first sheet material and the second sheet material, the first sheet material, the second sheet material, and the plurality of sheets Welding the elastic member with the plurality of first welding wires,
Thereafter, while maintaining the extended state of the plurality of elastic members, the third sheet material is placed on the other surface of the first sheet material at a position different from the first welding line, respectively. And a step of welding with a plurality of second welding lines formed so as to cross the wire. The method for manufacturing a composite stretchable member according to claim 7 or 8, wherein ultrasonic welding is used for welding at least one of the first welding line and the second welding line.

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