JP2019097926A - Composite expansion/contraction member - Google Patents

Abstract

To provide a new composite expansion/contraction member.SOLUTION: A composite expansion/contraction member 15 is a composite expansion/contraction member which is obtained by welding two sheet materials 15a,15b and a plurality of elastic members 20 arranged in an arrangement direction crossing an expanding/contracting direction W between the sheet materials 15a,15b, by a plurality of welding lines 30 formed so as to cross the plurality of arranged elastic members 20. The welding line 30 is composed by alternately continuously providing a first welding part 30A inclined to one side in the expanding/contracting direction W, and a second welding part 30B inclined to the other side in the expanding/contracting direction W, and the first welding part 30A and the second welding part 30B each cross at least two elastic members 20.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a composite stretchable member applicable to gathers of a disposable diaper.

DESCRIPTION OF RELATED ART Conventionally, the absorbent article in which the waist part and crotch part were comprised with the compound expansion-contraction member is known.
As a device for producing a composite stretchable member, a method is proposed in which another sheet is placed in a state covering an elastic member after the elastic member is placed in a state of being stretched on the surface of a sheet to which a hot melt material is applied. It is done. Thereby, in a state in which the elastic member is disposed between the sheets, the respective members of the two sheets and the elastic member are joined to each other to manufacture a composite stretchable member (see Patent Document 1).

International Publication 2014/010340

  An object of the present invention is to provide a novel composite elastic member.

  (1) In order to achieve the above object, the composite stretchable member of the present invention comprises two sheets of sheet material, and a plurality of elastic members juxtaposed in a row direction intersecting with the stretch direction between the sheet materials. A composite stretchable member welded by a plurality of welding lines formed to intersect each of the plurality of juxtaposed elastic members, wherein the welding line is inclined to one side in the expansion and contraction direction A welded portion and a second welded portion inclined to the other side in the expansion and contraction direction are alternately provided, and the first welded portion and the second welded portion each have at least two elastic members. It is characterized by crossing.

  (2) In addition, in order to achieve the above object, the composite stretchable member of the present invention is an elastic member in which a plurality of sheets of sheet material and a plurality of the sheet materials are juxtaposed in a row direction intersecting with the stretch direction. A composite stretchable member welded by a plurality of welding lines formed so as to intersect each of the plurality of juxtaposed elastic members, wherein the welding line is inclined to one side in the expansion and contraction direction A first welding portion and a second welding portion inclined to the other side in the expansion / contraction direction are continuously provided, and the first welding portion and the second welding portion are at least two elastic members respectively. A first welding pattern consisting of at least two adjacent welding lines crossing each other, and a second welding pattern line-symmetrical to the first welding pattern are arranged in parallel along the expansion and contraction direction. .

  According to the present invention, it is possible to manufacture a composite stretchable member which is excellent in fit, cushioning property, and feeling of wear such as touch, and which can adjust the degree of tightening and flexibility.

It is an expanded view for explaining composition of a disposable diaper common to each embodiment. It is AA arrow sectional drawing of FIG. It is a schematic diagram for demonstrating the structure of a gather, and is the principal part enlarged view seen from B direction of FIG. It is a schematic diagram which shows the structure of the manufacturing apparatus of the gather which is common in each embodiment. (A) is a schematic diagram which shows the structure of the Tammy gather of 1st embodiment, (b), (c) is a principal part enlarged view of (a). It is a schematic diagram which shows the structure of the modification of the Tammy gather of 1st embodiment. It is a schematic diagram which shows the structure of the modification of the Tammy gather of 1st embodiment. It is a schematic diagram which shows the structure of the Tammy gather of 2nd embodiment. It is a schematic diagram which shows the structure of the modification of the Tammy gather of 2nd embodiment. It is a schematic diagram which shows the structure of the modification of the Tammy gather of 2nd embodiment.

  Hereinafter, modes for carrying out the present invention will be described. The following embodiment is merely an example, and it is not intended to exclude application of various modifications and techniques not explicitly described in this embodiment. Each structure of this embodiment can be variously modified and implemented in the range which does not deviate from the meaning. Also, they can be selected as needed, and can be combined as appropriate.

  The following embodiment demonstrates the example which used the compound expansion-contraction member for the paper diaper (absorbent article).

In the present embodiment, in the paper diaper, a longitudinal direction is a direction connecting a front body disposed facing the abdomen of the wearer and a rear body disposed facing the back. Between the front body and the back body (the center in the longitudinal direction), there is a crotch portion which is disposed in the crotch region of the wearer (arranged opposite to the crotch region).
Furthermore, in a state where the paper diaper is worn (hereinafter referred to as "wearing state"), the side (inner side) facing the wearer's skin is the skin side, and the opposite side (outside) of the skin side is the non-skin side I assume. Furthermore, a direction connecting the skin surface side and the non-skin surface side is taken as a thickness direction, and a direction orthogonal to both the longitudinal direction and the thickness direction is taken as a width direction. In addition, viewing from the thickness direction is referred to as plan view.
Moreover, the longitudinal direction, the thickness direction, and the width direction of the articles constituting the disposable diaper conform to this.
Moreover, about a manufacturing apparatus, the conveyance direction of a sheet material or thread rubber respond | corresponds to the width direction of a paper diaper, and the width direction orthogonal to a conveyance direction respond | corresponds to the longitudinal direction of a paper diaper.

[1. overall structure]
The structure common to the manufacturing apparatus of a paper diaper and a gather is demonstrated.
[1-1. Overall configuration of disposable diapers]
First, with reference to FIG. 1, the basic configuration of the disposable diaper 1 will be described.
Here, the disposable diaper 1 is symmetrically configured on the basis of the center line CL in the width direction W. The disposable diaper 1 is roughly divided into three regions of a front body 1A, a crotch 1B and a back body 1C along the longitudinal direction L.

<Sheets>
First, the sheets of the disposable diaper 1 will be described.
As shown in FIG. 1, the paper diaper 1 incorporates an absorbent body 10 (shown by a thick broken line) extending in the longitudinal direction L across the front body 1A, the crotch 1B and the rear body 1C. Here, an hourglass-shaped absorbent body 10 in which the crotch portion 1B has a smaller size in the width direction W than the front body 1A and the rear body 1C in a front view of the unfolded state is illustrated.

  The absorber 10 has a water absorbing property that absorbs and holds liquid moisture (hereinafter referred to as “excreted water”) such as urine and menstrual blood excreted from the wearer. In order to enhance fit, water absorbability and air permeability of the paper diaper 1 to the wearer, compressed grooves 10a and 10b intersecting each other are formed on the skin surface side (absorbent surface side) of the absorbent body 10 and the center sheet 11 described later. It extends linearly.

As shown in FIG. 2, various sheets 11, 12, 13, 14 described below are provided on the skin surface side and the non-skin surface side with respect to the above-described absorbent body 10. In addition, in FIG. 2, in order to make each structure easy to grasp, the thickness of each sheet | seat type is exaggerated and shown.
The center sheet 11 is laminated on the skin surface side with respect to the absorbent body 10, and the back sheet 12 is laminated on the non-skin surface side. Side sheets 13 are disposed on the sides of the sheets 11 and 12 in the width direction W.

  The cover sheet 14 covers the above-mentioned absorber 10 and the sheets 11, 12, 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 rear body 1C are pasted to each other in the width direction edge portions 14a. In this manner, the cover sheets 14 of the front body 1A and the back body 1C are joined to form the pants-type paper diaper 1.

<gather>
Next, the gathers 15 of the disposable diaper 1 will be described with reference to FIGS. 1 to 3.
The gathers 15 are configured as a composite stretchable member having stretchability.
As the gathers 15, gathers 16, 17, 18 are illustrated. One is a solid gather 16 provided at the skin surface side edge of the side sheet 13. The other is a Tammy gather 17 provided on the front body 1A and the rear body 1C. The other is a second solid gather 18 (not shown in FIG. 1) provided at the end in the width direction on the non-skin surface side of the side sheet 13.

Taking the Tammy Gather 17 as an example, the Tammy Gather 17 stretches a stretchable rubber thread 20 (elastic member), and between the two sheet members 15a and 15b that make up the cover sheet 14 It is composed by sandwiching. A plurality of thread rubbers 20 extend in the width direction W and are disposed along the longitudinal direction L. The two sheet members 15a and 15b and the rubber thread 20 generally extend in the longitudinal direction L and a plurality of welding lines 30 are provided along the width direction W (not shown in FIGS. 1 and 2). It is welded. In a natural state in which no tensile force is applied to the thread rubber 20 (that is, in a state in which the thread rubber 20 is in an expanded state at the time of manufacture contracts), the sheet material 15a is formed between the welding lines 30 adjacent on the thread rubber 20 , 15b are formed to form a convex ridge 40.
In addition, a covering 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 solid gathers 16 are provided in order to prevent the leakage of the excrement in the width direction W side by enhancing the followability to the wearer at the periphery of the excretory part. The tummy gathers 17 are provided to enhance the followability to the buttocks and lower abdomen of the wearer. The second solid gathers 18 are provided in the crotch portion 1B to enhance the followability.

[1-2. Overall configuration of manufacturing equipment]
With reference to FIG. 4, the manufacturing apparatus 100 of the gather 15 (the apparatus for manufacturing a composite stretchable member) will be described by taking the manufacturing apparatus 100 whose manufacturing object is the tummy gather 17 as an example.
The manufacturing apparatus 100 is a bonding apparatus which ultrasonically welds the thread rubber 20, the sheet members 15a and 15b, and the sheet members 15a and 15b with the thread rubber 20 sandwiched between the sheet members 15a and 15b. It has 200. The bonding apparatus 200 includes an anvil roller 210 and a horn 220.

  The anvil roller 210 is a rotating member that rotates about an axis extending in a direction orthogonal to the paper surface of FIG. 4. Hereinafter, the direction orthogonal to the sheet of FIG. 4 is referred to as the front-rear direction. By rotating, the anvil roller 210 conveys the rubber thread 20 in a state of being sandwiched between the sheet members 15a and 15b on the outer peripheral surface thereof. In the example shown in FIG. 4, the anvil roller 210 rotates clockwise. Hereinafter, the sheet materials 15a and 15b in a state in which the thread rubber 20 is sandwiched and before ultrasonic welding (bonding) by the bonding apparatus 200 may be referred to as "sheet materials 15a and 15b before welding". On the outer peripheral surface of the anvil roller 210, a linear convex (not shown in FIG. 4) protruding outward in the radial direction is formed.

  The horn 220 applies ultrasonic waves to the pre-welding sheet materials 15a and 15b while holding the pre-welding sheet materials 15a and 15b conveyed by the anvil roller 210 with the outer peripheral surface of the anvil roller 210 It is a device that applies vibration. The horn 220 is disposed to face the outer circumferential surface of the anvil roller 210. In the example of FIG. 4, it is disposed to face the left portion of the outer circumferential surface of the anvil roller 210. At the tip of the horn 220, an output part 221 for outputting energy for ultrasonic vibration applied toward the outer peripheral surface of the anvil roller 210 is provided.

  The horn 220 applies ultrasonic vibration to the pre-welding sheet materials 15a and 15b while pressing the output part 221 against the pre-welding sheet materials 15a and 15b and sandwiching the pre-welding sheet materials 15a and 15b with the anvil roller 210. . Thus, the sheet members 15a and 15b are melted and welded to each other. Further, the outer periphery of the thread rubber 20 is also melted, and the thread rubber 20 and the sheet members 15a and 15b are welded to each other. Specifically, the output portion 221 sandwiches the pre-welding sheet members 15a and 15b with the ridges of the outer peripheral surface of the anvil roller 210, and is disposed on the ridges of the sheet members 15a and 15b before welding. The sheet members 15a and 15b and the thread rubber 20 and the sheet members 15a and 15b are linearly welded to each other in the other portion. In other words, a linear welding portion (welding line) for welding the rubber thread 20 and the sheet members 15a and 15b is formed in correspondence with (coincident with) the shape of the convex line.

  As described above, since the coating layer having a melting point lower than that of the thread rubber 20 is provided on the outer periphery of the thread rubber 20, the thread rubber 20 is melted when the thread rubber 20 and the sheet members 15a and 15b are welded. The covering layer melts without welding, and the covering layer and the sheet members 15a and 15b are welded.

  The output portion 221 of the horn 220 extends in the front-rear direction, and the horn 220 applies ultrasonic vibration to the outer peripheral surface of the anvil roller 210 in the entire rotational axis direction of the anvil roller 210. While the sheet before welding is conveyed by the anvil roller 210, the horn 220 always applies ultrasonic vibration. Therefore, as the sheet before welding is conveyed by the anvil roller 210, the sheet before welding is continuously welded.

  The rubber thread 20 is introduced to the outer peripheral surface of the anvil roller 210 in parallel to the front-rear direction, and on the outer peripheral surface of the anvil roller 210, the width thereof is on the sheet 15b previously introduced to the outer peripheral surface of the anvil roller 210. It is placed side by side in the direction. Also, the thread rubber 20 is introduced to the anvil roller 210 in a state of being stretched in the circumferential direction of the anvil roller 210 (stretched state). In the present embodiment, the thread rubber 20 is introduced to the anvil roller 210 in an extended state (the natural state is assumed to be 100%) extended to 300% of the natural state. The stretched state of the thread rubber 20 introduced to the anvil roller 210 is not limited to 300% of the natural state, and can be appropriately set, for example, within the range of 150% to 400% of the natural state.

[2. First embodiment]
[2-1. Composition of main parts of gather]
The gather 15 of the first embodiment will be described with reference to FIG. 5 by taking an example of the Tammy gather 17 (hereinafter referred to as “tammy gather 17A”) as an example.
As described above, in the state where the thread rubber 20 is sandwiched between the sheet members 15a and 15b, the Tammy gather 17A is a welding line formed such that the sheet members 15a and 15b and the thread rubber 20 intersect with the thread rubber 20. 30 are mutually welded (bonded). In the welding portion (welding line 30), the sheet material 15a, 15b or the sheet material 15a, 15b and the thread rubber are welded. Therefore, the welded portion appears on the surface of the sheet members 15a and 15b (surface facing away from each other) as a portion having an appearance or touch different from other non-welded portions, and may be recognized by sight or touch it can.

The welding line 30 of the present embodiment is configured by alternately arranging a first welding portion 30A and a second welding portion 30B. Further, in the example shown in FIG. 5, two types of welding lines 30-1 (first welding line) and welding lines 30-2 (second welding line) are provided as welding lines 30. The first welding line 30-1 and the second welding line 30-2 are line symmetrical with each other with respect to the center line CL 1 along the alignment direction of the thread rubber 20, and are alternately arranged in the expansion and contraction direction of the thread rubber 20. ing.
In the example shown in FIG. 5, the alignment direction of the rubber threads 20 is oriented along the longitudinal direction L of the paper diaper 1. Therefore, it may be described as “arrangement direction L” below. Moreover, the expansion-contraction direction of the thread rubber 20 is equal to the width direction W of the paper diaper 1. Therefore, it may be described as “stretching direction W” below.

The first welded portion 30A is inclined to one side in the expansion / contraction direction W of the thread rubber 20, and the second welded portion 30B is inclined to the other side in the expansion / contraction direction W of the thread rubber 20. Further, as shown in FIGS. 5 (b) and 5 (c), connecting points Px and Py at which the first welded portion 30A and the second welded portion 30B are connected are the welding lines 30 along the alignment direction L. They are located opposite to each other with respect to the center line CL2. As an example of the welding wire 30 of such a shape, in FIG. 5, the first welding portion 30A is inclined at a predetermined angle θ1 with respect to the expansion and contraction direction W, and the second welding portion 30B is predetermined with respect to the expansion and contraction direction W The welding line 30 of the shape inclined to angle (theta) 2 is shown. That is, in the welding line 30 shown in FIG. 5, the first welding portion 30A and the second welding portion 30B are alternately provided in a zigzag shape (triangular wave shape) while repeating a predetermined inclination with respect to the expansion and contraction direction W ing.
FIG. 5 shows an example in which the angles θ1 and θ2 are equal. That is, the first welded portion 30A and the second welded portion 30B are inclined in opposite directions at the same angle with respect to the expansion and contraction direction W.
Here, the angle θ1 refers to an acute angle among angles formed by a straight line parallel to the expansion and contraction direction W and the first welded portion 30A. Further, the angle θ2 is an acute angle in the angle formed by the straight line parallel to the expansion and contraction direction W and the second welded portion 30B.

  The first welded portion 30A and the second welded portion 30B intersect with at least two thread rubbers 20, respectively. In FIG. 5, the 1st welding part 30A and the 2nd welding part 30B show the example which each crossed with two thread rubbers 20. As shown in FIG.

When two sheets of sheet material 15a and 15b and thread rubber 20 and sheet materials 15a and 15b are welded by welding wire 30 of the above-mentioned shape, convex ridges 40 (see FIG. 3) along welding line 30 It is formed. That is, in the example shown in FIG. 5, the convex ridges 40 are formed along the zigzag welding lines 30. According to the convex ridges 40 formed along the welding line 30, compared with the convex ridges formed along the linear welding line (welding lines with angles θ1 and θ2 of 90 °), The contact area of the heel 40 with respect to the wearer can be adjusted, and the wearing feeling such as the fit, cushioning and touch to the wearer can be improved.
In addition, by changing the number of thread rubbers 20 intersecting the first welded portion 30A and / or the second welded portion 30B, the contact area of the heel 40 with respect to the wearer can be changed, and the wearing feeling can be easily adjusted. As the number of rubber threads increases, the contact area tends to decrease.
In addition, the degree of tightening and the flexibility of the tummy gathers 17A can be adjusted by increasing or decreasing the number of thread rubbers 20 crossing each other at the welded portions 30A, 30B.
Therefore, it is possible to provide the leaky water leakage prevention function to the Tammy gather 17A or to improve the feeling of wearing according to the age, sex, purpose and the like of the wearer.

  In the following, the dimensions a, b, c, d1, d2, i and the angles θ1, θ2 shown in FIG. 5C will be described. The dimensions a, b, c, d1, d2, i and the angles θ1, θ2 are measured in the stretched state of the thread rubber 20. That is, the dimensions a, b, c, d1, d2, i and the angles θ1, θ2 are measured in a state in which the sheet members 15a, 15b are stretched in the width direction W and there is no crease 40.

  The dimension a is a length dimension of the first welded portion 30A. Also, the dimension b is the length dimension of the second welded portion 30B. The dimensions a and b are not particularly limited as long as the bonding strength between the sheet members 15 a and 15 b and the thread rubber 20 is not insufficient. In FIG. 5, the dimensions a and b are both 5 mm.

  The dimension c is the pitch of the rubber threads 20, that is, the distance between adjacent rubber threads 20, 20 in the alignment direction L. If the dimension c is too small, the Tammy gather 17A may become hard. From such a viewpoint, the preferable range of the dimension c is 1 mm or more and 10 mm or less. In addition, in FIG. 5, the dimension c is 1.6 mm.

Dimension d1 is a distance between adjacent weld lines 30-1 and 30-2 closest to each other (minimum distance between each other in width direction W), and dimension d2 is an adjacent weld line 30-1 and 30- 2 is the distance between each other (the maximum distance between them in the width direction W). In FIG. 5, the dimension d1 is 4 mm and the dimension d2 is 6.6 mm.
The shape of the welding line 30 and the arrangement pattern of the welding lines 30 correspond to the shape and arrangement pattern of the ridges provided on the anvil roller 210 of the welding device 200 shown in FIG. 4. Therefore, if the dimensions d1 and d2 are too large, the distance of circumferentially separating the ridges of the anvil roller 210 corresponding to the plurality of welding lines 30 increases, so the sheet material 15a between the ridges and the horn 220 , 15b and the portion where the rubber thread 20 is pressurized, and the portion where the rubber rubber is not pressurized, the pressure is not uniform, which may cause troubles in operation. In addition, if the distance between the ridges is out of an appropriate range, resonance may occur and the anvil roller 210 and the horn 220 may vibrate. The bonding strength by the welding line 30 varies depending on the pressure applied between the anvil roller 210 and the horn 220 and the magnitude of the ultrasonic vibration input to the anvil roller 210, so that the dimensions d1 and d2 are from an appropriate range Bonding strength may become non-uniform if it is detached. Further, by setting the dimensions d1 and d2 in appropriate ranges, it is possible to improve the balance of air permeability and flexibility. From the above viewpoints, preferred ranges of the dimensions d1 and d2 are 3 mm or more and 10 mm or less, respectively.

  The dimension i is the width dimension of the welding line 30. The width dimension i is preferably 0.3 mm or more from the viewpoint of securing the bonding strength between the sheet materials 15 a and 15 b and the thread rubber 20. In FIG. 5, the dimension i is 0.6 mm.

Although the angles θ1 and θ2 are not particularly limited, a preferred range of the angles θ1 and θ2 is 45 ° or more and less than 90 °, more preferably 50 ° or more and 85 ° or less.
By setting the angles θ1 and θ2 in the above range, it is easy to adjust the contact area of the convex ridge 40 to the wearer. In other words, it is easy to adjust the fit, the cushioning property, and the feeling of feel such as the touch to the wearer. On the other hand, if the angles θ1 and θ2 are too small, the welding lines 30 become dense in the alignment direction L, and the ratio of the welded portions to the sheet members 15a and 15b increases, so the touch becomes hard and the flexibility decreases. There is something to do. Therefore, the angles θ1 and θ2 are preferably in the above ranges from the viewpoint of excellent balance of fit, cushioning property, bonding strength, feel and softness. In FIG. 5, the angles θ1 and θ2 are 85 °.

[2-2. Principal part configuration of manufacturing apparatus (pattern of convex line of anvil roller)]
The ridges of the anvil roller 210 according to the present embodiment will be described by taking one used for manufacturing the tummy gathers 17A as an example.
The welding line 30 of the Tammy gather 17A corresponds to the pattern to which the ridges of the anvil roller 210 of the present embodiment are transferred, and the pitch of the rubber thread 20 of the Tammy gather 17A is a yarn supplied to the outer peripheral surface of the anvil roller 210. It corresponds to the pitch of the rubber 20.

Accordingly, in FIG. 5, if the longitudinal direction L is replaced with the axial direction of the anvil roller 210 and the width direction W is replaced with the circumferential direction of the anvil roller 210, the pitch of the rubber thread 20 is the pitch of the rubber thread 20 supplied to the anvil roller 210. The shape and arrangement of welding line 30 indicate the shape and arrangement of the ridges of anvil roller 210, and the positional relationship between thread rubber 20 and welding line 30 is the relationship between the ridges of anvil roller 210 and yarn rubber 20. Indicates the positional relationship.
Accordingly, the dimensions a, b, c, d1, d2, i and the angles θ1, θ2 described with reference to FIG. 5C can be replaced as explanations of the various dimensions of the anvil roller 210.

[2-3. effect]
(1) According to the present invention, a novel gather 15 can be easily manufactured without using a hot melt material.
(2) By welding the two sheet materials 15a and 15b to each other and the thread rubber 20 and the sheet materials 15a and 15b with the welding wire 30 having a specific shape, the convex ridge 40 along the welding line 30 It is formed. According to such a convex ridge 40, compared with the convex ridge formed along the linear welding line (welding line with angles θ1 and θ2 of 90 °), Since the contact area is adjusted, it is possible to improve the fit, the cushioning property, and the wearing feeling such as the touch to the wearer.
(3) Further, by increasing or decreasing the number of thread rubbers 20 intersecting the first welded portion 30A and / or the second welded portion 30B, the contact area of the weir 40 can be changed to easily adjust the wearing feeling.
(4) Furthermore, the degree of tightening and the flexibility of the tummy gathers 17A can be adjusted by increasing or decreasing the number of thread rubbers 20 intersecting each other at the welded portions 30A, 30B. Therefore, it is possible to provide the leaky water leakage prevention function to the Tammy gather 17A or to improve the feeling of wearing according to the age, sex, purpose and the like of the wearer.

[2-4. Modified example]
The dimensions a, b, c, d1, d2 and i of the welding wire 30 and the angles θ1 and θ2 are not limited to those shown in FIG. 5C, but the dimensions a, b, c, d1 and d2, i and The angles θ1 and θ2 may be changed.
Moreover, each dimension a of several 1st welding part 30A in the welding line 30 may mutually differ. Similarly, the respective dimensions b of the plurality of second welds 30B in weld line 30 may be different from one another. Moreover, the mutual distances (dimension c) of the alignment direction L of the adjacent thread rubbers 20, 20 may be different from each other. Further, the mutual distances (dimensions d1, d2) of the plurality of welding lines arranged in parallel in the width direction W may be different from each other.

  Further, as shown in FIG. 6, the sheet materials 15a and 15b and the rubber thread 20 may be welded to the sheet materials 15a and 15b by one type of welding line 30 (30-1). Moreover, you may employ | adopt not only the welding wire of zigzag shape (triangular wave shape) but welding wire 30 'of a sine wave form as shown in FIG.

[3. Second embodiment]
[3-1. Composition of main parts of gather]
This embodiment will be described with reference to FIG. 8 by taking an example of the Tammy Gather 17 (hereinafter referred to as “tammy gather 17B”) as an example. In addition, about the component same as 1st embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

The tummy gathers 17B of this embodiment is not the structure where the 1st welding part 30A and the 2nd welding part 30B which comprise the welding wire 30 were alternately connected repeatedly repeatedly with respect to 1st embodiment, but the 1st welding The difference is that the portion 30A and the second welded portion 30B are connected at one end of each welded portion. In addition, one end of the first welded portion 30A and the second welded portion 30B, that is, the connection point Px with the welded portions 30A and 30B, is parallel to the other end Pz of the first welded portion 30A and the second welded portion 30B. They are located on opposite sides of the center line CL2 of the weld line 30 along L.
In the example shown in FIG. 8, the first welded portion 30A and the second welded portion 30B are provided continuously on the center line CL3 extending in the expansion / contraction direction W through the centers of the sheet members 15a and 15b, and the center line The connection point Px is located on CL3. FIG. 8 shows an example in which the angle θ1 and the angle θ2 are equal. Θ1 and θ2 in FIG. 8 are 80 °. The shape of the welding line 30 configured in this way is a "C-shaped" or "C-shaped" in which the welded portions 30A and 30B are reversed at the center line CL3. In addition, below, the welding wire 30 of "A character shape" is described as "welding wire 30-3", and the welding wire 30 of "the reverse character shape" is described as "welding wire 30-4."

In addition, the tummy gathers 17B of the present embodiment has a first welding pattern 300A composed of at least two adjacent welding lines 30-3 and a second welding line-symmetrical to the first welding pattern 300A with respect to the first embodiment. It differs from the pattern 300B in that the patterns 300B are arranged in parallel along the expansion / contraction direction W. That is, the first welding pattern 300A and the second welding pattern 300B are line symmetrical with respect to a center line (CL4 in FIG. 8) extending in the alignment direction L. In addition, the second welding pattern 300B includes at least two adjacent welding lines 30-4.
In the example shown in FIG. 8, the first welding pattern 300A and the second welding pattern 300B are made to be line symmetrical with each other with respect to the center line CL4 passing through the centers of the sheet members 15a and 15b and extending in the alignment direction L. Is arranged. Due to the shape of the welding lines 30 and the arrangement of welding patterns, a region S1 without welding lines is formed in the central region between the first welding pattern 300A and the second welding pattern 300B, and the sheet material In the end regions in the width direction W and the longitudinal direction L of 15a and 15b, a region S2 having no welding line is formed.

Similar to the first embodiment, in FIG. 8, if the line direction L is replaced with the axial direction of the anvil roller 210 and the width direction W is replaced with the circumferential direction of the anvil roller 210, the pitch of the thread rubber 20 in FIG. The shape / arrangement of -3 and 30-4, and the positional relationship between the rubber thread 20 and the welding lines 30-3 and 30-4, the pitch of the rubber thread 20 supplied to the anvil roller 210, the height of the ridges of the anvil roller 210 The shape and the positional relationship between the ridges of the anvil roller 210 and the rubber thread 20 are shown as they are.
The other configuration is the same as that of the first embodiment, so the description will be omitted.

[3-2. effect]
(1) According to the present invention, a novel gather 15 can be easily manufactured without using a hot melt material.
(2) By welding the two sheet materials 15a and 15b to each other and the thread rubber 20 and the sheet materials 15a and 15b with the welding wire 30 having a specific shape, the convex ridge 40 along the welding line 30 It is formed. The area where the convex ridges 40 are formed (welded area) reduces the contact area of the ridges 40 to the wearer as compared with the areas S1 and S2 (non-welded areas S1 and S2) without the welding line 30 Therefore, it is possible to adjust the fit, the cushioning property, and the wearing feeling such as the touch to the wearer by the welding line 30. In addition, in the non-welding regions S1 and S2, the flexibility of the Tammy gather 17B is excellent. Therefore, by the arrangement of the welding area and the non-welding area S1, S2, that is, the arrangement of the welding line 30, the balance between the fit for the wearer, the cushioning property and the wearing feeling such as the touch and the flexibility can be improved. it can.
(3) Further, by arranging the welding line 30 so that the region S1 is located on the extension along the longitudinal direction L of the absorber 10, the air permeability of the absorber 10 is improved. As a result, volatilization of the excrement water held by the absorber 10 is promoted, and the comfort of the wearer is improved.
(4) The welded portion where the sheet members 15a and 15b or the sheet members 15a and 15b and the thread rubber 20 are joined by the welding wire 30 becomes harder and softer than the non-welded portion (non-welded portion). It may decrease. When manufacturing the paper diaper 1, since the width direction end edge parts 14a shown in FIG. 1 are affixed, when the welding line 30 overlaps with the width direction end edge part 14a, a softness may fall further. According to the tummy gathers 17B, since the area S2 without the welding line 30 is formed due to the shape of the welding line 30, overlapping of the width direction edge portion 14a and the welding line 30 is suppressed. Therefore, the flexibility of the Tammy gather 17B is excellent.
(5) According to the present embodiment, the stretching state of the rubber thread 20 is different between the end region in the longitudinal direction L of the tummy gather 17B and the central region in the longitudinal direction L due to the shape of the weld line 30. The tightening condition of the tummy gather 17B is adjusted. Therefore, the feeling of wearing can be adjusted locally, and according to the age, sex, purpose, etc. of the wearer, it becomes possible to provide the leaky water leakage preventing function to the Tummy gather 17A or to improve the feeling of wearing .

[3-3. Modified example]
As in the first embodiment, the dimensions a, b, c, d1, d2 and i of the welding wire 30 and the angles θ1 and θ2 are not particularly limited, and the dimensions a, b, c, d1, d2, i and The angles θ1 and θ2 may be changed.
Alternatively, a plurality of first welding patterns 300A and a plurality of second welding patterns 300B may be alternately arranged.
Further, as shown in FIG. 9, the arrangement positions of the first welding pattern 300A and the second welding pattern 300B may be reversed horizontally.

  Moreover, you may employ | adopt not only the V-shaped or reverse-shaped welding line but welding-wire 30 '' of circular arc shape, as shown in FIG.

[4. Other]
In the above embodiment, although the composite stretchable member of the present invention is applied to the Tammy gather 17, it can be applied to the solid gather 16 or the second solid gather 18, and can also be applied to places requiring expansion and contraction other than gather.

The above-described stretchable member is applicable to gathers provided in various absorbent articles such as tape-type disposable diapers, urine pads, sanitary napkins, and panty liners, in addition to the illustrated pants-type disposable diapers.
Instead of or in addition to the rubber thread 20 used for the stretchable member, a stretchable film (elastic member) may be used. In this case, as in the case of the above-described yarn rubber 20, a coating layer with a low melting point is provided on the outer periphery of the film.

1 Paper diapers 15 Gather (composite elastic member)
15a, 15b Sheet material 16 solid gathers (composite stretchable member)
17, 17A, 17B Tammy gather (composite elastic member)
18 Second Solid Gather (Composition Telescopic Member)
20 Thread rubber (elastic member)
30, 30 ', 30''welding line 30A first welding part 30B second welding part 300A first welding pattern 300B second welding pattern 40 溶 着 L longitudinal direction (arrangement direction of thread rubbers 20)
W width direction (stretching direction of thread rubber 20)

Claims (2)

Two sheet members and a plurality of elastic members juxtaposed in a row direction crossing the expansion / contraction direction between the sheet members are formed to intersect each of the plurality of juxtaposed elastic members A composite stretchable member welded by a plurality of welding lines, wherein
The welding line is
A first welded portion inclined to one side in the expansion and contraction direction;
And a second welding portion that is inclined to the other side in the expansion and contraction direction is alternately provided.
The first welded portion and the second welded portion respectively intersect at least two of the elastic members.
Composite elastic member. Two sheet members and a plurality of elastic members juxtaposed in a row direction crossing the expansion / contraction direction between the sheet members are formed to intersect each of the plurality of juxtaposed elastic members A composite stretchable member welded by a plurality of welding lines, wherein
The welding line is
A first welded portion inclined to one side in the expansion and contraction direction;
And a second welding portion that is inclined to the other side in the expansion and contraction direction is continuously provided,
Each of the first welding portion and the second welding portion intersects at least two of the elastic members,
A first welding pattern comprising at least two adjacent welding lines;
The composite expansion-contraction member by which the said 1st welding pattern and line-symmetrical 2nd welding pattern were arranged in parallel along the said expansion-contraction direction.

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