JPH0531135A - Production of disposable underpants - Google Patents

Abstract

PURPOSE:To mass-produce disposable underpants with a relatively complicated structure which have a pair of flaps rising up to the skin side of a user. CONSTITUTION:All the constitutional raw materials of underpants are continuously carried in a fixed direction along a production line of the underpants but after a continuous laminated body contg. a flap 103 is formed by laminating other continuous raw materials except for a continuous raw material 113 for a back sheet of the underpants. This continuous laminated body is cut into width dimensions of individual underpants to form pieces of the laminated bodies and the directions of these pieces of the laminated bodies are changed by 90 deg. and are laminated on the continuous raw material for a back sheet to constitute a final continuous laminated body 126. This final continuous laminated body is folded through a central line 105 in the longer direction and this folded final continuous laminated body is bonded at a specified part to form individual underpants, which are then separated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to disposable pants, and more particularly, to a method for manufacturing pants-type diapers and training pants for infants.

[0002]

2. Description of the Related Art The applicant of the present invention is disclosed in Japanese Patent Application Laid-Open No. 1-167.
Japanese Patent No. 224 discloses a method for manufacturing disposable pants. According to the manufacturing method, disposable pants can be mass-produced at low cost.

[0003]

However, in order to prevent the excrement from leaking through the leg openings of the pants, elastic flaps are provided on both sides of the inner surface of the pants, and flaps that rise to the wearer's skin are provided. When manufacturing things, a difficult problem occurs, but the above-mentioned technology and other known technologies do not point out that there is a problem. This is rather natural in view of the fact that the above-mentioned technology is intended for the pants that have no particular difference from the conventionally known pants in the basic structure itself.

Here is a difficult problem. That is, in order to mass-produce disposable pants at a low cost, all the constituent materials of the pants are stacked while being transferred in the same direction as the pants manufacturing line, and, in the vicinity of the final process of the manufacturing, the processes are completed by that process. The folded continuous laminate is folded along its longitudinal centerline and then the folded state is joined along the side edges to define the side edges of the individual pants in the continuous laminate. It is indispensable to construct a plurality of connected pants and separate individual pants from the connected pants in the final step, but when manufacturing pants with the flap, all of the pants are If the components are transported in the same direction as the pants production line, such pants cannot be produced. This will be understood more clearly from the following description of the present invention.

Therefore, in the present invention, it is necessary to change the direction of a part of a certain constituent material of the pants to a direction perpendicular to the manufacturing line direction of the pants and position it in the manufacturing line direction. In which step, if so, it is possible to manufacture pants with the same high efficiency as in the method for manufacturing pants according to the above technique.

[0006]

SUMMARY OF THE INVENTION The method of the present invention for solving the above-mentioned problems, in a very simple manner, continuously transfers all the constituent materials of the pants in a certain direction along the pants production line. However, after the continuous material other than the continuous material for the back sheet of the pants (including the absorbent panel which is formed in advance and spaced apart) is laminated to form a continuous laminated body including a flap, the continuous laminated body The body is cut into the width dimension of individual pants to form laminated pieces, and the laminated pieces are turned by 90 degrees with respect to the moving direction of the continuous laminated body and stacked on the continuous material for the back sheet. A final continuous laminated body is formed, the final continuous laminated body is folded along the center line in the longitudinal direction, and predetermined parts of the folded final continuous laminated body are joined to define individual pants. Then disconnect.

More specifically, the present invention includes the following steps.

[0008] The first continuous web is moved in a constant direction, and the first continuous elastic members A and 1B are supplied to the central area of the upper surface of the first continuous web in a lengthwise direction thereof. And the first B continuous elastic member is curved and adhered so as to form the remaining approximately half circumference of the annular shape to form an annular elastic portion, and the annular elastic portion is formed in the longitudinal direction of the upper central region. Arrange at regular intervals.

Supplying and adhering the second continuous elastic members to the upper surface of the first continuous web in the vicinity of both side edges of the first continuous web in a longitudinal direction.

Each of the annular elastic portions adjacent to each other,
Absorbing panels are arranged at predetermined intervals in the longitudinal direction in the central region of the upper surface of the second continuous web that has a width dimension that is equal to the spacing dimension of the center lines in the width direction of the first continuous web and that moves in the constant direction. To form a first continuous laminate.

A third continuous web is superposed on and bonded to the upper surface of the first continuous laminate moving in the predetermined direction, and the absorbent panel is covered to form a second continuous laminate.

The third continuous elastic member is extended along the inner edges of the pair of fourth continuous webs, each of which has a width dimension less than or equal to one half of the width dimension of the second continuous web and moves in the predetermined direction. Supply and glue to.

The pair of fourth continuous webs are supplied to the upper surface of the second continuous laminate so that their inner edges are separated from each other in the width direction of the second continuous laminate, and the outer sides of the fourth continuous webs are supplied. A part is joined to both sides of the upper surface of the second continuous laminate to form a third continuous laminate.

The third continuous laminated body is cut in the widthwise direction between each of the absorbent panels adjacent to each other in a tensioned state to form a laminated body piece, and the laminated body piece under the tensioned state is aforesaid. The first continuous web and the third continuous laminated body are swung by 90 degrees with respect to the moving direction, and the lower surface of the swung laminated piece under the tensioned state is the center of each of the adjacent annular elastic portions. Forming a fourth continuous laminated body by superposing on the upper surface of the first continuous web so as not to substantially protrude from the line.

Folding the fourth continuous laminated body through the center line in the longitudinal direction so that the upper surface of the laminated body is located on the inner surface.

Joining the folded fourth continuous laminate along both side edges between the boundary lines of the adjacent laminate pieces.

Cutting the fourth continuous laminated body joined along both side edges of the boundary line along the boundary line.

After the fourth continuous laminated body is formed, a part of the fourth continuous laminated body surrounded by the annular elastic portion is cut off until the fourth continuous laminated body is cut on the boundary line. To form the leg opening.

In a preferred embodiment, the first continuous web is a stretchable and longitudinal stretchable breathable fibrous nonwoven fabric, and the second continuous web is a longitudinally and transversely stretchable breathable plastic or rubber film. The absorbent panel is formed of a mixture of crushed pulp, superabsorbent polymer particles, and thermoplastic synthetic fibers, the third continuous web is a liquid-permeable fibrous nonwoven fabric, and the fourth continuous web is repellent. An aqueous and breathable fibrous nonwoven fabric is used, and a material exhibiting rubber elasticity is used for each of the continuous elastic members. However, in some cases,
The first continuous web may be a longitudinal or transverse elastic breathable plastic or rubber film, and the second continuous web may be a longitudinal or transverse elastic breathable fibrous nonwoven fabric.

[0020]

Embodiments of the manufacturing method according to the present invention will be described below with reference to the drawings.

1 and 2, disposable pants produced by the method of the present invention are shown. In the pants 1, a pair of side flaps 3 are attached to a vertically long laminated body 2 of each constituent member, and leg opening recessed portions 4 are formed on both side edges of the laminated body 2. Fold it in two through the lateral centerline 5 so that it is located at, and apply intermittent joining lines 8 near the both side edges of the front and rear waist regions 7a, 7b of the laminate 2 excluding the recessed portions 4. Thus, a pair of leg openings 9 and a trunk opening 10 are formed.

3 and 4, the pants 1 includes an outer sheet 13 to which an elastic member 11 for the leg opening and an elastic member 12 for the trunk opening are attached, respectively, and the outer sheet 1
The absorption sheet 16 is arranged in the central area of the upper surface of the back sheet 15 composed of the inner sheet 14 stacked on the upper surface of the top sheet 3 and the width of the top sheet 17 is smaller than that of the back sheet 15.
The absorbent panel 16 is covered with the both sides of the topsheet 17 to the both sides of the backsheet 15, and the outer side portions of the pair of side flaps 3 having elastic members 18 extending and contracting on the inner edges are attached to the backsheet 15. It is configured by being joined to the outer portions respectively. Although not shown, the facing surfaces of the outer sheet 13 and the inner sheet 14, the facing surface of the inner sheet 14 and the absorbing panel 16, and the facing surface of the absorbing panel 16 and the top sheet 17 are not shown in the drawing. Join in a shape. The recessed portions 4 are formed on the outer edges of the side flaps 3 and the back sheet 15.

The elastic member 11 at the leg opening is composed of the members 11A,
It consists of 11B. These members 11A and 11B are
Each is made up of a plurality of thread-like rubbers, and the central portion 11
a and both side extended portions 11b along the recessed portion 4 and the both side extended portions 11b are provided with the back sheet 15 under the required rate of extension.
Are bonded to each other with an adhesive (not shown), and have a contraction force necessary to give a gather to the bonded portion. As will be described later, the central portion 11a is not adhered to the back sheet 15 with an adhesive and does not have a contracting force like the two-sided extending portions 11b, but has a slight contracting force, By cutting so as to be separated from each other and contracting (snapback) itself, it is possible to prevent it from lying between the two side extending portions 11b. The elastic member 12 for the body opening is also made of a plurality of threads of rubber and is adhered to the back sheet 15 with an adhesive (not shown) while being stretched at a required ratio. The flap elastic member 18 is made of a single thread of rubber and is adhered to the vicinity of the inner edge of the flap 3 with an adhesive (not shown) while being stretched by a required ratio, and is covered with the inner edge.

The outer sheet 13 is made of a vertically and horizontally stretchable and breathable fibrous nonwoven fabric, the inner sheet 14 is made of a vertically and horizontally stretchable and breathable liquid-impermeable plastic or rubber film, and the absorbent panel 16 is made of a film. A molded product made of a mixture of crushed pulp, superabsorbent polymer particles, and thermoplastic synthetic fiber, a liquid-permeable fibrous nonwoven fabric for the top sheet 17, and a water-repellent and breathable fibrous nonwoven fabric for each flap 3. Elastic member 11,
In addition to rubber, 12 and 18 are made of a plastic material exhibiting rubber elasticity. However, in some cases, the outer sheet 13 may be made of a longitudinal or laterally stretchable and breathable plastic or rubber film, and the inner sheet 14 may be made of a longitudinally or transversely stretchable and breathable fibrous nonwoven fabric.

5 to 12 show main steps for manufacturing the pants 1 according to the present invention. In the following description, it should be understood that all the constituent materials of the pants 1 are moved on the manufacturing line of the pants 1 to the final process of manufacturing the pants 1.

In FIG. 5, the first continuous web 113, which is the material of the outer sheet 13 and has the width dimension corresponding to the length of the laminate 2, is centered at predetermined intervals in the length direction. A hot-melt type adhesive is applied to the area to provide an elliptic ring-shaped adhesive area 119 that is slightly long in the width direction. Also,
A hot-melt type adhesive is applied along both sides of the first continuous web 113 in the length direction to provide a straight adhesive area 120.

On the other hand, the first continuous web 113, which is the material of the elastic member 11 for the leg opening described above, and each of which has three first A and first B continuous elastic members 111A and 111B stretched at a required rate. The adhesive regions 119 are provided in a sine curve shape while being provided along substantially half of each adhesive region 119 and intersecting between the adjacent adhesive regions 119.
The respective parts of the elastic members located at are bonded. The portions of the elastic members thus bonded are annular elastic portions 111b.
And the other portions 111a of the first A and first B continuous elastic members 111A and 111B are located between the annular elastic portions, but no adhesive is applied to those positions, so that FIG. As shown in the central portion 11a, they are close to each other and almost relaxed. However, a slight contracting force remains in the portion 111a, and although not shown, by cutting so as to be separated from each other on both sides of the adjacent annular elastic portions 111b and contracting (snapback) itself, It is possible not to lie between the annular elastic portions 111b. In addition, as the material of the elastic member 12 for the trunk opening described above, each of the three second continuous elastic members 112 is
The first continuous web 113 is bonded along the bonding areas 120 of the first continuous web 113 while being stretched to a required ratio.

1A and 1B continuous elastic members 111A,
To supply 111B in a sinusoidal shape, traverse means for supporting each can be used, for example, as disclosed in Japanese Patent Application Laid-Open No. 1-167224 by the applicant.

An annular elastic portion 111 is formed on the first continuous web 113.
1A and 1B continuous elastic member 11 so as to form b
In order to bond 1A and 111B, the first continuous web 113 is not provided with the adhesive zone 119 as described above, but only the portions where the annular elastic portions 111b are formed by the continuous elastic members, that is, the continuous elastic members. It is possible to directly apply the hot-melt adhesive at a predetermined interval in the length direction of.
Each of the second continuous elastic members 112 can also be directly coated with a hot melt adhesive and adhered to the continuous web 113.

In FIG. 6, the material of the above-mentioned inner sheet 14 and of both annular elastic portions 111b adjacent to each other,
The absorbent panels 16 are provided at predetermined intervals in the longitudinal direction in the central region of the second continuous web 114 having a width dimension W substantially corresponding to the interval dimension S of the widthwise centerlines 121 in the first continuous web 113. To form the first continuous laminate 122.

In FIG. 7, a third continuous web 117, which is a material of the above-mentioned top sheet 17 and has a width dimension smaller than that of the second continuous web 114, is provided on the upper surface of the first continuous laminate 122. The absorption panel 16 is overlapped so as to cover it, and at least both sides thereof are overlapped with the first continuous laminate 122.
The second continuous laminated body 123 is formed by joining the both sides of the same with a hot melt adhesive (not shown).

In FIG. 8, the pair of fourth side flaps 3 are made of the above-mentioned pair of side flaps 3 and have a width dimension that is less than or equal to one half of the width dimension of the second continuous web 114.
The third continuous elastic member 11 is provided near the inner edge of the continuous web 103.
8 is stretched and bonded with a hot melt type adhesive (not shown), and the inner edges thereof are folded back to cover the continuous elastic members.

A pair of fourth continuous webs 103 are provided on both sides of the upper surface of the second continuous laminate 123 in the length direction, and inner edges of the fourth continuous webs are separated from each other in the width direction of the second continuous laminate 123. As described above, and the outer portions of the fourth continuous webs are joined with a hot melt adhesive (not shown) to form a third continuous laminate 124. Then, although not shown, the third continuous laminate 124 is placed on the center line 125 between each of the adjacent absorption panels 16 under tension by the suction device arranged in the moving range of the third continuous laminate 124. Along the width direction, the laminate piece 126 is formed (see FIG. 10).

In FIG. 10, the third continuous laminated body 12 is shown.
The laminated piece 126 under the tension condition received by the turning device arranged in the moving area of No. 4 is turned by 90 degrees with respect to the moving direction of the first continuous web 113 and the third continuous laminated body 124. Although not shown, this swivel device can also be used, for example, a device having a suction holding portion swiveled by a cam mechanism. With this suction holding portion, the laminated piece 126 can be held in a tensioned state so as not to contract due to the contracting force of the elastic member 118.

In FIG. 11, as described above, the lower surface of the laminated piece 126 which is rotated by 90 degrees and is in a tensioned state is not substantially projected from the center lines 121 of the annular elastic portions 111b adjacent to each other. The fourth continuous laminated body 127 is formed by sequentially stacking on the upper surface of the first continuous web 113.

Further, in FIG. 11, the annular elastic portion 111
A part 128 of the fourth continuous laminate 127 surrounded by b is cut off to form the leg opening notch 4 described above.

In FIG. 12, the lengthwise center line 1 of the fourth continuous laminate 127 is arranged so that its upper surface is located on the inner surface.
05 (see FIG. 11).

Further, in FIG. 12, the joining line 8 is intermittently ultrasonically welded along the both side edges of the boundary line 121 between the laminate pieces 126 adjacent to each other to the folded fourth continuous laminate body 127. The continuous pants 101 are formed by applying and joining.

Furthermore, in FIG. 12, continuous pants 1
01 is cut on the boundary line 121 to obtain the individual pants 1 shown in FIG.

The leg opening notch 4 or the leg opening 9 forms a fourth continuous laminate 127, and then the boundary line 12 is formed.
A part 12 of the fourth continuous laminated body 127 surrounded by the annular elastic portion 111b until the step of cutting on 1
8 can be excised and formed, and is not limited to its formation in the process of the embodiment.

The constituent materials of the pants described above are the same as the materials already described for the pants in FIGS. 1 to 4, and the same applies to the necessary joining of the materials.

[0042]

As can be understood from the above description, the method of the present invention is, in short, a continuous web for the back sheet of the pants and the continuous elastic members for the leg openings and the trunk opening of the pants. While attached for so-called stripping, other pant continuous materials, including continuous pant flap materials, but including preformed and spaced absorbent panels, are laminated and the continuous laminate is After cutting into laminate pieces that are pants, and stacking the laminate pieces on a continuous web for the back sheet to form a final continuous laminate, the final continuous laminate is cut along the longitudinal center line. After being folded over, predetermined portions of the final folded continuous laminate are joined so as to form the side edge joining lines of the individual pants, and then the individual pants are separated.

Therefore, according to the method of the present invention, each continuous elastic member for the leg opening and the trunk opening is provided as a back sheet so that the pants can be so-called laterally taken from the constituent material of the pants for the pants manufacturing line. Can be mass-produced continuously with a manufacturing apparatus, even though it is attached to a continuous web for use and a pants is produced in which flaps are arranged so that the direction of movement of the continuous web is different by 90 degrees. .

By the way, when the final continuous laminated body of the pants is cut into individual pants, it is folded in two and both side edges of the pants are joined to each other. Includes elastic members for different leg openings, torso openings and flaps, which are deformed indefinitely by the contraction force of those elastic members, so that both side edges of pants should be aligned and joined. Not only will it become extremely difficult, but it will also be difficult to continuously carry out mass production at low cost.

[Brief description of drawings]

FIG. 1 is a perspective view of disposable pants to be manufactured by the method of the present invention.

FIG. 2 is a perspective view of an inner surface of the underpants which is torn and developed at both side edges.

3 is a cross-sectional view taken along the widthwise central portion of the pants shown in FIG.

FIG. 4 is an exploded perspective view of the pants.

FIG. 5 is a partial plan view of a first continuous web in which elastic members for leg and waist are attached.

FIG. 6 is a partial plan view of the first continuous laminate.

FIG. 7 is a partial plan view of a second continuous stack.

FIG. 8 is a partial plan view of a fourth continuous web.

FIG. 9 is a partial plan view of a third continuous stack.

FIG. 10 is a plan view of a laminate piece.

FIG. 11 is a partial plan view of a fourth continuous stack.

[FIG. 12] Folding the fourth continuous laminated body through the center line in the length direction and applying a joining line in the width direction thereof,
The partial top view which comprised the connection pants.

[Explanation of symbols]

1 pants 4 Notch for leg opening 8 joining line 9 leg openings 10 trunk opening 16 absorption panel 103 4th continuous web 113 First continuous web 114 Second continuous web 117 Third continuous web 122 first continuous laminate 123 Second continuous laminate 124 Third continuous laminate 126 laminated pieces 127 Fourth continuous laminate 128 Part to be resected

Claims (3)

[Claims] 1. A method of manufacturing disposable pants including the following steps. a. The first continuous web which moves in a constant direction is supplied to the central area of the upper surface of the first continuous web in the lengthwise direction thereof while being stretched, and the first continuous web forms a substantially half circumference of an annular shape. Further, the first B continuous elastic member is curved and adhered so as to form the remaining approximately half circumference of the annular shape to form an annular elastic portion, and the annular elastic portion is spaced at predetermined intervals in the longitudinal direction of the upper central region. Arrange with. b. Supplying and adhering the second continuous elastic members to the upper surface of the first continuous web in the vicinity of both side edges in the lengthwise direction while extending. c. The first of each of the annular elastic portions adjacent to each other
The width dimension of the continuous web is equal to the distance between the center lines in the width direction of the continuous web, and the absorption panels are arranged at predetermined intervals in the length direction in the central area of the upper surface of the second continuous web that moves in the predetermined direction. To form a continuous laminate. d. A third continuous web is superposed on and bonded to the upper surface of the first continuous laminate moving in the predetermined direction, and the absorbent panel is covered to form a second continuous laminate. e. A pair of fourth moving members each having a width dimension less than or equal to one half of the width dimension of the second continuous web and moving in the predetermined direction.
Feeding and adhering a third continuous elastic member under stretching along the inner edge of the continuous web. f. The pair of fourth continuous webs are supplied to the upper surface of the second continuous laminate so that their inner edges are separated from each other in the width direction of the second continuous laminate, and the outer portions of the fourth continuous webs are separated from each other. Bonding to both sides of the upper surface of the second continuous laminated body to form a third continuous laminated body. g. The third continuous laminated body is cut in the width direction between the adjacent absorption panels in a tensioned state to form a laminated body piece, and the laminated body piece in the tensioned state is formed into the first continuous body. The lower surface of the laminated piece, which is rotated by 90 degrees with respect to the moving direction of the web and the third continuous laminated body and is in the tensioned state, is substantially the center line of each of the annular elastic portions adjacent to each other. To form a fourth continuous laminated body by being superposed on the upper surface of the first continuous web so as not to protrude. h. Folding the fourth continuous laminated body through the center line in the longitudinal direction so that the upper surface is located on the inner surface. i. Joining the folded fourth continuous laminate along both side edges of a boundary line between each of the adjacent laminate pieces. j. Cutting the fourth continuous laminated body joined along both edges of the boundary line on the boundary line. k. After forming the fourth continuous laminate in the step g, up to the step j, a part of the fourth continuous laminate surrounded by the annular elastic portion is cut off to form a leg opening. . 2. A longitudinally and laterally stretchable and breathable fibrous nonwoven fabric for the first continuous web, and a vertically and horizontally stretchable and breathable plastic or rubber film for the second continuous web,
The absorbent panel is formed of a mixture of crushed pulp, superabsorbent polymer particles, and thermoplastic synthetic fibers, the third continuous web is a liquid-permeable fibrous nonwoven fabric, and the fourth continuous web is repellent. The manufacturing method according to claim 1, wherein a water-permeable and air-permeable fibrous nonwoven fabric is used, and a material exhibiting rubber elasticity is used for each of the continuous elastic members. 3. A longitudinally and transversely stretchable breathable plastic or rubber film for the first continuous web, and a longitudinally and transversely stretchable breathable fibrous nonwoven fabric for the second continuous web.
The manufacturing method according to claim 1, wherein the absorbent panel, the third continuous web, the fourth continuous web, and the continuous elastic members are the same as those described in claim 2.