JP3616735B2 - Method for producing apertured sheet for use in disposable diapers - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing an opening sheet for forming an elastic stretchable opening on an upper surface of a top sheet of a disposable diaper.
[0002]
[Prior art]
Japanese Patent Laid-Open No. 5-305109 discloses a method of forming an elastic opening extending annularly inside a disposable diaper. The method disclosed in the publication includes the following first to fifth steps.
[0003]
In the first step, the first and second elastic members are joined by traverse means so that peaks and valleys are formed along the longitudinal direction in the central region of the first web to form a first composite web. At this time, the peak of the first elastic member faces the center of the valley of the second elastic member, and the peak of the second elastic member faces the center of the valley of the first elastic member.
[0004]
In the second step, a second web that is narrower than the width of the first composite web is joined along the joining surface area of the first and second elastic members in the first composite web to form a second composite web.
[0005]
In the third step, the second composite web between the first and second elastic members facing and juxtaposed in the width direction of the second composite web is cut along the insides of the crests and troughs of the elastic members, A 3B composite web member is formed.
[0006]
In the fourth step, the third A and third B composite web members are relatively shifted so that an opening is formed between the third A composite web member and the third B composite web member. The crests and troughs of each web member are aligned symmetrically in the width direction of the composite web member. Thereafter, the inner edges of the opposing ridges of the 3A and 3B composite web members are overlapped and joined.
[0007]
In the fifth step, the 3A and 3B composite web members are cut in the width direction along a virtual cutting line located at the center between the crests of the web members.
[0008]
A diaper having an annular elastic opening can be obtained by superimposing the 3A and 3B composite web members produced in the first to fifth steps on the upper surface of each diaper web.
[0009]
[Problems to be solved by the invention]
In the method disclosed in the publication, when the first and second elastic members are joined to the first web, it is necessary to use a traverse means so that peaks and valleys are formed in the elastic members, and the diaper Traverse means must be introduced into the manufacturing process. Moreover, in order to form an opening between the 3A web composite member and the 3B composite web member, it is necessary to shift at least one of the 3A and 3B composite web members in the machine direction. There is a problem that the production amount of diapers per unit time in production is restricted.
[0010]
The subject of this invention is providing the method which can manufacture efficiently the opening sheet | seat for forming the elastic-stretchable opening above the surface sheet of a disposable diaper, without using a traverse means.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, the present invention presupposes a method for manufacturing an opening sheet that is positioned on the upper surface of a liquid-permeable surface sheet of a disposable diaper.
[0012]
Under such assumptions, the present invention is characterized by:
(A) A pair of continuous sheets having both side edges extending in parallel with each other in the longitudinal direction are continuously fed forward in the longitudinal direction, and a pair of continuous elastic elastic members are stretched forward in the longitudinal direction. Supplying continuously, and stacking each of the elastic members near one side edge of each of the continuous sheets;
(B) bending the vicinity of one side edge of each of the continuous sheets to cover the elastic member, and attaching each of the elastic members to each of the continuous sheets in an extended state;
(C) a step of superimposing the sheet surfaces of the continuous sheets on each other in a state in which one side edge of each of the continuous sheets to which the elastic member is attached is aligned with each other;
(D) A predetermined dimension apart from the longitudinal direction and parallel to the longitudinal direction, and extending from one side edge of the continuous sheet in the width direction intersecting the longitudinal direction, to one side edge of the continuous sheet A step of joining the sheet surfaces of each of the continuous sheets while maintaining the stretched state of the elastic member in a joining region that does not reach the opposing other side edge;
(E) a first cut line that extends in the width direction from one side edge of the continuous sheet in the width direction and does not divide the continuous sheet; and the both sides following the first cut line The length extending forward and rearward in the longitudinal direction so as to be parallel to the edge, and the dimension extending from the first cut line to either the front or rear in the longitudinal direction is more than half of the separation dimension of the joining area. A step of making a cut in each of the continuous sheets with a second cut line that is short and has an extended end located between both side edges of the continuous sheet;
(F) The other side edges of the continuous sheet are expanded outward in the width direction, and each of the continuous sheets is separated from a virtual line connecting ends of the second cut lines adjacent to the second cut lines. The opening having a peripheral wall part that reaches one side edge, a base side part that reaches the other side edge of each of the continuous sheets from the second cut line and the virtual line, and an opening part surrounded by the peripheral wall part Obtaining a continuous sheet,
It is in having.
[0013]
As an example of an embodiment of the method, the step (f) includes a step of cutting the continuous sheet of the opening sheet along a cutting line that crosses between the peripheral wall portions in the width direction.
[0014]
As another example of the embodiment of the method, after the step (f), the liquid-permeable continuous surface sheet having a width dimension capable of closing the opening of the opening sheet is moved forward in the longitudinal direction. The sheet surface of the topsheet on the sheet surface opposite to the sheet surface from which the peripheral wall portion of the opening sheet extends so that the topsheet can block the bottom of the opening of the opening sheet. The sheet of the opening sheet that overlaps with each other in the vicinity of the second cut line and the base side portion of the opening sheet while maintaining the stretched state of the elastic member and the expanded state of the opening sheet A step of joining the surface and the sheet surface of the topsheet, and a step of cutting a continuous body of the opening sheet and the topsheet at a cutting line that crosses between the adjacent peripheral wall portions in the width direction.
[0015]
As another example of the embodiment of the method, after the step (f), the peripheral wall portion extends by reversing the peripheral wall portion to a sheet surface opposite to the sheet surface from which the peripheral wall portion of the opening sheet extends. A step of reversing the direction, a step of continuously feeding the liquid-permeable continuous surface sheet having a width dimension capable of closing the opening of the opening sheet to the front in the longitudinal direction, and the surface sheet A step of superimposing a sheet surface of the top sheet on a sheet surface opposite to a sheet surface from which a peripheral wall of the opening sheet extends so as to close a bottom of the opening of the opening sheet; and an extended state of the elastic member The step of joining the sheet surface of the opening sheet and the sheet surface of the top sheet that overlap each other in the vicinity of the second score line and the base side portion of the opening sheet while maintaining the expanded state of the opening sheet. Includes a step of between said peripheral wall adjacent cutting the continuous body of the opening sheet and the topsheet along the line crossing to the width direction.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
The details of the method for manufacturing an aperture sheet according to the present invention will be described with reference to the accompanying drawings.
[0017]
FIG. 1 is a perspective view showing an example of an opening sheet 1 manufactured by a manufacturing method described later. The opening sheet 1 is used for a disposable diaper 20 (see FIG. 6) to be described later, and includes a peripheral wall portion 2 that extends in an annular shape, a base portion 3 that is located at a lower portion of the peripheral wall portion 2 and extends in the longitudinal direction, and a peripheral wall And an opening 4 surrounded by the portion 2. An elastic stretchable member 5 is attached to the upper part of the peripheral wall 2 under extension in a state where a part of the peripheral wall 2 is covered. On the sheet surface opposite to the sheet surface from which the peripheral wall portion 2 of the opening sheet 1 extends, a liquid-permeable surface sheet is positioned and closes the bottom 4 a of the opening 4. In the figure, the stretched state of the elastic member 5 is released, the peripheral wall portion 2 rises upward in the drawing, and a gather is formed on the upper portion of the peripheral wall portion 2.
[0018]
2 and 3 are a process diagram showing an example of the manufacturing method of the aperture sheet 1, and a process diagram of the manufacturing method of the aperture sheet 1 continued from FIG. 2, wherein (1) shows a side view of the process, (2 ) Shows a plan view of the process. The side view of FIG. 2 continues from the arrow (1) to the arrow (1) of FIG. 3, and the plan view of FIG. 2 continues from the arrow (2) to the arrow (2) of FIG. 4 and 5 are a perspective view of the sixth step (f) and a perspective view of the seventh step (g) in the plan view of FIG.
[0019]
In the production line having the first step (a) to the tenth step (j), the opening sheet 1 includes a pair of first and second continuous sheets S1 and S2, a pair of elastic members 5, and a top sheet 6. Manufactured using. The sheets S1, S2, 6 and the elastic member 5 are continuous in the longitudinal direction.
[0020]
The first and second continuous sheets S1, S2 and the top sheet 6 have side edges a1, a2, a3 extending in the longitudinal direction in parallel with each other. The first continuous sheet S1 and the second continuous sheet S2 have the same width dimension, and the top sheet 6 has a width dimension shorter than that of the first and second continuous sheets S1 and S2.
[0021]
The sheets S1, S2, 6 and the elastic member 5 have substantially the same speed to the first step (a) and the eighth step (h) by a nip roll rotated by a driving mechanism, a suction roll having a suction means, or the like. And is moved sequentially from the first step (a) to the tenth step (j) by a mechanism provided for each step.
[0022]
"First step (a)"
The first step (a) is a step of continuously supplying the first and second continuous sheets S1, S2 and the elastic stretchable member 5 forward in the longitudinal direction. In the first step (a), the first and second continuous sheets S1, S2 and the elastic member 5 wound around the winding rolls 100, 101 are drawn out by the nip roll 102 and the suction roll 103, respectively. Continuously fed forward in the longitudinal direction. The continuous sheets S1 and S2 are formed on one side edge a1 of the sheet surfaces of the first and second continuous sheets S1 and S2 by an adhesive application mechanism 104 provided between the winding roll 101 and the suction roll 103. An adhesive (not shown) is intermittently applied along. Each elastic member 5 is stretched at a required magnification between the nip roll 102 and the suction roll 103, and the sheet surface on which the adhesive of the first and second continuous sheets S1 and S2 is applied while maintaining the stretched state. Overlapping in the vicinity of one side edge a1.
[0023]
In the first step (a), in addition to applying the adhesive to the continuous sheets S1, S2, the adhesive may be applied to the elastic member 5, or the adhesive is applied to the continuous sheets S1, S2 and the elastic member 5. You may apply to both. The adhesive may be applied continuously as well as intermittently.
[0024]
"Second step (b)"
A 2nd process (b) is a process of attaching each elastic member 5 to 1st, 2nd continuous sheet S1, S2. In the second step (b), the continuous sheets S <b> 1, S <b> 2 and the elastic member 5 enter between suction rolls 103 that rotate opposite to each other, and the elastic member 5 is in an extended state on the peripheral surface of the rolls 103. It is attached to the vicinity of one side edge a1 of the continuous sheets S1, S2 via an adhesive. Then, 1st, 2nd continuous sheet S1, S2 approachs into each bending mechanism 105 provided in the 2nd process (b). In the continuous sheets S1 and S2, the vicinity of the one side edge a1 is bent inward in the width direction by the bending mechanism 105, and the elastic members 5 are respectively covered with the first and second continuous sheets S1 and S2. In the second step (b), the elastic member 5 can be attached in the vicinity of one side edge a1 of each of the continuous sheets S1 and S2 by using a heat sealing technique without using an adhesive. In the case of using the heat fusion technique, the adhesive application mechanism 104 in the first step (a) can be omitted.
[0025]
"Third step (c)"
The third step (c) is a step of overlapping the sheet surfaces of the first and second continuous sheets S1 and S2. In the third step (c), the first and second continuous sheets S1 and S2 enter between the suction rolls 106 that rotate opposite to each other, and the sheet surfaces of the continuous sheets S1 and S2 are the circumference of the suction roll 106. Overlap each other in the plane. At this time, the one side edges a1 of the first and second continuous sheets S1, S2 to which the elastic member 5 is attached are in a state of being coincident with each other.
[0026]
“4th step (d)”
The fourth step (d) is a step of joining the sheet surfaces of the superimposed first and second continuous sheets S1 and S2. The first and second continuous sheets S1 and S2 that overlap each other enter the joining mechanism 107 provided in the fourth step (d), and maintain the stretched state of the elastic member 5, while the sheets of the continuous sheets S1 and S2 are in contact with each other. The surfaces are joined by the joining mechanism 107. The sheet surfaces are joined to each other in a joining region b1 extending in the width direction from one side edge a1 of the continuous sheets S1 and S2 while being spaced apart from each other by a predetermined dimension in the longitudinal direction.
[0027]
In the figure, the joining area b1 is a pair close to each other and extends from one side edge a1 of the first and second continuous sheets S1 and S2 to the center in the width direction. The joining area b1 may extend to the vicinity of the other side edge a2 facing the one side edge a1 of the continuous sheets S1 and S2, or may end in the vicinity of the one side edge a1 of the continuous sheets S1 and S2. Good. The dimension of the peripheral wall part 2 of the opening sheet 1 in FIG. 1 is determined by the dimension extending in the width direction of the joining region b1. The dimension extending in the width direction of the bonding area b1 is preferably in the range of 2 to 5 cm.
[0028]
The joining area b1 may have a required width and extend in a band shape in the width direction of the continuous sheets S1 and S2. It is preferable that the dimension of each joining area | region b1 spaced apart in the longitudinal direction exists in the range of 5-10 cm in consideration of the dimension of the longitudinal direction of the opening sheet 1. Each of the bonding regions b1 is preferably spaced apart and arranged in parallel in the longitudinal direction at equal intervals, but may be separated and arranged in parallel at different intervals. The joining mechanism 107 can join the sheet surfaces of the continuous sheets S1 and S2 by using an adhesive or a heat fusion technique.
[0029]
"5th step (e)"
The fifth step (e) is a step of cutting the first and second continuous sheets S1 and S2. The first and second continuous sheets S1 and S2 enter the cutting mechanism 108 provided in the fifth step (e), and the cutting mechanism 108 extends to the width direction and the longitudinal direction of the continuous sheets S1 and S2. Is put. The incision is formed from a first incision line c1 extending in the width direction substantially at the center of the joining area b1, and a second incision line c2 extending in the longitudinal direction of the continuous sheets S1 and S2 following the first incision line c1. Has been.
[0030]
The first cut line c1 has a dimension slightly longer than the dimension extending in the width direction of the joining area b1, and extends from one side edge a1 of the continuous sheets S1 and S2 to the center in the width direction. The second score line c2 extends from the end of the first score line c1 to the front and rear in the longitudinal direction of the continuous sheets S1 and S2. The extended end of the second score line c2 is located between both side edges a1 and a2 of the continuous sheets S1 and S2 and the joining area b1.
[0031]
The dimension extending in the width direction of the first cut line c1 is preferably in the range of 2 to 5 cm, similarly to the dimension extending in the width direction of the joining area b1. The dimension of the second score line c2 extending forward in the longitudinal direction from the first score line c1 and the dimension of the second score line c2 extending rearward in the longitudinal direction from the first score line c1 It may be shorter than half of the separation dimension, and it is preferably in the range of 2.5 to 5 cm. The second score line c2 preferably extends in the same dimension as the front and rear in the longitudinal direction around the first score line c1, but may have different dimensions. The cut lines c1 and c2 extend in an inverted T shape, but may extend in an inverted Y shape.
[0032]
“Sixth Step (f)”
The sixth step (f) is a step of expanding each of the other side edges a2 of the continuous sheets S1, S2 outward in the width direction. The continuous sheets S1 and S2 that overlap each other enter the expansion mechanism 109 provided in the sixth step (f), and the other side edge a2 of each of the continuous sheets S1 and S2 is indicated by arrows X and X by the expansion mechanism 109. It is expanded outward in the width direction shown. When the other side edge a <b> 2 of each of the continuous sheets S <b> 1 and S <b> 2 is expanded, as shown in FIG. 4, the opening sheet 1 having the peripheral wall portion 2, the base side portion 3, and the opening portion 4 surrounded by the peripheral wall portion 2. Can be obtained. In each of the continuous sheets S1 and S2, a portion extending from the imaginary line K connecting the ends of the second cut line c2 adjacent to the second cut line c2 to one side edge a1 of each of the continuous sheets S1 and S2 is an open sheet. 1 is formed, and the portion extending from the second cut line c2 and the virtual line K to the other side edge a2 of each of the continuous sheets S1 and S2 forms the base side part 3 of the opening sheet 1.
[0033]
"Seventh step (g)"
The seventh step (g) is a step of inverting the peripheral wall portion 2. The continuous body of the opening sheet 1 enters the reversing mechanism 110 provided in the seventh step (g). The reversing mechanism 110 reverses the peripheral wall portion 2 to the sheet surface opposite to the sheet surface from which the peripheral wall portion 2 of the opening sheet 1 extends by the vacuum means. As shown in FIG. 5, the peripheral wall portion 2 of the opening sheet 1 reversed along the imaginary line K is inward in the longitudinal direction so that the extending direction is opposite to that in FIG. 4 and the joining regions b <b> 1 face each other. Extend toward.
[0034]
"Eighth step (h)"
The eighth step (h) is a step of continuously supplying the liquid-permeable continuous surface sheet 6 forward in the longitudinal direction and superimposing the sheet surface of the surface sheet 6 on the sheet surface of the opening sheet 1. In the eighth step, the top sheet 6 wound around the winding roll 111 is drawn out by the suction roll 112 that rotates opposite to each other, and is continuously supplied forward in the longitudinal direction. On the peripheral surface of the suction roll 112, the sheet surface of the top sheet 6 is aligned with the longitudinal center line Y 1 that bisects the opening sheet 1 in the width direction and the longitudinal center line Y 2 that bisects the top sheet 6 in the width direction. The sheet surface of the opening sheet 1 overlaps with each other. The top sheet 6 is disposed on the sheet surface opposite to the sheet surface from which the peripheral wall portion 2 of the opening sheet 1 extends, and closes the bottom 4 a of the opening 4 of the opening sheet 1. The top sheet 6 only needs to have a width dimension capable of closing the opening 4 of the opening sheet 1, and the width dimension of the top sheet 6 may be larger than that of the opening sheet 1.
[0035]
"Ninth step (i)"
The ninth step (i) is a step of joining the sheet surface of the opening sheet 1 and the sheet surface of the top sheet 6 together. The continuous body of the opening sheet 1 and the continuous body of the top sheet 6 enter the joining mechanism 113 provided in the ninth step (i) in a state of being overlapped with each other, and the joining mechanism 113 performs the second cut of the opening sheet 1. The vicinity of the line c <b> 2 and the portion of the base side portion 3 that overlaps the top sheet 6 are joined to the sheet surface of the top sheet 6. At the time of joining the opening sheet 1 and the top sheet 6, the stretched state of the elastic member 5 and the expanded state of the opening sheet 1 are maintained. The joining mechanism 113 can join the opening sheet 1 and the top sheet 6 using an adhesive or a heat fusion technique.
[0036]
"10th step (j)"
The tenth step (j) is a step of cutting the continuous body of the joined opening sheet 1 and top sheet 6. The continuous body of the opening sheet 1 and the top sheet 6 enters the cutting mechanism 114 provided in the tenth step (j), and the continuous body of the opening sheet 1 and the top sheet 6 is formed by the cutting mechanism 114 of the opening sheet 1. It cut | disconnects by the cutting line c3 which crosses between the adjacent surrounding wall parts 2 to the width direction. When the opening sheet 1 and the surface sheet 6 are cut, the individual opening sheets 1 shown in FIG. 1 can be obtained.
[0037]
In this line, the seventh step (g) for inverting the peripheral wall portion 2 of the opening sheet 1 can be omitted. In the case where the seventh step (g) is omitted, the longitudinal center line Y1 that bisects the opening sheet 1 in the width direction and the longitudinal center line Y2 that bisects the top sheet 6 in the width direction coincide with each other. The surface sheet 6 is disposed on the sheet surface opposite to the sheet surface from which the peripheral wall portion 2 extends, and the sheet surface of the surface sheet 6 and the sheet surface of the opening sheet 1 are overlapped. Thereafter, the vicinity of the second cut line c2 of the opening sheet 1 and the portion of the base side portion 3 overlapping the surface sheet 6 are joined to the surface sheet 6, and the continuum of the opening sheet 1 and the surface sheet 6 is joined to the opening sheet 1. It cut | disconnects by the cutting line c3 which crosses between the adjacent surrounding wall parts 2 to the width direction.
[0038]
As an adhesive used for joining the sheets S1, S2, 6 and joining the sheets S1, S2 and the elastic member 5, it is preferable to use a hot melt adhesive. A heat seal, a sonic seal, or the like can be used as a means for heat fusion. The joining of the sheets S1, S2, 6 and the joining of the sheets S1, S2 and the elastic member 5 may be performed continuously or intermittently. For the cutting of the sheets S1, S2 and the cutting of the sheets S1, S2, 6, a laser beam or ultrasonic waves can be used in addition to using a cutting die.
[0039]
In this line, an optical sensor formed by a light projecting unit and a light receiving unit, a rotational speed sensor for measuring the rotational speed of the roll, a control device connected to these sensors, and a drive device connected to the control device, Is used to control the positioning when the sheets S1, S2, 6 are overlapped in the first step (a) to the tenth step (j), and the supply speed of the sheets S1, S2, 6 and the elastic member 5. . The memory of the control device stores a program that realizes the optimum operating environment of the line.
[0040]
6 and 7 are partially broken perspective views of the disposable diaper 20 to which the opening sheet 1 of FIG. 1 is attached, and an end view taken along line AA of FIG. 6, and FIG. 8 is a view taken along line BB of FIG. It is sectional drawing. The opening sheet 1 is cut out so that the center of each of the other side edges a2 is convex inward in the width direction, and has an hourglass shape.
[0041]
The diaper 20 is interposed between the liquid-impervious opening sheet 1, the liquid-permeable top sheet 6, the liquid-impervious back sheet 7 having an hourglass shape, and the top sheet 6 and the back sheet 7. It is composed of a liquid-absorbing core 8. The diaper 20 has a front waistline region 21, a rear waistline region 23, and a crotch region 22 positioned between the front and back waistline regions 21 and 23 in the longitudinal direction, and both side edges 20a extending in the longitudinal direction. And both end edges 20b located in the front and rear waist regions 21, 23 and extending in the width direction.
[0042]
On both side edges 20a of the diaper 20, a pair of leg-around elastic members 9 extending in the longitudinal direction are interposed between the opening sheet 1 and the back sheet 7, and attached to at least one of the sheets 1 and 7 in an expanded state. It has been. A pair of film-like elastic members 10 around the waist that extend in the width direction are interposed between the opening sheet 1, the top sheet 6, and the back sheet 7 at both end edges 20 b of the diaper 20. 6 and the back sheet 7 are attached in an extended state. A base end portion of a pair of tape fasteners 11 extending inward in the width direction is attached to both side edge portions 20 a of the rear waist region 23.
[0043]
In FIG. 6, the elastic members 5, 9, and 10 are released from the extended state, and gathers are formed along the upper portion of the peripheral wall portion 2 of the opening sheet 1 and both the side edge portions 20 a and both end edge portions 20 b of the diaper 20. . The diaper 20 is a target tape (not shown) in which the free end of the tape fastener 11 is attached to the outer surface of the back sheet 7 via an adhesive (not shown) applied to the free end of the tape fastener 11. Fasten to and use.
[0044]
When the diaper 20 is curved in the longitudinal direction with the inner surface thereof inward, the elastic member 5 attached to the opening sheet 1 contracts, and the peripheral wall portion 2 of the opening sheet 1 moves from the diaper 20 as shown in FIGS. Stand up. When the peripheral wall portion 2 of the opening sheet 1 stands, the peripheral wall portion 2 and the surface sheet 6 define a pocket P that opens toward the inner side in the longitudinal direction and the inner side in the width direction of the diaper 20. Since the peripheral wall part 2 of the opening sheet 1 becomes a barrier, the diaper 20 prevents the excretion excreted in the opening part 4 from leaking from the both side edge parts 20a and the both end edge parts 20b of the diaper 20. it can.
[0045]
In the diaper 20, both side edges of the top sheet 6 end near the outside of both side edges of the core 8, and the both side edges of the base side part 3 of the opening sheet 1 and the back sheet 7 further outward in the width direction from the top sheet 6. And is extended. In the both-ends edge part 20b of the diaper 20, the joining area | region b1 of the opening sheet 1 is extended inward in the longitudinal direction, and the 2nd cut line c2 vicinity of the opening sheet 1 is bent in the longitudinal direction inward of the diaper 20. The vicinity of the second score line c2 is joined to the surface sheet 6.
[0046]
For the opening sheet 1, a hydrophobic nonwoven fabric, preferably a breathable liquid-impervious nonwoven fabric can be used. As the top sheet 6, a hydrophilic non-woven fabric or a liquid-permeable sheet such as an apertured plastic film, preferably a liquid-permeable and hydrophilic sheet can be used. As the back sheet 7, a hydrophobic nonwoven fabric, a liquid-impervious plastic film, a laminate sheet of a hydrophobic nonwoven fabric and a plastic film, preferably a gas-permeable and liquid-impervious sheet can be used.
[0047]
As the nonwoven fabric, nonwoven fabrics such as spunlace, needle punch, melt blown, thermal bond, spun pond, and chemical bond can be used. As constituent fibers of the nonwoven fabric, polyolefin fibers, polyester fibers, polyamide fibers, polyethylene / polypropylene or polyester composite fibers, and the like can be used.
[0048]
The core 8 is mainly compressed by a mixture of fluff pulp and superabsorbent hydrogel particles, and is entirely covered with a water-permeable sheet (not shown) such as tissue paper. The elastic members 5, 9, and 10 are band-like or thread-like, and natural rubber or synthetic rubber can be used.
[0049]
【The invention's effect】
According to the manufacturing method of the opening sheet which concerns on this invention, since the means for shifting a traverse means and a sheet | seat is not required, the opening sheet extended cyclically | annularly can be produced efficiently and continuously. In the diaper to which the opening sheet manufactured by the above-described manufacturing method is attached, the opening sheet extends in an annular shape. Therefore, when the opening sheet functions as a barrier, not only both side edges of the diaper but also both end edges of the diaper. Leakage of excrement from can be prevented. Since the elastic member is attached to the upper part of the peripheral wall portion of the opening sheet in a stretched state, when the diaper is bent in the longitudinal direction with the inner surface thereof inward, the peripheral wall portion and the surface sheet of the opening sheet are A pocket opening inward is formed.
[Brief description of the drawings]
FIG. 1 is a view showing an example of an opening sheet.
FIG. 2 is a manufacturing process diagram of an opening sheet showing an example of a manufacturing method.
FIG. 3 is a manufacturing process diagram of an opening sheet continued from FIG. 2;
4 is a perspective view of a sixth step (f) in the plan view of FIG. 3. FIG.
FIG. 5 is a perspective view of a seventh step (g) in the plan view of FIG. 3;
6 is a partially broken perspective view of a disposable diaper to which the opening sheet of FIG. 1 is attached. FIG.
7 is an end view taken along line AA in FIG.
8 is a cross-sectional view taken along line BB in FIG.
[Explanation of symbols]
1 Opening sheet
2 peripheral wall
3 Basic side
4 openings
4a bottom
5 Elastic elastic members
6 Liquid-permeable surface sheet
b1 Joining area
c1 First cut line
c2 Second cut line
c3 cutting line
K virtual line
S1 1st continuous sheet
S2 Second continuous sheet

Claims (4)

In the manufacturing method of the opening sheet positioned on the upper surface of the liquid-permeable surface sheet of the disposable diaper,
(A) A pair of continuous sheets having both side edges extending in parallel with each other in the longitudinal direction are continuously fed forward in the longitudinal direction, and a pair of continuous elastic elastic members are stretched forward in the longitudinal direction. Supplying continuously, and stacking each of the elastic members near one side edge of each of the continuous sheets;
(B) bending the vicinity of one side edge of each of the continuous sheets to cover the elastic member, and attaching each of the elastic members to each of the continuous sheets in an extended state;
(C) a step of superimposing the sheet surfaces of the continuous sheets on each other in a state in which one side edge of each of the continuous sheets to which the elastic member is attached is aligned with each other;
(D) A predetermined dimension apart from the longitudinal direction and parallel to the longitudinal direction, and extending from one side edge of the continuous sheet in the width direction intersecting the longitudinal direction, to one side edge of the continuous sheet A step of joining the sheet surfaces of each of the continuous sheets while maintaining the stretched state of the elastic member in a joining region that does not reach the opposing other side edge;
(E) a first cut line that extends in the width direction from one side edge of the continuous sheet in the width direction and does not divide the continuous sheet; and the both sides following the first cut line The length extending forward and rearward in the longitudinal direction so as to be parallel to the edge, and the dimension extending from the first cut line to either the front or rear in the longitudinal direction is more than half of the separation dimension of the joining area. A step of making a cut in each of the continuous sheets with a second cut line that is short and has an extended end located between both side edges of the continuous sheet;
(F) The other side edges of the continuous sheet are expanded outward in the width direction, and each of the continuous sheets is separated from a virtual line connecting ends of the second cut lines adjacent to the second cut lines. The opening having a peripheral wall part that reaches one side edge, a base side part that reaches the other side edge of each of the continuous sheets from the second cut line and the virtual line, and an opening part surrounded by the peripheral wall part Obtaining a continuous sheet,
The method comprising the steps of: The method according to claim 1, wherein the step (f) includes a step of cutting the continuous body of the opening sheets along a cutting line that crosses between the peripheral wall portions in the width direction. After the step (f), the step of continuously supplying the liquid-permeable continuous surface sheet having a width dimension capable of closing the opening of the opening sheet to the front in the longitudinal direction; and the surface sheet Overlapping the sheet surface of the top sheet on the sheet surface opposite to the sheet surface from which the peripheral wall of the opening sheet extends, so that the bottom of the opening of the opening sheet can be closed, and the stretched state of the elastic member The sheet surface of the opening sheet and the sheet surface of the top sheet that overlap each other are joined in the vicinity of the second cut line and the base side portion of the opening sheet while maintaining the expanded state of the opening sheet. The method of Claim 1 including the process and the process of cut | disconnecting the continuous body of the said opening sheet and the said surface sheet with the cutting line which crosses between the said surrounding wall parts to the said width direction. After the step (f), the step of inverting the peripheral wall portion to the sheet surface opposite to the sheet surface from which the peripheral wall portion of the opening sheet extends, and reversing the extending direction of the peripheral wall portion; A step of continuously supplying the liquid-permeable continuous surface sheet having a width dimension capable of closing the opening to the front in the longitudinal direction; and the surface sheet can block the bottom of the opening of the opening sheet. And maintaining the sheet surface of the top sheet on the sheet surface opposite to the sheet surface from which the peripheral wall portion of the opening sheet extends, while maintaining the extended state of the elastic member and the expanded state of the opening sheet The step of joining the sheet surface of the opening sheet and the sheet surface of the top sheet that overlap each other in the vicinity of the second cut line of the opening sheet and the base side portion, and the width between the peripheral wall portions adjacent to each other direction The method of claim 1, wherein is included the step of cutting the continuous body of the topsheet and the opening sheet cutting line crossing.

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