JPH0122362B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a disposable diaper in which the absorbent material in the crotch area is formed into a thick layer so that at least both sides of the crotch area are effectively brought into close contact with the leg circumference of the expropriator. The present invention relates to a method of manufacturing a so-called pants-type disposable diaper including an elastic member.

In the past, several methods for manufacturing disposable diapers have been proposed and implemented. One method is to form a thick absorbent layer in the crotch area of a disposable diaper, and to attach both sides of the absorbent layer to the sides of the user's legs. Disposable diapers equipped with a stretchable member for effectively adhering the diaper
No method has been proposed that enables high-speed mass production of disposable diapers having a structure such as that disclosed in No. 71402.

The purpose of the present invention is to propose the above-mentioned method, and to achieve the purpose, the embodiments of the method of the present invention are described in the order of steps of the method of the present invention shown in FIG. The explanation will be as follows with reference to the figures below.

In FIG. 1, a continuous carrier sheet 11, such as a hydrophobic web-like sheet, is placed on its unwinding roll 11.
It is continuously unwound from a and guided onto the conveyor belt 13 inside the housing 12, and the housing 12
A pulp sheet (not shown) is guided into the continuous carrier sheet 11, and the pulp sheet is defibrated into a cotton-like form by a defibrating roll 14, and the defibrated pulp is left on the upper surface of the continuous carrier sheet 11 with a slight widthwise end portion remaining. The suction 1 is spread and laminated and placed at the bottom of the conveyor belt 13.
5, the defibrated pulp is suctioned to stabilize the stacked state on the continuous carrier sheet 11.
After the defibrated pulp on the continuous carrier sheet 11 is lightly pressed by a pair of press rolls 16, it is processed by the first rotating drum 17 and its attached members. That is, as shown in FIG.
Press it against the 8 side. Continuous carrier sheet 11
is maintained at the required tension,
Therefore, when the first drum 17 is pressed against the defibrated pulp layer 18, the pressed part curves downward, and both ends 11b in the width direction of the continuous carrier sheet 11 near the pressed part are in contact with the defibrated pulp layer. 1
The continuous carrier sheet 11 and the defibrated pulp layer are pressed by pressing rods 20 protruding from both sides of the drum 17 to bend the continuous carrier sheet 11 and the defibrated pulp layer. A pair of first embossing rolls 21
lead to. On the other hand, a continuous absorbent sheet 22 such as tissue paper having the same width as this continuous absorbent material is continuously unwound from the unwinding roll 22a and is guided to the first embossing roll 21 while polymerizing on the upper surface of the continuous absorbent material. As a result, the first continuous absorbent material 23 is formed, and the first continuous absorbent material 23 is embossed by the first embossing roll 21. The first continuous absorbent material 23 in which each layer is thus unified is processed using a first cutter 29 or the like. That is, as shown in FIGS. 3 and 11, the center portion of the first continuous absorbent material 23 in the width direction is pressed by a pair of press wheels 25 supported at a required interval by a rotating shaft 24, and its length is Two parallel fold lines 26 continuous in the direction are provided, and slits 27 are provided on both sides in the width direction at regular intervals in the length direction by a first cutter 29 having a blade 28 on the circumferential surface. Folded portions 30 and non-folded portions 31 are formed alternately in the length direction and are guided to a first folded guide 32. Furthermore, the first
When forming the continuous absorbent material 23, as shown in FIG. It is preferable to bend the continuous carrier sheet 22 so that it does not bend, as shown in FIG.
Just guide it from the right side of 6 so that it narrows to this.

As shown in FIG. 3, the first folding guide 32 includes L-shaped frame members 33a and 33b with cross-sectional surfaces facing each other.
and a band-shaped support member 34. The frame members 33a, 33b are arranged so that a gap that gradually narrows toward the front is created between the inner ends of the upper walls 35a, 35b, and the upper walls 35a, 35b forming the gap are As shown in FIG. 5, the width of the first section 36 near the base end is the narrowest, and the width of the second section 37 continuing in front thereof gradually increases toward the front.
Further, the width of the third section 38 continuing in front of the third section 38 is the widest and parallel, and the base points 39a and 39b at which the width of the second section 37 starts to gradually increase toward the front are shifted in the front-rear direction. The support member 34 is a first
and upper wall portions 35a, 35b of second areas 36, 37
It has a width narrower than the gap between the inner ends of the gap, and is located at the center of the gap and slightly higher than the upper walls 35a and 35b of the first and second sections 36 and 37, and the third section The upper wall portions 35a and 35b of the area 38 are located on the lower side, slightly lower than these. Further, as shown in FIG. 4, a support frame 40 is provided inside the first folding guide 32, and a conveyor belt 4 is provided between the upper surface of the support frame 40 and the upper walls 35a and 35b.
1 is positioned. Further, above the gap between the inner ends of the upper wall portions 35a and 35b of the first section 36, a pair of pressers 42 whose base end portions are attached at a required distance in the lateral direction are supported by a rotation shaft 43. It has been done. 1st
First continuous absorbent material 23 guided to folding guide 32
straddles the gap between the upper wall parts 35a and 35b and is positioned between them and the support member 34 and moves forward, and while the non-folded part 31 comes to the lower side of the pusher 42, the pusher 42 is moved forward. By pressing the non-folding part 31 with its tip while making one rotation, the non-folding part 31 is forcibly pushed into the lower surface of the upper wall parts 35a, 35b, and the folding part 30 is pushed into the lower surface of the upper wall part 35a, 35b.
While advancing the first continuous absorbent material 23 while supported on the upper surface of the support member 35b, one side of the folded portion 30 is gradually raised by the inner end of the upper wall portion 35a and folded onto the upper surface of the support member 34. Then, similarly, the other side portion is gradually raised up from the inner end of the upper wall portion 35b and bent onto the upper surface of the bent side portion (first
(see Figure 1), as shown in Figure 1, the intermediate roll 44
The first continuous absorbent material 23 is transferred to the conveyor belt 4 via
1 to a conveyor belt 45.

On the other hand, as shown in FIG.
At the same time, a pulp sheet (not shown) is introduced into the housing 47 and defibrated into fluff by a defibrating roll 49, and the defibrated pulp is placed on the upper surface of the continuous carrier sheet 46. The defibrated pulp is spread and laminated with both ends left intact in the width direction, and the defibrated pulp is sucked by a suction 50 disposed below the conveyor belt 48 to form a continuous carrier sheet 46.
Stabilize the stacked state on top. The defibrated pulp on the continuous carrier sheet 46 is lightly pressed with a press roll 51 to form the first continuous absorbent material 23.
A second continuous absorbent material 52 (FIGS. 10, 12, 1
5) is formed, and then processed by the second rotating drum 53 and its layered member. That is, this second
The rotary drum 53 and attachments are the same as the first rotary drum 17 and pusher rod 20 described in connection with FIG. The second continuous absorbent material 52 is bent onto the upper surface of the first continuous absorbent material 23 via the intermediate roll 44 as shown in FIG. After polymerization, these are advanced by a conveyor belt 45.

As shown in FIG. 1, the second continuous absorbent material 52 superposed on the first continuous absorbent material 23 is attached to a pair of second embossing rolls 5 having an uneven pattern only on the circumferential surface of the upper roll.
5, the first and second continuous absorbent materials 23 and 52 are sequentially cut into the length of one diaper by a second cutter 56,
6 and 12 by making the speed of the conveyor belt 57 faster than the speed of the conveyor belt 45.
As shown in the figure, each cut absorbent body 58 is advanced at a constant interval in the front-rear direction.

The chain line 56a shown in FIG. 12 indicates the second cutter 56.
Indicates the cutting position.

On the other hand, as shown in FIG.
A continuous back sheet 59, which is made of plastic film or the like which is wider than the diaper, is continuously unwound from the unwinding roll 59a onto the third rotary drum 60, and in the process, the continuous back sheet 59, which is to be used as the back surface of the diaper, is made of plastic film or the like, and is paralleled at regular intervals in the lateral direction. Each adhesive line is applied to the inner surface of the back sheet 59 by the arranged first and second spray groups 61 and 62. That is, as shown in FIG. 13, adhesive lines 63 are applied at regular intervals in the longitudinal direction on both sides of the inner surface of the continuous back sheet 59, and
Adhesive line 64 is continuously applied in the length direction between both adhesive lines 63 on the inner surface of.

On the other hand, as shown in FIG. 1, a tape-shaped continuous elastic member 65 made of polyurethane foam or the like is continuously unwound onto a continuous back sheet 59 from an unwinding roll 65a.

On the other hand, as shown in FIG.
A continuous surface sheet 66 of non-woven fabric or the like, which has the same width as 9 and is to be used as the surface of the diaper, is rolled out from its unwinding roll 66a.
From there, the continuous back sheet 59 is passed through the intermediate roll 67.
The third and fourth spray groups 6 are continuously unwound on the top and are arranged in parallel at regular intervals in the lateral direction in the process.
8 and 69, each adhesive line 70, 71, and 72 is applied to the inner surface of the continuous top sheet 66 as shown in FIG. That is, the adhesive lines 70 and 72 are applied continuously in the length direction, and the adhesive line 71 is applied at regular intervals in the length direction, similar to the adhesive line 63 shown in FIG.

As shown in FIG. 6, the continuous elastic member 65 is expanded and contracted in its length direction, and its lower surface is covered with the continuous back sheet 5.
9 with an adhesive line 63 shown in FIG. 13, and as shown in FIG. After adhering the continuous back sheet 59 to the upper surface of the first continuous absorbent material 65 with an adhesive line 72, and adhering the continuous back sheet 59 to the lower surface of the first continuous absorbent material 23 with an adhesive line 64, as shown in FIG. As shown in FIG. A laminated molded body 75 is formed, and this is advanced through an intermediate roll 76, and as shown in FIG. 1, it is further crimped and fixed by a second crimping roll 77. The continuous elastic member 65 in this continuous laminated molded body 75 has the adhesive lines 63, 71 (the first
3 and 15), the continuous back sheet 59 and the continuous top sheet 60 are not bonded to each other, that is, the longitudinal direction of the adhesive lines 63 and 71 shown in FIGS. 13 and 15. The continuous stretchable member 65 at the interval _L1 in is in a state where it is not adhesively restrained by the adhesive at all. Moreover, each absorber 58 is
As shown in FIG. ₁₄ , in order to position each absorbent body 58 between the continuous back sheet 59 and the continuous top sheet 66, the continuous back sheet 59 and continuous surface sheet 6
6 and the moving speed of each absorbent body 58 by the conveyor belt 57 shown in FIG. 6 are appropriately adjusted and synchronized.
It goes without saying that the lengths of the absorbers 3 and 71, the widthwise spacing, and the longitudinal spacing of each absorbent body 58 are set appropriately.

Both sides of the continuous laminated body 75 thus formed in the width direction are pressed into a band shape with a constant width, that is, the width W shown in FIG. 15 in the length direction by a pair of press rolls 78 shown in FIG. Furthermore, each absorber 5
The continuous back sheet 59 and the continuous top sheet 66 of 8 spaces (see L ₂ shown in FIG. 14) are bonded by a pressure roll 79.
After crimping, the continuous laminated molded body 75 is advanced through the conveyor belt 80, and a binding tape (for use when wearing the diaper) is applied to both ends thereof, that is, to areas corresponding to the front and rear ears of each diaper (described later). (not shown) is attached by a group of rolls 81, and is further advanced via a conveyor belt 82, and a third cutter 83 cuts both ends of the continuous laminated body 75 in the width direction at regular intervals in the length direction, as shown in FIG. By cutting it out, a recessed notch 84 is provided and guided to the folding device.

This folding device is shown in FIGS. 7 and 8. As shown in the figure, a fourth rotating drum 85 whose length is shorter than its width (its length is shorter than the width of the second continuous absorbent material 52) is pressed onto the upper surface of the continuous laminated molded body 75. Then, bend the width direction both sides 85a slightly inward, and in that state, insert the second folding guide 86.
lead to. The second folding guide 86 has frame members 86a and 86b having a U-shaped cross section facing each other, and a conveyor belt 87 is positioned inside the frame members 86a and 86b. Both sides 75a of the continuous laminated molded product 75 that have passed through the second folding guide 86 are sufficiently bent inwardly, and the conveyor belts 88, which face each other, The continuous laminated molded body 7 is held between each absorbent body 58 (see FIG. 14 _L2 ), which is interposed at a constant interval in the front-rear direction while maintaining its bent state by being compressed by the compressor 89.
5 in the width direction using a pair of fourth cutters 90 to form one diaper 91 as shown in FIGS. 14 and 17. When cut in this way, diaper 9
The elastic member 65 at the cut end of the continuous laminated molded body 75 contracts and is drawn into the interior from the cut end as shown in FIG. This is because, as already explained, the continuous stretchable member 65 is not adhesively restrained at all by the adhesive at the portion of the distance _L1 shown in FIG. 13.

As shown in FIG. 8, the diaper 91 is compressed and advanced by conveyor belts 92 and 93 facing each other, and one end of approximately one-third of the length of the diaper 91 is the delivery end of the conveyor belts 92 and 93. The first part is designed to move vertically when protruding from the part.
After the one end is pushed and bent by the pushing member 94 between the vertical portion 93a of the conveyor belt 93 and the vertical portion 95a of the conveyor belt 95 opposing this, the diaper 91 is folded into both the vertical portions 93a and 95a.
Approximately one-third of the other end of the diaper 91 is moved by the second pushing member 97, which moves in a horizontal direction when the one end enters the evacuation guide part 96 while being held therebetween. is pushed between the nipping transfer roll group 98 and bent. The thus folded diaper 91 has the folded state shown in FIG. 16, and is sequentially pushed to the parallel holding frame 102 on the conveyor belt 101 by the pushing member 100 which is configured to move vertically in the guide frame 99. do.
The first and second pushing members 94 and 96 are adapted to return after pushing one end and the other end of the diaper 91, respectively, as described above.

In addition, in the method of the present invention, the first continuous absorbent material 2
In some cases, the second continuous absorbent material 52 is not polymerized on top of the second continuous absorbent material 52.
In addition, in the case of polymerization, instead of embossing or side pressing the second continuous absorbent material 52 in a state where the first continuous absorbent material 23 is polymerized as described above, the polymerization step is omitted. In other words, at the same time or immediately after forming the second continuous absorbent material 52, embossing or band-shaped pressing may be applied to both sides in the width direction.

As described above, according to the method of the present invention, so-called pants-type disposable diapers can be manufactured in a series of steps using equipment with a relatively simple structure, and therefore the intended purpose can be achieved. , is extremely useful as a method for manufacturing this type of diaper.

[Brief explanation of drawings]

The drawing is a schematic diagram of an apparatus for carrying out the method of the invention. FIG. 1 is a schematic side view of the arrangement of the above device. FIG. 2 is a perspective view showing a state in which both ends of the continuous absorbent material are bent by a rotating drum. Figure 3 shows
FIG. 3 is a perspective view of a folding mechanism section of the first continuous absorbent material. FIG. 4 is a sectional view taken along line 4-4 in FIG. FIG. 5 is a plan view of the first folding guide. FIG. 6 is a perspective view of a portion forming a continuous laminated molded body. FIG. 7 is a perspective view showing a state in which both sides of the continuous laminate molded product in the width direction are folded by a rotating drum and a folding guide. FIG. 8 is a side view of the portion where both longitudinal sides of each diaper are folded. FIG. 9 is a cross-sectional view of the first continuous absorbent material. 1st
Figure 0 is a cross-sectional view of the second continuous absorbent material. FIG. 11 is a plan view showing the folded state of the first continuous absorbent material.
FIG. 12 is a plan view showing a state in which the second absorbent material is superposed on the folded first continuous absorbent material. The thirteenth is a plan view showing adhesive lines on the continuous back sheet. FIG. 14 is a plan view showing how the continuous laminated molded product is cut to form individual diapers. FIG. 15 is an enlarged sectional view taken along the line 15-15 in FIG. 14. FIG. 16 is a perspective view showing the diaper folded. Figure 17 shows
FIG. 17 is a perspective view showing a partially opened state of the diaper shown in FIG. 16; DESCRIPTION OF SYMBOLS 11... Continuous carrier sheet, 18... Defibrated pulp layer, 21... First embossing roll, 22...
...Continuous absorbent sheet, 23...First continuous absorbent material,
25...Press wheel, 26...Folding line, 2
7...slit, 29...first cutter, 30...
...folding part, 31...non-folding part, 32...first
Folding guide, 46...Continuous carrier sheet.

Claims (1)

[Scope of Claims] 1. A method for manufacturing a disposable diaper, comprising the following steps. (1) At least, a defibrated pulp layer is laminated on the upper surface of a continuous hydrophobic net-like sheet, leaving both widthwise ends thereof, and both widthwise ends of the web-like sheet are folded back onto the upper surface of the defibrated pulp layer. The process of forming a continuous absorbent material. (2) After applying an emboss to the continuous absorbent material and applying at least two parallel fold lines in the length direction of the central part in the width direction by pressing, the continuous absorbent material is given a constant interval in the length direction of both sides in the width direction. A process of forming folded portions and non-folded portions alternately by providing slits at intervals, and then folding the folded portions inward. (3) A step of cutting the continuous absorbent material into the length of one diaper to form each absorbent body. (4) The absorbent body is adhered between a continuous top sheet and a continuous back sheet at regular intervals in the length direction, and the continuous top sheet and the continuous back sheet located on both sides of each absorbent body in the width direction A step of bonding a continuous stretchable member between backsheets while being stretched in the length direction to form a continuous laminated molded product. (5) A step of cutting the continuous laminated molded body between the absorbent bodies in the width direction to form individual diapers. 2. A method for manufacturing a disposable diaper, characterized by including the following steps. (1) At least, a defibrated pulp layer is laminated on the upper surface of a continuous hydrophobic net-like sheet, leaving both widthwise ends thereof, and both widthwise ends of the web-like sheet are folded back onto the upper surface of the defibrated pulp layer. forming a first continuous absorbent material; (2) After applying an embossing to the first continuous absorbent material and applying at least two parallel fold lines in the length direction of the central part in the width direction by pressing,
A process of forming folded portions and non-folded portions alternately by providing slits at regular intervals in the length direction of both sides in the width direction, and then folding the folded portions inward. (3) A step of forming a second continuous absorbent material using a defibrated pulp layer, which is narrower in width than the first continuous absorbent material and wider than the width of the central portion of the folded portion of the absorbent material after folding. (4) A step of forming each absorbent body by polymerizing the second continuous absorbent material on the upper surface of the first continuous absorbent material and cutting them into a length corresponding to one diaper. (5) The absorbent body is adhered between a continuous top sheet and a continuous back sheet at regular intervals in the length direction, and the continuous top sheet and the continuous back sheet located on both sides of each absorbent body in the width direction A step of bonding a continuous stretchable member between backsheets while being stretched in the length direction to form a continuous laminated molded product. (6) A step of cutting the continuous laminated molded body between the absorbent bodies in the width direction to form individual diapers. 3 Layer the defibrated pulp on the upper surface of the continuous hydrophobic web-like sheet, leaving both ends in the width direction, and fold both ends in the width direction of the web-like sheet onto the upper surface of the defibrated pulp layer to form a second continuous absorbent material. 3. The method for manufacturing a disposable diaper according to claim 2, wherein the absorbent material is polymerized on the upper surface of the first continuous absorbent material so that the net-like sheet is on the upper surface. 4. The method for manufacturing a disposable diaper according to claim 2, wherein both sides of the second continuous absorbent material in the width direction are pressed into a band shape.