JPH0428363A - Pants type paper diaper, manufacturing method, and device therefor - Google Patents

Abstract

PURPOSE:To improve the preventing effect for the leak around a leg and in particular the shape holding performance by forming the title diaper so that elastic expandable members do not cross in the lower part and the continuous form is formed by the elastic expandable members, in a flap part around a leg. CONSTITUTION:One or plural pieces of the second elastic expandable members 5 consisting of the continuous string rubber are installed at the edge of a rear garment body B around another leg, surrounding the lower part of a paper diaper. The substantially whole parts of the parts around the legs of the elastic expandable members 1 and 2 are fixed in expandable manner at a flap part FL, and at a part where an absorbing body 3 is substantially positioned, the absorbing body 3 is fixed with a back sheet 2 in a substantially nonextened state in the degree free from deformation. Further, the elastic expandable members 1 and 2 do not cross in the lower part, and a loop which is made continuous or like continuous by the elastic expandable members 1 and 2 is constituted, in the flap part FL around the leg.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pants-type disposable diaper. A pants-type disposable diaper in which an absorbent body is enclosed except for a flap part formed by the above, which is formed in an hourglass shape in advance and is folded in the front and back direction, and both folded sides are fixed and does not have a jacket tape, and the production thereof. METHODS AND APPARATUS.

[Conventional technology]

An absorbent body is contained between the liquid-permeable top sheet and the liquid-impermeable back sheet, leaving a flap formed by each sheet at least around the legs, and when in use, is fixed to the back body relative to the front body. Paper diapers that wrap the wearer in place by fixing them with adhesive tape are widely used.

However, in recent years, so-called pants-type disposable diapers have been developed for the purpose of encouraging people to wean themselves from diapers, or to simplify the process of putting on diapers by relieving adults of the task of putting them on using adhesive tape each time. .

In addition, several proposals regarding pants-type disposable diapers or pants have been made for a long time. for example,
U.S. Pat. No. 3,828,367 discloses a non-absorbent pant structure and method of manufacturing the same.

[Problem to be solved by the invention]

However, since the pants disclosed in the publication do not have an absorbent material, they do not function as disposable diapers for infants or adults. Also,
When considering adding an absorbent body to this pant structure, since the elastic stretchable member can be expanded and contracted over the entire length, the absorbent body also deforms and the inseam part contracts when supplied as a product. Since the appearance of the product becomes extremely poor and the shape is not fixed, workability is poor when a plurality of products are housed in a packaging container.

On the other hand, in terms of the manufacturing method, a curved groove is formed on the nip roll so as to follow the circumference of the legs, and the elastic elastic member is guided by this groove while being fed, but when considering the actual manufacturing equipment. In this case, it is extremely difficult to control, and it cannot be applied in an embodiment in which an absorbent body is included.

Therefore, the object of the present invention is to provide a disposable diaper structure that is suitable for continuous mass production, has a high leakage prevention effect around the legs, and has particularly excellent shape retention. Further, a problem regarding the manufacturing apparatus is to make it not only suitable for manufacturing the disposable diaper of the present invention but also excellent in operational controllability.

[Means to solve the problem]

The problem with the above-mentioned disposable diaper structure is that a semi-rigid absorbent body is enclosed between the liquid-permeable top sheet and the liquid-impermeable back sheet, leaving flaps formed by the sheets at least around the legs, and the diaper has an hourglass shape. In pants-type disposable diapers that are folded in the front-rear direction and have no fastening tape, both folded sides are fixed, from the front edge of one leg around the lower part of the product disposable diaper to the other leg. A first elastic stretchable member continuous to the front body end of one leg circumference, and a second elastic stretchable member continuous to the rear body end of the other leg circumference from the rear body end of one leg circumference around the lower part of the product disposable diaper. and substantially the entire leg portion of each elastic elastic member is extendably and contractably fixed at the flap portion;
Substantially in the portion where the absorbent body is located, the absorbent body is fixed to the backsheet in a substantially non-stretched state to the extent that it is not deformed, and each elastic stretchable member does not intersect at the lower part, and the leg flap This can be solved by making the parts continuous with each elastic stretchable member.

In addition, in terms of the manufacturing method, in the process of feeding one of the continuous liquid-permeable top sheet and the continuous liquid-impermeable back sheet in the line direction, an absorbent body having a length in the width direction of the line is placed on one of the sheets. a step of intermittently supplying a first elastic material on the inner surface of the one sheet before supplying the absorbent material, or intermittently overlapping the absorbent material after supplying the absorbent material, in the middle in the line width direction; a step of continuously supplying the stretchable member and the second elastic stretchable member without substantially stretching; a sheet that faces substantially the portions of the supplied first and second elastic stretchable members where the absorbent body is located; and a step of fixing the first and second elastic members to at least one of the absorbers, a step of grasping substantial portions of the first and second elastic elastic members where the absorber is not located and pulling them in a direction away from each other from the middle of the line; fixing at least the portions of the first and second elastic elastic members that are not substantially located on the absorbent body to the opposing sheet; A process of hollowing out both sheet parts that are not located on the absorbent body, a process of folding one side of the continuous element to the other side with the middle line as a border, and a process of cutting out the top sheet and back sheet in the part where the absorbent body is not present on both sides of the waist. This can be solved by having the following steps: a step of fixing the fixing means, and a step of dividing the product at the fixing portion at the same time or after the fixing means.

Furthermore, in terms of manufacturing equipment, in the process of feeding the continuous liquid-permeable top sheet and the continuous liquid-impermeable first back sheet in the line direction, an absorbent body having a length in the width direction of the line is intermittently inserted between them. means for continuously supplying the first elastic elastic member and the second elastic elastic member to the middle of the back side of the first back sheet in the line width direction without substantially stretching the first and second elastic elastic members; 2. means for fixing a portion of the first and second elastic stretchable members located substantially on the absorbent body to at least one of the absorbent body and a first backsheet; means for grasping and pulling the portions of the line in a direction away from each other from the middle of the line; and means for overlapping the second backsheet on the back surface of the first backsheet in a tensioned state and at least substantially absorbing the first and second elastic members. means for fixing a portion that is not located on the body to the second backsheet; hollowing out a portion of each sheet that is between the first elastic elastic member and the second elastic elastic member and that is not substantially located on the absorbent body; means, means for folding one side of the continuous element to the other side with the middle of the line as a border, means for fixing the backsheet to the topsheet 1 at the portions on both sides of the waist where no absorbent material is present, and simultaneously or simultaneously with this fixing means. This can be solved by having a means for dividing the fixed part later into products.

[Effect]

In the disposable diaper according to the present invention, the first elastic elastic member is continuous from the front body end of one leg around the lower part of the product disposable diaper to the front body end of the other leg, and the rear body end of one leg is continuous. and a second elastic elastic member that extends around the lower part of the product disposable diaper and continues to the rear end of the other leg area, and substantially the entire leg area of each elastic elastic member is fixed at the flap part so as to be expandable and contractible. Since the flap part around the legs is made continuous by each elastic elastic member, it has excellent sealing properties against urination around the legs and can reliably prevent leakage.

In addition, in the area where the substantially semi-rigid absorbent body is located, each elastic elastic member is fixed to the backsheet in a substantially non-stretched state to the extent that the absorbent body is not deformed. The absorbent body does not deform, resulting in excellent shape retention of the disposable diaper as a whole, increasing the product value in terms of appearance and improving packaging workability.

Furthermore, since the elastic stretchable members do not intersect in the crotch region, the manufacturing equipment is simple.

On the other hand, the effects regarding the manufacturing method and apparatus will be explained together with the following examples.

〔Example〕

Hereinafter, the present invention will be explained in more detail by way of examples with reference to the drawings.

FIGS. 1 and 3 clearly show an example of the structure of a disposable diaper according to the present invention.

That is, between a liquid-permeable top sheet 1 made of non-woven fabric etc. that is attached to the wearer's skin and a liquid-impermeable back sheet 2 made of polyethylene etc., there is a flap formed of the sheets 1.2 at least in the leg area. A semi-rigid absorbent body 3, which is mainly made of cotton-like pulp and provided with absorbent paper if necessary, is enclosed in the absorbent body 3, leaving the part FL, and as shown in Fig. 1, it is pre-formed into an hourglass shape and is folded back and forth. This is a pants-type disposable diaper that is fixed on both sides when folded and has no fastening tape.

In the present invention, one or more first elastic elastic members made of a rubber thread or the like are continuous from the F end of the front body around one leg around the lower part of the product disposable diaper to the F end of the front body around the other leg. 4, and one or more second strings made of rubber thread, etc., continuous from the I3 end of the back body around one leg to the B end of the back body around the other leg, around the lower part (inseam part) of the product disposable diaper. +, I elastic member 5, and each elastic elastic member 1
．． Substantially the whole of the leg portion of 2 is fixed at the flap part FL so that it can be expanded and contracted, and in the part where the absorbent body 3 is located, the back is held in a substantially non-stretched state to the extent that the absorbent body 3 is not deformed. fixed relative to the seat 2, and each elastic elastic member 1.2 does not intersect in said lower part;
Each elastic elastic member 1 in the leg flap portion FL
．． 2 creates a continuous loop, that is, a loop that appears to be continuous.

FIGS. 2 and 3 show a manufacturing facility for paper diapers, which will be explained together with a more detailed example of the structure of the paper diaper.

That is, the continuous liquid-permeable I-tub sheet 1 is rolled up in advance.
and a continuous liquid-impermeable first backsheet 2 made of polyethylene or the like are unwound and supplied to an assembly line, and during the supply process, an absorbent body 3 having a length in the width direction of the line is intermittently inserted between them. is supplied on the conveyor 10. In addition, elastic stretchable parts 11.11 for waist gears are supplied to both sides of the inner surface of the top sheet 1-1 while being coated with hot melt adhesive by a nozzle 12, and are connected to the first back sheet 2 by nip rolls 13.14. It is polymerized and fixed in between. Further, the inner surface of the first backsheet 2 (relative to the absorbent body) is coated with a hot melt adhesive by an applicator 15 before being supplied between the nip rolls 13 and 14, and the top sheet is coated between the nip rolls 13 and 14. 1 and the absorbent body 3 is fixed.

Thereafter, the first elastic elastic member 4 and the second elastic elastic member 5 are continuously supplied to the supply means 16 at the center of the back surface of the first back sheet 2 in the line width direction without being substantially stretched.
Powered by. Moreover, before this supply, the hot melt adhesive is applied intermittently by the nozzle 17.

Next, the supplied first and second elastic elastic members 4.5
In the portion substantially located on the absorber 3, there is a hole I
Since the melt adhesive has been applied intermittently in advance, the first elastic elastic member 4 and the second elastic elastic member 5 are fixed to the back surfaces of the first hacksies 1 and 2.

Subsequently, the portions of the first and second elastic stretchable members 4.5 that are not substantially located on the absorbent body 3 are gripped by gripping and pulling means to be described later and separated from each other from the middle of the line.

In this tensioned state, the second backsheet 6 made of nonwoven fabric or the like is superimposed on the first backsheet 2 by the polymerization roll 18, and the first and second elastic stretchable members 4.
At least a portion of the absorbent body 5 that is not substantially located on the absorbent body 3 and the second pack sheet are fixed.

Thereafter, a portion between the first elastic elastic member 4 and the second elastic elastic member 5 and not substantially located on the absorbent body 3 is cut out by the roll cutter device 19.

Subsequently, the sailor means 20 folds one side of the continuous element to the other side with the middle of the line as a boundary.

Next, the top sheet 1 and the back sheet 2 are fixed in a portion where the absorbent body 3 is not present by a device 21 that combines heat sealing and cutting, and are simultaneously separated at the fixed portion to form individual products. After heat sealing, it may be cut by a cutting device provided downstream.

In the above example, the elastic extensible member 4.5 can be fixed by the gripping means shown in FIGS. 4 to 7, for example.

That is, the gripping means 50.50 has a hook 52 at each tip of a cylinder 51.51 provided orthogonally on both sides of the line.

With the gripping means 50 disposed, the first and second elastic elastic members 4.5 are superimposed on the back surface of the first backsheet 2, and are preferably pressed by the disposed presser roll 22 to form the first elastic member 4.5. It is fixed at a portion of the back surface of the backsheet 2 where the absorbent body 3 is located. Then, downstream,
Preferably, the previous fixing boundary portion is temporarily fixed by a temporary fixing roll 23. It is desirable that this temporarily fixed roll be able to move forward and backward with respect to the back surface of the first back roll 2.

In such a state, the hook 52 of the gripping means 50.50
．． 52 is extended to chuck the first and second elastic telescoping members 4.5, respectively, and then releases the chuck at the extension limit. At this time, the first and second elastic elastic members 4.5
When the second backsheet 6 is overlapped by the polymerization roll 18 having a length slightly shorter than the separation width of , the second backsheet 6
The hot melt members 4 and 5 applied by the applicator 24 to substantially the front surface of the inner surface are fixed to the first backsheet 2 and the second backsheet 6.

After such fixing, the other parts of the second back seats 1 to 6 are fixed by a full width fixing roll 25 for final superposition fixation of the second back seat.

On the other hand, in the above example, the reason why both the first and second backsheets 2 and 6 are used instead of - backsheets is as follows.
This has the advantage that the elastic stretchable member can be fixed easily and reliably, and the use of the nonwoven fabric as the second backsheet 6 improves the appearance of the finished product. On the other hand, if the backsheet is made of a single plastic sheet such as polyethylene, it will look unsightly and have low commercial value. However, the present invention does not necessarily exclude this aspect. When using a single backsheet, it is desirable to use a so-called polylaminated nonwoven fabric, with the nonwoven fabric surface as the outer surface.

In the case of such an embodiment, during manufacturing, for example, as shown in FIG.
・To fix the first and second elastic elastic members 4.5 to the top sheet 1 at a slightly right portion of the right end of the absorbent body 3 in FIG. 8, and to further prevent lateral displacement. It was held down by the temporary fixing roll 23, and in this state was pulled outward from the center of the line by the gripping means 50.50, and downstream of this, a single back sheet 2A made of polylaminated nonwoven fabric was overlaid, and its inner surface was coated in advance. The first and second elastic elastic members 4 are attached using hot melt adhesive.
．． 5 can be fixed, and the absorbent body 3 can be covered with a top sheet.

In each of the above-mentioned facilities, the top and bottom may be reversed. Also, an elastic elastic member may be fixed to the tubsies 1 to 1 side. When the amount of expansion of the elastic stretchable member is small, it is also possible to make it resist tension by fixing it to the absorber 3.

〔Effect of the invention〕

As described above, the disposable diaper structure of the present invention is suitable for continuous mass production, highly effective in preventing leakage from around the legs, and particularly excellent in shape retention. Further, the manufacturing apparatus of the present invention is not only suitable for manufacturing the disposable diaper of the present invention, but also has excellent operational controllability.

[Brief explanation of drawings]

FIG. 1(a) is a developed view of the main parts of the disposable diaper of the present invention, (bl
Figure 2 is a front view of an example of the manufacturing equipment, Figure 3 is a perspective view of its main parts,
4 to 6 are plan views of essential parts, FIG. 7 is a side view of the gripping means, and FIG. 8 is a front view of another example of the manufacturing apparatus. 1... Top sheet, 2... First back sheet, 2
A... Single back sheet, 3... Absorber, 4... 1st
Elastic stretchable member, 5... Second elastic stretchable member, 6... Second back sheet.

Claims (3)

[Claims] (1) A semi-rigid absorbent body is enclosed between the liquid-permeable top sheet and the liquid-impermeable back sheet, leaving flaps formed by the sheets at least around the legs, and the center of the longitudinal direction in the product state is For pants-type disposable diapers that have an hourglass shape when unfolded and are folded in the front-rear direction and are fixed on both folded sides and have no fastening tape, insert the lower part of the manufactured disposable diaper from the edge of the front body around one leg. A first elastic stretchable member continuous to the front body end of the other leg circumference, and a second elastic member continuous from the rear body end of one leg circumference to the rear body end of the other leg circumference around the lower part of the product disposable diaper. and an elastic member, substantially the entire leg portion of each elastic elastic member is fixed in the flap portion so as to be expandable and contractible, and the portion where the absorbent body is substantially located is substantially fixed to the extent that the absorbent body is not deformed. It is fixed to the back seat in a non-stretched state, and each elastic stretchable member does not intersect at the lower part, and the elastic stretchable members are continuous as if in the leg flap portion. Pants type disposable diaper. (2) In the process of supplying one of the continuous liquid-permeable top sheet and the continuous liquid-impermeable backsheet in the line direction, an absorbent body having a length in the width direction of the line is intermittently supplied onto one of the sheets. step, a first elastic elastic member and a second elastic member are placed in the middle in the line width direction on the inner surface of the one sheet before supplying the absorbent body, or so as to intermittently overlap the absorbent body after supplying the absorbent body. a step of continuously supplying the elastic stretchable members without substantially stretching them; a step of fixing the first and second elastic members to one side; a step of grasping substantial portions of the first and second elastic elastic members where the absorbent body is not substantially located and pulling the first and second elastic members in a direction away from each other from the middle of the line; fixing at least a portion of the elastic member that is not substantially located on the absorbent body to the opposing sheet, the portion being located between the first elastic elastic member and the second elastic elastic member and substantially on the absorbent body; The process of hollowing out the parts of both sheets that are not located above, the process of folding one side of the continuous element to the other side with the line midway as a border, the process of fixing the top sheet and back sheet in the part where there is no absorbent material on both sides of the waist. A method for manufacturing a pants-type disposable diaper, comprising the steps of: dividing the product at the fixed portion at the same time or after the fixing means. (3) Means for intermittently supplying an absorbent body having a length in the width direction of the line between the continuous liquid-permeable top sheet and the continuous liquid-impermeable first back sheet in the line direction. , means for continuously supplying the first elastic elastic member and the second elastic elastic member to the middle of the back surface of the first back sheet in the line width direction without substantially stretching the first elastic elastic member, and the supplied first and second elastic elastic members. means for fixing portions of the first and second elastic members that are located substantially on the absorbent body to a first backsheet; means for pulling the second backsheet in the direction of separation, overlapping the second backsheet on the back surface of the first backsheet in a tensile state, and pulling at least substantially the portions of the first and second elastic members not located on the absorbent body into the second backsheet; means for fixing to the sheet; means for hollowing out a portion of each sheet that is between the first elastic stretchable member and the second elastic stretchable member and that is not substantially located on the absorbent body; and a continuous element with the middle of the line as the border. A means for folding one side to the other side, a means for fixing the top sheet and the back sheet at the portions where no absorbent material is present on both sides of the waist, and a means for separating the top sheet and the back sheet at the fixed portions at the same time or after this fixing means to produce a product. A manufacturing device for a pants-type disposable diaper, characterized by having the following.