JPH0428364A - Pants type paper diaper - Google Patents

Abstract

PURPOSE:To permit the continuous mass production and improve the preventing effect for the leak around a leg by fixing an absorbing body in a nonextension state in the degree free from deformation on a back sheet or top sheet in the part where the absorbing body is positioned and allowing a flap part to be contracted only by the contraction force due to the elastic expandable member. CONSTITUTION:Between a liquid-permeable top sheet 1 which is made of nonwoven fabric and faced the skin of a user, first back sheet 2 which is not liquid-permeable and made of polyethylene, etc., and the second back sheet 6 made of nonwoven fabric, etc., a semirigid absorbing body 3 which has a main body of cotton type pulp and has an absorbing paper in case of necessity is enclosed, leaving a flap part FL which is constituted of the sheets 1 and 2, in the part around a leg. An article which is previously formed into sand glass form is folded in the longitudinal direction, and the folded both sides are fixed, and a pants type paper diaper having no fifting tape is obtained. Further, the elastic expandable members 1 and 2 do not cross in the lower part, and in the flap part FL around a leg, a loop which is made continuous by the elastic expandable members 1 and 2 is constituted. Since the elastic expandable members do not cross, the manufacturing equipment can be made simple, and the manufacturing method is made easy, and material can be economized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of industrial application] The present invention provides a pants-type disposable diaper, specifically, a pants-type disposable diaper, in which a flap portion constituted by each of the above-mentioned sheets is provided at least in the leg area between the liquid-permeable top sheets. The present invention relates to a pants-type disposable diaper in which an absorbent body is enclosed in the diaper, which is formed in an hourglass shape in advance, is folded in the front-rear direction, and both folded sides are fixed, and which has no fastening tape.

[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 main object of the present invention is to provide a vehicle that is suitable for continuous mass production, has a high effect of preventing leakage from the undercarriage, and has particularly excellent shape retention.

[Means to solve the problem]

The problem described above is that the 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 in the product state, the semi-rigid absorbent body is In pants-type disposable diapers that have an hourglass shape when unfolded, are folded in the front-rear direction, are fixed on both folded sides, and have no fastening tape, from the front edge of one leg to the inseam of the manufactured disposable diaper. It has an elastic elastic member continuous to the front body end around the other leg, and the leg portion of the elastic elastic member extends from the center in the longitudinal direction toward the rear body, and substantially extends from the center of the leg. The entirety of the elastic elastic member located in the surrounding part is fixed in the flap part so that it can be expanded and contracted, and in the part where the absorbent body is substantially located, the backsheet or top sheet is kept in a substantially non-stretched state to the extent that the absorbent body is not deformed. fixed to
Moreover, this problem can be solved because the flap portion is contracted substantially only by the stretching force of the elastic stretchable member.

More preferably, the semi-rigid absorbent body is enclosed between the liquid-permeable top sheet and the liquid-impermeable back sheet, leaving flap portions formed by the sheets at least around the legs, and in the product state, the semi-rigid absorbent body is In a pants-type disposable diaper that has an hourglass shape when unfolded from the center of the direction, is folded in the front-rear direction, and is fixed on both folded sides and has no fastening tape, the product disposable diaper starts from the front edge of one leg. A first elastic stretchable member extends around the inseam of the diaper and continues to the front end of the other leg, and continues from the rear end of one leg around the lower part of the product disposable diaper to the rear end of the other leg. a second elastic stretchable member, the leg portion of the first elastic stretchable member extends in the direction of the rear body from the longitudinal center, and further, the leg portion of each elastic stretchable member substantially The whole is fixed at the flap part so that it can be expanded and contracted, and the part where the absorbent body is located is fixed to the back sheet or top sheet in a substantially non-stretched state to the extent that the absorbent body is not deformed, and each elastic This problem can be solved by ensuring that the telescopic members do not intersect.

[Effect]

In this type of paper diaper, side leakage from around the legs is always a problem.

On the other hand, the disposable diaper according to the present invention has an elastic stretchable member that extends from the front end of one leg around the crotch of the product disposable diaper to the front end of the other leg,
The leg portion of this elastic stretchable member extends from the longitudinal center toward the rear body, and substantially the entire elastic stretchable member located in the leg portion is fixed to the flap portion so as to be expandable and contractible, and substantially In the portion where the absorbent body is located, the absorbent body is fixed to the backsea 1 or top seam I in a substantially non-stretched state to the extent that the absorbent body is not deformed,
Furthermore, the flap portion is substantially contracted only by the stretching force of the elastic stretchable member.

Generally, the urinary opening is located approximately 1/3 from the longitudinal center of the front body for boys, and at the center of the waist for women, but the present inventor found that It has been found that the presence of elastic stretchable members can prevent lateral leakage from around the legs. On the contrary, it has been found that the elastic stretchable member on the back body side is not essential, and that the material used can be reduced by omitting the elastic stretchable member on the back body side.

Further, in the present invention, in the portion where the substantially semi-rigid absorbent body is located, each elastic elastic member is fixed to the back sheet or top sheet in a substantially non-stretched state to the extent that the absorbent body is not deformed. As a result, the semi-rigid absorbent body does not deform, resulting in the paper diaper having excellent shape retention as a whole, increasing the product value in terms of appearance and improving packaging workability.

On the other hand, if necessary, an elastic elastic member can also be arranged on the back body side. In this case, if the first and second elastic elastic members were to intersect, the length of each elastic elastic member would be long, which would not only be uneconomical, but also, when fixing them to the back sheet or top sheet, There is a drawback that the manufacturing method and equipment are complicated, such as the fixing process being two stages.

On the other hand, in the present invention, since the elastic extensible members do not intersect, the manufacturing equipment is not only simplified and the method is easy, but also the amount of materials can be reduced.

〔Example〕

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

1 to 3 clearly show examples of the structure of a disposable diaper according to the present invention.

That is, at least the leg portion is located between the liquid-permeable top sheet 1 made of non-woven fabric or the like and facing the wearer's skin, the liquid-impermeable first back sheet 2 made of polyethylene or the like, and the second back sheet 6 made of non-woven fabric or the like. A semi-rigid absorbent body 3 mainly made of cotton-like pulp and provided with absorbent paper etc. as required is enclosed in the flap part FL formed by each of the sheets 1.2, and as shown in FIG. It is a pants-type paper diaper that is formed into a shape and is folded in the front-rear direction and fixed on both sides of the folded form and does not have a 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 the lower part of the product disposable diaper (inseam part) from the B end of the back body around one leg where necessary.
One or more second elastic elastic members 5 made of a continuous rubber thread or the like are provided at the rear body B end of the other leg around the body, and the substantial part of the leg area of each elastic elastic member 1.2 The whole is fixed at the flap part F L so that it can expand and contract,
In the portion where the absorbent body 3 is substantially located, the backsheet 2 is in a substantially non-stretched state to the extent that the absorbent body 3 is not deformed.
, and each elastic elastic member 1.2 does not intersect at the lower part, and the leg flap portion F L
In this case, each elastic member 1.2 forms a continuous loop, that is, a continuous loop.

Furthermore, in the present invention, the leg portion of the first elastic stretchable member 4 extends toward the rear body from the center in the longitudinal direction, and conversely, the second elastic stretchable member 5 is shortened. The length l of the leg portion of the first elastic elastic member 4 extending from the center in the longitudinal direction toward the rear body is more preferably 2 cm or more. Further, as described above, the second elastic stretchable members 5 are not essential (1), but when they are arranged, they must not intersect, and even if they are further separated, the separation distance g is preferably 3cIT1 or less. If it exceeds 3, the first elastic stretchable member 4 and the second elastic stretchable member 5 become discontinuous in the leg area, causing side leakage.

Since FIG. 4 and subsequent figures show a manufacturing facility for paper diapers, this will be explained together with a more detailed example of the structure of the paper diaper.

That is, the continuous liquid-permeable top sheet that has been wound up in advance and the continuous liquid-impermeable first backsheet 1-2 made of polyethylene or the like are unwound and supplied to the assembly line, and during the feeding process, the The absorbent bodies 3, which are elongated in the width direction of the line, are intermittently fed on the conveyor 10. Further, elastic elastic members 11.11 for waist gatherers are supplied to both inner surfaces of the top sheet 1 while being coated with hot melt adhesive by a nozzle 12, and are supplied between the first back sheet 2 by nip rolls 13.14. Fixed by polymerization. Further, the inner surface of the first backsheet 2 (relative to the absorbent body) is coated with hot melt adhesive by an applicator 15 before being supplied between the nip rolls 13.14, and the top sheet is coated between the nip rolls 13.14. 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 middle 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
Since the hot melt adhesive has been intermittently applied in advance to the portion substantially located on the absorbent body 3, the first
An elastic elastic member 4 and a second elastic elastic member 5 are fixed to the back surface of the first backsheet 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 I8, and the first and second elastic stretchable members 4.
At least substantially the portion of the absorbent body 5 that is not located on the absorbent body 3 and the second backsheet 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. 6 to 9, 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 stretchable members 4.5 are superimposed on the back surface of the first backsheet 2, and are preferably pressed by the disposed pressure roll 22 to form the first backsheet. It is fixed at the part on the back surface of 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 extends to chuck the first and second elastic telescoping members 4.5, respectively, and then releases the chucking at the amount of extension. At this time, the first and second elastic elastic members 4.5
The pot melt members 4 and 5 applied by the applicator 24 to almost the front surface of the second back sheet 6 are fixed to the first back sheet 2 and the second back sheet 6 by a polymerization roll 18 having a length slightly shorter than the separation width of the second back sheet 6. Ru.

After such fixing, the other portions of the second backsheet 6 are fixed by a full-width fixing roll 25 for final overlapping fixation of the second backsheet 6.

On the other hand, in the above example, the reason why both the first and second backsheets 2 and 6 are used is
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 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. 10, the temporarily fixed roll 23 that has been retracted is replaced with the top sheet elastic stretchable members 4 and 5 at a position slightly to the right of the right end of the absorbent body 3 in FIG. In order to fix it to the sheet 1 and further prevent it from shifting in the lateral direction, it is held down by a temporary fixing roll 23, and in this state, it is pulled outward from the center of the line by gripping means 50, 50. One backsheet 2A is stacked on top of the other, and the first and second elastic elastic members 4 and 5 are fixed using a hot melt adhesive applied to the inner surface of the topsheet 2A in advance. It can be covered with

” 2.Each equipment may be upside down. Further, an elastic elastic member may be fixed to the top sheet 1 side. When the amount of expansion of the elastic stretchable member is small, it is
It is also possible to resist tension by fixing it to

〔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.

[Brief explanation of drawings]

Fig. 1 is a developed view of the main parts of the disposable diaper of the present invention, Fig. 2 is a perspective view of the main parts, Fig. 3 is a perspective view, Fig. 4 is a front view of an example of manufacturing equipment, and Fig. 5 is a plan view. Figures 6 to 8 are plan views of main parts;
FIG. 9 is a side view of the gripping means, and FIG. 10 is a front view of another example of the manufacturing apparatus. 1...Top sheet, 2...1st back sheet, 2
A... Single back sheet, 3... Absorber, 4...
First elastic elastic member, 5...Second elastic elastic member, 6...
・Second back sheet.

Claims (2)

[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 inseam of the manufactured disposable diaper from the edge of the front body around one leg. It has an elastic stretchable member continuous to the front end of the other leg, and the leg portion of the elastic stretchable member extends from the center in the longitudinal direction toward the rear body, and substantially extends around the leg. The entirety of the elastic elastic member located in the section is elastically fixed in the flap section, and in the section where the absorbent body is substantially located, the elastic member is attached to the back sheet or top sheet in a substantially unstretched state to the extent that the absorbent body is not deformed. fixed against
Moreover, the pants-type disposable diaper is characterized in that the flap portion is contracted substantially only by the stretching force of the elastic stretchable member. (2) 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 inseam 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. a stretchable member, the leg portion of the first elastic stretchable member extends from the longitudinal center toward the rear body, and substantially the entire leg portion of each elastic stretchable member is stretchable. The elastic member is fixed to the back sheet or the top sheet in a substantially non-stretched state to the extent that the absorbent member is not deformed in the portion where the absorbent member is located, and each elastic elastic member is A pants-type disposable diaper that is characterized by not crossing over.