JPH034850A - Disposable diaper - Google Patents

Abstract

PURPOSE:To simultaneously resolve the prevention of leak and stuffiness by providing a leak preventing part composed of hydrophobic non-woven fabric to be extended upward with a side flap as a base end over a whole length in a lengthwise direction, making a leaking part fall in the inside direction of a diaper, adhering and fixing the leaking part to the surface sheet mold on an absorbing body. CONSTITUTION:The both end parts of a leak preventing part 2 in the lengthwise direction are folded to the inside of the diaper and adhered with a side flap 1 as the base end. For an upper flap 1, the non-woven fabric is double formed by being folded or singly formed and total stretches are required more than 15g/m<3>. For a stretchable elastic body 3 to be provided in the upper flap, urethane foam ts optimum in a meaning to keep an abutting feeling to the skin soft. As a method to fit the stretchable elastic body to the upper flap, a method by a hot melt adhesive agent is suitable. Thus, the diaper, for which the leak from the inside leg is improved and the stuffiness is simultaneously improved by applying permeability to the inside leg part, can be obtained at comparatively low cost.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to disposable diapers. More specifically, the present invention relates to a disposable diaper that prevents leakage and tangles.

[Prior art] A conventional disposable diaper has an absorbent body sandwiched between a top sheet and a back sheet, side flaps extending outward from both longitudinal edges of the absorbent body, and a stretchable elastic body inside the side flaps. This system is designed to prevent leakage by increasing the tightness of the diaper to the thighs when wearing the diaper.

In addition, as shown in Fig. 2, the diaper has a side flap 1 containing a stretchable elastic material, and an upper flap is installed on the inside of the diaper as a leakage prevention part 2, and is placed between the upper flap and the top sheet on the absorbent body. A diaper (hereinafter referred to as type A) in which a pocket portion 3 is formed to prevent leakage is known.

Furthermore, as shown in Fig. 3, the stretchable elastic body is not installed on the side flaps 1, but the stretchable elastic body is installed on the leak prevention part (upper flap part) 2, and the upper flap is attached to the abdomen area and back area of the diaper. A diaper (hereinafter referred to as type B) that is folded outward and fixed with adhesive to improve swelling is known.

[Problem that the invention seeks to solve]

In general, diapers belonging to any of the above-mentioned known forms have a part of the leg gears in the crotch area that prevent leakage.
There is no one that solves the problem of preventing stuffiness at the same time.

That is, in the case of type A diapers, the upper flap part 2 forms a pocket with the inner surface sheet, which is effective in preventing leakage, but the elastic body of the side flaps 1 seals the crotch area. There is no effect of preventing stuffiness. In addition, in the case of type B diapers, the side flaps do not have stretchable elastic material and the breathable upper flap seals the crotch area, which has the effect of improving stuffiness, but the upper flaps fall outward and the pocket area is closed. Since it is not produced, the effect of improving leakage is small.

[Means to solve the problem]

In order to simultaneously improve leakage from the crotch and to improve swelling at a relatively low cost through a partial configuration of the crotch leg gears, the inventors of the present invention have conducted extensive research, and as a result have arrived at the present invention.

The present invention provides a disposable diaper that has an absorbent body between a liquid-permeable top sheet and a liquid-impermeable back sheet, and a side that extends outward from both lateral edges of the absorbent body and that does not include an elastic body. The diaper has a flap, has a leak-proof part made of a hydrophobic nonwoven fabric extending upwardly from the side flap over the entire length in the longitudinal direction of the diaper, and has a stretchable elastic body in the core leak-proof part, and A disposable item characterized in that the leakage prevention part is folded inward of the diaper at both ends in the longitudinal direction, that is, the back region and the abdominal region, and is adhesively fixed on the side flaps or on the top sheet on the absorbent body. It's a diaper.

In other words, since the leak-proof part (upper flap part) extending upward is made of a hydrophobic non-woven fabric, the leak-proof part has breathability and prevents stuffiness. Since the part is folded inward of the diaper and adhesively fixed on the side flap or the top sheet on the absorbent body, there is a gap between the top sheet on the absorbent body and the leakage prevention part (upper flap part). A pocket is formed and improved leakage prevention is achieved.

The present invention will be explained in detail below.

FIG. 1 shows a front perspective view of the disposable diaper of the present invention,
Reference numeral 1 indicates a side flap, and 2 indicates a leak-proof part. Both longitudinal ends of the leak-proof part 2 are folded and glued to the inside of the diaper.

The top sheet, back sheet, absorbent body, etc. used in this diaper can be those used in ordinary diapers, such as nonwoven fabric, polyethylene sheet, fluff pulp + super absorbent polymer, etc., respectively. Further, although the side flaps are usually made of a top sheet and a back sheet laminated together, it is more preferable to use a hydrophobic nonwoven fabric for the side flaps to prevent leakage.

The leak-proof part, ie, the upper flap, must be made of hydrophobic nonwoven fabric. As a guideline for its hydrophobicity, the leakage prevention effect is greater if it is 5 cm or more according to the flow length measurement method.

The flow length measurement method is carried out at 20° C. in a 65% R11 atmosphere as follows.

The length of the nonwoven fabric to be measured is 3 cm in the machine direction and 1 cm in the width direction.
Cut to size 0cm. A nonwoven fabric is placed on a 45° slope, one drop (0.04 cc) of pure water at 20°C is gently dripped onto the nonwoven fabric, and the length of the flow of the water droplet is measured.

The upper flap may be formed by folding the nonwoven fabric into two layers as shown in FIG. 4, or may be formed into a single layer as shown in FIG. 5, or may have other configurations.

The total basis weight of the upper flap part needs to be 15 g/m2 or more, and if it is less than that, leakage is likely to occur. Similarly, when the total basis weight is 80 g/m'' or more, the air permeability decreases and the stuffiness improvement effect decreases.

The stretchable elastic body provided in the upper flap is not limited by material or form as long as it is stretchable such as natural thread comb, urethane film, urethane foam, etc., but it keeps the material soft against the baby's skin. In this sense, urethane foam is optimal. As a method for attaching the stretchable elastic body to the upper flap, a method using a hot melt adhesive is suitable, and in the case of urethane foam, the elastic body is adhesively fixed in a state where it is stretched within a range of 150% to 250%. If the stretch rate is less than 150%, no pocket will be formed between the top sheet on the absorbent body and the upper flap, and the contact against the baby's thighs will be weak, reducing the leakage prevention effect. On the other hand, if the elasticity is high (250% or more), it will dig into the baby's skin when the diaper is worn, causing problems. The other materials also need to have a stretch rate that is sufficient to form a pocket, and must be adjusted to a range that is not too strong.

In addition, in FIGS. 4 and 5, numeral 3 indicates a stretchable elastic body provided within the upper flap, numeral 4 indicates a hydrophobic nonwoven fabric, and numeral 5 indicates an adhesive.

A suitable width for the upper flap is 10 mm to 50 mm; if it is less than 10 mm, its function as a leak prevention part will be reduced, and if it is longer than 50 mm, the absorbing part will become narrow and leakage may occur easily.

A method of gluing and fixing the base end of the upper flap onto the side flap is to attach an adhesive allowance of 6 to the base end of the upper flap.
and adhere using various adhesives or heat sealing methods. The adhesive and fixation to the ventral and dorsal regions in the longitudinal direction of the diaper is also done using various adhesives and heat sealing methods.

The length of the fixed part varies depending on the stretching strength of the elastic body, the stiffness of the absorbent body, etc., but is approximately 20 mm to 100 mm.
range is suitable.

Furthermore, when a hydrophobic nonwoven fabric is used for the side flaps, the nonwoven fabrics of the top sheet, upper flap, and side flaps may be laminated together at predetermined positions, or the nonwoven fabric of the side flaps and the upper flap may be made of the same nonwoven fabric. .

〔Effect of the invention〕

According to the present invention, it is possible to provide a diaper which improves leakage from the crotch area and at the same time improves stuffiness by providing breathability to the crotch area at a relatively low cost.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the disposable diaper of the present invention, Figs. 2 and 3 are perspective views of different conventionally known disposable diapers, and Figs. 4 and 5 explain the leakage prevention part. FIG. ■... Side flap, 2... Leakproof part, 3... Stretchable elastic body, 4... Hydrophobic nonwoven fabric, 5... Adhesive, 6
...Gluing allowance Figure 1

Claims (1)

[Claims] 1. A disposable diaper having an absorbent body between a liquid-permeable top sheet and a liquid-impermeable back sheet, the diaper having side flaps that extend outward from both lateral edges of the absorbent body and do not include an elastic body. , has a leak-proof part made of a hydrophobic non-woven fabric extending upwardly from the side flap over the entire length in the longitudinal direction, and has a stretchable elastic body in the leak-proof part, and both ends in the longitudinal direction, i.e. 1. A disposable diaper, characterized in that the leakage prevention parts are folded inward of the diaper in the back region and the abdomen region, and are adhesively fixed on the side flaps or on the top sheet on the absorbent body.