CZ383597A3 - Sanitary towel - Google Patents

Abstract

This invention is a sanitary napkin (2) comprising a fluid permeable top sheet (4), a fluid impermeable back sheet (6), and an absorbent core (8) disposed between said both sheets, the back sheet (6) having a shape complementary to a contour of the sanitary napkin (2), being substantially elongate, and being wider (16) at a rearward portion thereof than at a forward portion (20) thereof, the absorbent core (8) being narrower than the forward portion of the back sheet (6), a first adhesive layer (14) being disposed on a side of the back sheet (6) in a region where the absorbent core (8) is present, second adhesive layers (28) being disposed on the same side of the back sheet (6) in a rearward portion of the back sheet (6), which is on both sides of the absorbent core (8) and in which the absorbent core (8) is absent, and the first adhesive layer (14) securing the sanitary napkin to the inside of underwear, and the second adhesive layers (28) securing the rearward portion of the back sheet spread inside the underwear.

Description

(57)

The sanitary napkin (2) comprises a fluid permeable topsheet (4), a fluid impermeable backsheet (6), and an absorbent core (8) disposed between the two layers. The backsheet (6) has a complementary shape to the contour of the sanitary napkin (2), which is substantially elongated and wider (16) in its rear panel than its front panel (2). The absorbent core (8) is narrower than the front portion of the backsheet (6) on the side of the backsheet (6) in the region where the absorbent core is present. A first adhesive layer (14), a second adhesive layer (28) is provided. are disposed on the same side of the backsheet (6) in the backsheet of the backsheet (6) on both sides of the absorbent core (8), and in which the absorbent core (8) is absent, and the first adhesive layer (14) . and a second layer of adhesive (28) provides a backsheet for the backsheet stretched on the inner side of the undergarment.

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Sanitary pad

Technical field

The present invention relates to sanitary napkins worn on a female body for absorbing body fluids, and more particularly to sanitary napkins having a forward portion made wider than the back portion.

BACKGROUND OF THE INVENTION

Sanitary napkins are used as traditional means worn on the female body to absorb body fluids. Typically, traditional sanitary napkins have constant widths from the front of the wearer to the back of the wearer. Such inserts, due to their shape and their constant widths, have high production efficiency and have the advantage of saving material. However, it cannot be said that these inserts are sufficiently protective in terms of fluid leakage at the rear. That is, after a long period of use of these sanitary napkins while sleeping at night, the prevention of fluid leakage in the back

Parts of the lying body become a significant problem. Make yourself this? To solve the problem, sanitary napkins having their parts corresponding to the back of the body of a wearer, sanitary napkins made wider than their front parts, are used.

The problem with such sanitary napkins is that these sanitary napkins cannot be stably fastened to the undergarment * ♦ ·· because of their wider back panels, the side portions of these back panels are facing upward in use and compromise long-term leakage prevention. When wrapping individual sanitary napkins, the wider parts of the wrapping of the individual napkins make them wide, and when wrapping the wrapping of the individual napkins with the folded (folded) wider parts, it is necessary that the wider parts are kept folded until the packages are complete.

It is an object of the present invention to provide a sanitary napkin having a wider back panel to prevent fluid leakage.

Yet another object of the present invention is to provide a sanitary napkin with a wider back panel that is stable in realizing fluid leakage prevention.

Yet another object of the present invention is to provide a sanitary napkin with a wider back panel that can be stably folded.

SUMMARY OF THE INVENTION

The sanitary napkin of the present invention comprises a fluid pervious topsheet disposed on the sanitary napkin side to be facing the body of the wearer, a fluid impervious backsheet disposed on the sanitary napkin side to be against the wearer's undergarment, and an absorbent core positioned between the two layers. the backsheet has a shape corresponding to the contour of the sanitary napkin and is substantially extended from the front to the back of the wearer ' s body, and is wider in its back portion corresponding to the back of the wearer than the forward portion thereof Also, the front portion of the backsheet is on the side of the backsheet to be pivoted against the undergarment in the region where the absorbent core is present, a first layer of adhesive is provided, the second layers of adhesive are disposed on the side of the backsheet,

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- 3 to be pivoted against the undergarments in portions of the backsheet of the backsheet, which is on both sides of the absorbent core and in which the absorbent core is absent, and the first adhesive layer secures the sanitary napkin to the inner side of the undergarment; lower layers widely stretched inside (on the inside) of the undergarment.

BRIEF DESCRIPTION OF THE DRAWINGS

A preferred embodiment of the invention will be explained in more detail with reference to the accompanying drawings, in which:

Giant. 1 is a plan view of a sanitary napkin according to one embodiment of the present invention.

Giant. 2 is a cross-sectional view of the sanitary napkin of FIG. 1, along line II-II.

Giant. 3 is a plan view of the sanitary napkin of FIG. 1, in its collapsed state.

DETAILED DESCRIPTION OF THE INVENTION

Giant. 1 illustrates a sanitary napkin according to a first embodiment of the present invention. The sanitary napkin, generally designated by reference numeral 1, comprises a fluid-permeable topsheet 4, a fluid-impermeable backsheet 6, and an absorbent core 8. It is important that when the topsheet 4 directly contacts the wearer's skin, fluid exuded by the body does not unnecessarily touch the wearer. The topsheet 4 is suitably made of a woven or nonwoven fabric of natural fibers or synthetic fibers, a thermoplastic synthetic resin film having a plurality of pores formed therein, a porous synthetic resin foam, pure synthetic foam, pure

AND

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Thermoplastic films of synthetic resin, thermoplastic scrims of synthetic resin, or the like. It is important that the backsheet 6 functions to prevent the fluid absorbed by the absorbent core 8 from flowing out of the pad and soiling the wearer itself or her dress, and is suitably formed from a flexible, fluid impermeable thermoplastic film of synthetic resin such as polyolefin film. A particularly suitable film comprising the backsheet 6 is a low density polyethylene film with a thickness of 0.01-0.05 mm, especially about 0.025 mm thick (sold as MODEL XP 39385 by Ethyl Corp., Visqiieen Division, and as SOFLEXX 1401 by Clopay Corp., Cincinnati, Ohio, USA.) It is important that the absorbent core 8, disposed immediately between the topsheet 4 and the backsheet 6, absorbs and retains fluid that is secreted by the wearer and passes through the topsheet 4. Absorbent Core 8 is suitably formed from, for example, finely divided pulp, i. air felts, creped cellulosic cotton, fused meltblown polymer, chemically stiffened, modified or crosslinked cellulose fibers, synthetic resin absorbent foam, tissue paper, absorbent gelling material (which absorbs fluids and gels), or suitable combinations of these materials.

. In the illustrated embodiment, the topsheet 4 is substantially the same as the backsheet 6 in shape and dimensions. The topsheet 4 and the backsheet 6 are hot-fused to each other, continuously along the entire boundary edges. The hot melt region 10 of the topsheet 4 and the backsheet 6 is indicated by the crossed lines in FIG. 1 and the oblique lines in FIG.

2. If necessary, the topsheet 4 and the backsheet 6 may be attached to each other, for example, by means of an adhesive. As described above, the topsheet 4 and the backsheet 6 have the same shape, and this shape is the shape of the insert 2. The absorbent core 8 is disposed downwardly in the length direction of the insert (Fig. 1) and has substantially the same width ( lateral • 9 * 9

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5 the length in FIG. 1) along the entire length. An adhesive layer 3 for attaching the liner to the wearer's undergarment is disposed at an outer surface of the backsheet 6 substantially corresponding to the absorbent core 8. The adhesive is suitably Century Century Adhesive A-3O5-IV from Century Adhesive Corp., olumbus, Ohio, USA. In the case where the adhesive layer 3 is secured to the outer surface of the backsheet 6, the adhesive is preferably covered with a layer of silicone coated paper to prevent contamination of the adhesive prior to use.

The topsheet 4 and the backsheet 6 protrude slightly forward (upwardly as seen in Fig. 1), beyond the lateral edges 8a of the absorbent core 8, laterally outwardly at longitudinally offset positions slightly upward (upwardly in the view) in Fig. 1). These protruding parts secure the wings of the liner 2. These wings 12 are pivoted into (on) the lower region of the undergarment when the liner 2 is used. If necessary, adhesive layers 14 for attaching the wings to the undergarment may be arranged on the side of the backsheet 6 to be placed against the undergarment.

The topsheet 4 and the backsheet 6 extend further on the backsheet of the insert 2, laterally outwardly beyond the side edge 8a of the absorbent core 8. This protrusion provides a wider (expanded) section 18 that prevents leakage in the longitudinal backsheet (downwardly in FIG. 1). The regions of the insert 2 corresponding to the sides of a wearer are a wider piece 16 by which the leakage effect of these regions can be enhanced.

The wings 12 and the wider portions 16 thus formed beyond the side edge 8a of the absorbent core 8 define a tapered portion 18 therebetween. However, when this pad 2 is in use, the pads 12 of the pad 2 are turned back onto the wearer's undergarments and of this, the insert, in use, has substantially the same width longitudinally from its front end 20 to the base 22 of the tapered portion 18 and successively

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6 increases its width longitudinally rearwardly from the base 22 of the tapered part 18.

As described above, the topsheet 4 and the backsheet 2 are hot-fused to each other in the region 10. This melting provides the topsheet 4 and the backsheet 6 fused together in portions outside the front end edge, rear end edge, and side edge. The topsheet 4 and the backsheet 6 are hot-fused to each other further in the fins 24 of the wings 12 and the bases 26 of the wider panel 16 (the hot-melt regions as indicated by the oblique lines in Figures 1 and 2). The hot melt in the respective regions substantially provides the portions of the topsheet 4 and the backsheet 6 that lie outside along the boundary edge of the absorbent core 8. Thus, the absorbent core 8 is set in position within the liner 2.

As described above, the absorbent core 8 has substantially the same width in the longitudinal direction of the liner 2. This shape of the absorbent core 8 reduces its portions to be cut off in the manufacture of the liner 2, contributing to lower manufacturing costs. Absorbent core 8. it is not present in the wings 12 and portions of the widened portion 16 projecting beyond the two lateral edges of the absorbent cores 8. The absence of the absorbent core 8 in the wings 12 preferably makes these wings sufficiently flexible to be folded. However, in the protruding portions of the extended portion 16, the absence of the absorbent core 8 reduces the stiffness of these protruding portions of the extended portion 16.

16. In order to compensate for the disadvantage of insufficient stiffness, the adhesive layers 28 are provided on portions of that side of the backsheet 6i to be facing the wearer's undergarments, which portions are in the wide panel 16. When the liner 2 is used, projecting portions of the expanded panel 16 are stretched within the wearer's undergarment and adhered to the inner surface of the undergarment by means of adhesive layer 28. Adhesive layers of the expanded portion 16 to prevent protruding portions from peeling in contact with the body

- 7 bearers.

Giant. 3 shows a sanitary napkin according to an embodiment h and FIG. 1, with folded wings 12 and protruding portions of the expanded portion 16. As shown in FIG. 3, the wings 12 and protruding portions of the expanded portion 16 are folded on the topsheet 14. The layers of adhesive 14 on the wings 12 are covered with a release layer 30 with some release agent such as silicone or others applied to their surface, and the left and right wings are mutually The layers of adhesive 28 on the protruding portions of the expanded portion 16 are also covered by a release layer 32 with some release agent, such as silicone or other, applied to the surface thereof, and the left and right protruding portions of the expanded portion 16 are interconnected by this. release layers.

Thus, portions that protrude laterally outwardly beyond the absorbent core 8, i.e., the wings 12 and protruding portions of the expanded portion 16, are folded (folded) onto the topsheet 14 toward the transverse center of the absorbent core 8 along the side edges 8a, by which 2 have a small width. Accordingly, the individual package of the sanitary napkin 2 may be small. The wings 12 and the protruding portions of the expanded portion 16 may be interconnected by means of their respective release layers, thereby avoiding the need to press the wings 12 and the protruding portions of the extended portion 16 and the manufacturing line may be simple.

In the above-described embodiment, the adhesive layers 3 for attaching the liner body 2 to the wearer's undergarment and the adhesive layer 16 to prevent the protruding portions of the enlarged portion 16 from peeling away from the wearer's undergarments are secured separately, but adhesive layers 3 and layers may be in place. adhesives 28 bonded. In any case, it is essential that the adhesive layers are secured to the ····

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the back side of the backsheet in the protruding portions of the expanded portion 16 where the absorbent core 8 is absent. Various design changes are possible within the scope of the invention.

In the sanitary napkin of the present invention, the protruding portions of the extended sanitary napkin portion, also located at the rear of the napkin, are to be secured to the inner side of the bottom binder by means of the extended garment through the layers thereby preventing protruding portions from peeling away wearers and have steadily contributed to preventing leakage. Even if, due to the absence of the absorbent core in the protruding portions of the extended portion located in the rear portion of the sanitary napkin, the protruding portions of the extended portion do not have sufficient rigidity, there is no risk that these protruding portions of the extended portion may peel off.

Claims (6)

PATENTOVĚ Claims A sanitary napkin comprising a fluid-permeable topsheet disposed on the sanitary napkin side to be facing the body of the wearer, a fluid impervious backsheet disposed on the sanitary napkin side to be facing the wearer's undergarment, and an absorbent core positioned between the two layers, the bottom the layer has a shape corresponding to the contour of the sanitary napkin and is substantially extended from the front to the back of the wearer ' s body, and is wider in its back portion corresponding to the back of the wearer than its front portion corresponding to the front of the wearer, is the front of the backsheet. a first layer of adhesive is provided on the side of the backsheet to be turned toward the undergarment in the region where the absorbent core is present, the second adhesive layers are arranged on the side of the backsheet to be turned against the undergarment in portions of the backsheet of the backsheet; it is on both sides of the absorbent core and in which the absorbent core is absent, and a first adhesive layer attaches the sanitary napkin to the inner side of the undergarment, and the second adhesive layer provides protruding portions of the backsheet backing widely spaced on the inner side of the undergarment. The sanitary napkin of claim 1, wherein the absorbent core has substantially the same width from the front to the back of the wearer's body. The sanitary napkin of claim 2, wherein portions of the expanded backsheet are folded (folded) toward the longitudinal centerline of the sanitary napkin, along the side edges of the absorbent core. ♦ ··· · » • · 4 ·  * · • * • • · · * 9 • · Φ Φ • • • Φ · • Μ » • · «· • * · · The sanitary napkin of claim 3, wherein portions of the expanded backsheet backsheet are folded (folded) topsheet and parallel release layers are applied to the adhesive layers. The sanitary napkin of claim 4, wherein the front portions of the backsheet, corresponding to the front of the wearer's body, extend laterally outwardly beyond both sides of the absorbent core in the wings to be folded into the (to) crotch region of the undergarment. The sanitary napkin of claim 5, wherein the wings are provided with adhesive layers and folded to the side of the topsheet toward the longitudinal centerline of the sanitary napkin, along the side edges of the absorbent core, and parallel release layers are applied to the adhesive layers.