JPS635746A - Sanitary napkin and its production - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a sanitary napkin used for treating women's menstrual blood, and a method for manufacturing the same.

[Problems to be solved by conventional technology and invention]

As a sanitary napkin, it has the following characteristics: 1. Adhesion to the contact area of the human body,
In addition to improving the absorption of menstrual blood, it also prevents leakage of menstrual blood.
Various improvements have been devised for the purpose of preventing sanitary napkins from coming into contact with each other.

However, since most conventional sanitary napkins have a rectangular planar shape, they fit particularly in the gluteal cleft of the human body, resulting in a gap being formed between the sanitary napkin and the gluteal cleft. Rear leakage may occur from this gap. Such rear leakage is particularly noticeable when sleeping.

For this reason, in recent years, shorts have been devised to fit the sanitary napkin by pressing it against the human body, but since the sanitary napkin itself is flat, it is necessary to fit it to the intergluteal cleft by wearing shorts. This requires a considerable amount of elasticity, which has the disadvantage of unnecessarily compressing the lower abdomen, causing discomfort.

Therefore, it has been considered that the central part of the sanitary napkin is partially pinched and bent and fastened or crimped to form a raised part that enters the intergluteal cleft. Therefore, when using a sanitary napkin, the width of the rear part becomes narrower, and not only the bent part but the entire rear part enters into the intergluteal cleft, which not only increases discomfort.

It has the disadvantage of causing menstrual blood to leak from both sides of the rear.

The present invention was made in an attempt to provide a sanitary napkin that solves the various conventional problems, and also to provide a method for manufacturing such a sanitary napkin.

[Means for solving problems]

First of all, the sanitary napkin which is the first invention is a sanitary napkin which is formed by interposing a liquid absorbing material between a liquid permeable material sheet and a liquid leakage prevention material sheet, and which are integrally molded. , the width gradually increases toward the rear edge, and this wide rear edge is interposed between the liquid permeable material sheet and the liquid leakage prevention material sheet with a thermally deformed shape retaining material such as a thermoplastic resin film. A sanitary product characterized in that an auxiliary sheet is inserted, and the liquid permeable material sheet side is gradually raised with the center line along the longitudinal direction as a ridgeline, and the other liquid leakage prevention material sheet side is recessed. The napkin is the gist.

Next, the method for manufacturing a sanitary napkin, which is the second invention, includes stacking a liquid-permeable material sheet and a liquid-leak-preventing material sheet with a liquid-absorbing material that is smaller in size similar to both of these sheets sandwiched between them. In a method for manufacturing a sanitary napkin by bonding or welding the peripheral edges of both sheets, prior to the step of bonding or welding the peripheral edges of the liquid permeable material sheet and the liquid leakage prevention material sheet, a thermoplastic resin is Following the step of interposing a thermally deformable shape-retaining auxiliary sheet such as a film between the two sheets, sandwiching a liquid absorbing material between the transparent material sheet and the liquid leakage prevention material sheet and overlapping them, the liquid permeation After adhering or welding the peripheral edges of the material sheet and the liquid leakage prevention material sheet, or when welding the peripheral edges of these two sheets together, the liquid transmission material sheet and the liquid leakage prevention material sheet are placed between a pair of uneven molds. The gist of the present invention is a method for producing a sanitary napkin, which is characterized in that a layered material made of a material sheet or the like is arranged so that the liquid-permeable material sheet side is in contact with a concave shape, and the layered material is heated and pressurized to form the material.

[For production]

The sanitary napkin of the first invention described above has its longitudinal center portion in contact with the groin region, and its rear edge portion whose width gradually increases from the center portion, and its raised portion in contact with the gluteal region. When used along the groin area and in contact with the buttocks, the edge formed by gradually increasing the width will naturally fit along the base of the thigh area in the groin area, and will be flexible due to thermal deformation. The protruding and deformed rear edge naturally fits into the gluteal cleft and the bulges of the buttocks on both sides, allowing the entire sanitary napkin to fit tightly against the groin area of the body, giving it an average and overall appearance without any discomfort. As a result, menstrual blood is absorbed and menstrual blood leakage is eliminated.

The shape-retaining auxiliary sheet inserted between the liquid-permeable material sheet and the liquid-leakproof material sheet acts to maintain the raised shape of the rear edge of the sanitary napkin, and This ensures good adhesion to the parts at all times.

In addition, in the method for manufacturing sanitary napkins described above,
A liquid absorbing material with a predetermined shape and a shape-retaining auxiliary sheet are arranged between the liquid permeable material sheet and the liquid leakage prevention material sheet, and the peripheral edges of the liquid permeation material sheet and the liquid leakage prevention material sheet are bonded together. Alternatively, by welding, the layered body of the sanitary napkin is formed without compressing the liquid-absorbing material part, so three-dimensional sanitary napkins can be manufactured without inhibiting the liquid-absorbing properties of the liquid-absorbing material part. Become so.

In addition, when the inserted shape-retaining auxiliary sheet is interposed between the heated convex mold and the concave mold and is molded, the heat deforms it into the shape of the molded uneven part, so the sanitary napkin layered body can be shaped into a three-dimensional shape. It can be shaped into a shape.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a sanitary napkin according to the present invention and the steps of its manufacturing method will be explained in detail with reference to the drawings.

1 to 3 are views showing one embodiment of the sanitary napkin according to the present invention, FIG. 1 is a perspective view of the sanitary napkin, and FIG. 2 is a view taken from FIG. 1 along the longitudinal direction. It is a cut center sectional view.

As shown in the figure, this sanitary napkin consists of a liquid-permeable material sheet 1 that is the surface that comes into contact with the human body, and a liquid-leakproof material sheet 2 that is the back surface.
A liquid absorbing material 3 is interposed between the liquid leakage prevention material sheet 2 and a shape-retaining auxiliary sheet 5 made of a thermoplastic resin film, for example, a polyvinyl chloride film, is placed on the rear edge 4 that contacts the buttocks side. It is interposed between the liquid absorbent material 3 and the liquid absorbent material 3, and is formed three-dimensionally by applying pressure and heat. The overall planar shape of this sanitary napkin is constricted, with the width narrowing near the center in the longitudinal direction, and the rear edge 4 with the shape-retaining auxiliary sheet 5 interposed therebetween has a fan-like shape. It has become.

The shape-retaining auxiliary sheet 5 may be interposed over the entire surface of the sanitary napkin, but may be interposed only over the rear edge 4 as shown in FIG. ) may be interposed in the form of a band that crosses the longitudinal centerline.

As shown in FIGS. 1 and 2, a raised portion 6 gradually rises from the vicinity of the longitudinal center toward the rear edge 4 toward the liquid permeable sheet 1 side with the longitudinal center line as a ridgeline.
is formed, and the liquid leakage prevention material sheet 2 side is recessed.

This raised portion 6 is a rear edge portion 4 with a shape-retaining auxiliary sheet 5 interposed therebetween.
It is formed by thermally processing and thermally deforming the shape-retaining auxiliary sheet 5.

In this way, the width of the sanitary napkin is narrow near the center in the longitudinal direction, and the rear edge 4 that comes into contact with the buttocks is made wider in a fan shape, and the shape-retaining auxiliary sheet 5 is interposed in this part. By forming the flexible raised part 6 through thermal deformation, the shape-retaining effect is high, and the raised part 6 naturally fits into the intergluteal cleft without being spread out widely, causing no discomfort or discomfort.
Moreover, the sanitary napkin can be used with confidence without causing menstrual blood leakage from the rear edge.

In the above embodiments, the sanitary napkin was formed with a narrow center part in the longitudinal direction, but it is sufficient that the center part in the longitudinal direction is narrower than the rear edge part. The part extending from the center to the center in the longitudinal direction may be formed so that both side edges are parallel, and the form of this part is not limited. However, other thermoplastic resin films such as polyethylene, polyethylene core polypropylene films, paper laminated with these materials, non-woven fabrics made of these materials, etc. may be used, and any heat-shrinkable material may also be used. Other materials can also be used. Furthermore, when using a net-like material as a shape-retaining auxiliary sheet, it is necessary to use a liquid-permeable material sheet that has appropriate strength, flexibility, and absorbency so that it can be worn without discomfort, and also allows moisture to pass through. and between the liquid leakage prevention material sheet.

The insertion position is not limited. FIGS. 4 and 5 are diagrams for explaining the steps of the sanitary napkin manufacturing method according to the present invention. As shown in Figure 4,
A liquid absorbent material 3 having a contour shape that is narrow at the center in the longitudinal direction and gradually increasing in width toward the rear edge portion 4, and a shape retaining material having the same contour shape as the rear edge portion 4 of this liquid absorbent material 3. The auxiliary sheet 5 is superimposed, and the liquid permeable material sheet 1 and the liquid leakage prevention material sheet 2, which are enlarged to have a similar shape to the shape of the liquid absorbing material 3, are superimposed on both sides of the polymer material and their peripheral edges are bonded. Or weld it to make a sanitary napkin roll. Here, when thermally welding the peripheral edges of the liquid permeable material sheet 1 and the liquid leakage prevention material sheet 2, a temperature of about 100 to 200° C. is applied. Thereafter, as shown in FIG. 5, a sanitary napkin spread body is placed between the convex mold 7 and the concave mold 8 so that the liquid permeable sheet 1 comes into contact with the inner surface of the concave mold 8. The convex mold 7 is formed with a recess 9 having a depth corresponding to the thickness of the sanitary napkin and a protrusion 10 for forming a protrusion. A molding recess 11 into which the molding is inserted is formed. The sanitary napkin spread body placed between the two molds is heated at a temperature appropriately set in the range of 80 to 15 o'c and 5 to 100 kg/ad depending on the material of the shape-retaining auxiliary sheet used. A three-dimensional sanitary napkin is obtained by closing the mold under pressure for 2 to 30 seconds and applying heat deformation to the shape-retaining auxiliary sheet 5.

〔effect〕

According to the sanitary napkin of the present invention described above, the width is gradually increased and widened from near the center in the longitudinal direction toward the rear edge, and a shape-retaining auxiliary sheet is inserted over the entire surface or at this widened rear edge. Since the liquid-permeable sheet side from near the longitudinal center to the rear edge is gradually raised with the longitudinal center as a ridgeline, the three-dimensional shape of the sanitary napkin is shaped by the shape-retaining auxiliary sheet. It is maintained by the shape-retaining effect of insertion. In this way, the changes in the periphery due to the increase in width and the shape of the bulge on the rear edge, especially at the base of the thigh, fit the shape of the body from the root to the buttocks, and it adapts to the unevenness of the buttocks, resulting in good contact. . In addition, since the area of the rear edge is widened, menstrual blood, which tends to be concentrated in the rear part, can be sufficiently absorbed, and it is possible to reliably prevent after-leakage, which often occurs when sleeping.

Further, according to the method for manufacturing a sanitary napkin of the present invention,
The liquid-permeable material sheet, the liquid-leakproof material sheet, and the shape-retaining auxiliary sheet into which the liquid-absorbing material is inserted without being damaged are thermally deformed to form a three-dimensional shape that gradually bulges from the center in the longitudinal direction to the rear edge. In addition, a sanitary napkin that fits naturally to the human body, does not cause discomfort, and does not cause leakage can be efficiently produced.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing one embodiment of the sanitary napkin according to the present invention, Fig. 2 is a longitudinal sectional view thereof, and Figs. 3 (a), (b), and (c) are shape-retaining auxiliary sheets. FIG. 4 is an exploded perspective view of the superposed state at the manufacturing stage of the sanitary napkin according to the present invention, and FIG. 5 is a state in which the sanitary napkin is molded using a concave-convex mold. FIG. 1...Liquid permeable material sheet, 2...Liquid leakage prevention material sheet, 3
...liquid absorbing material, 4...rear edge part. 5... Shape-retaining auxiliary sheet, 6... Raised portion. 7...Convex type, 8...Concave type, 9.9'・
... recess, 10 ... protrusion for protrusion, 11 ... molding recess. Figure 1 Figure 2 Figure 3 Figure 4 Procedural amendment Date of July 1986 2 Name of the invention Sanitary napkin and method for manufacturing the same 3 Relationship with the person making the amendment Patent applicant. Address: 29 Nakajima-cho, Kisshoin, Minami-ku, Kyoto Name: Wacoal Co., Ltd. Representative: Yuki Tsukamoto, Representative Director - 4 Agent: 5 Date of amendment order Voluntary action (1) On page 7, line 11 of the specification, “liquid absorption portion” The phrase "without putting pressure on the liquid absorbing part" should be corrected to "without putting too much pressure on the liquid-absorbing part." (2) In the fourth and third lines from the bottom of page 10 of the specification, the phrase "flexibility and absorbency" is corrected to "flexibility."

Claims (2)

[Claims] 1. A sanitary napkin formed integrally with a liquid-permeable material sheet and a liquid-leakproof material sheet with a liquid-absorbing material interposed between them, the width of which gradually increases from near the center in the longitudinal direction toward the rear edge. At the same time, a thermally deformed shape-retaining auxiliary sheet such as a thermoplastic resin film is inserted between the liquid-permeable material sheet and the liquid-leakproof material sheet, so that the wide trailing edge is shaped along the longitudinal direction. A sanitary napkin characterized in that the liquid-permeable sheet side is gradually raised with the center line as a ridgeline, and the liquid-leakproof material sheet side is recessed. 2. A liquid-permeable material sheet and a liquid-leakproof material sheet are stacked with a liquid-absorbing material smaller in size similar to these two sheets sandwiched between them, and the peripheral edges of both sheets are adhered or welded to form a sanitary napkin. In the manufacturing method, prior to the step of gluing or welding the peripheral edges of the liquid permeable material sheet and the liquid leakage prevention material sheet, a thermally deformable shape-retaining auxiliary sheet such as a thermoplastic resin film is placed between the two sheets. inserted into
Following the step of sandwiching and overlapping the liquid absorbing material between the transparent material sheet and the liquid leakage prevention material sheet, after gluing or welding the peripheral parts of the liquid transmission material sheet and the liquid leakage prevention material sheet, Alternatively, when welding the peripheral edges of both sheets together, a layered material consisting of the liquid permeable sheet, liquid leakage prevention material sheet, etc. is placed between a pair of concave and convex molds so that the liquid permeable sheet side is in contact with the concave mold. A method for producing a sanitary napkin, which comprises molding the layered material by applying pressure while heating it.