JPH10112U - Liquid permeable surface sheet for body fluid treatment articles - Google Patents

Abstract

(57) [Summary] A body fluid is caused to flow in a predetermined direction on a liquid-permeable surface sheet of a body fluid treatment article. SOLUTION: A liquid permeable surface sheet 1 made of a thermoplastic synthetic resin is constituted by a rib structure composed of a first rib 2 and a second rib 3 intersecting the first rib. Top 7 of second rib 3
Is connected to the side portion 6 of the first rib 2, and the adjacent first rib 2 forms a groove 10 for flowing a body fluid in a predetermined direction.

Description

[Detailed description of the invention]

[0001]

[Industrial applications]

 The present invention relates to a liquid-permeable top sheet made of a thermoplastic synthetic resin used for a body fluid treatment article such as a disposable diaper and a sanitary napkin.

[0002]

[Prior art]

 Conventionally, a non-woven fabric, an apertured sheet made of a thermoplastic synthetic resin, or the like has been used as a liquid-permeable surface sheet for covering an absorber of a body fluid treatment article.

[0003]

[Problems to be solved by the invention]

 It is desirable for body fluid treatment articles to absorb body fluid quickly, and for this purpose, the body sheet should be directed or diffused in the topsheet so that the body fluid can be quickly spread over the entire surface of the absorbent body. It is effective to regulate the diffusion in a predetermined direction. By the way, if the topsheet is a nonwoven fabric, diffusion of bodily fluids can be expected due to the capillary action generated between constituent fibers and bodily fluids.However, nonwoven fabrics used for topsheets generally have a very high density to obtain a soft touch. Therefore, it is difficult to obtain rapid diffusion and to regulate the direction of diffusion. In the case of a perforated sheet, even if the bodily fluid may flow on the sheet surface, the flow direction cannot be regulated.

[0004] The present invention has an object to obtain a surface sheet capable of restricting the flow of a bodily fluid in a predetermined direction by providing a rib structure in a liquid-permeable surface sheet made of a thermoplastic synthetic resin. .

[0005]

[Means for Solving the Problems]

 The present invention is as follows as a means for solving the above-mentioned problem.

This invention is directed to a liquid-permeable surface sheet of a body fluid treatment article made of a thermoplastic synthetic resin sheet.

[0007] The present invention is directed to the topsheet, wherein the top sheet has a top along the longitudinal direction of the article and sides along the longitudinal direction formed by bending both sides of the top downward. And a plurality of second ribs having a top along the lateral direction of the article and intersecting at a right angle to the first rib and spaced apart from and parallel to each other. The two first ribs that intersect with each other and the two second ribs that intersect the two first ribs and are adjacent to each other define an opening, and at the intersection, The second rib is connected to the side of the first rib such that the top of the second rib is lower than the top of the first rib.

[0008]

[Action]

 In the topsheet of this structure, the plurality of first ribs are arranged in parallel along the longitudinal direction of the article, and the rib spacing is maintained by the second ribs. The top of the second rib is connected to the side of the first rib so that the first ribs adjacent to each other extend along the longitudinal direction and form a groove having the second rib and an opening at the bottom. can do. The bodily fluid easily flows in the groove particularly in the vertical direction, and the flow in the direction intersecting the vertical direction is suppressed.

[0009]

【Example】

 The details of the present invention will be described below with reference to the attached drawings.

FIG. 1 is a perspective view showing the surface shape of the topsheet 1 according to the present invention. The surface sheet 1 is composed of a plurality of first ribs 2 which are separated and parallel to each other, and a plurality of second ribs 3 which cross the ribs 2 at a right angle and which are separated and parallel to each other. The two first ribs 2 and the two second ribs 3 intersecting the ribs 2 and adjacent to each other define a liquid-permeable opening 4. The first rib 2 has a top 5 along the longitudinal direction thereof, a side 6 and a lower edge 6A formed by bending both sides of the top 5 downward, and has a substantially U-shaped cross section. . The second rib 3 has a flat sheet shape, and its surface is the top 7. The second rib 3 is connected to the side portion 6 of the first rib 2 at the intersection with the first rib 2 at or near the lower edge 6A. With this connection, the adjacent first ribs 2 maintain a predetermined interval, and form a groove 10 extending along the longitudinal direction of the first ribs 2. The bottom of the groove 10 is constituted by the second rib 3 and the opening 4, and the opening 4 allows body fluid to pass therethrough.

FIG. 2 is a cross-sectional view taken along the line XX in FIG. 1, showing a state in which the lower edge 6 A of the first rib 2 is connected to the top 7 of the second rib 3, and This shows a state where the groove 10 is formed.

FIG. 3 is a perspective view similar to FIG. 1, but in this case, the top 7 of the second rib 3 is connected to one of the adjacent first ribs 2 in the vicinity of the lower edge 6A, and the other. The first rib 2 is connected above the side portion 6. Also in this case, the groove 10 is formed.

In the topsheet 1, the width of the groove 10 is set at 0. 1 between the lower edges 6 A of the adjacent first ribs 2. 1 to 3 mm, the width of the first and second ribs 2 and 3 is 0.3 to 3 mm, and the height of the first rib 2 is 0. It is preferable that the height of the second rib 3 is lower than that of the first rib 2 at 2 to 3 mm, and the opening 4 is in the range of 0.1 to 9 mm ² . The thickness of the first rib 2 is 0.02 to 0.2 mm, and the thickness of the second rib 3 is equal to or smaller than that of the first rib 2. The surface sheet 1 can be obtained by, for example, thermoforming a thermoplastic synthetic resin sheet such as a polyethylene sheet. If the topsheet is hydrophobic, the surface of the sheet 1 can be appropriately subjected to a hydrophilic treatment to adjust the wettability by the bodily fluid. In such a case, the bodily fluid is formed by the capillary action between the side wall of the groove 10 and the bodily fluid. Has the effect of quickly spreading in the longitudinal direction of the first rib 2.

FIG. 4 is a perspective view of a sanitary napkin 20 using the topsheet 1. The sanitary napkin 20 is made vertically long, and the topsheet 1 is used with the top 5 of the first rib 2 on the skin contact side and the grooves 10 aligned in the vertical direction. Thus, the bodily fluid on the surface sheet 1 flows through the groove 10 and reaches both ends of the napkin. Correspondingly, the flow in the width direction of the napkin is reduced, and lateral leakage of body fluid can be prevented.

[0015]

[Effect of the invention]

 The surface sheet according to the present invention can regulate the flow direction of bodily fluid in the direction of the groove by using the groove defined by the first rib in the article in a predetermined direction, and with the use of the groove. Body fluid leakage from a direction intersecting with the groove can be prevented. Further, in the topsheet according to the present invention, when the article is worn, the top of the second rib is lower than that of the first rib and is substantially separated from the skin of the wearer. The contact area of the first rib is so small that even if the first rib is wet with the bodily fluid, it does not give a wet feeling to the wearer, and the air permeability between the skin and the skin is good, so that the first rib does not get stuffy during wearing. Few.

[Brief description of the drawings]

FIG. 1 is a perspective view of a topsheet according to the present invention.

FIG. 2 is a sectional view taken along line XX in FIG.

FIG. 3 is a perspective view similar to FIG. 1 showing one of the embodiments.

FIG. 4 is a perspective view of a sanitary napkin.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Top sheet 2 1st rib 3 2nd rib 4 Opening 5 Top part 6 Side part 7 Top part

Claims (1)

[Utility model registration claims] 1. A liquid permeable surface sheet for a body fluid treatment article comprising a thermoplastic synthetic resin sheet, wherein a top portion along the longitudinal direction of the article and both sides of the top portion along the longitudinal direction are formed by bending downward. A plurality of first ribs having side portions and spaced apart and parallel to each other; and a plurality of second ribs spaced apart and parallel to each other and having a top along a lateral direction of the article substantially perpendicularly intersecting the first ribs. Two first ribs adjacent to each other and two second ribs intersecting with and intersecting the first ribs define an opening; and The liquid-permeable topsheet, wherein the top of the second rib is connected to the side of the first rib such that the top of the second rib is lower than the top of the first rib at the intersection.