JPH0123444B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a skin patch having a base material coated with an ointment on one side, which is used to treat stiff shoulders, lower back pain, bruises, sprains, and the like.

Various materials have been used as base materials for skin patches. For example, woven or knitted fabrics are often used. However, these base materials had the disadvantage that they were thick and did not fit well with the skin, and the edges frayed.

Therefore, in recent years, attempts have been made to use nonwoven fleece, which is made up of constituent fibers randomly accumulated and bonded together with an elastic binding material, as a base material that is thin and does not fray at the edges. Attempts are being made. However, since non-woven fleece has a large number of voids, if a sticky rubber plaster or the like is applied to one side of the non-woven fleece, some of the rubber plaster, etc. will penetrate into the non-woven fleece. The problem is that there is a part where the rubber band is present and a part where the rubber patch is not present, and it is easy to peel off from the boundary between the parts. In other words, since adhesive adhesives have good adhesion to the skin, when the skin patch is removed from the skin, the nonwoven fleece base material, i.e., the part of the nonwoven fabric base where the adhesive agent is present, remains on the skin. However, there was a drawback that only the part where the plaster was not present was often removed from the skin, making it difficult to remove the part remaining on the skin. Another disadvantage is that when using a skin patch, the parts of the nonwoven fabric base material that do not have rubber plasters peel off due to friction with clothing, etc. and are naturally removed, making it difficult to remove the parts that remain on the skin as described above. It was hot. The reason for this is thought to be that due to the cohesive force of the plaster, etc., the area where the plaster or the like is present and the area where the plaster or the like is not present cannot behave in the same manner.

Therefore, the present invention overcomes the above-mentioned drawbacks, and by partially connecting the plaster-present part and the plaster-free part in the non-woven fabric base material with a connecting material, the plaster-present part and the plaster-free part of the non-woven fabric base material are connected. This prevents the non-existing portion from peeling off.

That is, the present invention provides a nonwoven fleece in which constituent fibers having a fiber length of 10 mm to 120 mm are accumulated in a sheet shape, and the constituent fibers are bonded to each other with a binder, in which the maximum degree of orientation of the constituent fibers is 1.5 or more/1
In a skin patch comprising a nonwoven fabric base material using a nonwoven fabric fleece having an adhesive plaster layer provided on one side of the nonwoven fabric base material, the nonwoven fabric base material is formed with a patch layer existing area and a plaster layer absent area. and by printing resin in a pattern on the nonwoven fabric base material, a connecting material made of resin is partially disposed between the area where the plaster layer is present and the area where the plaster layer is not present. This invention relates to a skin patch characterized by the following.

The present invention will be explained in more detail below.

First, the nonwoven fabric base material used in the present invention is a nonwoven fleece in which constituent fibers with a fiber length of 10 mm to 120 mm are accumulated in a sheet shape, and the constituent fibers are bonded to each other with an elastic binding material. A nonwoven fleece whose constituent fibers have a maximum degree of orientation of 1.5 or more/1 is used. The maximum degree of orientation of the constituent fibers here is obtained by the method shown below. First, an arbitrary point is determined on the non-woven fleece, and a square of a certain size is drawn around that point. Although an infinite number of squares can be obtained, there exists one square in which the difference in the number of cross sections of the constituent fibers existing on each orthogonal side is maximum. The ratio of the number of cross sections of the constituent fibers on each orthogonal side of the square is called the maximum degree of orientation of the constituent fibers. Figures 1a and 1b show the state of the cross section of each side when a square with the maximum difference in the number of cross sections of the constituent fibers present on each orthogonal side is cut from the nonwoven fleece. The approximately circular portion in FIG. 1a is the cross section of the constituent fibers, and the amorphous portion in FIG. 1b is the cross section of the constituent fibers. The cross section of the constituent fibers is represented as amorphous by not being cut perpendicular to the longitudinal axis of the fibers (in this case, as shown in Figure 1 a).
The cross-section is represented by a circle, as shown in ), which means that it is often cut approximately parallel to the longitudinal axis. The maximum degree of orientation is given by the number of cross-sections of the constituent fibers in FIG. 1a/the number of cross-sections of the constituent fibers in FIG. 1b.

As is clear from the above, it is understood that when the maximum degree of orientation of the constituent fibers is above a certain value, a nonwoven fleece in which the longitudinal axes of the constituent fibers are aligned in a fixed direction can be obtained. In the direction in which the longitudinal axes of the constituent fibers are lined up, the constituent fibers cannot move even if pulled and have no extensibility, whereas in the direction orthogonal to the above direction, the constituent fibers cannot move. It has extensibility. In non-woven fleece, the constituent fibers are bonded together with a binder, so the above properties are manifested in the form of stretchability.

A nonwoven fleece having a maximum degree of orientation of 1.5 or more/1 and in which the constituent fibers are bonded together with an elastic binder has elasticity, that is, a nonwoven fleece that is suitable for use as a nonwoven fabric base material for the skin patch of the present invention. It is excellent in terms of familiarity. Such a nonwoven fleece can be easily produced by spreading the fibers in a blended state while combing them with a flat card or roller card to form a sheet, and then applying an elastic binder to the sheet. In order to comb the fibers with a flat card or roller card, the fiber length is preferably about 10 mm to 120 mm. Fiber length is 10mm
If it is less than 120 mm or more than 120 mm, it becomes difficult to comb the fibers and arrange them in a certain direction.

In the present invention, a nonwoven fleece having the above structure is used as a nonwoven fabric base material, and a plaster is applied to one side of the nonwoven fleece to form a plaster layer. The ointment used in the present invention includes methyl salicylate, l-menthol,
It is obtained by adding an adhesive such as natural rubber, synthetic rubber, or synthetic resin to an anti-inflammatory analgesic such as camphor or diphenhydramine, and it is sticky and has good adhesion to the skin. be.

The nonwoven base fabric provided with the plaster layer has a cross-sectional structure as shown in FIG. In other words, part of the plaster layer 2 has penetrated into the nonwoven fabric base material 1 (in FIG. 2, the shaded area is the part of the plaster layer that has penetrated into the nonwoven fabric base material).

In the present invention, the connecting material 3 that spans the plaster layer-existing area where the plaster layer 2 has penetrated and the plaster layer-absent area where the plaster layer 2 has not invaded is printed with resin in a pattern on a nonwoven fabric base material. Therefore, it has been partially applied. The connecting material 3 may be made of elastic resin such as natural rubber or synthetic rubber, or may be made of thermoplastic resin or thermosetting resin. The connecting material 3 needs to be applied locally, for example in a dot pattern, so as not to impair the flexibility of the nonwoven fabric base material 1. That is, if the connecting material 3 is applied over the entire surface, the flexibility of the nonwoven fabric base material 1 will be impaired and it will become hard, which is not desirable.

The connecting material 3 can be applied by a known printing technique using, for example, an engraved roll or a perforated hollow roll. The connecting material 3 is preferably applied before the plaster layer 2 is applied. In other words, if the connecting material 3 is applied after providing the plaster layer 2 between the plaster layer existing area and the plaster layer non-existing area, there is a tendency that it is difficult for the connecting material 3 to penetrate into the plaster layer existing area. Because there is.

After the connecting material 3 and the plaster layer 2 are provided on the nonwoven fabric base material 1, a releasable skin sheet such as a release paper or a release film is usually placed on the plaster layer 2. A perspective view of the skin patch of the present invention is shown in FIG.

In the skin patch of the present invention, the connecting material extending between the patch layer-present part and the patch-layer-free part in the non-woven fabric base material is partially arranged by printing resin in a pattern on the non-woven fabric base material. This prevents the two layers of the nonwoven fabric from peeling off without impairing the elasticity and flexibility of the nonwoven fabric. For example, when a skin patch is removed from the skin, the plaster layer remains on the skin. This has the effect of being able to be removed without any damage.

The present invention will be explained below with reference to Examples.

Example After uniformly mixing 50% by weight of polyester fibers of 1.5 denier and 30mm fiber length with 50% by weight of polypropylene fibers of 1.5 denier and 60mm fiber length, the longitudinal axis of the fibers was aligned with the machine flow direction using a flat card. A fiber web of 25 g/m ² was made by arranging the fibers side by side. This fiber web was impregnated with an acrylic resin liquid as a binder, and then dried and crosslinked to obtain a nonwoven fleece weighing 35 g/m ² . The maximum degree of orientation of this nonwoven fleece was 2.2/1.

Acrylic resin liquid is applied as a connecting material to non-woven fleece in a dot pattern using gravure printing, dried,
A nonwoven fleece was obtained by crosslinking and having a connecting material pre-arranged thereon. This non-woven fleece had a weight of 42 g/m ² and an area ratio of 20% to which the connecting material was applied.

Next, a plaster was applied to one side of this nonwoven fleece to obtain a plaster layer. The plaster layer partially penetrated into the nonwoven fleece, and as a result, the connecting material that had been placed in advance came to span the area where the plaster layer was present and the area where the plaster layer was not present.

The nonwoven fabric base material of the skin patch thus obtained has high elasticity, so it easily conforms to the skin, and does not cause layer peeling, so no plaster layer remains on the skin when removed from the skin.

[Brief explanation of drawings]

Figure 1 shows cross sections a and b of each orthogonal side when a square of a certain size is cut out of non-woven fleece.
This is what is shown. FIG. 2 is a cross-sectional view of the skin patch according to the present invention, where 1 is a nonwoven fabric base material, 2 is a plaster layer, and 3 is a connecting material. Furthermore, the shaded area indicates the plaster layer that has penetrated into the nonwoven fabric base material. FIG. 3 is a perspective view of the skin patch according to the present invention.

Claims (1)

[Scope of Claims] 1. A nonwoven fabric fleece in which constituent fibers having a fiber length of 10 mm to 120 mm are accumulated in a sheet shape and the constituent fibers are bonded to each other with a binder, which consists of constituent fibers as defined below. Maximum degree of orientation is 1.5 or more/1
In a skin patch comprising a nonwoven fabric base material using a nonwoven fabric fleece having an adhesive plaster layer provided on one side, the nonwoven fabric base material is formed with a patch layer present area and a plaster layer absent area. and by printing resin in a pattern on the nonwoven fabric base material, a connecting material made of resin is partially disposed between the area where the plaster layer is present and the area where the plaster layer is not present. A skin patch featuring: Note: The maximum degree of orientation of the constituent fibers is the number of cross-sections of the constituent fibers that exist on one side and one side perpendicular to the square, if a square of a certain size is drawn centered on an arbitrary point of the nonwoven fleece. It is the ratio of the number of cross sections of the constituent fibers on each side when the difference is maximum.