JP3214767B2 - Hook-and-loop fasteners with different engaging forces depending on the direction - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hook-and-loop fastener having different engaging forces depending on directions, and more particularly to a hook-and-loop fastener having different engaging forces depending on directions, which can be suitably used for sanitary or medical devices.

[0002]

2. Description of the Related Art A hook-and-loop fastener used for a reusable diaper of an infant or the like is disengaged from the mating surface of the other party with a discomfort sound when the force is applied to release the engagement. . This hinders infants' sleep.

[0003] In addition, if a large force is required to release the engagement, the mushroom portion at the tip of the stem may be removed from the stem and an infant may put it in the mouth. Occurs.

On the other hand, to stop diapers for infants,
Adhesive tapes are used, but the adhesion function is greatly reduced if the powdered radish adheres to the commonly used adhesive portion.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to reduce unpleasant noise upon disengagement, which is a drawback of the conventional hook-and-loop fastener, and to improve safety or hygiene.

[0006] Another object of the present invention is to provide an alternative product which eliminates the drawbacks of the adhesive tape used for diapers for infants.

[0007]

In view of such circumstances, the present inventors have made intensive studies and as a result, unexpectedly, by changing the implantation angle of the stem with respect to the base material from the conventional one, the above-mentioned problem has been surprisingly obtained. Was found to be solved, and the present invention was completed.

That is, the present invention provides a hook-and-loop fastener having a different engaging force depending on the direction in which the stem is planted obliquely with respect to the base material.

The present invention will be described below with reference to the drawings. FIG. 1 is a schematic sectional view of the hook-and-loop fastener of the present invention,
FIG. 2 is a schematic sectional view when the surface fastener of the present invention is engaged with a mating surface.

In the conventional hook-and-loop fastener, it has been common sense to implant the stem perpendicular to the base material. In the present invention, however, the stem is implanted obliquely to the base material as shown in FIG. .

When the stem is planted obliquely with respect to the base material,
Unexpectedly, it was found that the engagement was easily released, and at that time, the generation of unpleasant noise was suppressed, while the shear strength was kept high.

Referring to FIG. 1, a hook-and-loop fastener (1) of the present invention comprises a substrate (2) and a stem (3) which is obliquely implanted on the substrate. As the base material, those conventionally used can be used.For example, as the material thereof, a multifilament of nylon, polyester, or polypropylene, or a binding double woven method made of elastic yarn such as spandex, A woven fabric, a knitted fabric, or the like by a double Russell knitting method can be used.

It is essential that the stem be planted obliquely with respect to the base material. However, a stem, such as a woven fabric or a knitted fabric, which is produced by a binding double weaving method, a double Russell knitting method, or the like, can be used. It can also be made utilizing, or can be skewed, for example by passing it between a heated metal roll and a rubber roll after planting it upright on a substrate as is conventional. Examples of the material of the stem include polypropylene, nylon, and polyester. From the viewpoint of productivity, monofilaments thereof are desirable.

Here, in the case of the hook-and-loop fastener, a mushroom shape is usually given to the tip of the stem in order to enhance the engagement. However, in the hook-and-loop fastener of the present invention, the object is achieved without giving such a mushroom shape. It turned out to be. This is because the shear strength can be achieved without a mushroom.

When the material of the stem is nylon or polyester, it is desirable that the tip of the stem has a candle-like roundness. This is because the contact feeling when human skin comes into contact is good and there is no uncomfortable feeling.

Referring to FIG. 2, when the hook-and-loop fastener of the present invention is engaged with a mating surface, for example, the shear engagement force (shear strength) in the direction of arrow a in FIG.
Since the peel strength in the direction of arrow b is weak, it can be easily peeled. As described above, the surface fastener of the present invention is largely characterized in that the engaging force varies depending on the direction. Further, when the base material is made of elastic yarn, the mating surface can be sufficiently engaged even if the mating surface exists on the curved surface.

Thus, in the hook-and-loop fastener of the present invention, the mating surface includes a pile surface, a nonwoven fabric, a sparse fabric, and the like.
It can be suitably used for sanitary or medical uses such as fixing of diapers for the elderly, osme covers, bandages and the like.

[0018]

The present invention will be described in more detail with reference to the following examples. Example 1 A multifilament 250 ^d yarn made of polyester was used for warp knitting of a base fabric, and 6 nylon monofilaments having a thickness of 300 ^d were used as thermoplastic monofilaments for pile yarn. While knitting the base cloths, monofilaments were connected between the base cloths so that the length of the connecting portion was 8 ^mm .

The monofilament was cut at the center of the connecting portion to obtain a cut pile sheet having a monofilament height of 4 ^mm .

Next, the tip of the monofilament extending upright from the structure was heated with a heater at a temperature of 650 ° C., so that the tip of the monofilament had a candle-like roundness.

Further, this was passed between a metal roll and a rubber roll heated to about 200 ° C. in order to incline the monofilament at an angle of about 45 ° in a certain direction in the flow direction of the warp knitting machine.

When this surface fastener engages with a loop-shaped B-surface fastener or nonwoven fabric, if the monofilament engages with the B-surface fastener or nonwoven fabric at an acute angle, the shear strength is very large, while the latch strength ( Peel strength) showed a very small value. Further, no unpleasant noise peculiar to the hook-and-loop fastener when releasing the engagement was generated.

[0023]

According to the present invention, there can be provided a hook-and-loop fastener which can easily release the engagement, does not generate any unpleasant sound at that time, and has a large shear strength.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a surface fastener of the present invention.

FIG. 2 is a schematic cross-sectional view when the surface fastener of the present invention is engaged with a mating surface.

[Description of Signs] 1: Surface fastener, 2: Base material, 3: Stem

────────────────────────────────────────────────── ─── Continuation of the front page (56) References Japanese Utility Model Application Hei 4-93603 (JP, U) International Publication 93/25 (WO, A1) US Patent 4,376,152 (US, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) A44B 18/00 A61F 13/49 A61F 13/56 A61F 13/66

Claims (1)

(57) [Claims] 1. A hook-and-loop fastener having a different engaging force depending on a direction in which a stem made of a monofilament is obliquely implanted in only one direction with respect to a substrate, and a tip of the stem has a candle-like roundness.