JPS62183704A - Heat sealable plane fastener - 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 Application Field) The present invention relates to improvements in hook-and-loop fasteners known as Velcro tape (registered trademark) and the like, and more specifically relates to hook-and-loop fasteners that can be hot-melt bonded.

(Prior Art) Hook-and-loop fasteners that engage a hook-shaped, mushroom-shaped, or umbrella-shaped engagement element with a loop-shaped retaining element are widely used for various purposes, and the hook-and-loop fastener is used to fix the hook-and-loop fastener to another fiber cloth or the like. Methods used include sutures, adhesives, and ultrasonic welding. These methods have problems such as being time-consuming, having insufficient adhesive strength, and requiring expensive equipment.
be. As another method of fixing, a technique of joining using a hot melt adhesive is also widely known. Although it is conceivable to use hot-melt adhesives as a method of fixing hook-and-loop fasteners, there are no conventional hot-melt adhesives suitable for thermally adhering hook-and-loop fasteners, and none that can actually be used.

(Problem to be solved by the invention) In order to fix a hook-and-loop fastener with a hot-melt adhesive, it is necessary to have sufficient adhesiveness at a temperature that does not affect the shape or strength of the retaining element of the hook-and-loop fastener, and to ensure durability. As a result of selecting and testing various hot melt adhesives that satisfy these conditions, the present inventors found that hook-and-loop fasteners using specific hot-melt adhesives are suitable for thermal bonding. They discovered that it is excellent as a fastener and completed the present invention.

(Means for Solving the Problems) That is, the present invention uses a thermoplastic organic polymer as a main component on the back side of a hook-and-loop fastener, and has a viscosity of 150 to 2500 poise (hereinafter referred to as ps) at a softening point of 100 to 150°C and 190°C. This is a surface fastener that can be thermally bonded and is provided with a hot-melt adhesive layer.

The hook-and-loop fastener in the present invention includes a hook-shaped hook-and-loop fastener in which synthetic fiber filaments such as nylon or polyester are woven into a hook shape, and a mushroom-shaped hook-and-loop fastener in which a mushroom-shaped or umbrella-shaped engagement element is woven in place of the hook body. Further, there is included a hook-and-loop fastener constructed by integrally molding the hook body or the mushroom-shaped engaging element with synthetic resin instead of the woven construction. Hook and loop fasteners also include those having a loop-shaped retaining element that engages with the hook body or mushroom-shaped engagement element.

The loop body is a ring made of thin multi-filament strands or long fibers with piles, and woven fabrics, flocked fabrics, non-woven fabrics, etc. having these on the surface can be used as hook-and-loop fasteners. In the present invention, a hot-melt adhesive layer number for bonding is provided on the back surface of the hook-and-loop fastener, that is, the surface that does not have an engaging element.

The hot-melt adhesive used in the present invention contains a thermoplastic organic polymer as a main component, and additionally contains a tackifier, a filler, etc. as necessary.

Preferred thermoplastic organic polymers include, but are not limited to, ethylene-ethyl acrylate copolymers, copolyamides, styrene-isoprene block polymers, and styrene-ethylene-butadiene block polymers.

The hot melt adhesive must be sufficiently softened and active at the bonding temperature and at the same time must have an appropriate viscosity. If the viscosity is too high, the adhesive will not flow into the gaps between the fibers of the adhered object, resulting in insufficient adhesion; if the viscosity is too low, the adhesive will penetrate and penetrate the fiber fabric during the bonding process. This is unsuitable, as adhesion becomes incomplete and the fiber fabric bleeds. Evaluated from these points, the hot melt adhesive that can be used in the present invention needs to have a softening point of 100 to 150°C and a viscosity of 150 to 2500 ps at 190°C.

The thermal bonding temperature for bonding the hook-and-loop fastener having the hot-melt adhesive layer of the present invention to another fiber cloth, etc. is preferably 120 to 190° C. from the viewpoint of the heat resistance of the fiber cloth, etc.

(Effects of the Invention) The hook-and-loop fastener according to the present invention is obtained by applying the above-mentioned hot-melt adhesive to the back side of the hook-and-loop fastener in advance by a conventional method, overlaying another fiber cloth, etc. on the hot-melt adhesive layer, and applying a predetermined layer on top of the hot-melt adhesive layer. Press with an iron at a temperature of . A strong bond with a peel strength of 5.0 or more than 9725 forehead width can be obtained by such thermal bonding treatment.

Moreover, the adhesion did not show any substantial decrease in water washing with the addition of a conventional synthetic detergent.

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

Example hook-shaped retaining element The back side of a hook-shaped fastener with gold (■ Velcro Tape (registered trademark) manufactured by Kuraray) had a softening point of 130°C and 1
Approximately 200 g of hot melt adhesive (Hibon 9925 manufactured by Hitachi Chemical Polymer ■) with a viscosity of 550 ps at 90°C
It was melted and applied in an amount of On top of the hot melt adhesive layer is a blended fabric of 65% polyester and 35% cotton (basis weight 200).
9/rd) was placed on top of that and pressed with an iron (1.3 to 1.51t9) for 115 seconds at 145°C.

The hook-like fastening element of the hook-and-loop fastener thermally bonded to the blended fabric has no change in shape, and the weight is 6.0 kg/25
It exhibited a peeling strength of tm width.

Comparative Example 1 Instead of the hot melt adhesive used in the example, softening point 1
Using a hot melt adhesive (HL-205-99-3 manufactured by Nippon Fuller Co., Ltd.) with a viscosity of 80 p3 at 24°C and 190°C, a hook-and-loop fastener with hot melt adhesive was produced under the same conditions as in the example, 125℃, 5 on the same blended woven fabric
Heat bonded with a second iron (1.3-1.5#).

Although its peel strength was 5.7 kq 725 m width, the adhesive penetrated into the woven fabric frequently, making it unsuitable as a hot melt adhesive for thermal adhesive surface fasteners.

Comparative Example 2 A solvent-type hot melt adhesive (Fallon 513 manufactured by Toyo Polymer Co., Ltd.) with a viscosity of 50 ps/25°C was applied to the back side of the same hook-and-loop fastener as used in the example.
It was applied in an amount of 97d dry. On top of this hot melt adhesive layer, the same blended woven fabric as used in the example was layered,
It was then pressed with an iron at 140°C for 510 seconds.

Its peel strength was as low as 1.4 to 9/25 jff width, which was insufficient for the purpose of the present invention.

Claims (1)

[Claims] A heat-adhesive hook-and-loop fastener characterized in that a hot-melt adhesive layer containing a thermoplastic organic polymer as a main component and having a softening point of 100-150°C and a viscosity of 150-2500 poise at 190°C is provided on the back side of the hook-and-loop fastener. .