JPH047170Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a sealing tape for waterproof fabrics, and in particular, the present invention relates to a sealing tape for waterproof fabrics, and in particular, a sealing tape with a microporous polymer membrane sandwiched between a front material and a lining material in a sandwich-like manner. The present invention relates to a sealing tape suitable for layered waterproof fabrics. [Prior art and its problems] Waterproof fabric, which is constructed by coating one side of a base fabric with a microporous polymer membrane such as polyurethane, has not only waterproof properties but also moisture permeability. It is used as a material for ski wear, mountain climbing clothing, etc. When sewing the above-mentioned clothing from such a waterproof fabric, a waterproof sealing tape is attached to the seam portion to prevent water from leaking from the seam portion. On the other hand, since the polymer membrane of the above-mentioned waterproof fabric has a rubber-like cooling sensation, in order to eliminate this cooling sensation, a fabric such as woven or knitted fabric is pasted as a lining on the surface of the polymer membrane. A waterproof fabric has been proposed in which a polymer film is sandwiched between the lining and the base fabric in a three-layer structure in the form of a sandwich. However, in sewn products made from such three-layer waterproof fabrics, the sealing tape for the seams is not attached directly to the polymer membrane, but rather to the lining (fabric). In order to become
There is a gap between the sealing tape and the polymer film due to the texture of the fabric. For this reason, there is a problem in that moisture that has entered the seam of the seam passes through the gap in the lining and reaches the back side, making it difficult to achieve a complete seal. [Purpose of the invention] The purpose of the invention is to provide a sealing tape that solves the above-mentioned conventional problems and enables reliable sealing even with a three-layer waterproof fabric. [Structure of the invention] In order to achieve the above object, the present invention has a melting point in the base fabric.
A base layer made of high melting point polyurethane with a temperature of 140°C or higher is provided, and an adhesive layer made of a low melting point polyester or low melting point polyamide with a melting point of 110 to 130°C and a melt viscosity of 10 ⁷ poise or less at the melting point is provided. This is a characteristic feature. FIG. 1 is a longitudinal sectional view showing an example of the sealing tape according to the present invention described above. This sealing tape 5
is constructed by providing a base layer 2 of high melting point polyurethane on a base fabric 1, and further laminating low melting point polyester or low melting point polyamide on this base layer 2. The base fabric 1 is
Although the structure may be such that it is bonded to one side of the base layer 2 as shown in the figure, it may also be embedded in the base layer 2. The base fabric used in the sealing tape of the present invention is a thin woven or knitted fabric made of synthetic fibers such as polyamide and polyester.
It is preferable that the material has appropriate elasticity. As the weave structure of such a stretchable fabric, it is preferable to use bias-cut taffeta or gauze. Its elasticity is 10-50%/1.8Kg/2
The width is preferably in the cm width range, and the thickness is preferably 200 μm or less. The base layer used in the sealing tape of the present invention must be made of polyurethane with a high melting point of 140°C or higher. Moreover, the thickness of the base layer is preferably 30 to 50 μm. By using polyurethane as the base layer in this way, it is possible to give the sealing tape high elasticity, and by making this polyurethane have a high melting point of 140°C or higher, when the adhesive layer is bonded. The above-mentioned elasticity can be prevented from being inhibited even by heat treatment. The adhesive layer in the sealing tape of the present invention is easily melted when heated by hot air, high frequency, ultrasonic waves, etc., thereby easily performing adhesive action. As such an adhesive layer, polyester or polyamide having a melting point of 110 to 130° C. and a melt viscosity of 10 ⁷ poise or less at the melting point is used. By setting the melting point to a low value of 110 to 130°C as described above, it is possible to prevent not only the base layer from being damaged but also the waterproof fabric during the adhesive treatment by heating. In addition, polyester or polyamide has a higher affinity for fibers in general, regardless of the type of fiber used for the lining of waterproof fabric, than polyurethane, which is used in the adhesive layer of conventional sealing tape. , the permeability and adhesion to the lining can be improved. However, by setting the melt viscosity at the melting point to 10 ⁷ poise or less, it is possible to increase the fluidity, and this, combined with the above-mentioned affinity for the fibers, allows it to easily penetrate into the lining of the waterproof fabric, and furthermore, microporous polymer membranes can be easily reached. Therefore, it is possible to completely fill the gaps in the backing tissue, thereby perfecting the sealing performance and exhibiting a high adhesive effect. Furthermore, in order to obtain sufficient sealing and adhesion effects by the adhesive layer, the thickness should be at least
The thickness is preferably 100μ or more. If this thickness is too thin, depending on the thickness of the waterproof fabric lining, it may not be possible to fill the gaps in the lining tissue sufficiently, and the microporous polymer membrane inside may not be able to be reached. This is because there is a risk that it will disappear.
However, if it is too thick, the capacity of the adhesive will be too large, which will reduce the stretch back properties of the sealing tape after cooling and solidifying.
It is desirable to set the upper limit to . FIG. 2 shows a case where the sealing tape of the present invention is applied to the seam portion of a sewn product made of a three-layer waterproof fabric. 20 is a waterproof fabric with a three-layer structure, and the outer material 21
and a lining 22, with a microporous polymer membrane 23 sandwiched therebetween in a sandwich-like manner. The two waterproof fabrics 20, 20 have sewing thread 25
A stitched portion 24 is formed by stitching, and the back side of this stitched portion 24 is pasted with a sealing tape 5 according to the present invention. The adhesive layer 3 of this filler tape 5 is pasted on top of the lining 22, but it penetrates into the lining 22 by melting during the fusion process and fills the gaps in the tissue. It also reaches the inner polymer film 23. In the sutured portion 24 adhered by such sealing tape 5, moisture infiltrates from the seam of the sutured portion 24 (from above in FIG. 2), and furthermore,
5 and reaches the lining 22. In order to prevent moisture from penetrating in this way, in the case of items pasted with conventional sealing tape, gaps are formed in the fabric structure within the lining 22, so moisture cannot penetrate through the lining 22. Water was leaking because it leaked out to the back side. However, when pasting with the sealing tape 5 of the present invention, the low melting point polyester or polyamide of the adhesive layer 3 of the sealing tape 5 penetrates into the tissue gap of the lining 22 and becomes a filling state. Moisture is dammed up by this lining 22 and is no longer able to infiltrate inside. This results in a complete seal and strong adhesion. In addition, in the above example, the case of a waterproof fabric with a three-layer structure that provides a particularly remarkable effect was explained.
The sealing tape of the present invention can of course be effectively used for two-layer structure and other waterproof fabrics. [Effects of the invention] The sealing tape of the invention has a melting point as a base layer.
Made of polyurethane with a high melting point of 140℃ or higher,
It can impart high elasticity to the sealing tape, and because of its high melting point, it does not lose its elasticity during heat bonding treatment. In addition, as the adhesive layer is made of low melting point polyester or low melting point polyamide with a melting point of 110 to 130°C and a melt viscosity of ¹⁰⁷ poise or less, it goes without saying that the base layer will not be damaged during the heat bonding process. This can be done to avoid damaging the waterproof fabric. In addition, polyester and polyamide in the adhesive layer have a higher affinity for other fibers than polyurethane, and their melt viscosity at the melting point is less than 10 ⁷ poise, so they exhibit high fluidity, even if the lining is Even when applied to sewn products using a three-layer waterproof fabric, the adhesive layer can penetrate the lining and fill in the gaps, ensuring a reliable seal at the seam. It becomes possible. [Example] A gauze fabric made of 30d polyester was coated with a polyurethane resin having a melting point of 170°C to form a film of 40μ. This coating surface has a melt viscosity at a melting point of 120℃.
10 Thickness made of ⁷ poise polyester resin
A 200μ film was laminated. This three-layer structure was wound up onto a paper tube while peeling off the gauze fabric.
This paper tube was cut into rings with a width of 20 mm to obtain a sealing tape consisting of a low melting point resin layer and a high melting point resin layer. Next, a porous polyurethane membrane is laminated on the back side of the outer material, and a three-layer waterproof and breathable fabric ("Entrant-α" 31ager product) is sewn with a 0.7cm seam allowance. Then, a sewn product was made by turning the seam allowance to one side and stitching with a seam allowance of 5 mm, and the tape was pasted on the back side of the seam. As mentioned above, the water pressure resistance of the parts adhered to the seams of each three-layer waterproof and permeable fabric is summarized as follows: Comparison data between the adhesive tape of the present invention and the conventional adhesive tape (adhesive layer: low melting point polyurethane resin) is summarized. The table became as shown below. In other words, with conventional tapes, the adhesive resin layer does not reach the polyurethane porous membrane of the three-layer waterproof and permeable fabric, but with the present product, the adhesive resin layer penetrates through the lining.
The polyurethane porous membrane in the middle layer provides complete waterproofness to the seams. 【table】

* Conventional product: Adhesive layer is polyurethane

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a sealing tape according to an embodiment of the present invention, and FIG. 2 is a longitudinal cross-sectional view showing an example of the use of the sealing tape for a waterproof fabric having a three-layer structure. 1...Base fabric, 2...Base layer, 3...Adhesive layer,
5...Filling tape.

Claims (1)

[Scope of claims for utility model registration] (1) A base layer made of high melting point polyurethane with a melting point of 140°C or higher is provided on the base fabric, and a base layer with a melting point of 110 to 130°C is provided.
1. A sealing tape for waterproof fabric, characterized in that it has an adhesive layer made of a low melting point polyester or a low melting point polyamide having a melt viscosity of 10 ⁷ poise or less at the melting point at °C. (2) The sealing tape for waterproof fabric according to claim 1, wherein the adhesive layer has a thickness of 100 to 150μ. (3) The sealing tape for waterproof fabric according to claim 1, wherein the base layer has a thickness of 30 to 50μ.