JPH07107220B2 - Waterproof reinforcement method for sewn products using 3-layer waterproof fabric - Google Patents

Description

TECHNICAL FIELD The present invention relates to a waterproof reinforcement method for a sewn product using a waterproof fabric having a three-layer structure.

[Background Art] Recently, products such as ski wear, golf wear, windbreakers, fishing clothing, and mountain climbing rain gear, which use a breathable waterproof fabric made by coating a polyurethane resin or the like on a knitted fabric, have been developed. Since these moisture-permeable waterproof sewn products are excellent in water repellency and also in moisture permeability, they are comfortable to wear without slumping.
However, such a breathable waterproof sewn product also has a problem common to other sewn products that rainwater invades from the seam and leaks. In order to prevent this, the seams are usually sealed. For this stop,
A sealing tape or the like in which a resin or the like is coated on a woven fabric is usually used.

However, as shown in FIG. 1, in the seam 5 of the sewn product 4 using the waterproof fabric having a three-layer structure in which the waterproof and moisture permeable membrane 1 is formed in the middle layer and the outer and outer layers are the outer fabric 2 and the inner fabric 3, Rainwater penetrated through the holes 6 of the eye 5 and was difficult to waterproof. That is, when the conventional sealing tape is used, as shown in FIG. 2, the resin adhesive 9 coated on the cloth 8 of the sealing tape 7 is plasticized by the heating of the adhesive M / C and flows. Even if the state is reached, it does not penetrate between the textures of the knitted fabric of the lining 3 and is merely stopped in the state of being adhered to the convex portions 10 in a dot shape. Therefore, many gaps are formed between the lining 3 and the sealing tape 7. Therefore, when the sewn product 4 is used as a rain gear in such a state, there is a problem that rainwater or the like enters the inside of the lining 3 through the hole 6 of the seam as shown by an arrow. Atsuta

[Object of the Invention]

The present invention has been made in view of such circumstances,
It is an object of the present invention to provide a waterproof reinforcement method in which rainwater does not infiltrate at all even in a seam portion which is a seam of a sewn product using a three-layer structure waterproof fabric.

[Disclosure of Invention]

The inventors diligently studied to achieve the above object.
As a result, the present invention has been completed.

This invention is to seal a seam portion of a sewn product using a waterproof fabric having a waterproof and moisture permeable membrane in the middle layer and outer and outer layers made of knitted fabric, and a back layer is made of a low melting point resin film. The low melting point resin film side of the configured multi-layered sealing tape is brought into contact with the lining side of the sewn product for heat treatment, and the melt of the low melting point resin film is passed through the lining to reach the waterproof and moisture permeable membrane as the middle layer. In this way, the gist is a waterproof reinforcement method for a sewn product using a three-layer waterproof fabric, which is characterized in that the sealing tape is adhered to the sewn product. This will be described in detail below with reference to the drawings showing an embodiment thereof.

FIG. 3 is a side sectional view showing an embodiment of a sealing tape used in the present invention. As shown in the figure, the sealing tape 11a has a two-layer structure in which a high melting point resin film 12 and a low melting point resin film 13 are bonded to each other, and has a stretchability.

The low melting point resin film 13 of the sealing tape 11a is used so as to be in contact with the cloth. Low melting point resin film 13
It has a film shape at room temperature, but when heated above a certain temperature, it plasticizes and becomes in a fluidized state, closing the holes of the seam of the cloth and covering and welding the entire seam allowance portion and its vicinity. Therefore, the low melting point resin also fills the gaps in the cloth. On the other hand, the high melting point resin film 12 of the sealing tape 11a is located on the front side of the low melting point resin film 13,
It works as follows.

High melting point resin film has excellent wear strength, so
Protects the low melting point resin film that is soft and weak, and prevents damage to the low melting point resin film.

When the sealing tape is formed only with the low melting point resin film, the seams are exposed on the surface of the low melting point resin film when heat fusion is performed and water leakage occurs from that portion, but the high melting point resin film is overlapped. In this case, this high melting point resin film blocks water leakage and completely waterproofs it.

When only the low melting point resin film is used, the films adhere to each other and are re-adhered during storage of the sealing tape or when the sealing tape is overlapped and used. The high melting point resin film prevents this.

The high-melting-point resin film has a flat surface on the uneven portion formed when the low-melting-point resin film is melted.

The high melting point resin film prevents the melted low melting point resin film material from adhering to the heating means and deteriorating workability when the low melting point resin film is fused.

The low melting point resin film as used herein means a resin having a melting point of 140 ° C. or lower and a melt viscosity of 10 ⁷ poise or lower. The high melting point resin film has a melting point of 140 ° C. or higher. Resins such as polyurethane, polyamide, polyester and polyacryl can be used as the material of the low melting point resin film and the high melting point resin film, but a polyurethane resin having a high affinity with the waterproof and moisture permeable film in the middle layer of the sewn product is particularly preferable. It is preferably used.

As for the thickness of the tape, the low melting point resin film is 150-250
μ, high melting point resin film is preferably used in the range of 50 to 200 μ. If the thickness of the low melting point resin film is less than 150 μ, it is not enough to fill the gaps in the cloth. Also, 250
When it exceeds μ, it sticks out laterally from the tape when it is fused and it becomes unattractive, resulting in poor workability. If the thickness of the high melting point resin film is less than 50 μm, the abrasion resistance is reduced. Also, 20
If it exceeds 0 μ, the part becomes too thick and hard.

Since the sealing tape used in this invention has the stretchability, it can sufficiently follow the bending of the seams,
Moreover, it is possible to follow the stretchability of a sewn product having stretchability.

If the stretch ratio of the sealing tape is large, the tape is likely to be stretched when it is slit and wound up, when it is pulled out from the tape reel in the contact length M / C, or when pressure is applied by the pressure roller. . As a result, the water pressure resistance of the seams is reduced and variations occur due to washing shrinkage due to uneven adhesion, residual strain, and the like. This causes the puckering of the seam. Further, when the stretch ratio is small, it does not fit in the curved seam and causes tacks and wrinkles, and the water pressure resistance of the seam decreases. Therefore, the preferred stretch rate is 10 to 40% / kg / 2cm, and more preferably 15 to 30% / kg / 2cm.

FIG. 4 is a side sectional view of an essential part showing an embodiment of a waterproof reinforcement method for a sewn product using the waterproof cloth having a three-layer structure according to the present invention. The eyesight shown in this figure is performed as follows. That is, in order to completely cover the seam, the seam allowance portion and the vicinity thereof of the sewn product 4, the sealing tape 11a shown in FIG. While being placed on the seam of the sewn product 4, the lining 3 is heated by heating the sealing tape 11a from the high melting point resin film 12 side using a heating device such as a heat roller type machine, a hot air type machine, or an iron. Crimp. Then, the low-melting resin film 13 is melted into a plastic flow state and penetrates between the tissues of the knitted fabric of the lining 3 to reach the middle layer waterproof / moisture permeable membrane 1. As a result, the low-melting-point resin film 13 closes the holes 6 in the seam and also fills the gaps in the lining 3 and fuses them to complete the filling.

Since the seams of the sewn product using the waterproof cloth having the three-layer structure which is waterproof and reinforced by the sealing are surely sealed, rain and the like will not enter at all.

In consideration of the penetration of the low melting point resin film, the lining of the three-layer waterproof cloth has a basis weight of 10 to 60 g / m ² and a breathability of 500 to 10
It is preferably 00 cc / cm ² / sec and a thickness of 100 to 250 µ. In addition, it is preferable to use water-repellent processed sewing threads.

The sealing tape used in the present invention is not limited to the sealing tape 11a shown in FIG. 3 as long as it has a multi-layered structure in which the back surface layer is made of a low melting point resin film, and the sealing tape shown in FIGS. Those shown in can also be used. That is, the sealing tape 11b shown in FIG. 5 is one in which irregularities are formed on the surface of the high melting point resin film 12 of the sealing tape 11a shown in FIG. Sealing tape 11 shown in FIG.
Reference character c denotes a release tape 14 affixed to the high melting point resin film side of the sealing tape 11a shown in FIG. This sealing tape 11c is heated and pressure-bonded from above the release paper 14,
The procedure is the same as in the case of FIG. 3 except that the release paper 14 is used by peeling it off. The sealing tapes 11d and 11e shown in FIGS. 7 and 8 are obtained by attaching the cloth 15 to the high melting point resin film side of the sealing tapes 11a and 11b shown in FIGS. Sealing tape 11f shown in Fig. 9
Is a laminate of the impregnated cloth 15 of the low melting point resin film 13 and the high melting point resin film 12. Also, besides this,
Instead of the high-melting-point resin film, an adhesive having a strong adhesive property and a waterproof property may be used, and a cloth and a low-melting-point resin film may be bonded together. It is preferable to use, as the cloth attached or adhered to the sealing tape, one having stretchability. The above sealing tape prevents the blocking of the low melting point resin film and the high melting point resin film, which is likely to occur when the sealing tape is wound into a roll due to the release paper, the cloth, and the convex and concave portions. can do.

Examples will be described below.

Example 1 Polyester 30d gauze fabric, 100 parts by weight of polyurethane resin Crisbon 7667HV (manufactured by Dainippon Ink and Chemicals, Inc.) having a melting point of 170 ° C. (hereinafter abbreviated as “part”), 80 parts of dimethylformamide,
Dairatsu White TD-2100 (manufactured by Dainippon Ink and Chemicals) 15
Part, 5 parts of block isocyanate Vernotk D-500 (manufactured by Dainippon Ink and Chemicals, Inc.), and then squeezed from both sides with a doctor blade to impregnate to about 160 g / m ² and then left for 5 minutes. A cloth having a porous urethane coating on both sides of a gauze fabric was prepared. Next, polyurethane resin Pandex T-5102 with a melting point of 125 ° C extruded from the T-die
The film of (A) having a thickness of 200 μ was laminated.

As a result, a sealing sheet was obtained in which the low melting point resin film and the high melting point resin impregnated cloth were bonded together. This sheet was split to a width of 20 mm in the 45 ° bias direction to form a sealing tape roll.

Next, the outer material is nylon taffeta, and the entrant fabric (made by Toray Co., Ltd.) that has a waterproof and permeable membrane on the back side is used as a lining material, using nylon for the front yarn and back yarn for 20d. Wale 25 pcs / 2.54 cm, course 28 A entrant 3-layer fabric (manufactured by Toray Industries, Inc.) with a finish density of book / 2.54 cm, a basis weight of 22 g / m ² and an air flow rate of 973 cc / cm ² / sec and a thickness of 0.2 mm of tricot knit fabric is attached to the outer membrane surface. Two fabrics were sewn together under the sewing conditions shown in Table 1 to be used as a material. The low melting point resin film side of the sealing tape was brought into contact with the lining side of the entrant fabric on the seam so as to completely cover the seam and the seam allowance, and heat bonding was performed under the bonding conditions shown in Table 2. As a result, the low-melting point resin is plasticized and becomes a fluidized state, closing the holes in the stitches of the fabric and penetrating between the stitches of the lining to reach the middle layer film surface, and the entire seam allowance portion and its vicinity are covered and melted. It was worn.

When the water pressure resistance of this sample was measured by the Shipper type water pressure resistance test, it was found that the water pressure resistance was practically no problem as shown in Table 3A. In addition, dry cleaning (petroleum-based) 3 times and water washing (10 minutes washing) 5 times were performed to investigate the durability of the water leakage prevention effect from the seam part. The value of the value decreased, but this was also a level with no practical problems.

[Example 2] 70 denier polyester, 112 vertical / 2.54 cm, horizontal 87
A taffeta fabric having a density of /2.54 cm was dipped in a 0.8% water repellent solution of a fluorine-based water repellent Asahi Guard AG710 (a product of Asahi Glass Co., Ltd.). Then, after deliquoring and drying with a 40% squeeze, melting point 230 ° C
Polyurethane resin Crisbon 8530 [Product of Dainippon Ink Co., Ltd.] 100 parts, dimethylformamide 55 parts, Dailac White TD-2100 [Product of Dainippon Ink Co., Ltd.] is applied and dipped in water. Then, it was squeezed five times with a roll to elute the solvent in water, and then dehydrated and dried.

After that, the polyurethane pandex T5102 with a melting point of 125 ° C extruded from the T-die onto the resin surface of the coating fabric.
A film having a thickness of 250 μm (A) was laminated. Then 2
After pressing with a book roll, the polyester taffeta is peeled off to form a two-layer film having a high melting point porous uneven polyurethane layer 12 and a low melting point urethane resin layer 13 as shown in FIG. Was slit to a width of 22 mm to obtain a sealing tape.

Next, the outer material is nylon tricot, and the front material 30d, and back material 20d using nylon as the lining for the entrant fabric (made by Toray) with the waterproof permeable membrane on the back surface.
Use 28 wales / 2.54cm, 27 courses / 2.54cm finish density, basis weight 30g / m ² , ventilation 775cc / cm ² / sec thickness 0.22
3 layers of entrant fabric (made by Toray) in which a tricot of mm is attached to the film surface of the outer material is used as a material,
Two fabrics were sewn together under the same sewing conditions as shown in Table 1. While making the low melting point resin film side of the sealing tape on the seam (seam) the lining side of the entrant fabric so as to completely cover the seam and the seam allowance part,
Similarly, heat bonding was performed under the conditions shown in Table 2 of Example 1. At this time, the low-melting point resin became a plasticized fluidized state, blocked the holes of the seam of the fabric, penetrated between the stitches of the lining and reached the film surface as the middle layer, and the entire seam passage and its vicinity were fusion-bonded with the coating. .

When the water pressure resistance of this sample was measured by a shocker type water pressure resistance test, the water pressure resistance was practically no problem as shown in Table 4A. In addition, dry cleaning (petroleum-based) 3 times and water washing (10 minutes washing) 5 times were carried out, and the durability of the effect of preventing water leakage from the seam was investigated. The value of the value decreased, but this was also a level with no practical problems.

[Comparative Example 1] The sealing tape described in Example 1 was used, and then the entrant fabric whose outer material was nylon taffeta (manufactured by Toray Industries, Inc.)
As a lining, nylon is used and front yarn and back yarn are used for 40d, wale 34 yarns / 2.54cm, course 37 yarns / 2.54cm, finish density, basis weight 72g / m ² , air flow 393cc / cm ² / sec thickness
An entrant three-layer fabric (manufactured by Toray Co., Ltd.) in which a 0.39 mm tricot knitted fabric was attached to the film surface of the outer fabric was used as a material, and two fabrics were sewn together under the sewing conditions shown in Table 1 of Example 1. . The low melting point resin film side of the above-mentioned sealing tape is used as the lining side of the entrant fabric on the seam (seam) so as to completely cover the seam and the seam allowance, and shown in Table 2 of Example 1. Heat bonding was performed under the conditions. At this time, the low melting point resin of the sealing tape is plasticized to be in a fluidized state, but the lining of the entrant fabric is fluidized because the raw yarn used is thick and the finished density is high as described above, and the fabric is also thick. The resin does not penetrate the lining enough to reach the middle layer, the membrane surface. Therefore, the sealing tape was not sufficiently adhered as in Examples 1 and 2.

The water pressure resistance of this sample was measured by the Shipper type water pressure resistance test. The water pressure resistance of the seam with the sealing tape was 180 mmH ₂ O.
It was very low and not suitable for practical use.

[Comparative Example 2] A commercially available sealing tape (a nylon tape with a low melting point polyurethane adhesive resin coated to a thickness of about 80μ) was used, and the lining described in Example 1 was used as the outer surface of the film surface. The three-layered entrant fabric (manufactured by Toray Industries, Inc.) attached to the above was used as a material, and Example 1 was used.
Two cloths were sewn together under the same sewing conditions as shown in Table 1 above. The condition shown in Table 2 of Example 1 is also applied to the seam (seam) so that the adhesive resin surface side of the above-mentioned sealing tape is the lining side of the entrant fabric so that the seam and the seam allowance portion are completely covered. It was heated and adhered. At this time, the low melting point adhesive resin of the sealing tape is plasticized into a fluid state, but the amount of adhesive resin is small as can be seen from the coating thickness of 80μ, and the fineness of the raw yarn used as the lining,
In view of the finish density, air flow rate, fabric thickness, etc., it was not possible to obtain sufficient adhesive force despite the fact that the adhesive resin has sufficient characteristics to penetrate.

The water pressure resistance of this sample was measured by the Shipper type water pressure resistance test. The water pressure resistance of the seam with the sealing tape was 185 mmH ₂ O.
It was very low and not suitable for practical use.

[Effects of the Invention] A waterproof reinforcement method for a sewn product using the three-layer waterproof fabric according to the present invention is applied to a low-melting resin film side of a multi-layered sealing tape having a low-melting resin film as a back layer. By contacting the lining of the sewn product with heat and pressure, the melted resin film in the plasticizing fluidized state of the low-melting resin film is allowed to reach the middle layer waterproof / moisture permeable membrane through the texture of the knitted fabric of the lining. Since the sealing tape is adhered to the sewn product, the low melting point resin film is melted by heating to close the hole of the sewn product seam, and the entire seam allowance portion and its vicinity are sufficiently fusion-coated. For this reason, the seams and gaps in the lining are blocked, so rainwater etc. will not enter,
Can be completely waterproof.

[Brief description of drawings]

FIG. 1 is a perspective view showing a seam of a sewn product using a three-layer structure waterproof fabric, and FIG. 2 is a view showing a conventional sealing state for the seam of a sewn product using a three-layer structure waterproof fabric. 3 is a side sectional view showing an embodiment of a sealing tape used in the present invention, and FIG. 4 is a method for waterproofing and reinforcing a sewn product using a waterproof fabric having a three-layer structure according to the present invention. FIG. 5 is a side sectional view showing another example of a sealing tape used in the present invention. 1 ... Waterproof breathable membrane, 2 ... Outer surface, 3 ... Lining, 4 ... 3
Sewn products using a layered structure waterproof fabric, 5 ... Seams, 6 ...
… Seam hole, 7,11a, 11b, 11c, 11d, 11e, 11f …… Sealing tape, 10 …… Convex part, 12 …… High melting point resin film, 13 ……
Low melting point resin film, 14 …… Release paper, 15 …… Cloth

Claims (1)

[Claims] 1. A resin film having a low melting point as a back layer when sealing a seam portion of a sewn product using a waterproof fabric having a three-layer structure in which a waterproof moisture-permeable membrane is formed in the middle layer and outer and outer layers are knitted fabrics. The low melting point resin film side of the multi-layered sealing tape composed of is brought into contact with the lining side of the sewn product and subjected to heat treatment, and the melted material of the low melting point resin film passes through the lining to reach the waterproof and moisture permeable membrane as the middle layer. In this way, the sealing tape is adhered to the sewn product so that the sewn product can be waterproofed and reinforced using the three-layer waterproof fabric.