JPS6317954B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a breathable waterproof fabric adhesively sewn by heating.

Conventionally, waterproof fabrics made of cotton canvas treated with paraffin, metal soap, etc. have been used for the canopies of truck seats, tent fabrics, and various coverings.
After that, synthetic fibers, which have excellent strength and durability, came to be used.

However, in the case of synthetic fibers, the above-mentioned paraffin,
Even if an apparent water resistance is obtained by treatment with metal soap, etc., the adhesion of paraffin, metal soap, etc. to the fibers is not sufficient, so water leakage will gradually occur, which is not appropriate, and in the end, treatment with vinyl chloride resin, etc. Impermeable waterproofing has been practiced by coating mainly on the surface to form a continuous film.

However, for this type of impermeable waterproof fabric,
When used as a transportation canopy, storage canopy, tent fabric, etc., the interior of the canopy becomes extremely stuffy because it is impermeable to moisture and air, and condensation may occur in environments with rapid temperature changes. Therefore, cotton waterproof fabrics that maintain breathability have remained very popular.

Further, as mentioned above, high frequency sewing is possible with synthetic fiber canvas coated with vinyl chloride resin, but heating adhesive sewing is not possible with impregnated with paraffin, metal soap, etc. In addition, when a waterproof fabric coated or impregnated with an air-permeable water-repellent agent as described above is sewn with heat adhesive using a synthetic resin adhesive tape, the adhesive strength between the formed synthetic resin layer and the water-repellent layer is As a result, the mutual binding strength of waterproof fabrics sewn with heat adhesive is low. In view of these circumstances, there has been a strong demand for a method for manufacturing waterproof fabrics that can be sewn with strong heat adhesive and have sufficient air permeability.

The present invention was made in view of such circumstances, and
The object of the present invention is to provide a method for producing a waterproof fabric that is adhesively sewn by heating while maintaining sufficient air permeability.

The method for producing a breathable waterproof fabric adhesively sewn by heating according to the present invention includes forming a heat-bondable synthetic resin layer only on the portion of the breathable fabric to be sewn by coating, adhering, or impregnating it; Thereafter, by coating or impregnating the entire surface of the fabric with an air-permeable water-repellent agent, a layer of air-permeable water-repellent agent is formed on the portions of the fabric where the synthetic resin layer is not formed. This method is characterized in that a breathable waterproof fabric is prepared, and a heat-compression bonding process including operations of superimposing the fabric on two synthetic resin layers of the fabric to be sewn together, heating and melting the fabric, and press-bonding the fabric is performed.

In the waterproof fabric obtained by the method of the present invention, the synthetic resin layer formed in the stitched portion is directly and firmly bonded to the fabric itself, and
There is substantially no water repellent layer on this synthetic resin layer. Therefore, by heat stitching, the two waterproof fabrics are firmly bonded together via the heat-bonded synthetic resin layer.

Hereinafter, the present invention will be described based on examples with reference to the drawings.

In FIG. 1, numeral 1 is a breathable fabric that has normally been subjected to scouring and/or dyeing. A heat-bondable synthetic resin layer 2 is formed in advance on a portion of one (or both) sides of the fabric 1 to be sewn by applying, adhering, or impregnating the fabric with a synthetic resin before the fabric is water-repellent. If the synthetic resin layer 2 is formed after water-repellent finishing, the water-repellent layer interposed between the fabric and the synthetic resin layer will provide a release effect and improve the adhesion between the fabric and the synthetic resin. As a result, the sewing strength during heat sewing is significantly reduced. After the synthetic resin layer 2 is formed on the portion to be sewn by applying, adhering or impregnating a synthetic resin, the entire fabric is impregnated with or applied with a water repellent. Then, virtually no water repellent agent adheres to the synthetic resin layer, and the water repellent layer is essentially formed directly only on the portions of the fabric where the synthetic resin layer is not formed. It is. Even if the water repellent agent adheres to the synthetic resin layer, it is easily removed by friction or washing between steps.

In order to perform heat sewing in the method of the present invention, the second
As shown in the figure, the synthetic resin layers 2, 2 are directly superimposed, heat-pressed and sewn together.

In the method of the present invention, as shown in FIG. 3, the synthetic resin layer 2 has a synthetic resin adhesive layer 3, for example, an epoxy resin adhesive layer formed between its lower surface and the fabric 1. In this case, the adhesiveness between the synthetic resin layer 2 and the fabric 1 can be improved, but the heat adhesiveness of the synthetic resin layer 2 is not reduced.

Breathable fabric (knitted fabric) used in the method of the present invention
There are fabrics made of natural fibers such as cotton linen, such as canvas, blended fabrics made of natural fibers and synthetic fibers such as vinylon, nylon, or polyester fibers, and fabrics made of synthetic fibers such as vinylon. may be previously processed with alkyd resin, petroleum resin, etc. as long as it maintains sufficient air permeability.

In the method of the present invention, nylon such as nylon 11, nylon 12, vinyl chloride resin, ethylene vinyl acetate copolymer, urethane resin, etc. are used as heat bondable synthetic resins. In general, most known thermoplastic resins can be used as long as they are thermoplastic and have adhesive properties when melted. Furthermore, it is not prohibited to mix other substances within a range that does not inhibit adhesive sewing. The synthetic resin layer can be formed by pasting a molded tape, or by applying or impregnating synthetic resin onto the top surface of the fabric using straight, paste, powder, solution, or other methods to form a film of an appropriate thickness. It may be something you do.

As the breathable water repellent used in the method of the present invention, conventionally used ones such as paraffin,
Metal soaps, silicones, zirconium salts, etc. can be used. For example, in the case of cotton canvas, the above-mentioned water repellent may be applied to such an extent that when it becomes wet with rainwater, the fibers swell and close the fabric structure, such as the weave.

There are no particular limitations on the structure, basis weight, thickness, etc. of the fabric used in the method of the present invention, and these can be selected taking into consideration the strength, durability, waterproofness, etc. required of the product. The fabric may be scoured, dyed, or pigmented, or it may be left as a greige fabric.

In the method of the present invention, the synthetic resin layers of the two parts to be sewn of the breathable waterproof fabric prepared as described above are overlapped, heated and melted, and crimped. Preferably, hot air is blown onto the synthetic resin layers to melt them while overlapping and press-bonding them. At this time, if you use a heat welding device with a flat tip that can blow hot air from a heater directly onto the desired part of the fabric, such as a Leister welder, you can completely melt the adhesive surface of the synthetic resin. This allows adhesive sewing to be performed without causing burnout or the like to the base fabric. Further, at this time, the adhesion effect can be further enhanced by pressing down the bonded area using a roller or the like from the upper surface of the fabric.

In the method of the present invention, the base fabric of the breathable waterproof fabric and the synthetic resin layer are directly and firmly bonded to each other, and substantially no water repellent agent adheres to the synthetic resin layer. Therefore, the waterproof fabric adhesively sewn by the method of the present invention generally has a weight of 7 kg/3 cm or more, for example, 8 to 12 kg/3 cm or more.
Shows good peel strength of Kg/3cm. However, when a synthetic resin layer is formed after a water-repellent treatment is applied to a base fabric using the conventional method, a water-repellent layer exists between the base fabric and the synthetic resin layer, and such waterproof fabric When sewn with adhesive, the resulting waterproof fabric generally exhibits a low peel strength of 4 kg/3 cm or less, for example 2 to 4 kg/3 cm. Therefore, the present invention is an effective method for obtaining a breathable waterproof fabric having superior peel strength compared to conventional methods.

A preferred embodiment will be described below.

As shown in Figure 1, vinyl chloride resin is applied to both ends of the original fabric, which is made by tying cotton canvas (No. 10) and going through the processes of scouring (caustic soda scouring), dyeing (slenium dyeing), and drying (cylinder drying). A tape was attached and heated and melted and impregnated to release the tape state and form the synthetic resin layer 2. Next, this original fabric was immersed in a metal alumina soap solution to make the entire surface water-repellent.

Hot air was blown onto the synthetic resin layer of this material using a Leister hot air welding machine, and adhesive sewing was performed by pressing and bonding as shown in FIG. The heater was 750W, and a heat-resistant silicone pressure roller was used to pressurize the sewing surface during welding, and a 40mm-wide flat nozzle was used to blow hot air onto the surface of the synthetic resin layer. The average peel strength of the sewn portion of the obtained sewn fabric was 9.3 kg/3 cm, and as shown in FIG. The same strength was 9.5Kg/3cm for the sample. As a comparative example, an output of 2 kW and a frequency of 40.68 MHz was applied to a waterproof fabric made by applying vinyl chloride resin to the entire surface of a polyester fiber plain weave to make it impermeable and waterproof.
High-frequency sewing was performed by applying electricity for 3 seconds using a high-frequency oscillator. The average peel strength of the obtained seams is
The peel strength was 9.3 kg/3 cm, and therefore, the peel strength in the case of the method of the present invention was equivalent to or higher than that of high-frequency sewing.

Furthermore, for comparison, the same plain woven fabric as the polyester fiber plain woven fabric was subjected to water-repellent treatment using metal alumina soap as described above, and vinyl chloride resin tape was attached to both ends thereof in the same manner as described above.

This comparative waterproof fabric was subjected to the same hot air heating and pressure sewing operations as described above. The average peel strength of the obtained sewn portion was 3.1 kg/3 cm, which was unsatisfactory.

As described above, in the method of the present invention, since there is no water repellent layer interposed between the synthetic resin layer to be subjected to heat bonding treatment and the fabric, it is firmly adhered to the fabric, and therefore the heat bonding treatment Stitched fabrics can exhibit excellent peel strength. Furthermore, the water repellent applied or impregnated on the fabric hardly adheres to the synthetic resin layer, and even if it does, it is removed during the process, which reduces the heat adhesion of the synthetic resin layer. There is almost nothing to do.

The heat bonding operation according to the method of the present invention is simple;
Further, there is no water leakage from the perforations, and therefore no special measures are required to prevent water leakage.

Furthermore, the waterproof fabric heat-sewn by the method of the present invention maintains good air permeability.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the waterproof fabric used in the method of the present invention, Fig. 2 is a sectional view showing the overlapping state of the waterproof fabric during thermal adhesive sewing, and Fig. 3 is the waterproof fabric used in the present invention. FIG. 3 is a perspective view of another embodiment of the invention. 1... Breathable fabric, 2... Synthetic resin layer, 3...
adhesive layer.

Claims (1)

[Claims] 1. Only on the part of the breathable fabric to be sewn,
A heat-bondable synthetic resin layer is formed by coating, pasting, or impregnation, and then a breathable water repellent is applied or impregnated on the entire surface of the fabric to form a synthetic resin layer of the fabric. A breathable waterproof fabric is prepared by forming a breathable water repellent layer on the unformed part, and then heated, melted, superimposed, and crimped onto the synthetic resin layer of the two parts of the fabric to be sewn. A method for producing a breathable waterproof fabric adhesively sewn by heating, the method comprising performing a heat-pressing process including an operation. 2. The manufacturing method according to claim 1, wherein the breathable fabric is cotton canvas. 3. The manufacturing method according to claim 1, wherein the synthetic resin is a polyvinyl chloride resin. 4. The method according to claim 1, wherein the heat bonding operation is an operation of blowing hot air onto the synthetic resin layers of the two parts of the fabric to be sewn to melt them while overlapping and pressing them together.