JPH01192866A - Weldable, air-permeative and water-proof cloth, its production and device therefor - Google Patents

Abstract

PURPOSE:To obtain weldable, air-permeating cloth continuously in high efficiency by impregnating a cloth with a composition containing a water repellent agent and a spreading agent, then coating the resultant cloth with a synthetic resin fusible and high dielectric loss on the parts to be sewed. CONSTITUTION:When a water repellent layer and weldable layer are formed on an airpermeating cloth, a composition containing a spreading agent for increasing the adhesion to each other is used and suitably treated to give an air-permeating, water-proof cloth 1. The cloth is preheated with cylinders 5, 5' and coated with a synthetic resin heat-fusible and high in dielectric loss on the parts to be bonded with a coater 6. Then, the resulting cloth is passed through drier A, heat treatment B and cooling cylinders 10, 10' to produce the air-permeating, fusible duck continuously in high efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a breathable waterproof fabric that can be welded together, and a method and apparatus for manufacturing the same.

(Prior technology) Cotton canvas has traditionally been used for tent fabrics and trunk seats, and later synthetic fibers have been used, but waterproof fabrics coated with vinyl chloride resin are not breathable. Due to its nature, it has disadvantages such as stuffiness and dew condensation, so there is still a strong need for breathable waterproof canvas.

The synthetic fiber canvas coated with the vinyl chloride resin is relatively heavy, and as the size of the sheet increases, it takes a lot of effort to hang or remove the sheet, but on the other hand, it has the advantage of being able to be sewn with a hot welder. However, when breathable fabric such as cotton canvas is impregnated with metal soap, paraffin, etc., hot welder sewing is not possible. Furthermore, in the case of a material that has been previously subjected to water-repellent treatment, there is a drawback that the adhesive strength of the seamed portion is reduced to, for example, about 3 kg/3 cm. Furthermore, in the case of welder sewing, methods such as sandwiching a synthetic resin adhesive tape between the objects to be welded, or applying a resin with a high dielectric loss rate to the seam part to enable high frequency welding are used. However, there were drawbacks such as complicated sewing and adhesion work and poor mutual adhesion strength.

(Problem to be solved by the invention) For this reason, for example, JP-A-55-51868, JP-A-5
No. 5-128077 etc. have been proposed.

In the above-mentioned Japanese Patent Application Laid-Open No. 55-51868, after a synthetic resin layer capable of high frequency bonding is formed on the part of a breathable fabric to be sewn, impregnation is performed using an aqueous treatment liquid containing a breathable water repellent. Moreover, a breathable waterproof fabric in which the synthetic resin layer is not substantially coated with a water repellent agent is disclosed. Furthermore, Japanese Patent Application Laid-Open No. 55-51868 discloses that after applying, pasting or impregnating a synthetic resin that can be sewn with thermal adhesive on the parts of a breathable fabric where adhesive sewing is to be performed, the entire surface of the fabric is made to maintain air permeability. A breathable waterproof fabric that is water-repellent-treated and can be sewn with heat adhesive is disclosed.

In the above-mentioned proposals, in order to improve the drawback that the seam strength of the seam portion is significantly reduced when sewing conventional breathable waterproof fabrics with heat bonding, synthetic resin that can be sewn with heat bonding is used in advance at the location where the fabric is to be sewn. Form a layer, for example by applying a pre-formed tape or slate, paste, paratha, i9? f1. A film is formed on the fabric using the method described in 'J.

In the above-mentioned proposal, a synthetic resin layer that can be heat-sew bonded is formed in advance at the location where the breathable fabric is to be bonded, and the synthetic resin layer is firmly adhered to the fabric in order to secure it. As long as the synthetic resin layer is not substantially coated by water treatment, mutual adhesion during high frequency sewing can be improved. However, even if the fabric is made of natural fibers such as cotton, or synthetic fibers such as polyester or vinylon, the breathable fabric must be treated with water-repellent treatment in advance in order to improve processing efficiency. Next, it is appropriate that the step of forming a synthetic resin layer at the points to be joined by heat sewing is carried out continuously, and furthermore, in the above proposal, the entire fabric with tape or the like pasted in advance to the parts to be joined by heat sewing is suitable. After the impregnation treatment, it is necessary to squeeze the joints through a mangle, and also to wash the water repellent agent coated on the surface of the synthetic resin layer made of the pasted tape etc. It is troublesome to install, remove, and then require a drying process, and it is difficult to simplify the process and improve operational efficiency.

The present inventors have arrived at the present invention as a result of intensive studies to solve the above-mentioned problems.

In the present invention, a breathable fabric is pre-impregnated with a water repellent compound containing a spreading agent, and a synthetic resin layer that can be sewn with high frequency adhesive is provided on the part of the fabric to be sewn. The present invention provides a breathable waterproof fabric that can be sewn by welder, and a method and apparatus for producing the waterproof fabric. Still another object of the present invention is to provide a fabric that has air permeability and water repellency, maintains the necessary adhesive strength at the welder-sewn portion, and is industrially advantageous and can be manufactured with high working efficiency.

(Means for solving the problem) In the above-mentioned proposals, etc., the drawback that conventional waterproof fabric coated or impregnated with a breathable water repellent agent in advance and made of high frequency 1 has low adhesive strength and poor mutual bonding is improved. However, in the present invention, a heat-sewable synthetic resin layer is first formed at the locations to be joined by high-frequency sewing, and then water-repellent treatment is applied to the entire surface. From the point of view of simplifying process control, firstly, the entire surface of the fabric is impregnated with the desired water repellent compound, and then a synthetic resin with high heat meltability and high dielectric loss rate that can be welded to the area to be sewn with high frequency is applied. It is characterized by forming a layer.

The fabric used in the present invention is a natural fiber, a synthetic fiber, or a blend thereof, and a knitted fabric can also be used if it is possible to form a synthetic resin layer that can be treated with a water repellent agent and bonded by welder sewing.

The water repellent compound used in the present invention includes paraffin wax, rosin, filler, pigment, and vinyl chloride resin ethylene acetate as a spreading agent to improve the adhesiveness and heat-sealing strength at the time of adhesion. - Le resin,
Polyurethane resin, acrylic ester resin, etc. are used. In this case, by using a spreading agent that has an affinity with the resin of the synthetic resin layer that can be bonded by welder sewing, the adhesive strength between the layers can be further improved. The blending amount of the spreading agent is 3 to 3% relative to the water repellent formulation.
10% by weight, preferably 5-8% by weight.

Next, welder bonding with the present invention! Heat-meltable and high-frequency weldable synthetic resins to be formed in the JI suture area include synthetic resins with a high dielectric loss rate, such as vinyl chloride resin, ethylene vinyl acetate copolymer, polyamide resin, urethane resin, and acrylic resin. Resin or the like can be used, and any material that can be bonded by Welder M may be used.

When applying a layer of the synthetic resin to the part of the fabric to be sewn,
For example, a method can be used in which a synthetic resin paste prepared separately in advance is coated using a resin coating machine or the like. In addition, in the present invention, in addition to applying a pre-formed tape for treatment with a water repellent formulation containing a spreading agent,
It can also be configured using straight, powder, or solution.

Fig. 1 is a cross-sectional explanatory diagram showing a configuration in which adhesive synthetic resin layers made of welder ffl are formed on the edge positions of both sides of a waterproof fabric according to the present invention, and Fig. 2 is a cross-sectional view showing a structure in which a synthetic resin layer is formed on one side of the waterproof fabric. It is an explanatory diagram.

In FIGS. 1 and 2, the waterproof fabric 1 according to the present invention is impregnated with a water repellent compound, and
A synthetic resin layer 2 made of a synthetic resin having high thermal meltability and high dielectric loss rate is formed on a portion 3 of the canvas 1 to be sewn.

In the case of FIG. 1, the suture planned portions 3 are formed at the edge positions of both the front and back surfaces, whereas in FIG. 2, the suture planned portions 3 are provided only at the edge positions of one side. For example, for the side walls of tents, etc., the sewn and adhesive portions 3 as shown in Fig. 1 are formed, and for the ceiling portion, the sewn and adhered portions 3 are formed at the edge positions on both sides as shown in Fig. 2. 3
It has a structure in which a synthetic resin layer 2 is provided on.

In this way, the waterproof fabric used in welder sewing must have at least the two types of areas to be sewn, and the sewing and bonding work is performed by a combination of these. Forming the synthetic resin layer on the planned portion 3 is a complicated process from the viewpoint of work efficiency.

FIG. 3 is a schematic explanatory diagram of an apparatus for forming a synthetic resin layer on a welder-sewn and bonded portion according to the present invention. In the figure, A is a dryer, B is a heat treatment machine, and the image processing machines are installed in parallel and separated from each other, and each processor is equipped with a large number of hot air blowing nozzles 8 inside to control the internal temperature. The structure is designed to promote circulation and uniformity.

The waterproof fabric is pre-impregnated with a water repellent compound (not shown), and the impregnated waterproof fabric 1 is transported on a cart 4 in a folded state. In the present invention, in order to obtain a state of so-called easy wettability that is effective when applying the next synthetic resin layer 2 to the fabric 1, the repellent coating is applied to the fabric 1 using heating cylinders 5 and 5'. The fabric 1 is preheated at a temperature of 60 to 80° C., which is slightly higher than the melting point of paraffin, rosin, etc. in the liquid formulation.

Next, a coating is applied to the part 3 of the fabric 1 to be sewn by a resin coating machine 6 equipped with a resin storage tank 7 containing a synthetic resin paste with a high dielectric loss rate that can be sewn by welder.

Next, in the drying process, the fabric 1 is heated at 100°C to 12°C while being rolled through the dryer A with guide rollers 9,9''.
Dry at 0°C for 60 seconds. Next, in the heat treatment step, heat treatment is performed at 180° C. to 200° C. for 60 seconds while being reversely lowered into heat treatment machine B, which is installed adjacently and isolated.

The fabric 1 that has undergone the above drying and heat treatment is placed in a cooling cylinder 10.
．． 10'', shaken off through guide rollers 11, and loaded into a truck 12 in a folded state.

As described above, in the waterproof fabric according to the present invention, the fabric material is first subjected to the necessary processing treatment with a water repellent compound, and the compound is coated with a synthetic resin layer that can be sewn by a welder. The composition contains a spreading agent to reinforce and improve mutual adhesion. If further adhesive strength is required, it can be treated with a water repellent formulation containing a synthetic resin that has mutual affinity or compatibility with the synthetic resin layer. In addition, in the present invention, when applying the synthetic resin layer 2 to the portion 3 to be sewn, the waterproof fabric 1 subjected to the water-repellent treatment is wetted in order to improve adhesion in advance with heating cylinders 5, 5''. After preheating, the area to be sewn 3 is coated with a synthetic resin paste having high heat meltability and high dielectric loss rate using a resin coating machine 6. Next, drying at different processing temperatures, etc.
It has a general configuration in which each step of heat treatment is separated, and even if the processing conditions differ depending on the material, use, etc., the conditions can be set appropriately and processing can be carried out continuously and efficiently.

Therefore, in the present invention, from an equipment perspective, it is also possible to adopt a configuration in which general-purpose equipment conventionally used for resin impregnation, coating, pasting, etc. in canvas processing can be shared or used in combination.

(Function) As described above, the breathable waterproof fabric according to the present invention does not have the stuffiness or dew condensation phenomenon that conventionally impermeable fabrics have (in addition, when forming a synthetic resin layer in the area to be bonded by high-frequency sewing, it does not When applying water-repellent treatment in advance, a water-repellent compound containing a spreading agent is used to overcome the problem of poor adhesion.Furthermore, a synthetic resin that has affinity or compatibility with the synthetic resin layer is used. The mutual adhesion between the fabric and the synthetic resin layer can be improved by this method.Furthermore, for the waterproof fabric of the present invention, the water repellent level obtained by the pre-applied water repellent treatment can be evaluated as follows. Case 6: The resin layer is deposited, dried and heat treated.

Furthermore, in the present invention, when applying a synthetic resin layer that can be bonded by high frequency sewing to the water-repellent fabric,
It is constructed in such a way that it is heated in advance at a temperature slightly higher than the melting point of the paraffin or rosin in the water repellent to improve the mutual adhesion between the fabric and the synthetic resin layer. Further, when forming the synthetic resin layer, for example, a resin paste may be used to enhance mutual adhesion. As described above, the present invention can prevent the deterioration of mutual adhesion between the waterproof fabric and the synthetic resin layer and solve the problems caused by the synergistic effects described above.

Since the waterproof fabric according to the present invention has the above-described structure, the spreading agent in the water repellent can be selected as appropriate depending on the material used or the purpose, and the spreading agent can be applied to the edge position of the impregnated fabric. Layering of synthetic resin layers that can be bonded by high-frequency sewing,
Next, the drying and heat treatment steps can be carried out continuously while the fabric is being transported.

For this reason, for example, as shown in FIGS. 1 and 2, the synthetic resin layer may be formed only on one edge of the fabric, or on both edges. Even if there is a synthetic resin layer, it is possible to easily apply a synthetic resin layer to the desired edge position by using the structure, manufacturing method, and apparatus of the waterproof fabric according to the present invention, and further drying.
The heat treatment can be carried out in a continuous step.

(Example) Hereinafter, the present invention will be explained in more detail with reference to Examples.

Example 1 Using cotton canvas (No. 9), it was scoured and dyed in an olive green color with anthraquinone-based and azo-based vat dyes, and after drying in a cylinder, a water repellent agent containing a spreading agent having the following composition was added. After immersing the sample in a liquid (concentration 52%) and squeezing it with a mangle, a substitution reaction was carried out through a metal salt solution, followed by washing and drying.

The numbers for the formulations below do not indicate weight %.

Water repellent formulation Wax 21 0 Jin 4 Filler 16 Spreading agent 3 (Vinyl chloride resin emulsion, manufactured by Nippon Zeon.

Zeon G 576, i1 degree 55%) Pigment　　　　　　　　】45 Thickeners and others 4 The water repellency of the fabric subjected to the above treatment is J　I　s, -t.

1004-1972 The result of measurement by method A (spray method) was 90 points.

Next, the above fabric was passed through a heating cylinder to a temperature of 60 to 8
After preheating at 0°C, vinyl chloride resin (Kanevinyl PSM-30, manufactured by Kanebuchi Chemical Co., Ltd.) was heated to a viscosity of 4, OOO~4.
Coating was performed using a resin coater using a resin coated resin coated at 500 cps. Resin solid content adhesion amount is 8g/3
■It was X1m.

Next, after drying in a dryer at 100°C to 120°C for 60 seconds, it was further introduced into a heat treatment machine and heat treated at 200°C for 60 seconds. Then, after passing through a cooling cylinder, it was shaken off and loaded into a truck in a folded state.

Example 2 Cotton/polyester blend canvas (warp count 8/2 strands, width 6 count/1 strand, number of strands per inch).

41 x 37 (length and width), was scoured and dyed olive green with anthracite, non-based and azo vat dyes, and after cylinder drying, a water repellent formulation (concentration) containing a spreading agent consisting of the following composition was applied. 51%) was subjected to water repellent treatment in the same manner as in Example 1.

Water repellent formulation (wt%) Wax 18 0 Jin 4 Filler 16 Spreading agent 5 (Vinyl chloride resin emulsion, manufactured by Nissin Chemical.

Vinybran #386.45% and ethylene Hl Neil resin, manufactured by Dainippon Ink, Ehadisoku UP-1153%) Pigment 3 Thickener, etc. 4 The water repellency of the above fabric was determined as in Example 1, and JTS-L 1
004-1972 The result of measurement by method A (spray method) was 80 points.

The fabric subjected to the above treatment was preheated at 60 to 80°C by passing it through a heating cylinder in the same manner as in Example 1.
Zeon 135J'), viscosity 4000-5000
Coating was carried out using a resin coating machine. Adhesion weight with resin solid content is 9 g/3cmX
It was 1 m.

Next, after drying in a dryer at 100-110°C for 60 seconds, it is further introduced into a heat treatment machine and heated at 175°C-185"C1.
Heat treatment was performed for 60 seconds. Then, it was passed through a cooling cylinder, shaken off, and loaded into a truck in a folded state.

Example 3 Cotton canvas (No. 10) was scoured and dyed in the same manner as in Example 1, and after drying, a water repellent formulation containing the following spreading agent (concentration 5
4%) to make it water repellent.

Water repellent formulation (wt%) Wax 21 0 Jin 4 Filler 16 Spreading agent 5 (Ethylene vinyl acetate resin, manufactured by Hoechst Synthesis.

Movinyl 181E, 55%) Pigment 1.5 Thickener etc. 4 The water repellency of the above treated fabric is JIS-L1004-1
The result of measurement using the 972A method (spray method) was 90 points.

The fabric subjected to the above treatment was preheated at 60 to 80°C by passing it through a heating cylinder in the same manner as in Example I, and then its viscosity was measured using vinyl chloride vinyl acetate copolymer resin (Zeon 135J, manufactured by Zeon Corporation). 4000~500
The coating prepared at 0 cps was coated using a resin coating machine. The amount of resin solid content deposited was 7 g/3×1 m.

Next, after drying in a dryer at 100-110°C for 60 seconds, it was further introduced into a heat treatment machine and heated at 175-185°C for 60 seconds.
Second heat treatment was performed. Then, after tightening the cooling cylinder, they were shaken off and loaded into a truck in a folded state.

As a comparative example, a waterproof fabric (application amount: 31
5g/+t? ) was created.

(Effects of the Invention) Since the present invention is configured as described above, it produces effects as described below.

The waterproof fabric according to the present invention has a structure in which the fabric is first subjected to water-repellent finishing, and then a synthetic resin layer that can be sewn at high frequency is formed on the area to be sewn, which greatly simplifies and streamlines the work process. can be achieved.

Furthermore, in the present invention, the required good numerical value for water repellency, for example, can be obtained by treatment with a water repellent formulation.

Furthermore, in the present invention, a water repellent compound containing an appropriate spreading agent is used, and before the synthetic resin layer is formed, the fabric is preheated at a temperature slightly higher than the melting point of the paraffin etc. impregnated with the fabric. This improves mutual adhesion in a wet state. Furthermore, mutual adhesive strength can be increased by using a water repellent compound that is compatible with the synthetic resin layer. In the present invention, due to these synergistic effects, even though the necessary water-repellent treatment has been applied to the fabric, it is possible to prevent the mutual adhesive strength from decreasing at the seam portion at the edge of the waterproof fabric after the treatment. can.

Then, the parts to be sewn of each of the waterproof fabrics obtained in Examples 1 to 3 of the present invention and the comparative example were overlapped, and the output cuff KW, the anode current was 1.2 amperes, and the oscillation time was 4 seconds.

Comparison of the peel strength of the seam and the air permeability of the waterproof fabric other than the seam when welding with Welgoo 1JL using a high frequency oscillator under the following welding conditions: cooling time 2 seconds, mold size 30mm x 600wm, and pressure 4kg/- The results are shown in Table 1.

The peel strength was measured using 3 cm wide samples of each of the waterproof fabrics of Examples 1 to 3 and Comparative Example in accordance with JIS-6328 method. In addition, the breathability is JIS-L-10
A Frazier type tester was used with 96A.

As shown in Table 1 below, the waterproof fabric according to the present invention not only has the necessary breathability, but also has a peel strength of 5 to 6 kg/3 at the seam, which is required for products such as tents.
All conditions of cn+ or higher are satisfied.

In addition, since the breathable waterproof fabric according to the present invention has the above-described structure, it is first treated with a water repellent compound, followed by layering of a synthetic resin layer, followed by drying and heat treatment to improve work efficiency. Methods and devices that can be implemented and 2l- = 20- can be adopted. Therefore, whether the seam part for welder a waterproof fabric adhesion is formed on only one side or both sides of the fabric, it can be processed continuously in the same way, and the breathable waterproof canvas can be welded. can be produced industrially advantageously.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional explanatory view showing a configuration in which a synthetic resin layer that can be welded and bonded is formed on the edges of both sides of a waterproof fabric according to the present invention, and Fig. 2 is a cross-sectional view showing a structure in which a synthetic resin layer is similarly formed on one side of the waterproof fabric. 3 are schematic explanatory diagrams of an apparatus for forming a synthetic resin layer on a seam portion of a waterproof fabric according to the present invention. ■...Waterproof fabric, 2...Synthetic resin layer, 3...Sewing area, 4...Dolly, 5,5J...Heating cylinder, 6...Resin coating machine, 7...・Resin storage tank, 8・-・
Hot air blowing nozzle, 9.9J...Guide roller, 1
0゜10j...Cooling cylinder, 11...Guide roller, 12...Dolly

Claims (1)

[Scope of Claims] 1. A breathable fabric is pre-impregnated with a water repellent compound containing a spreading agent, and adhesive stitching using high frequency is possible at the part of the fabric to be sewn. A breathable waterproof fabric that can be welded and is characterized by having a structure in which a synthetic resin layer is formed. 2. A step of pre-impregnating a breathable fabric with a water repellent compound containing a spreading agent, and then layering a synthetic resin that can be adhesively sewn by high frequency on the part of the fabric to be sewn. 2. The method for producing a welder-sewable breathable waterproof fabric according to claim 1, comprising the steps of: and drying and heat treatment. 3. Equipped with a resin coating machine that coats a pre-impregnated waterproof fabric with a synthetic resin that can be adhesively sewn using high frequency on the part to be sewn, and a dryer and a heat treatment machine to form a synthetic resin layer on the part to be sewn. 3. The apparatus for manufacturing a breathable waterproof fabric capable of welder sewing according to claim 1 or 2, wherein said fabric is continuously processed.