JPH07216727A - Waterproof fabric - Google Patents

Abstract

PURPOSE:To prevent water from leaking out of a sewn part of a waterproof fabric. CONSTITUTION:This waterproof fabric is obtained by folding back a sewn end (1A) of either (A) of fabrics in the waterproof fabric prepared by sewing two fabrics (A) and (B) together, inserting a sewn end (1B) of the other fabric (B) into the folded back part 2, sewing the superimposed part in a three-ply state together, further folding back the fabric (A) in the form of Z in the direction opposite the folding back direction of the sewn end and sewing the superimposed part together in a four-ply state. In the process, the sewing is preferably carried out by using a water-repellent sewing thread and/or a sewing thread containing a hot-melt component.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof cloth which can prevent water leakage from a stitched portion and is excellent in waterproofness.

[0002]

2. Description of the Related Art In recent years, excellent waterproof fabrics have been developed and have come to be widely used for waterproof products such as raincoats, raincoats and tents. However, even if the product uses an excellent waterproof fabric, if the water leaks from the stitched portion, the waterproof property of the product will be significantly reduced.

Conventionally, the following structure has been generally used as a stitching structure for cloth.

FIG. 3 shows a stitching structure generally referred to as two-sided stitching, in which 11 sewn portions of two cloths A and B are folded back and sewn at seams 7 at the folded back portions 6A and 6B. However, since a large void 8 is formed in the seam portion and a large amount of water leaks in the route indicated by arrow A, it is completely unsuitable for a waterproof fabric.

FIG. 4 shows a stitching structure generally referred to as one-sided stitching, in which the stitched end portions of two fabrics A and B are overlapped and stitched at a seam 9, and then the fabric A is folded back. In the folded-back portion 10, three pieces of fabric B are sewn together with the fabric B at seams 11 and are widely used as a sewn structure for waterproof products.

However, in this stitching structure, although three stitches are sewn, the contribution of the folded portion 10 to preventing water leakage is small, and water leaking through the stitch holes of the seam 11 (hereinafter,
There is only one piece of fabric to prevent seam hole leakage)
There are many leaks in the seam holes indicated by the arrow B. Further, since the gap 12 between the fabrics A and B is straight, the amount of water leaked from the gap between the fabrics in the direction indicated by the arrow C (hereinafter referred to as "water leakage between stitches") increases. Therefore, the waterproofness of this suture structure is not sufficient.

FIG. 5 shows a stitching structure generally referred to as "rolling stitch", in which the stitching ends of two cloths A and B are folded back so that both folding portions 13A and 13B are engaged with each other.
The stitches 14 and 15 are sewn in a state of overlapping sheets.

In this stitching structure, since the gap between the fabrics is bent in a Z shape, there is little water leakage between the fabrics, but there is only one fabric that prevents the water leakage through the stitch holes (when stitching four fabrics together, However, the folded portions 13A and 13B do not contribute much to the prevention of water leakage), and it is impossible to prevent the water leakage through the seam holes indicated by arrows D and E. Therefore, the waterproofness of this suture structure is not sufficient.

Therefore, in order to prevent water leakage from the sewn portion, a method is widely used in which a waterproof tape is adhered to the back side of the sewn portion to cover it. This method is certainly excellent in preventing water leakage at the stitched portion, but since the tape is further adhesively fixed to the stitched portion that is hard because the fabrics are sewn on top of each other, The sewn portion is further hardened, and the quality of the product is greatly deteriorated.

Further, the work of adhering the waterproof tape is extremely complicated, and there is a drawback that the work efficiency is greatly reduced.
Further, in recent years, many waterproof cloths have been subjected to a water-repellent finish, and there is a problem that it is extremely difficult to attach a waterproof tape to such a water-repellent cloth.

In order to eliminate such a drawback, for example, Japanese Patent Publication No. Sho 63-23293 proposes a method of stitching using a water-repellent sewing thread provided with a water-repellent coating layer made of a fluororesin. In addition, JP-A-56-119895
Japanese Patent Laid-Open Publication No. 2003-242242 proposes a method in which a low-temperature heat-melting fiber is used together with a sewing thread, which is sewn and then heat-treated.

According to these methods, problems such as hardening of the sutured portion and deterioration of workability are improved. However, although these methods can prevent water leakage from the seam holes, they cannot completely prevent water leakage from the space between the fabrics, and the water leakage prevention effect of the entire stitched portion is reduced. .

[0013]

SUMMARY OF THE INVENTION An object of the present invention is to provide a new waterproof cloth having an excellent effect of preventing water leakage from the stitched portion.

[0014]

According to the present invention, (1)
In a waterproof fabric obtained by stitching two fabrics A and B, one fabric A is folded at the stitched end, and the other fabric B is stitched at the folded end so that three overlapping portions are overlapped. And further, the fabric A is folded back in a Z shape in a direction opposite to the folding direction of the stitched end portion, and the overlapped portion is sewn in a state of being overlapped with four sheets, a waterproof fabric, (2) 4
The waterproof fabric according to (1) above, wherein the seam in the stacked state is located on the opposite side of the folded end of the folded portion from the seam in the stacked state of three sheets, and (3) the water repellent suture. There is provided a waterproof fabric according to (1) or (2) above, which is sewn with a suture containing a thread and / or a heat-meltable component.

The present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view for explaining a stitching process of an example of the waterproof cloth of the present invention, and FIG. 2 is a perspective view showing an example of the waterproof cloth of the present invention. Two cloths A and B are shown. The sewn end 1A of one of the fabrics A is folded back, and the sewn end 1B of the other fabric B is inserted into the folded portion 2. The three overlapped portions are sewn together with the seam 3 in a stacked state.

At this time, the width of the folded portion 2 is not particularly limited, but is preferably 5 to 15 mm. Further, the position of the stitch 3 may be anywhere within the width of the folded portion 2 as long as it is within a range where three sheets are sewn together, but the folded ends 4 to 1 to 1
Positions 0 mm apart are preferred.

Next, the cloth A is folded back in a Z-shape in a direction opposite to the folding direction of the sewn end portion 1A (the direction of the arrow in FIG. 1), and the overlapped portion is stitched with four stitches 5 Then, the waterproof fabric of the present invention shown in FIG. 2 is obtained.

At this time, the position of the seam 5 may be anywhere within the width of the folding part 2 as long as it is sewn in the state of four overlapping layers and does not overlap the seam 3, but especially the folding end. It is preferable that the distance is 3 to 10 mm from 4 and is located on the opposite side of the folded end 2 of the folded portion 2 with respect to the seam 3.

1 and 2, the lower side of the figure is the surface of the product.

In the present invention, the sewing method may be either a lock stitch method or a chain stitch method. It should be noted that the above-mentioned stitching structure shows a basic structure, and other stitches may be added to this. Further, the seaming structure of the waterproof cloth of the present invention is formed by bending and sewing the cloth, and for that purpose, it is convenient to sew using an attachment (sometimes called a trumpet).

When sewing the waterproof fabric of the present invention,
It is preferable to use a suture and / or a water-repellent suture containing a low-temperature heat-meltable component because the waterproof property is further improved.

As the suture thread containing the heat-meltable component, 10 heat-meltable fibers having a melting temperature in the range of 90 to 150 ° C. are used.
˜70% by weight mixed suture and / or melting temperature of 90
Examples include sutures coated with 10 to 70% by weight of a hot-melt resin in the range of to 150 ° C.

Specifically, a polyester sewing thread obtained by plying a copolyester filament having a low melting point is preferably exemplified.

When a suture thread containing a heat-meltable component is used, it is necessary to heat the seam portion with an iron or the like after sewing to melt the heat-meltable component and seal the seam. .

Further, as the water repellent suture, a fluororesin,
An example is a suture thread to which a water-repellent agent such as silicone or wax is applied. Specifically, an aliphatic polyepoxy compound having two or more epoxy groups in the molecule has a fixing layer on the surface of polyester fiber. Preferable examples include polyester-based water-repellent sutures which are formed to form a layer in which an amino-modified silicon compound is reactively bonded to the fixing layer.

As the aliphatic polyepoxy compound used for the polyester water repellent suture, a compound containing at least two epoxy groups in one molecule in an amount of 0.2 g equivalent or more per 100 g of the compound is preferably used. ,
For example, it is obtained by oxidizing an unsaturated compound with a reaction product of a polyhydric alcohol such as ethylene glycol, glycerol, sorbitol, pentaerythritol, or polyethylene glycol with a halogen-containing epoxy such as epichlorohydrin, peracetic acid, hydrogen peroxide, or the like. Polyepoxy compounds such as 3,4-epoxycyclohexylethylene oxide, 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate, bis (3,4-epoxy-6-methyl-cyclohexylmethyl) adipate, etc. I can name it.

Of these, a reaction product of a polyhydric alcohol and epichlorohydrin, that is, a polyglycidyl ether compound of a polyhydric alcohol is particularly preferable because it exhibits excellent performance.

The polyepoxy compound is usually used as an emulsion or an aqueous solution. In order to prepare an emulsion or an aqueous solution, for example, the polyepoxy compound as it is, or a solution of the polyepoxy compound dissolved in a small amount of solvent as necessary, a known emulsifier, for example, sodium alkylbenzene sulfonate,
It is emulsified or dissolved using dioctyl sulfosuccinate sodium salt, nonylphenol ethylene oxide adduct and the like.

The amount of the epoxy compound applied to the polyester fiber is 0.1-1.
It is preferably 0% by weight. When the amount is less than 0.1% by weight, the durability of the water-repellent performance of the obtained polyester-based suture is insufficient. Not only is there a disadvantage that the yarn is hardened, which is not preferable.

In order to improve the process stability, the above epoxy compound may be used in combination with a commonly used oil agent for fibers such as a smoothing agent and an antistatic agent. The combination ratio of the epoxy component and the oil agent component is not particularly limited as long as the object of the present invention is not impaired, but usually, the weight ratio of the oil agent component / epoxy compound is preferably 10/90 to 70/30.

The polyester fiber provided with the epoxy compound is heat-treated in order to strengthen the fixation of the epoxy compound. The heat treatment condition is not particularly limited, but a temperature of 70 to 250 ° C. is preferably exemplified in order to prevent the epoxy compound from diffusing and fixing in the polyester fiber and preventing the deterioration of the epoxy compound.

The amino-modified silicone compound used in the above polyester water-repellent suture has an amino-modified group of -R-NH ₂ or -R-NH-CH ₂ NH ₂ (R is a divalent alkylene group). Yes, and the amino equivalent is 30
Those of 00 or less are preferable. If the amino equivalent exceeds 3,000, the water-repellent effect is reduced.

It is desirable to use a low-viscosity lubricant for the amino-modified silicon compound in order to adjust viscosity and enhance lubricity. As such a low-viscosity lubricant, it is compatible with the amino-modified silicon compound and is non-reactive. As long as it has good properties, for example, mineral oils having a redwood viscosity of 200 seconds or less and monobasic acid esters such as isobutyl oleate and isooctyl palmitate are preferably used.

It is desirable that the mixing ratio of the amino-modified silicone compound and the low-viscosity lubricant be appropriately adjusted so that the viscosity at 30 ° C. after dilution is about 60 cst or less. Further, additives such as an antistatic agent and a heat-resistant agent may be dissolved in these solutions, but needless to say, it is necessary that they are non-reactive with the amino-modified silicon compound and that the viscosity is not significantly changed.

The amount of the amino-modified silicon compound applied is
In order to improve the adhesion of the compound to the fiber surface, the ratio with the epoxy compound is within a specific range, that is, epoxy compound / amino-modified silicon compound = 3.
It is preferably 0/70 to 5/95 (weight ratio).

In the fiber provided with the amino-modified silicon compound, the amino-modified silicon is reactively bonded to the epoxy compound by heat treatment to form a stronger water-repellent layer on the fiber surface, so that the durability of the water-repellent performance is remarkably increased. An improved polyester suture is obtained.

There are no particular restrictions on the cross-sectional shape of the polyester fibers constituting the above polyester suture, but when used for embroidery sewing, triangular cross-section fibers excellent in specular reflection gloss are preferred.

[0039] Usually, when the fibers having a triangular cross-section are used, towel stitches (a phenomenon in which the tightness of the stitches is poor and the stitches sag in a loop)
However, when the above polyester-based suture thread is used, there is an advantage in that it is difficult to generate towel stitches.

[0040]

The present inventors have conducted various studies on the mechanism of water leakage from the sutured portion, and as a result, have discovered the phenomenon explained below. That is, there are two types of paths for water leakage from the stitched part, one of which is a water leakage path through which water leaks through the seam hole at the seam formation point (seam hole water leakage), and the other is the cloth. It is a water leakage path (water leakage between cloths) through which water leaks from the gaps between them. The larger the number of sewn fabrics, the smaller the leakage of the seam holes, and the less the amount of inter-fabric water leakage, the more the curved spaces are, rather than the straight gaps between the fabrics.

The sewn structure of the waterproof cloth of the present invention is as shown in FIG. 2, and four sheets are sewn together.

The bent portion on the lower side of the fabric A has little effect of preventing water leakage from the stitch hole, but the stitch hole of the seam 5 has the stitched end portion 1B of the fabric B and the folded portion 2 of the fabric A. Upper 2
Since the sheets are sewn together, the water leakage through the stitch holes is much smaller than that in the conventional stitching structure shown in FIGS. Further, the stitched end portion 1A of the fabric A is folded back to form the folded portion 2, and the gap between the fabrics is bent in a U shape through the fabric B, so that water leakage between the fabrics is small.

Further, in the above-mentioned suturing, when a suture containing a heat-fusible component is sewn and then heated, the seam is closed by the melted material, and it is possible to further reduce the water leakage through the stitch hole. In addition, when sewing is performed using a water repellent suture, water is repelled at the seams, and it is possible to further reduce the water leakage through the stitch holes.

[0044]

EXAMPLES The present invention will be described in more detail below with reference to examples.

[Examples 1 to 3 and Comparative Examples 1 to 6] As a waterproof cloth for testing, an ultra-high density water repellent cloth made of polyester (Condenia manufactured by Teijin Ltd.) was used, and FIG.
3), FIG. 4 (Comparative Examples 1 to 3) and FIG. 5 (Comparative Examples 4 to 6)
The suture structure shown in Fig. 3 was sutured.

In the stitching structure shown in FIG. 2, the folded portion 2
Width is 10 mm, seam 3 is 2 mm from folded end 4 and seam 5
Was a position 5 mm from the folded back end, the stitch type was a lock stitch type, and the stitch pitch was 15 S / 3 cm.

In the sewing structure shown in FIG. 4, the width of the folded portion 10 is 10 mm, the stitch 9 is 1 mm from the folded end, and the stitch 11 is 5 mm from the folded end. The eye pitch was 15S / 3 cm.

Further, in the suture structure shown in FIG. 5, the folded portion 1
The widths of 3A and 13B are 10 mm, the seam 14 is 2 mm from the folded end of the fabric A, and the seam 15 is 8 mm from the folded end of the fabric A. The stitch type is the lock stitch type and the stitch pitch is 15S. It was / 3 cm.

For suturing, the following three kinds of sutures were used.

Suture A: Commercially available polyester filament sewing thread # 50 (Diafeather manufactured by Daikoku Co., Ltd.) was used as it was.

Suture thread B: an oil component mainly composed of polyester fiber and dioleyl adipate, and Denacol EX512 (manufactured by Nagase Kasei Co., Ltd.) as an epoxy compound.
Was added as a 10% emulsion, and 0.3% of the fiber weight was attached. The epoxy-treated yarn was subjected to hot drawing (which also serves as heat treatment) at 120 ° C., and then a treatment agent containing KF857 (manufactured by Shin-Etsu Chemical Co., Ltd.) as an amino-modified silicon compound and butyl oleate at a ratio of 50/50 (viscosity). 20c at 30 ° C
st) was added so as to be 0.5% (the epoxy compound / amino-modified silicon weight ratio is about 38/62) with respect to the fiber weight as the amount of the active ingredient of the amino-modified silicon compound, and then in an atmosphere at 60 ° C. After 2 days, the reaction between the epoxy compound and the amino-modified silicon compound was completed. The resulting fiber (70 de) was twisted into three strands to obtain a water repellent sewing thread # 50.

Suture C: One copolyester filament 70de having a melting point of 130 ° C. and two polyethylene terephthalate filaments 70de were twisted together to obtain a low temperature heat-fusible sewing thread # 50.

Regarding each of the obtained waterproof fabrics, JIS-L
By the 1092-5.1.1A method (low water pressure method), the sample was set so that the seam was in the center, and the water pressure resistance (m
m) was measured and used as a measure of waterproofness.

The results are shown in Table 1, and the waterproof fabric of the present invention (Examples 1 to 3) is obviously superior in waterproof property to the conventional waterproof fabrics (Comparative Examples 1 to 6). Was there. In particular, when the water-repellent sewing thread and the heat-fusible sewing thread were used (Examples 2 and 3), the waterproof property was extremely good.

[0055]

[Table 1]

[0056]

EFFECTS OF THE INVENTION According to the present invention, it is possible to significantly prevent water leakage from a stitched portion, and to provide a waterproof cloth having excellent waterproofness.

[Brief description of drawings]

FIG. 1 is a perspective view for explaining a stitching process of an example of a waterproof fabric of the present invention.

FIG. 2 is a perspective view showing an example of the waterproof fabric of the present invention.

FIG. 3 is a perspective view showing an example of a conventional fabric stitching structure.

FIG. 4 is a perspective view showing an example of a conventional waterproof fabric.

FIG. 5 is a perspective view showing another example of a conventional waterproof fabric.

[Explanation of symbols]

 A, B Fabrics to be sewn 1A, 1B Stitched end 2 Folded part 3 Stitch 4 Folded end 5 Stitch 6A, 6B Folded part 7 Seam 8 Void 9 Stitch 10 Folded part 11 Stitch 12 Gap between fabrics 13A , 13B Folding part 14 Stitch 15 Stitch a, b, c, d Water leakage path

Claims (5)

[Claims] 1. A waterproof fabric obtained by stitching two fabrics A and B together, by folding back the stitched end of one fabric A and inserting the stitched end of the other fabric B into the folded-back portion for polymerization. It is characterized in that three parts are sewn in a stacked state, and further, the fabric A is folded back in a Z-shape in a direction opposite to the direction in which the sewn end part is folded back, and four overlapping parts are sewn in a stacked state. Waterproof fabric to be. 2. The waterproof fabric according to claim 1, wherein the seam in the state where four sheets are piled up is located on the opposite side of the folded end of the folded portion from the seam in the state where three sheets are piled up. 3. The waterproof fabric according to claim 1 or 2, which is sewn with a water repellent suture and / or a suture containing a heat-meltable component. 4. A water-repellent suture, wherein an aliphatic polyepoxy compound having two or more epoxy groups in a molecule forms a fixing layer on the surface of a polyester fiber, and the amino-modified silicone compound is reactively bonded to the fixing layer. The waterproof fabric according to claim 3, wherein the waterproof fabric is a polyester-based water-repellent composite yarn forming the above layer. 5. The amount of the aliphatic polyepoxy compound attached to the polyester fiber is 0.1 to 1.0% by weight, and the weight ratio of the aliphatic polyepoxy compound / amino-modified silicone compound is 30/70 to 5/95. 5. The waterproof cloth according to claim 4.