JPH07207546A - Polyester woven fabric for sailcloth and its production - Google Patents

Abstract

PURPOSE:To obtain polyester woven fabric for sailcloth having a weaving structure of high strength, high modulus of elasticity, low elongation and high density, and to provide a method for producing the polyester woven fabric. CONSTITUTION:This polyester woven fabric for sailcloth comprises a warp group and/or a weft group composed of at least 50wt.% of polyethylene naphthalate yarn, has 130-540g/m<2> weight, >=1,800 cover factor (CF) and, in the case of at least 50wt.% of the warp being polyethylene naphthalate yarn, has <=1,000%.g/m<2> of the product of the weight and elongation of the woven fabric in applying 100 pound load based on 5 inch width in the warp direction of the woven fabric and, in the case where at least 50wt.% of the weft is polyethylene naphthalate yarn, has <=800%.g/m<2> of the product of the weight and elongation of the woven fabric in applying 100 pound load based on 5 inch width in the weft direction of the woven fabric.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester fabric for sailcloth having a high strength, a high elastic modulus, a low elongation and a dense woven structure, and a method for producing the same.

[0002]

2. Description of the Related Art As described in Japanese Examined Patent Publication No. 59-211683, Japanese Examined Patent Publication No. 3-64632, etc., a fabric for sailcloth using polyester fibers is excellent in strength and elastic modulus. In recent years, it has been widely used.

By the way, in addition to high strength, high elastic modulus and low elongation, the sail cloth has a high weaving density and a fine crimp by weaving in order to prevent misalignment of the yarn. It is required to have a woven structure.

In this respect, the polyethylene terephthalate fiber has a high strength and a high elastic modulus and can have a relatively small elongation, but in order to form a dense woven structure, it is necessary to perform shrinkage treatment in a woven state. , When this shrinking process is performed,
There is a drawback that the elongation of the woven fabric becomes large.

On the other hand, a fabric for sailcloth using a para-oriented aramid fiber which has essentially high strength and low elongation has also been proposed (US Pat. No. 4,679,519), but Since the oriented aramid fiber is extremely stable thermally, there is a problem that the woven fabric does not shrink even when subjected to the shrinking treatment, and the dense woven structure in which the crimp is sufficiently developed is not formed.

[0006]

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned problems of the prior art, to provide a polyester for sailcloth having high strength, high elastic modulus, low elongation, and a dense woven structure. It is to provide a woven fabric and a manufacturing method thereof.

[0007]

Means for Solving the Problems The inventors of the present invention have conducted extensive studies in order to achieve the above object, and as a result, have come up with the idea of using polyethylene naphthalate fiber having an increased heat shrinkage stress, The present invention has completed the invention of a polyester fabric for sailcloth having a high elastic modulus and low elongation, a dense and dense woven structure, and a method for producing the same.

That is, according to the present invention, (1) at least 50% by weight of the warp group and / or the weft group is polyethylene naphthalate fiber, and the basis weight is 130 to 540 g / m ² .
In the case of a polyester fabric having a cover factor CF of 1,800 or more, and at least 50% by weight of the warp yarn is polyethylene naphthalate fiber, when a load of 100 pounds per 5 inch width is applied in the warp direction of the fabric. If the product of elongation and basis weight of the fabric is less than 1,000% g / m ² and at least 50% by weight of the weft yarn is polyethylene naphthalate fiber, 100 lbs per 5 inches width in the weft direction of the fabric. Polyester fabric for sailcloth, characterized in that the product of elongation and basis weight of the fabric when loaded is 800% · g / m ² or less, and (2) strength 5 g
/ D or more, heat shrinkage stress at 150 ° C is 0.15 g /
A polyethylene naphthalate fiber of d or more is used for weaving by using at least 50% by weight of warp and / or weft, and shrinks by controlling the shrinkage coefficient K within the range of 0.7 to 0.93. In the method for producing a polyester fabric for a sail cloth according to (1) above, the shrinking treatment is preferably performed at a temperature of 150 ° C. or higher.

The polyethylene naphthalate fiber used in the present invention may be one having at least 85 mol% of the repeating units of the polymer consisting of ethylene-2,6-naphthalate units, and a suitable third ratio is less than 15 mol%. Although it may be a copolymer containing components, the copolymerization component is preferably less than 10 mol% in order to sufficiently exert the effects of the present invention.

As a suitable third component, the following (a)-
(C) is illustrated.

(A) compounds having two ester-forming functional groups, for example, aliphatic dicarboxylic acids such as oxalic acid, succinic acid, adipic acid, sebacic acid and dimer acid; cyclopropanedicarboxylic acid, cyclobutanedicarboxylic acid,
Alicyclic dicarboxylic acids such as hexahydroterephthalic acid;
Aromatic dicarboxylic acids such as phthalic acid, isophthalic acid, naphthalene-2,7-dicarboxylic acid, diphenyldicarboxylic acid; diphenyletherdicarboxylic acid, diphenylsulfonedicarboxylic acid, diphenoxyethanedicarboxylic acid, sodium 3,5-dicarboxybenzenesulfonate Carboxylic acids such as; glycolic acid, p-oxybenzoic acid, p-oxyethoxybenzoic acid and other oxycarboxylic acids; propylene glycol, trimethylene glycol,
Diethylene glycol, tetramethylene glycol, hexamethylene glycol, neopentylene glycol,
p-xylylene glycol, 1,4-cyclohexanedimethanol, bisphenol A, p, p'-diphenoxysulfone-1,4-bis (β-hydroxyethoxy)
Benzene, 2,2-bis (p-β-hydroxyethoxyphenyl) propane, polyalkylene glycol, p-
Oxy compounds such as phenylene bis (dimethylcyclohexane), or functional derivatives thereof; high polymerization degree compounds derived from the above-mentioned carboxylic acids, oxycarboxylic acids, oxy compounds or their functional derivatives.

(B) Compounds having one ester-forming functional group, such as benzoic acid, benzoylbenzoic acid, benzyloxybenzoic acid and methoxypolyalkylene glycol.

(C) Compounds having three or more ester-forming functional groups, such as glycerin, pentaerythritol, and trimethylolpropane, can also be used within the range where the polymer is substantially linear.

The fiber may contain known additives such as stabilizers and matting agents.

The strength of the polyethylene naphthalate fiber used in the present invention must be 5 g / d or more, and preferably 7 g / d or more.
When the strength is less than 5 g / d, the strength of the sail cloth is lowered and the sail cloth is easily broken even when sheared or torn, which is not suitable. In order to obtain a high-strength polyethylene naphthalate fiber, it is preferable that the degree of polymerization of the polymer is high, and the intrinsic viscosity is preferably 0.5 or more.

Further, a remarkable feature of the present invention is that polyethylene naphthalate fiber having high heat shrinkage stress is used.

The heat shrinkage stress value at 150 ° C. is required to be 0.15 g / d or more, preferably 0.2 g / d or more.

The polyethylene naphthalate fiber is originally
It has a high strength, a high elastic modulus and a low elongation, but has a low shrinkage, and when manufactured by a conventionally known method, the heat shrinkage stress becomes considerably low. For example, when polyethylene naphthalate fiber is manufactured by the method disclosed in Japanese Patent Publication No. Sho 48-1967, the value of heat shrinkage stress at 150 ° C. is 0.05.
It becomes about g / d or less.

Therefore, in the present invention, only the heat shrinkage stress is increased while maintaining the properties of polyethylene naphthalate fiber such as high strength, high elasticity and low elongation, and the sail having a low elongation and a dense woven structure. The idea was to get a cloth fabric.

Strength used in the present invention is 5 g / d or more, 150
The polyethylene naphthalate fiber having a heat shrinkage stress of 0.15 g / d or more at 0 ° C. is melt-spun, for example, polyethylene naphthalate having an intrinsic viscosity of 0.5 or more, and 120 to 1
It can be obtained by preheating to 65 ° C., stretching 5 times or more, and heat setting at a low temperature of 165 ° C. or lower.
After the heat setting, 1.0 to 1.
When stretched 05 times, the strength and heat shrinkage stress are further improved.

In the polyester fabric for sailcloth of the present invention, it is necessary to use the above polyethylene naphthalate fiber in at least 50% by weight of the warp group and / or the weft group. 50 polyethylene naphthalate fibers
If it is less than 10% by weight, a fabric having high elasticity and low elongation cannot be obtained.
The higher the proportion of polyethylene naphthalate fiber, the more preferable, and it is particularly preferable to use 100% polyethylene naphthalate fiber.

Polyethylene terephthalate fibers are preferred as other fibers commonly used with polyethylene naphthalate fibers, but wholly aromatic polyester fibers, wholly aromatic polyester / polyether fibers, para-oriented aramid fibers and the like can also be used.

When polyethylene naphthalate fibers are used in combination with other fibers, a warp and / or weft made of polyethylene naphthalate fibers and a warp and / or weft made of other fibers are usually mixed and mixed. You may use the mixed fiber yarn of a naphthalate fiber and another fiber, a gathering yarn, etc.

When the polyethylene naphthalate fiber and the other fiber are mixed and woven, the polyethylene naphthalate fiber and the other fiber are alternately arranged, and the warp yarns and / or the weft yarns are arranged so that yarns of the same kind are not adjacent to each other as much as possible. It is necessary to.

Polyethylene naphthalate fiber is a warp,
It may be used for either of the weft yarns, or may be used for both of them, but it is particularly preferable to use it for the warp yarn because a fabric for sailcloth having a low elongation in the warp direction can be obtained.

The basis weight of the polyester fabric for sailcloth of the present invention is required to be in the range of 130 to 540 g / m ² . When the basis weight is less than 130 g / m ² , the strength of the woven fabric becomes weak as a whole, the texture is likely to be deformed, and it becomes technically difficult to increase the cover factor. On the other hand, when the basis weight exceeds 540 g / m ² , the sail cloth becomes heavy and the handleability is impaired.

Further, the cover fabric CF of the polyester fabric for sailcloth of the present invention must be 1,800 or more, preferably 2,000 to 3,200.
Is. The cover factor CF is defined by the following equation.

[0028]

[Equation 1]

It is preferable to use the same yarn denier as the warp yarns, but when yarns of different yarn denier are mixed and used, the average denier is the warp yarn denier. The same applies to the weft. When the cover factor CF is less than 1,800, the feeling of see-through of the woven fabric becomes large, and a strong sail cloth structure cannot be obtained. When the weave is constant, the smaller the yarn denier, the larger the cover factor, but the higher the cost of the raw yarn and the remarkably difficult weaving. Therefore, a yarn of 75 to 500 d is usually used.

Further, when at least 50% by weight of the warp group is polyethylene naphthalate fiber, the elongation at a load of 100 pounds per 5 inches in width in the warp direction of the fabric (hereinafter referred to as 100 lb load elongation). ) (%) And fabric weight (g / m ² ) product (% · g / m ² ) is 1,000%
When the weft yarn group is g / m ² or less and at least 50% by weight of the weft yarn is polyethylene naphthalate fiber, the elongation when a load of 100 pounds per 5 inch width is applied in the weft direction of the fabric (hereinafter referred to as 100 lb load elongation). (%) And the basis weight (g / m ² ) of the woven fabric (% · g / m ² ) are 800% · g /
It is necessary to make it m ² or less.

This value is 1,000% g / m, respectively.
^When it exceeds ² , 800% · g / m ² , the elastic modulus is inevitably lowered, and the propulsive force when the sail cloth receives wind is reduced. This value is particularly preferably 500% · g / m ² or less.

Whether to increase the elastic modulus in the warp direction or the elastic modulus in the weft direction can be arbitrarily selected according to the design concept of the sail cloth. Needless to say, it is preferable to have high elasticity in both directions.

To produce the polyester fabric for sailcloth of the present invention, the above-mentioned strength of 5 g / d or more, 1
A polyethylene naphthalate fiber having a heat shrinkage stress of 0.15 g / d or more at 50 ° C. is woven into at least 50% by weight of the warp group and / or the weft group, and the obtained raw fabric is shrinkage coefficient K represented by the following formula. Is 0.7 to 0.93
It may be contracted while controlling so that

[0034]

[Equation 2]

When the shrinkage coefficient K exceeds 0.93, the woven structure is insufficiently densified due to shrinkage, and the yarn is apt to be displaced,
Durability as a sail cloth decreases. Moreover, the feeling of see-through becomes large and it becomes unsatisfactory as a sail cloth.

On the other hand, it is basically difficult to make the shrinkage coefficient K less than 0.7 in the high-density fabric of the present invention, and the shrinkage is too large to finish a uniform fabric.
A particularly preferable value of the shrinkage coefficient K is 0.8 to 0.9, and if it is in this range, the finishing process can be carried out particularly smoothly.

Since the heat shrinkage stress of the polyethylene naphthalate fiber used in the present invention has a peak value in the range of 140 to 170 ° C., when the woven fabric is slightly shrunk while applying tension at a temperature of 150 ° C. or higher, The fabric is extremely dense. As a preferable method for producing a fabric for sailcloth, it is extremely effective to scouring a woven woven fabric and subjecting it to resin treatment at 100 ° C. or higher, followed by heat shrink treatment at a temperature of 150 ° C. or higher. In this case, the shrinkage of the width of the woven fabric is appropriately controlled to 7 to 12%, and 0.8 to
This corresponds to a shrinkage coefficient K of 0.9.

[0038]

The sail cloth is required to have a high degree of dimensional stability. For that purpose, it is preferable that the fiber used has low elongation and low shrinkage in principle.

Therefore, for example, fibers having a high elastic modulus and a low elongation such as para-oriented aramid fibers are considered to be suitable, but the fibers having a low elongation have a problem that weaving is extremely difficult. Further, since the fibers do not have a shrinking ability, it is not possible to finish a dense and dense woven structure.

Polyethylene terephthalate fiber is a general-purpose material that has been used for sailcloth in the past, and since it has an appropriate shrinkage ability, it can be made into a dense woven structure by heat treatment after weaving, but this shrinkage causes the molecular weight to decrease. Is relaxed in the fiber axis direction, the elastic modulus is lowered, the elongation is increased, and it is difficult to obtain a sail cloth having a high elastic modulus and a low elongation.

On the other hand, in the present invention, since polyethylene naphthalate fibers having a high shrinkage ability are used, a high density and dense woven structure can be obtained by shrinkage heat treatment of the woven fabric after weaving. Further, it is possible to obtain a woven fabric for sailcloth having a high elastic modulus and a low elongation without lowering the elastic modulus and the elongation by the shrinkage heat treatment.

[0042]

EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited to these examples.

The physical properties of the fiber or woven fabric of the present invention were measured by the following methods.

(1) Strength and Elongation The strength and elongation of the fiber were measured according to JIS-L-1017. Sample length is 20 cm, extension rate is 100% /
Minutes

(2) Initial elastic modulus The initial elastic modulus of the fiber was measured according to the initial tensile resistance of JIS-L-1017.

(3) Intrinsic Viscosity Chips were dissolved in a mixed solvent of phenol and 2,4,6-trichlorophenol (weight ratio 6: 4), and the viscosity was determined from the running time at 35 ° C.

(4) Thermal shrinkage stress The thermal shrinkage stress was measured from room temperature by using a thermal stress tester (type KE-II) manufactured by Kanebo Engineering Co., Ltd. and applying a load of 10 mg / d to the fiber sample in advance. Three
The stress generated when the temperature was raised to 00 ° C at a rate of 2.4 ° C / sec was read at each temperature.

(5) 100 lb load elongation A rectangular sample having a width of 5 inches or more and a length corresponding to an integral multiple of the repeating unit of the woven fabric and a length of 20 inches is cut out from the woven fabric to be measured. The direction in which to measure either warp or weft was taken as the length direction, the sample was extended at a gripping interval of 16 inches and a pulling speed of 20 mm / min, and the elongation corresponding to a load corresponding to 100 lbs per 5 inches was read. .

[Example 1] A polyethylene-2,6-naphthalate chip having an intrinsic viscosity of 0.63 was discharged from a spinneret having a circular spinning hole of 48 holes and a hole diameter of 0.40 mm at a spinning temperature of 300 ° C. And spinning speed 150m /
Then, the temperature of the heating spinning cylinder installed immediately below the spinneret was set to 390 ° C. and melt spinning was performed.

The unstretched yarn was wound around a heating roller having a surface temperature of 145 ° C. eight times and heated, and then wound around a first stretching roller at 145 ° C. and stretched 6.55 times. Then, the film was stretched 1.05 times between the first stretching roller and the second stretching roller at 120 ° C. to obtain 150d / 48fil and 250d / 48f.
il polyethylene naphthalate (hereinafter abbreviated as PEN) fibers A and B were obtained.

On the other hand, for comparison, Japanese Patent Publication No. 55-371
No. 1, Example 1, Experiment No. In accordance with 5, stretched 6.03 times with a first stretching roller at 175 ° C. and further stretched 1.14 times with a second stretching roller heated to 200 ° C. to give a total stretching ratio of 6.87 times. And drawn to obtain 150 d / 48 fil and 250 d / 48 fil PEN fibers C, D.

Furthermore, regarding the polyethylene terephthalate (hereinafter abbreviated as PET) fiber which has been conventionally used, it has a fiber density of 150 d / fil and 250 d / fil.
Types of fibers E and F were created.

Table 1 shows the production conditions and physical properties of each fiber.

[0054]

[Table 1]

A graph of heat shrinkage stress of A, C and E is shown in FIG.

Then, weaving was carried out using the fibers thus obtained. As shown in Table 2, for both the PET fiber and the PEN fiber, 150d / 48f was used for the warp and 2
50d / 48f was used for the weft.

As the woven design, the warp yarn was set to 116 yarns / inch and the weft yarn was set to 60 yarns / inch, and woven in a water jet loom.

The woven greige was scoured, processed into a resin, and then subjected to shrinkage heat treatment at 190 ° C. The shrinkage heat treatment was carried out under tension such that the width of the fabric was limited to about 10% shrinkage.

The woven fabric thus set was subjected to calendering treatment, and the width was slightly adjusted to finish the woven fabric for sailcloth.

The physical properties of the resulting fabric for sailcloth are shown in Table 2.

[0061]

[Table 2]

The woven fabric (Experiment No. 1) using PEN fibers A and B having a large heat shrinkage stress is for a sail cloth which has high strength and high elastic modulus, small elongation under load, and a dense woven structure and excellent. I was able to finish it into a woven fabric.

Even with PEN fibers, when the fibers C and D having a small heat shrinkage stress were used (Experiment No. 2), the shrinkage coefficient K was obtained even if weaving was performed and an appropriate width inserting treatment or heat treatment was performed.
Was not enough, and the woven structure became loose. This fabric was tested in Experiment No. Similar to No. 1, it had high strength, high elasticity, and low elongation to load, but when it was used as a sail cloth, it was easily deformed due to misalignment of the yarn, and could not withstand long-term use.

Conventionally used PET fibers E and F
The fabric (Experiment No. 3) prepared by using the above-mentioned fabric showed satisfactory values for the basis weight, the shrinkage coefficient and the cover factor, but the elongation to the load was large, and therefore, the value of 100 lb load elongation x basis weight was 1. When it exceeds 000% · g / m ² , the elastic modulus of the woven fabric is lowered, and when it is used for a sail cloth, running property is lowered.

[Example 2] PEN fibers A and PET fibers E used in Example 1 were appropriately combined to warp a warp yarn in which PEN fibers and PET fibers were mixed, and PET fibers F were used as weft yarns. A fabric for sale cloth was woven in a water jet room. The weaving and processing conditions are the same as in Example 1.
Experiment No. It was the same as 1. The results are shown in Table 3.

[0066]

[Table 3]

When 50% by weight or more of PEN fiber was used as the warp (Experiment No. 4), high strength and high elastic modulus were obtained.
An excellent woven fabric for sailcloth having a high density and a dense woven structure was obtained, which had a small elongation with respect to the load in the warp direction. In this case, the PEN fibers and the PET fibers were arranged by alternately arranging four of them and then arranging two PEN fibers next to the PET fibers.

On the other hand, when the amount of PEN fiber is less than 50% by weight (Experiment No. 5), the elongation with respect to the load in the longitudinal direction is increased, and the value of 100 lb load elongation x basis weight is 1.0.
When it exceeded 100% · g / m ² , the elastic modulus decreased, and was about the same as in the case of 100% PET fiber (Experiment No. 3 of Example 1). In this case, PEN fiber and PE
The T fibers were arranged by alternately arranging four fibers of each of them and then arranging two PET fibers next to the PEN fibers to repeat warping.

[Example 3] The PEN fiber B and the PET fiber F used in Example 1 were appropriately mixed with the weft yarn, and the warp yarn was made of PET.
A textile for sailcloth was prepared using the fiber E. The weaving and processing conditions are the same as Experiment No. 1 of Example 1. Same as 1. The results are shown in Table 4.

[0070]

[Table 4]

When 50% by weight or more of PEN fiber was used as the weft (Experiment No. 6), high strength and high elastic modulus were obtained.
An excellent fabric for sailcloth having a high density and a dense woven structure, which has a low elongation with respect to the load in the weft direction, was obtained. In this case, the arrangement of the PEN fibers and the PET fibers in the weft was such that four of them were alternately arranged and driven, and then two of the PEN fibers were arranged and driven next to the PET fibers.

On the other hand, when the amount of PEN fiber is less than 50% by weight (Experiment No. 7), the elongation with respect to the load in the weft direction increases, and the value of 100 lb load elongation × unit weight is 800.
%, G / m ² was exceeded and the elastic modulus decreased, making the fabric unsuitable for sailcloth. In this case, the arrangement of the PEN fibers and the PET fibers in the weft is such that four of each of them are alternately arranged and driven, and then P is placed next to the PEN fibers.
Repeatedly driving two ET fibers side by side.

[Embodiment 4] Experiment No. 1 of Embodiment 1 In Example 1, the weaving density was changed to weave fabrics having different basis weights and cover factors, and Experiment No. 1 of Example 1 was used. The same processing and finishing as 1 were performed. The results are shown in Table 5.

[0074]

[Table 5]

When the fabric weight is 130 g / m ² or more and the cover factor is 1800 or more (Experiment No. 8), the woven structure becomes strong and it is possible to finish the product suitable for sailcloth.

On the other hand, the weave density is coarse and the fabric weight is 13
When it was less than 0 g / m ² and the cover factor was less than 1,800 (Experiment No. 9), the woven fabric had a large feeling of see-through, and the woven fabric structure was easily broken, so that it was completely unusable as a sail cloth.

The cover factor is 1800 or more, but the basis weight is less than 130 g / m ² (Experiment No.
In No. 10), the strength of the woven fabric became weak as a whole, the texture was easily deformed, and the sail cloth could not withstand long-term use.

[Embodiment 5] Experiment No. 1 of Embodiment 1 In No. 1, the shrinkage coefficient K was changed as shown in Table 6 by changing and controlling shrinkage of the width of the woven fabric during shrinkage heat treatment.

[0079]

[Table 6]

When the shrinkage coefficient K is in the range of 0.7 to 0.93 (Experiment Nos. 12 and 13), a dense and dense woven structure is obtained, and the fabric for sailcloth has excellent durability. was gotten.

On the other hand, when the shrinkage coefficient K exceeds 0.93 (Experiment No. 14), the densification of the woven structure is insufficient and the yarn is apt to be displaced, resulting in poor durability. .

When the shrinkage coefficient K was set to be less than 0.7 (Experiment No. 11), the shrinkage was too large to obtain a uniform woven fabric.

[0083]

Industrial Applicability According to the present invention, it is possible to provide a polyester fabric for a sail cloth which has high strength, high elastic modulus, low elongation and high density, and has excellent durability. it can.

[Brief description of drawings]

FIG. 1 is a graph showing the relationship between heat shrinkage stress of fibers and temperature.

[Explanation of symbols]

 A Polyethylene naphthalate fiber of the present invention C Conventional polyethylene naphthalate fiber E Polyethylene terephthalate fiber

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shigeru Takahashi 1-6-7 Minamihonmachi, Chuo-ku, Osaka-shi, Osaka Inside Teijin Limited

Claims (3)

[Claims] 1. At least 50% by weight of the warp group and / or the weft group is polyethylene naphthalate fiber,
Unit weight is 130-540g / m ² , cover factor CF
Is a polyester woven fabric of 1,800 or more and at least 50% by weight of the warp yarn is polyethylene naphthalate fiber, 10 per 5 inch width in the warp direction of the woven fabric.
The product of elongation and basis weight of the fabric under a load of 0 pounds is less than 1,000% · g / m ² and at least 5 of the weft
When 0% by weight is polyethylene naphthalate fiber, the product of the elongation and the basis weight of the fabric is 800% · g when a load of 100 pounds per width of 5 inches is applied in the weft direction of the fabric.
/ M ² or less, a polyester woven fabric for sailcloth. 2. A polyethylene naphthalate fiber having a strength of 5 g / d or more and a heat shrinkage stress at 150 ° C. of 0.15 g / d or more is used in at least 50% by weight of the warp group and / or the weft group and woven. , The shrinkage coefficient K is 0.7
The method for producing a polyester woven fabric for sailcloth according to claim 1, wherein the polyester fabric is contracted by being controlled to fall within the range of 0.93. 3. The method for producing a polyester fabric for sailcloth according to claim 2, wherein the polyester fabric is contracted at a temperature of 150 ° C. or higher.