JP5943797B2 - Warp knitted fabric - Google Patents

Warp knitted fabric Download PDF

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JP5943797B2
JP5943797B2 JP2012214320A JP2012214320A JP5943797B2 JP 5943797 B2 JP5943797 B2 JP 5943797B2 JP 2012214320 A JP2012214320 A JP 2012214320A JP 2012214320 A JP2012214320 A JP 2012214320A JP 5943797 B2 JP5943797 B2 JP 5943797B2
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knitted fabric
warp knitted
polyester
composite fiber
melting point
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JP2014070279A (en
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泰弘 冨路本
泰弘 冨路本
真菜未 小島
真菜未 小島
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ユニチカトレーディング株式会社
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Description

  The present invention relates to a warp knitted fabric, and particularly to a warp knitted fabric having a small thickness and excellent rigidity.

  Polyester fibers are indispensable as clothing and industrial materials because of their excellent dimensional stability, weather resistance, mechanical properties, durability, and recyclability, and are used in various fields.

  In recent years, from the viewpoint of environmental consideration, polyester fibers having heat-fusible properties are being reviewed as an alternative to urethane-based and acrylic-based heat-adhesive resins. Above all, polyester long fibers are excellent in handling, and are being reviewed in fields with high demands such as various apparel applications, interior applications such as chair upholstery and partitioning, and material applications such as filters.

  A number of core-sheath type composite fibers in which a high melting point polyester is disposed in the core and a low melting point polyester is disposed in the sheath have been proposed as the polyester fiber having the heat-fusibility. The fibers can maintain a fiber form without melting the core during heat treatment, melt only the sheath and bond the fibers to each other, thereby obtaining a product having excellent strength.

  As the core-sheath type composite fiber, a core-sheath type composite fiber is known in which a polyester whose main repeating unit is ethylene terephthalate is used as a core part, and a polymer whose softening temperature is 130 to 200 ° C. is used as a sheath part (for example, Patent Document 1). According to the core-sheath type composite fiber, it has a predetermined strength and elongation characteristic, there is little difference in heat shrinkage rate from the base fiber to be knitted, misalignment due to deviation at the bonding intersection, It is said that a warp knitted fabric of good quality can be obtained without being generated.

  A palatable beverage extraction filter and an extraction bag using a warp knitted fabric made of polyester fiber having a double core / sheath structure with a melting point difference of 100 ° C. or more are also known (see, for example, Patent Document 2). According to the extraction filter and the extraction bag, the bending rigidity and the bending recovery property are high, the three-dimensional shape is excellent, the elastic recovery force is excellent when deformed, and a soft feeling is given when touching a finger. The texture is also excellent.

Japanese Patent Laid-Open No. 62-184119 JP 2000-128233 A

  As for the core-sheath type composite fiber described in Patent Document 1, the polymer in the sheath part is exemplified by a polyester copolymerized with isophthalic acid as a preferred composition of the polymer having a softening temperature of 130 to 200 ° C. It has low crystallinity and does not have a clear melting point, and the sheath softens at a temperature above the glass transition point. For this reason, the warp knitted fabric made of the core-sheath type composite fiber has a problem in that unevenness occurs in adhesion between the composite fibers when heat-treated, resulting in poor dimensional stability and rigidity.

  Since the polyester fiber described in Patent Document 2 also has an isophthalic acid as an essential constituent component of the sheath, the warp knitted fabric made of the polyester fiber has unevenness in bonding between the fibers when heat-treated, There was a problem that the dimensional stability and rigidity were inferior.

  Conventionally, regarding a warp knitted fabric made of a core-sheath type composite fiber, the heat-fusibility at the intersection has been studied in detail, but the rigidity has not been examined in detail.

  The present invention focuses on the rigidity of a warp knitted fabric composed of a core-sheath type composite fiber, and is intended to solve the above problems and provide a warp knitted fabric having a small thickness and excellent rigidity. is there.

  As a result of intensive studies focusing on the rigidity of the warp knitted fabric composed of the core-sheath composite fiber, the present inventors have knitted a yarn composed of a specific core-sheath composite fiber into a specific knitted structure and applied heat treatment. It was found that the warp knitted fabric was excellent in rigidity while being thin, and reached the present invention. That is, the gist of the present invention is the following (1) to (4).

(1) Consists of two types of polyesters having different melting points, from a core-sheath type composite fiber in which a polyester having a high melting point is disposed in a core part and a polyester having a low melting point among the polyesters is disposed in a sheath part. The warp knitted fabric is knitted by a yarn, and the warp knitted fabric is alternately left and right with a swing width of 1 to 4 wales per course. A knitted fabric formed by knitting, and a warp knitted fabric density (/ (2. The number of courses / 2.54 cm) and a wale density (the number of wales / 2.54 cm) of the warp knitted fabric (/ (2. 54 cm) 2 ) is 1200 (/(2.54 cm) 2 ) or more, the thickness of the warp knitted fabric is 1 mm or less, and the bending resistance of the warp knitted fabric in both the course direction and the wale direction is 7 cm or more. so A warp knitted fabric characterized by being.
(2) Consists of two types of polyesters having different melting points, from a core-sheath type composite fiber in which a polyester having a high melting point is arranged in the core and a polyester having a low melting point among the polyesters is arranged in a sheath And a warp knitted by a yarn composed of non-heat-bondable polyester fibers having a single yarn fineness of 2.0 dtex or more and a melting point of 30 ° C. higher than that of the polyester having the low melting point. The warp knitted fabric is a knitted structure in which the yarn composed of the core-sheath type composite fiber is knitted alternately left and right with a swing width of 2 to 4 wales per course, and the polyester fiber A knitted fabric in which the yarns made of knitted yarns are alternately knitted on the left and right sides with a wobbling width of 1 wale or more per course and smaller than the wobbling width of the core-sheath composite fiber by 1 wale or more. Becomes because weave, said warp knitted fabric of the course density (number of courses per 2.54 cm) and wale density warp knitted fabric density expressed by the product of (number of wales /2.54cm) (/(2.54cm) 2) is It is 1200 (/(2.54 cm) 2 ) or more, the thickness of the warp knitted fabric is 1 mm or less, and the bending resistance of the warp knitted fabric in the wale direction and the course direction is both 7 cm or more. Warp knitted fabric.
(3) The polyester having a high melting point is a polyester having an alkylene terephthalate unit as a main component and a melting point of 220 ° C. or higher, and the polyester having a low melting point is 30 ° C. or lower than the polyester having a high melting point. The warp knitted fabric according to (1) or (2) above, wherein the yarn comprising the core-sheath type composite fiber contains 40% by mass or more based on the entire warp knitted fabric.
(4) The polyester having a low melting point is a copolymerized polyester comprising a terephthalic acid component and an ethylene glycol component, and including at least one component of a 1,4-butanediol component, an aliphatic lactone component, and an adipic acid component. The warp knitted fabric according to any one of the above (1) to (3).

  According to the present invention, a warp knitted fabric having a small thickness and excellent rigidity can be obtained. The warp knitted fabric can be used in a wide area such as filters, clothing, clothing interlining, cushions, interiors, and industrial materials.

It is a schematic diagram showing the knitting structure | tissue used for the warp knitted fabric of Examples 1, 2, 5, 6 and Comparative Examples 1-5 of this invention. It is a schematic diagram showing the knitting structure | tissue used for the warp knitted fabric of Example 3, 4 of this invention. It is a schematic diagram showing the knitting structure | tissue used for the warp knitted fabric of the comparative examples 6 and 7 of this invention.

  Hereinafter, the present invention will be described in detail.

  The warp knitted fabric of the present invention is composed of two kinds of polyesters having different melting points. Among the polyesters, a polyester having a high melting point (hereinafter sometimes abbreviated as “polyester A”) is formed in the core, and among the polyesters. By a yarn (hereinafter sometimes abbreviated as a composite fiber yarn) comprising a core-sheath type composite fiber in which a polyester having a low melting point (hereinafter sometimes abbreviated as polyester B) is disposed in the sheath portion. Be organized.

  In the present invention, a polyester is a polymer having an ester bond in a molecular chain, and includes a homopolymer represented by polyethylene terephthalate, a copolymer or a blend polymer, and the like.

  When the warp knitted fabric knitted by the composite fiber yarn is heat-treated at a temperature not lower than the melting point of the polyester B and not higher than the melting point of the polyester A, only the polyester B is melted, and the composite fiber yarns constituting the warp knitted fabric, Alternatively, since the composite fiber yarn constituting the warp knitted fabric and other fibers knitted together with the composite fiber yarn are heat-sealed, the warp knitted fabric of the present invention has excellent rigidity.

  In the present invention, the polyester A is preferably a polyester having a melting point of 220 ° C. or higher mainly composed of alkylene terephthalate units.

  By setting the melting point of the polyester A to 220 ° C. or higher, it becomes easy to stably produce the composite fiber yarn, and the warp knitted fabric of the present invention is preferable because the dimensional change when heat-treated becomes small.

  Examples of the polyester mainly composed of alkylene terephthalate units include polyesters mainly composed of ethylene terephthalate units, butylene terephthalate units or trimethylene terephthalate units. As the polyester A, in addition to a polyester mainly composed of an alkylene terephthalate unit as a single component, other components can be blended or copolymerized. When polyester A is polyethylene terephthalate whose ethylene terephthalate unit is 95 mol% or more of all repeating units, the warp knitted fabric of the present invention is excellent in thermal stability, which is preferable.

  Other components that can be blended or copolymerized with the polyester based on the alkylene terephthalate unit include, for example, isophthalic acid, 5-sodium sulfoisophthalic acid, phthalic anhydride, naphthalene carboxylic acid, trimellitic acid, pyromellitic acid Acid components such as adipic acid, azelaic acid, sebacic acid, dodecanedioic acid, 4-hydroxybenzoic acid, e-caprolactone, phosphoric acid, glycerin, diethylene glycol, 1,4-butanediol, trimethylpropane, 1,4-cyclohexanedi Examples include methanol, neopentyl glycol, pentaerythritol, ethylene oxide adduct of 2,2-bis {4- (β-hydroxy) phenyl} propane, and the like.

  In the present invention, the polyester B is preferably a polyester having a melting point lower than that of the polyester A by 30 ° C. or more.

  By setting the difference between the melting points of polyester B and polyester A to 30 ° C. or higher, the heat treatment temperature of the warp knitted fabric can be lowered, and the strength of the warp knitted fabric and heat shrinkage hardly occur due to the heat treatment.

  In the present invention, the polyester B is preferably a copolyester comprising a terephthalic acid component and an ethylene glycol component and including at least one component of a 1,4-butanediol component, an aliphatic lactone component, and an adipic acid component.

  When the polyester B is the above component, the crystallinity of the core-sheath composite fiber is increased, and the crystallization speed is increased. Thereby, the composite fiber yarns constituting the warp knitted fabric or the composite fiber yarns constituting the warp knitted fabric and other fibers knitted together with the composite fiber yarns are uniformly bonded, This is preferable because the rigidity is further improved.

  When 1,4-butanediol component is copolymerized in polyester B, the copolymerization amount of 1,4-butanediol component is preferably 40 to 60 mol% with respect to the total glycol component. When the copolymerization amount is less than 40 mol% or exceeds 60 mol%, the melting point of polyester B tends to be high.

  When the aliphatic lactone component is copolymerized in the polyester B, the amount of the aliphatic lactone component is preferably 20 mol% or less, more preferably 10 to 20 mol%, based on the total acid component. By setting the copolymerization amount to 10 mol% or more, it becomes easy to set the melting point of the polyester B to a temperature (130 to 200 ° C.) preferable as a heat-fusible fiber described later. On the other hand, when the copolymerization amount is 20 mol% or less, the crystallinity of polyester B is increased, and the composite fiber yarn is less likely to cause single yarn adhesion during spinning.

  As the aliphatic lactone component, the crystallinity of polyester B is improved, and the melting point of polyester B is set to a preferable temperature (130 to 200 ° C.) as a heat-fusible fiber described later. 11 lactones are preferred, and particularly preferred lactones include ε-caprolactone (ε-CL).

  In the polyester B, when the adipic acid component is copolymerized, the copolymerization amount of the adipic acid component is preferably 20 mol% or less, more preferably 10 to 20 mol% with respect to the total acid component. By setting the copolymerization amount to 10 mol% or more, it becomes easy to set the melting point of the polyester B to a temperature (130 to 200 ° C.) preferable as a heat-fusible fiber described later. On the other hand, when the copolymerization amount is 20 mol% or less, the crystallinity of polyester B is increased, and the composite fiber yarn is less likely to cause single yarn adhesion during spinning.

  When the polyester B is a polyester having a melting point of 130 to 200 ° C, a glass transition point of 20 to 80 ° C, and a crystal start temperature of 90 to 130 ° C, the composite fiber yarn is preferable in terms of functionality as a heat-fusible fiber. Cheap.

  When the melting point of the polyester B is 130 ° C. or higher, the warp knitted fabric of the present invention has excellent heat resistance in a high temperature atmosphere. On the other hand, when the melting point is 200 ° C. or less, the heat treatment temperature can be made relatively low, which is economically preferable, and the strength of the warp knitted fabric and the heat shrinkage hardly occur due to the heat treatment.

  When the glass transition point of the polyester B is 20 ° C. or higher, the composite fiber yarn is less likely to cause close contact between single yarns during melt spinning. On the other hand, when the glass transition point is 80 ° C. or lower, the composite fiber yarn can be subjected to a drawing heat treatment at a relatively low temperature, and the fiber structure is less likely to be uneven and has excellent drawability.

  When the crystallization start temperature of polyester B is 90 ° C. or higher, the composite fiber yarn is less likely to have stretch spots, and it becomes easier to reconstruct a stable crystal structure during heat treatment, thereby obtaining a warp knitted fabric having sufficient strength. It becomes easy. On the other hand, when the temperature is 130 ° C. or lower, the melting point of the polyester B becomes relatively low, and the composite fiber yarn is suitable as a heat-fusible fiber.

  The core / sheath composite fiber constituting the composite fiber yarn preferably has a core / sheath mass ratio (core / sheath) in the range of 4/6 to 8/2. When the mass ratio is 4/6 or more, the warp knitted fabric tends to have excellent strength after heat treatment. In addition, the dry fiber dimensional change rate of the composite fiber yarn described later tends to be low, and the thickness of the warp knitted fabric after the heat treatment tends to be thin. Further, when the mass ratio is 8/2 or less, the composite fiber yarn tends to have excellent heat-fusibility, and the warp knitted fabric subjected to heat treatment can easily obtain sufficient rigidity.

  In the present invention, the composite shape of the core-sheath type composite fiber is not particularly limited as long as the effect of the present invention is not impaired, and may be either a concentric type or an eccentric type.

  In the present invention, polyester A and polyester B may contain additives such as an antioxidant, a matting agent, a colorant, a lubricant, and a crystal nucleating agent as long as the effects of the present invention are not impaired.

  In the present invention, the composite fiber yarn means a monofilament yarn composed of one continuous core-sheath type composite fiber, a multifilament yarn composed of a plurality of continuous core-sheath type composite fibers, and a core-sheath type composite shortened. Examples thereof include spun yarn made of fiber. When the composite fiber yarn is a multifilament yarn or spun yarn, when the warp knitted fabric is subjected to heat treatment, the core-sheath type composite fibers constituting the multifilament yarn or spun yarn constituting the warp knitted fabric are heated. The fact that the multifilament yarn or the spun yarn itself has rigidity is preferably combined with the rigidity of the warp knitted fabric, which is preferable.

  The total fineness of the composite fiber yarn is not particularly limited as long as the thickness of the warp knitted fabric can be knitted to a desired value, but sufficient warp knitted fabric rigidity is obtained when heat-treated. Therefore, it is preferably 200 dtex or less, more preferably 30 to 150 dtex, and still more preferably 50 to 150 dtex. The fineness (single yarn fineness) of the core-sheath composite fiber is not particularly limited as long as it can be knitted so that the thickness of the warp knitted fabric becomes a desired value. The composite fiber yarn may be processed yarn subjected to false twisting, actual twisting, or the like.

  The composite fiber yarn preferably has good dimensional stability after heat treatment. Specifically, the dry heat dimensional change rate shown below is preferably 20% or less, more preferably 15% or less. preferable. When the dry heat dimensional change rate of the composite fiber yarn is 20% or less, the composite fiber yarn is hardly contracted by the heat treatment, and the thickness of the warp knitted fabric is hardly increased.

Dry heat dimensional change rate: JIS L 1013: 2010 8.13 According to the method of measuring the dry heat dimensional change rate of the B method, the dry heat temperature is set to the melting point of the polyester B + 10 ° C., and the composite fiber yarn of the present invention is used. A dry heat treatment is performed for 15 minutes with no load, and each yarn length is measured under a load of 50 mg / dtex before and after the treatment, and is calculated by the following formula (I).
S: Dry heat dimensional change rate (%) = {(MS-GS) / MS} × 100 (I)
GS: Length after dry heat treatment (cm), MS: Length before dry heat treatment (cm)

  It is preferable that the composite fiber yarn has a high strength retention after heat treatment because the strength of the warp knitted fabric is high. Specifically, the strength retention shown below is preferably 60% or more, and more preferably 70% or more.

Strength retention: Dry heat temperature was set to the melting point of polyester B + 10 ° C., and the composite fiber yarn was subjected to dry heat treatment for 15 minutes with no load, and the strength before and after the dry heat treatment was measured before and after the treatment. JIS L-1013: 2010 Tensile strength Measured according to the constant speed extension type and calculated by the following formula (II).
K: Strength retention (%) = (G / M) × 100 (II)
G: Strength after dry heat treatment (cN / dtex), M: Strength before dry heat treatment (cN / dtex)

  When the strength retention is 60% or more, the obtained warp knitted fabric has excellent absolute strength, and particularly excellent durability when used for industrial materials, secondary materials, filters, and the like. It is easy to become a thing.

  The warp knitted fabric of the present invention is a yarn composed of non-heat-fusible polyester fibers having a single yarn fineness of 2.0 dtex or more and a melting point of 30 ° C. or more higher than that of the polyester B together with the composite fiber yarn (hereinafter referred to as “the yarn”). , Which may be abbreviated as non-heat-bondable polyester fiber yarn).

  When the composite fiber yarn and the non-heat-sealable polyester fiber yarn are knitted, it is advantageous in terms of cost compared to the case where the composite fiber yarn is knitted only. When the single yarn fineness of the non-heat-bondable polyester fiber yarn is less than 2 dtex, the warp knitted fabric obtained by knitting and heat-treating the non-heat-bondable polyester fiber yarn and the composite fiber yarn has a desired rigidity. It may be difficult to obtain. Further, if the single yarn fineness is 50 dtex or less, it is preferable because the thickness of the warp knitted fabric is likely to be thin.

  In the present invention, the non-heat-bondable polyester fiber preferably has a single yarn fineness of 2 dtex or more, and preferably has a melting point higher than the melting point of the polyester B of the core-sheath type composite fiber constituting the composite fiber yarn. It is not particularly limited as long as it is 30 ° C. or higher. The cross-sectional shape of the non-heat-fusible polyester fiber is not particularly limited. When the non-heat-bondable polyester fiber is composed of two or more types of polyester components, such as when the cross-sectional shape is a core-sheath type or a side-by-side type, the melting point of the lowest melting component of the two or more types of polyester components is What is necessary is just to be 30 degreeC or more higher than melting | fusing point of polyester B of the core-sheath type composite fiber which comprises a composite fiber yarn.

  The polyester constituting the non-heat-bondable polyester fiber yarn is not particularly limited, and may be a homopolymer, a copolymer, or a blend polymer. In the case of PET having an ethylene terephthalate unit of 95 mol% or more in all repeating units, the warp knitted fabric is excellent in thermal stability, which is preferable.

  The form of the non-heat-fusible polyester fiber yarn is not particularly limited, such as multifilament, monofilament, spun yarn and the like. Moreover, arbitrary processes, such as false twisting and interlaced blending with other yarns, can be performed.

  The warp knitted fabric of the present invention has a knitted structure in which composite fiber yarns are alternately knitted on the left and right sides with a swing width of 1 to 4 wales per course (hereinafter referred to as a knitted structure (1 )).

The warp knitted fabric of the present invention is excellent in rigidity in both the course direction and the wale direction of the warp knitted fabric by knitting the composite fiber yarn into the above knitted structure and heat-treating it.

  In the present invention, when the knitting structure is a knitting structure knitted with a swing width of 0 wales per course, that is, a chain knitting structure, the warp knitted fabric is inferior in rigidity in the wale direction. Further, when the knitting structure is a knitting structure knitted with a swing width exceeding 4 wales per course, it is difficult to make the warp knitted fabric have a desired thickness.

  In addition, when the knitting structure is not knitted alternately for each course, for example in the case of a single atlas knitting structure, the warp knitted fabric is inferior in the rigidity in the course direction.

  The knitting structure (1) composed of the composite fiber yarn includes, in addition to the knitting structure in which a loop is formed by the composite fiber yarn knitting the knitting structure, the knitting structure having the composite fiber yarn knitting the knitting structure as an inlay, Or it can be set as the knitting organization which combined these. If the knitted structure is made of a loop, the warp knitted fabric will be more rigid. When the loop is closed, the warp knitted fabric is particularly excellent in rigidity.

  Examples of the knitting structure in which the loop is formed include a single denby knitting, a single cord knitting, a single satin knitting, and a single velvet knitting.

  The warp knitted fabric of the present invention may be a combination of a plurality of knitting structures in which the loop is formed, and a combination of other knitting structures such as a chain knitting structure, a single atlas knitting structure, and an inlay in the knitting structure in which the loop is formed. It is also good. Examples of the knitting structure obtained by the combination include a double denvi knitting, a double cord knitting, a half tricot knitting, a reverse half, a queen's cord knitting, a satin tricot knitting, and a velvet knitting.

  Moreover, when knitting the knitting structure (1) composed of the composite fiber yarn, the composite fiber yarn knitting the knitting structure may be a half set in which, for example, every other warp is passed through the knitting needle. From the viewpoint of the rigidity of the warp knitted fabric, the composite fiber yarn is preferably a full set that performs warp threading commensurate with the number of knitting needles.

  The warp knitted fabric of the present invention may be knitted with fibers other than the composite fiber yarn within the scope of the object of the present invention. Although it does not specifically limit as this other fiber, It is preferable that it is the non-heat-fusion-bonding polyester fiber thread mentioned above.

  When knitting with other fibers, the warp knitted fabric of the present invention preferably contains 40% by mass or more and more preferably 50% by mass or more of the composite fiber yarn with respect to the entire warp knitted fabric. When the mixed rate of the composite fiber yarn is 40% by mass or more, the warp knitted fabric tends to have excellent rigidity.

  The warp knitted fabric of the present invention has a knitted structure in which composite fiber yarns are alternately knitted on the left and right sides with a swing width of 2 to 4 wales per course (hereinafter referred to as a knitted structure (2 ) And the non-heat-fusible polyester fiber yarn is 1 wal or more per course, and the waving width is 1 wal or less than the waving width of the composite fiber yarn. It may be composed of a knitted structure knitted alternately on the left and right sides (hereinafter sometimes abbreviated as a knitted structure composed of non-heat-fusible polyester fiber yarns).

  By using the knitted structure, the warp knitted fabric can have a desired rigidity while being thin, and at the same time, it is advantageous in terms of cost.

  When the knitted structure made of non-heat-bondable polyester fiber yarns is a knitted structure knitted with a swing width of 0 wales per course, that is, a chain knitted structure, the warp knitted fabric is inferior in rigidity. Cheap. Further, the warp knitting width of the knitting structure made of the non-heat-bondable polyester fiber yarn is 1 warp or less than that of the knitting structure (2) made of the composite fiber yarn. The ground can be made thin while having excellent rigidity.

  Accordingly, when the knitting structure (2) made of the composite fiber yarn is combined with the knitting structure made of the non-heat-bondable polyester fiber yarn, the knitting structure is alternately knitted on the left and right sides with a swing width of at least 2 wales per course. It is preferable that the knitted structure is formed. Further, as described above, when the knitting structure (2) composed of the composite fiber yarn is knitted with a swing width exceeding 4 courses per course, the warp knitted fabric is thin. It becomes difficult.

  The knitted structure comprising the non-heat-bondable polyester fiber yarn includes a knitted structure in which a loop is formed by the non-heat-bondable polyester fiber yarn knitting the knitted structure, and a polyester fiber yarn knitting the knitted structure. Can be made into an inlay or a combination of these. The knitting structure can be a half set.

  In the warp knitted fabric of the present invention, it is preferable that the number of reeds when knitting the warp knitted fabric is 2 to 4 reeds. As the number of warps increases, the warp knitted fabric obtained becomes stiffer and stronger, while the thickness of the warp knitted fabric also increases. The object of the present invention is to obtain a warp knitted fabric having sufficient rigidity while having a small thickness, and in order to obtain a warp knitted fabric having a small thickness, the range of 2 to 3 is most preferable. It is.

The warp knitted fabric of the present invention has a warp knitted fabric density (/(2.54 cm) represented by the product of the course density (the number of courses / 2.54 cm) and the wale density (the number of wales / 2.54 cm) of the warp knitted fabric. ) 2 ) must be 1200 (/(2.54 cm) 2 ) or more, and preferably 1500 (/(2.54 cm) 2 ) or more. When the warp knitted fabric density is less than 1200 (/(2.54 cm) 2 ), the warp knitted fabric after heat treatment has low rigidity and is bent with a little force.

  However, in the present invention, the course density and the wale density are calculated in a section of 2.54 cm in accordance with the density of JIS L 1096: 2010 8.6.2 knitted fabric.

  The warp knitted fabric of the present invention needs to have a thickness of 1 mm or less, preferably 0.7 mm or less, and more preferably 0.5 mm or less. By setting the thickness to 1 mm or less, it can be used for applications requiring a thin warp knitted fabric such as filters and clothing. Setting the thickness to a desired value means that the dry fiber dimensional change rate of the composite fiber yarn, the composite fiber yarn and / or the non-heat-bondable polyester fiber yarn are within the range in which the desired rigidity can be obtained. This can be achieved by appropriately adjusting the fineness, the swing width of the composite fiber yarn and / or the non-heat-bondable polyester fiber yarn, the number of wrinkles, the knitting structure, the warp knitted fabric density, the heat treatment conditions, and the like.

  In the warp knitted fabric of the present invention, the warp and softness in the wale direction and the course direction of the warp knitted fabric both need to be 7 cm or more, and preferably 10 cm or more.

  In the present invention, the bending resistance is measured according to the JIS L 1096: 2010 A method (45 ° cantilever method), and the bending resistance in the wale direction and the course direction are calculated separately.

  When the bending resistance of at least one of the wale direction and the course direction of the warp knitted fabric is less than 7 cm, the warp knitted fabric is inferior in shape retention, and quickly loses its shape due to a slight external force.

  The warp knitted fabric of the present invention can be obtained by heat-treating a warp knitted fabric knitted with composite fiber yarn at a temperature equal to or higher than the melting point of polyester B. The heat treatment method is particularly effective when the polyester B is melted and the composite fiber yarns constituting the warp knitted fabric or the composite fiber yarns and other fibers knitted together with the composite fiber yarns are heat-sealed. It is not limited and can be performed using, for example, a tenter as a processing machine. The heat treatment conditions are not particularly limited, but, for example, if heat treatment is performed for 30 seconds or more at the melting point of polyester B + 10 ° C., the warp knitted fabric tends to have high strength, heat shrinkage is suppressed, and the thickness is increased. The warp knitted fabric is preferable because it can be suppressed and is sufficiently heat-sealed by the composite fiber yarn.

  Whether or not it is heat-sealed, it is only necessary to take a warp knitted fabric surface photograph from the surface of the warp knitted fabric, check the melted state of the composite fiber yarn in the present invention, warp knitted fabric It is preferable that at least 70% or more of the composite fiber yarn that can be confirmed from the surface is fused.

  Next, the present invention will be described specifically by way of examples. In addition, measurement and evaluation of various values in the examples were performed as follows.

  Melting | fusing point (degreeC) of polyester A and polyester B: It measured with the temperature increase rate of 20 degree-C / min using Perkin-Elmer DSC-2 type | mold (differential scanning calorimeter).

  Dry heat dimensional change rate (%) of composite fiber yarn: measured and calculated according to the method described above.

Warp knitted fabric density (/(2.54 cm) 2 ): JIS L 1096: 2010 8.6.2 The course density and the wale density in a section of 2.54 cm were calculated according to the density of the knitted fabric, and the course density (number of courses / 2.54 cm) and the wale density (number of wales / 2.54 cm).

  Thickness of warp knitted fabric: JIS L 1096: 2010 8.4 Measured and calculated according to thickness A method. In the present invention, those having a diameter of 1 mm or less were accepted.

  Bending softness of warp knitted fabric: measured according to JIS L 1096: 2010 A method (45 ° cantilever method), and bending resistance in the wale direction and course direction were calculated separately. In the present invention, those having a bending resistance of 7 cm or more in both the wale direction and the course direction were regarded as acceptable.

Example 1
Among the polyesters constituting the core-sheath type composite fiber, the polyester A uses PET having a melting point of 257 ° C., in which the ethylene terephthalate unit is 95 mol% in all repeating units, and the polyester B is mainly composed of the ethylene terephthalate unit and contains all glycol components. Polyester having a melting point of 181 ° C. obtained by copolymerizing 50 mol% of 1,4-butanediol was used. The polyester A is placed in the core, the polyester B is placed in the sheath, and the core-sheath mass ratio (core / sheath) is 7/3. Melt spinning / drawing was performed to obtain a composite fiber yarn of 56 dtex 24 filaments. The melting points of polyester A and polyester B and the dry heat dimensional change rate of the composite fiber yarn were measured using the yarn.

  Next, a KARL MAYER tricot knitting machine KS 28G was used as the knitting machine, the number of folds was set to 2 and the composite fiber yarn was passed through the front and back folds in a full set. Then, as shown in FIG. 1, a composite fabric knitted alternately left and right with a swing width of 2 wales for each course is knitted by a composite fiber yarn passed through the front heel, and passed through the back heel A chain structure was knitted with fiber yarns to obtain a warp knitted fabric.

The obtained warp knitted fabric was scoured with a surfactant “Sunmol FL: 1 g / l” using a liquid dyeing machine manufactured by Hisaka, and then at 200 ° C. using VIC-TEX made by Ichikin Kogyo. Heat set at a speed of 30 m / min for 1 minute, course density 40.0 course / 2.54 cm, wale density 38.0 wale / 2.54 cm, warp knitted fabric density 1520 (/(2.54 cm) 2 ) The warp knitted fabric of the present invention was obtained. The warp knitted fabric density, thickness, and bending resistance were measured using the warp knitted fabric.

Example 2
Among the polyesters constituting the core-sheath type composite fiber, the polyester A uses PET having a melting point of 257 ° C., in which the ethylene terephthalate unit is 95 mol% in all repeating units, and the polyester B is mainly composed of the ethylene terephthalate unit and contains all glycol components. Polyester having a melting point of 181 ° C. obtained by copolymerizing 50 mol% of 1,4-butanediol was used. The polyester A is placed in the core, the polyester B is placed in the sheath, and the core-sheath mass ratio (core / sheath) is 7/3. Melt spinning and drawing were performed to obtain a composite fiber yarn of 110 dtex 24 filaments. The melting points of polyester A and polyester B and the dry heat dimensional change rate of the composite fiber yarn were measured using the yarn. Polyester fiber yarn having a melting point of 256 ° C. and a single yarn fineness of 2.3 dtex as a non-heat-bondable polyester fiber yarn (manufactured by Unitika Trading Co., Ltd., PET in which ethylene terephthalate units are 95 mol% in all repeating units) 84 dtex 36 filament was used.

  The polyester fiber yarn is passed through the back heel with a full set, and the composite fiber yarn is passed through the front heel with a full set. As shown in FIG. A knitted structure knitted alternately in the left and right directions with a wrinkle width of 2 wales was knitted, and a chain knitted structure was knitted with polyester fiber yarns passed through the back ridge to obtain a warp knitted fabric.

The obtained warp knitted fabric was scoured with a surfactant “Sunmol FL: 1 g / l” using a liquid dyeing machine manufactured by Hisaka, and then at 200 ° C. using VIC-TEX made by Ichikin Kogyo. Heat set at a speed of 30 m / min for 1 minute, course density 40.0 course / 2.54 cm, wale density 38.0 wale / 2.54 cm, warp knitted fabric density 1520 (/(2.54 cm) 2 ) The warp knitted fabric of the present invention was obtained. The warp knitted fabric density, thickness, and bending resistance were measured using the warp knitted fabric.

Example 3
The composite fiber yarn used in Example 1 was used, a KARL MAYER tricot knitting machine KS 28G was used as the knitting machine, the number of rivets was four, and the first to fourth ridges were fully filled with the composite fiber yarn. As shown in FIG. 2, the composite fiber yarns passed through the first and second ridges are knitted alternately with left and right swinging widths of 2 wales for each course, as shown in FIG. The composite fiber yarns passed through 2 ridges knit a knitting structure (double cord knitting structure) in opposite directions, and 1 wal per course by the composite fiber yarns passed through the 3rd and 4th ridges A knitted structure (double denbi knitted structure) was knitted alternately with left and right swinging widths and the composite fiber yarns passed through the third and fourth ridges in opposite directions to obtain a warp knitted fabric .

The obtained warp knitted fabric was scoured with a surfactant “Sunmol FL: 1 g / l” using a liquid dyeing machine manufactured by Hisaka, and then at 200 ° C. using VIC-TEX made by Ichikin Kogyo. Heat set at a speed of 30 m / min for 1 minute, course density 36.9 course / 2.54 cm, wale density 33.0 wale / 2.54 cm, warp knitted fabric density 1218 (/(2.54 cm) 2 ) The warp knitted fabric of the present invention was obtained. The warp knitted fabric density, thickness, and bending resistance were measured using the warp knitted fabric.

Example 4
A polyester monofilament having a fineness of 22 dtex as a non-heat-bondable polyester fiber yarn (PET whose ethylene terephthalate unit is 95 mol% in all repeating units), using the composite fiber yarn used in Example 2 as the composite fiber yarn. ) Was used. A KARL MAYER tricot knitting machine KS 28G is used as the knitting machine, the number of ridges is four, the composite fiber yarn is passed through the first and second ridges in a full set, and the third and fourth ridges are A full set of polyester monofilament was passed. As shown in FIG. 2, the first and second folds are knitted alternately by the composite fiber yarns passed through the first and second ridges with a wrinkle width of 2 wales per course. A knitting structure (double cord knitting structure) in which the composite fiber yarns passed in the opposite directions are knitted, and the polyester monofilament passed through the third and fourth ridges has a one-wafer swing width per course. In this way, a knitted structure (double denbi knitted structure) in which the polyester monofilaments knitted alternately in the left and right directions and passed through the third and fourth ridges are opposite to each other was knitted to obtain a warp knitted fabric.

The obtained warp knitted fabric was scoured with a surfactant “Sunmol FL: 1 g / l” using a liquid dyeing machine manufactured by Hisaka, and then at 200 ° C. using VIC-TEX made by Ichikin Kogyo. Heat set at a speed of 30 m / min for 1 minute, course density 36.9 course / 2.54 cm, wale density 33.0 wale / 2.54 cm, warp knitted fabric density 1218 (/(2.54 cm) 2 ) The warp knitted fabric of the present invention was obtained. The warp knitted fabric density, thickness, and bending resistance were measured using the warp knitted fabric.

Example 5
The composite fiber yarn used in Example 1 was used as the composite fiber yarn, the KARL MAYER tricot knitting machine KS 28G was used as the knitting machine, the number of the reeds was two, and the composite fiber yarn was used for the front and back reeds. Threaded the full set. Then, as shown in FIG. 1, a composite fabric knitted alternately left and right with a swing width of 2 wales for each course is knitted by a composite fiber yarn passed through the front heel, and passed through the back heel A chain structure was knitted with fiber yarns to obtain a warp knitted fabric.

The obtained warp knitted fabric was scoured with a surfactant “Sunmol FL: 1 g / l” using a liquid dyeing machine manufactured by Hisaka, and then at 200 ° C. using VIC-TEX made by Ichikin Kogyo. Heat setting is performed at a speed of 30 m / min for 1 minute, course density 38.0 course / 2.54 cm, wale density 33.0 wale / 2.54 cm, warp knitted fabric density 1254 (/(2.54 cm) 2 ) The warp knitted fabric of the present invention was obtained. The warp knitted fabric density, thickness, and bending resistance were measured using the warp knitted fabric.

Example 6
The composite fiber yarn used in Example 2 was used as the composite fiber yarn, and the polyester fiber yarn used in Example 2 was used as the non-heat-bondable polyester fiber yarn. The polyester fiber yarn is passed through the back heel with a full set, and the composite fiber yarn is passed through the front heel with a full set. As shown in FIG. A knitted structure knitted alternately in the left and right directions with a wrinkle width of 2 wales was knitted, and a chain knitted structure was knitted with polyester fiber yarns passed through the back ridge to obtain a warp knitted fabric.

The obtained warp knitted fabric was scoured with a surfactant “Sunmol FL: 1 g / l” using a liquid dyeing machine manufactured by Hisaka, and then at 200 ° C. using VIC-TEX made by Ichikin Kogyo. Heat setting is performed at a speed of 30 m / min for 1 minute, course density 38.0 course / 2.54 cm, wale density 33.0 wale / 2.54 cm, warp knitted fabric density 1254 (/(2.54 cm) 2 ) The warp knitted fabric of the present invention was obtained. The warp knitted fabric density, thickness, and bending resistance were measured using the warp knitted fabric.

Comparative Example 1
A PET filament yarn (56 dtex 24 filament) having an ethylene terephthalate unit of 95 mol% in all repeating units and a melting point of 256 ° C. is used, and a KARL MAYER tricot knitting machine KS 28G is used as the knitting machine. The PET filament yarn was passed through the front and back folds in a full set. Then, as shown in FIG. 1, a knitted structure knitted alternately left and right with a wrinkle width of 2 wales for each course is knitted by the PET filament yarn passed through the front ridge, and the PET filament passed through the back ridge A chain structure was knitted with yarn to obtain a warp knitted fabric. That is, in Example 1, PET filament yarn was used instead of the composite fiber yarn.

The obtained warp knitted fabric was scoured with a surfactant “Sunmol FL: 1 g / l” using a liquid dyeing machine manufactured by Hisaka, and then at 200 ° C. using VIC-TEX made by Ichikin Kogyo. Heat setting was performed at a speed of 30 m / min for 1 minute, course density 40.0 course / 2.54 cm, wale density 33.0 wale / 2.54 cm, warp knitted fabric density 1320 (/(2.54 cm) 2 ) A warp knitted fabric for comparison was obtained. The warp knitted fabric density, thickness, and bending resistance were measured using the warp knitted fabric.

Comparative Example 2
Among the polyesters constituting the core-sheath type composite fiber, the polyester A uses PET having a melting point of 257 ° C., in which the ethylene terephthalate unit is 95 mol% in all repeating units, and the polyester B is mainly composed of the ethylene terephthalate unit and contains all glycol components. Polyester having a melting point of 181 ° C. obtained by copolymerizing 50 mol% of 1,4-butanediol was used. The polyester A is placed in the core, the polyester B is placed in the sheath, and the core-sheath mass ratio (core / sheath) is 3/7. Melt spinning / drawing was performed to obtain a composite fiber yarn of 56 dtex 24 filaments. The melting points of polyester A and polyester B and the dry heat dimensional change rate of the composite fiber yarn were measured using the yarn.

  Next, a KARL MAYER tricot knitting machine KS 28G was used as the knitting machine, the number of folds was set to 2 and the composite fiber yarn was passed through the front and back folds in a full set. Then, as shown in FIG. 1, a composite fabric knitted alternately left and right with a swing width of 2 wales for each course is knitted by a composite fiber yarn passed through the front heel, and passed through the back heel A chain structure was knitted with fiber yarns to obtain a warp knitted fabric.

The obtained warp knitted fabric was scoured with a surfactant “Sunmol FL: 1 g / l” using a liquid dyeing machine manufactured by Hisaka, and then at 200 ° C. using VIC-TEX made by Ichikin Kogyo. Heat set at a speed of 30 m / min for 1 minute, course density 40.0 course / 2.54 cm, wale density 34.0 wale / 2.54 cm, warp knitted fabric density 1360 (/(2.54 cm) 2 ) A warp knitted fabric for comparison was obtained. The warp knitted fabric density, thickness, and bending resistance were measured using the warp knitted fabric.

Comparative Example 3
Among the polyesters constituting the core-sheath type composite fiber, the polyester A uses PET having a melting point of 257 ° C., in which the ethylene terephthalate unit is 95 mol% in all repeating units, and the polyester B is mainly composed of the ethylene terephthalate unit and contains all glycol components. Polyester having a melting point of 181 ° C. obtained by copolymerizing 50 mol% of 1,4-butanediol was used. The polyester A is placed in the core, the polyester B is placed in the sheath, and the core-sheath mass ratio (core / sheath) is 3/7. Melt spinning and drawing were performed to obtain a composite fiber yarn of 110 dtex 24 filaments. The melting points of polyester A and polyester B and the dry heat dimensional change rate of the composite fiber yarn were measured using the yarn. Polyester fiber yarn having a melting point of 256 ° C. and a single yarn fineness of 2.3 dtex as a non-heat-bondable polyester fiber yarn (manufactured by Unitika Trading Co., Ltd., PET in which ethylene terephthalate units are 95 mol% in all repeating units) 84 dtex 36 filament was used.

  The polyester fiber yarn is passed through the back heel with a full set, and the composite fiber yarn is passed through the front heel with a full set. As shown in FIG. A knitted structure knitted alternately in the left and right directions with a wrinkle width of 2 wales was knitted, and a chain knitted structure was knitted with polyester fiber yarns passed through the back ridge to obtain a warp knitted fabric.

The obtained warp knitted fabric was scoured with a surfactant “Sunmol FL: 1 g / l” using a liquid dyeing machine manufactured by Hisaka, and then at 200 ° C. using VIC-TEX made by Ichikin Kogyo. Heat set at a speed of 30 m / min for 1 minute, course density 40.0 course / 2.54 cm, wale density 34.0 wale / 2.54 cm, warp knitted fabric density 1360 (/(2.54 cm) 2 ) A warp knitted fabric for comparison was obtained. The warp knitted fabric density, thickness, and bending resistance were measured using the warp knitted fabric.

Comparative Example 4
The composite fiber yarn used in Example 1 was used as the composite fiber yarn, the KARL MAYER tricot knitting machine KS 24G was used as the knitting machine, the number of reeds was two, and the composite fiber yarn was used for the front and back reeds. Threaded the full set. Then, as shown in FIG. 1, a composite fabric knitted alternately left and right with a swing width of 2 wales for each course is knitted by a composite fiber yarn passed through the front heel, and passed through the back heel A chain structure was knitted with fiber yarns to obtain a warp knitted fabric.

The obtained warp knitted fabric was scoured with a surfactant “Sunmol FL: 1 g / l” using a liquid dyeing machine manufactured by Hisaka, and then at 200 ° C. using VIC-TEX made by Ichikin Kogyo. Heat set for 1 minute at a speed of 30 m / min, course density 31.1 course / 2.54 cm, wale density 28.0 wale / 2.54 cm, warp knitted fabric density 871 (/(2.54 cm) 2 ) A warp knitted fabric for comparison was obtained. The warp knitted fabric density, thickness, and bending resistance were measured using the warp knitted fabric.

Comparative Example 5
The composite fiber yarn used in Example 2 was used as the composite fiber yarn, and the polyester fiber yarn used in Example 2 was used as the non-heat-bondable polyester fiber yarn. Using a KARL MAYER tricot knitting machine KS 24G as the knitting machine, the number of reeds is 2 reeds, the polyester fiber yarn is passed through the back reed as a full set, and the composite fiber yarn is passed as a full set through the front reed, As shown in FIG. 1, a polyester fiber yarn that is knitted in a knitted structure that is alternately knitted with a two-wales swing width for each course by a composite fiber yarn passed through the front heel and passed through the back heel A chain structure was knitted by the strip to obtain a warp knitted fabric.

The obtained warp knitted fabric was scoured with a surfactant “Sunmol FL: 1 g / l” using a liquid dyeing machine manufactured by Hisaka, and then at 200 ° C. using VIC-TEX made by Ichikin Kogyo. Heat set for 1 minute at a speed of 30 m / min, course density 31.1 course / 2.54 cm, wale density 28.0 wale / 2.54 cm, warp knitted fabric density 871 (/(2.54 cm) 2 ) A warp knitted fabric for comparison was obtained. The warp knitted fabric density, thickness, and bending resistance were measured using the warp knitted fabric.

Comparative Example 6
The composite fiber yarn used in Example 1 was used, a KARL MAYER tricot knitting machine KS 28G was used as the knitting machine, the number of rivets was four, and the first to fourth ridges were fully filled with the composite fiber yarn. As shown in FIG. 3, the composite fiber yarns passed through the first and second folds are knitted as inlays alternately with left and right swinging widths of 4 wales per course, as shown in FIG. A knitting structure in which the composite fiber yarns passed through the second kite are opposite to each other is knitted, and a single-wafer swing width per course by the composite fiber yarns passed through the third and fourth kites In this way, a knitted structure (double denbi knitted structure) in which the composite fiber yarns knitted alternately on the left and right sides and passed through the third and fourth ridges are opposite to each other was knitted to obtain a warp knitted fabric.

The obtained warp knitted fabric was scoured with a surfactant “Sunmol FL: 1 g / l” using a liquid dyeing machine manufactured by Hisaka, and then at 200 ° C. using VIC-TEX made by Ichikin Kogyo. Heat set at a speed of 30 m / min for 1 minute, course density 43.2 course / 2.54 cm, wale density 40.0 wale / 2.54 cm, warp knitted fabric density 1728 (/(2.54 cm) 2 ) A warp knitted fabric for comparison was obtained. The warp knitted fabric density, thickness, and bending resistance were measured using the warp knitted fabric.

Comparative Example 7
The composite fiber yarn used in Example 2 was used as the composite fiber yarn, and the polyester fiber yarn used in Example 2 was used as the non-heat-bondable polyester fiber yarn. A KARL MAYER tricot knitting machine KS 28G is used as the knitting machine, the number of ridges is four, the composite fiber yarn is passed through the first and second ridges in a full set, and the third and fourth ridges are A full set of polyester fiber yarn was passed. As shown in FIG. 3, the composite fiber yarns passed through the first and second folds are knitted as inlays alternately with left and right swinging widths of 4 wales per course, and the first and second The composite fiber yarns passed through the ridges are knitted in opposite directions, and the polyester fiber yarns passed through the third and fourth ridges are alternately left and right with a swing width of 1 wal per course. A warp knitted fabric was obtained by knitting a knitted structure (double denbi knitted structure) in which the polyester fiber yarns knitted and passed through the third and fourth ridges were in opposite directions.

The obtained warp knitted fabric was scoured with a surfactant “Sunmol FL: 1 g / l” using a liquid dyeing machine manufactured by Hisaka, and then at 200 ° C. using VIC-TEX made by Ichikin Kogyo. Heat set at a speed of 30 m / min for 1 minute, course density 43.2 course / 2.54 cm, wale density 40.0 wale / 2.54 cm, warp knitted fabric density 1728 (/(2.54 cm) 2 ) A warp knitted fabric for comparison was obtained. The warp knitted fabric density, thickness, and bending resistance were measured using the warp knitted fabric.

  The obtained results are shown in Table 1.

The warp knitted fabrics of Examples 1 to 6 had a thickness of 1 mm or less, and the bending resistance of the warp knitted fabric in the course direction and the wale direction were both 7 cm or more. Therefore, a warp knitted fabric having a small thickness and excellent rigidity could be obtained. In particular, the warp knitted fabrics of Examples 1, 2, 5 and 6 were the number of knitted knitted warp knitted fabrics, the dry heat dimensional change rate of the composite fiber yarns, the fineness of the composite fiber yarns, and the non-heat-bonding polyester. Since the fineness of the fiber yarn, the content of the composite fiber yarn, the knitting structure and the warp knitted fabric density are appropriate, the thickness can be 0.5 mm or less while providing the desired bending resistance. It was. Among them, the warp knitted fabric of Example 1 has a composite fiber yarn content of 100% by mass and a warp knitted fabric density of 1500 (/(2.54 cm) 2 ), so that the thickness is 0.5 mm or less. In addition, the bending resistance of the warp knitted fabric in the course direction and the wale direction could be 10 cm or more.

On the other hand, since the warp knitted fabric of Comparative Example 1 did not use the composite fiber yarn, the heat-fusible property was poor, and the bending resistance of the warp knitted fabric in the course direction and the wale direction was less than 7 cm. The warp knitted fabrics of Comparative Examples 2, 3, 6 and 7 had a thickness exceeding 1 mm and did not satisfy the requirements of the present invention. The reason why the thickness exceeds 1 mm is that the fineness of the composite fiber yarn, the core-sheath mass ratio, the fineness of the non-heat-bondable polyester fiber yarn, the composite fiber yarn, and the non-heat-bondable polyester fiber yarn This is because the combination of the waving width, the warp knitted fabric structure, the warp knitted fabric density, the number of wrinkles, and the like was not appropriate for a thickness of 1 mm or less. Since the warp knitted fabrics of Comparative Examples 4 and 5 had a warp knitted fabric density of less than 1200 (/(2.54 cm) 2 ), the bending resistance of the warp knitted fabric in the course direction and the wale direction was less than 7 cm. became.

DESCRIPTION OF SYMBOLS 1 Knitting organization by front heel 2 Knitting organization by back heel 3 Knitting organization by 1st heel 4 Knitting organization by 2nd heel 5 Knitting organization by 3rd heel 6 Knitting organization by 4th heel

Claims (4)

A yarn comprising a core-sheath type composite fiber composed of two types of polyesters having different melting points, wherein the polyester having a high melting point is disposed in the core and the polyester having a low melting point is disposed in the sheath. A warp knitted fabric knitted by
The warp knitted fabric is composed of a knitted structure in which yarns composed of the core-sheath type composite fibers are knitted alternately on the left and right sides with a swing width of 1 to 4 wales per course,
The warp knitted fabric density (/(2.54 cm) 2 ) represented by the product of the course density of the warp knitted fabric (the number of courses / 2.54 cm) and the wale density (the number of wales / 2.54 cm) is 1200 (/ ( 2.54 cm) 2 ) or more,
The warp knitted fabric has a thickness of 1 mm or less,
The warp knitted fabric is characterized in that both the course softness and the wale softness of the warp knitted fabric are 7 cm or more.
A yarn comprising a core-sheath type composite fiber composed of two types of polyesters having different melting points, wherein the polyester having a high melting point is disposed in the core and the polyester having a low melting point is disposed in the sheath. And a warp knitted fabric knitted with yarns made of non-heat-bondable polyester fibers having a single yarn fineness of 2.0 dtex or more and a melting point of 30 ° C. higher than that of the low melting point polyester. And
The warp knitted fabric has a knitted structure in which yarns made of the core-sheath type composite fibers are knitted alternately in the left and right directions with a swing width of 2 wales to 4 wales per course, and yarns made of the polyester fibers. It consists of a knitted structure that is knitted alternately on the left and right with a swing width of 1 wale or more per course and 1 wale or less than the swing width of the core-sheath composite fiber,
The warp knitted fabric density (/(2.54 cm) 2 ) represented by the product of the course density of the warp knitted fabric (the number of courses / 2.54 cm) and the wale density (the number of wales / 2.54 cm) is 1200 (/ ( 2.54 cm) 2 ) or more,
The warp knitted fabric has a thickness of 1 mm or less,
The warp knitted fabric is characterized in that the warp and softness in the wale direction and the course direction of the warp knitted fabric are both 7 cm or more.
The polyester having a high melting point is a polyester having an alkylene terephthalate unit as a main component and a melting point of 220 ° C. or more, and the polyester having a low melting point is a polyester having a melting point lower by 30 ° C. or more than the polyester having a high melting point. ,
The warp knitted fabric according to claim 1 or 2, wherein the yarn comprising the core-sheath type composite fiber contains 40% by mass or more based on the entire warp knitted fabric.
  The polyester having a low melting point is a copolyester comprising a terephthalic acid component and an ethylene glycol component, and comprising at least one component of a 1,4-butanediol component, an aliphatic lactone component, and an adipic acid component. The warp knitted fabric according to any one of claims 1 to 3.
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