JP2007063680A - Circular knitted fabric for vehicular sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a circular knitted fabric for a vehicular sheet which is a circular knitted fabric for the vehicular sheet scarcely causing damage to stitches during sewing without deteriorating touch feeling or air permeability of the circular knitted fabric. <P>SOLUTION: The circular knitted fabric for the vehicular sheet is knitted by using a polyester fiber yarn composed of a polyester having ≥240°C melting point and a heat-bonding fiber yarn in which a thermoplastic resin having <240°C melting point is exposed to at least the fiber surface. The heat-bonding fiber yarn is then subjected to a fusing treatment by heating. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a circular knitted fabric for vehicle seats, and relates to a circular knitted fabric for vehicle seats that is less likely to damage stitches during sewing without impairing the texture and breathability of the circular knitted fabric.

  In the conventional circular knitted fabric for vehicle seats, there is a problem (so-called “run”) in which the stitches fall off with the needle hole as a base point because the sewing conditions are severe during sewing. As a method for preventing such stitch damage, it has been proposed to apply a resin coating to the surface of a circular knitted fabric (see, for example, Patent Document 1). However, such resin coating has a problem that the texture of the circular knitted fabric is hardened and the air permeability is impaired.

Patent Document 2 discloses a “run” that occurs during sewing by using a heat-sealing yarn as a yarn constituting a circular knitted fabric and fixing the stitch by heat-sealing the heat-sealing yarn. Preventing is disclosed. However, when a circular knitted fabric is constituted only by the heat fusion yarn and the heat fusion yarn is heated and fused, there is a problem that the texture of the circular knitted fabric becomes hard.
On the other hand, as a vehicle seat fabric, it is known that a composite yarn including a heat fusion yarn is included in the fabric and the heat fusion yarn is subjected to a fusion treatment in order to prevent yarn breakage and yarn dropout. (For example, refer to Patent Document 3).

JP-A-6-220750 Japanese Patent Application Laid-Open No. 11-247054 JP 2001-316953 A

  The present invention has been made in view of the above-described background, and an object of the present invention is a circular knitted fabric for vehicle seats, in which the stitches are damaged during sewing without impairing the texture and air permeability of the circular knitted fabric. It is to provide a circular knitted fabric for vehicle seats that is difficult.

  As a result of intensive studies to achieve the above object, the present inventors have constituted a circular knitted fabric for vehicle seats with a polyester fiber yarn having a predetermined melting point and a heat-adhesive fiber yarn, and the heat-adhesive fiber yarn. We have found that a circular knitted fabric for vehicle seats that is less likely to cause damage to the stitches during sewing can be obtained by fusing only the strips without damaging the texture and breathability of the circular knitted fabric, and further investigations have been made. The present invention was conceived by repeating the process.

  Thus, according to the present invention, “a circular knitted fabric for vehicle seats, a polyester fiber yarn made of polyester having a melting point of 240 ° C. or higher, and a thermoplastic resin having a melting point of less than 240 ° C. exposed at least on the fiber surface. There is provided a circular knitted fabric for vehicle seats, characterized in that it is composed of adhesive fiber yarns, and the above-mentioned heat-adhesive fiber yarns are fusion-bonded by heating.

  In that case, it is preferable that the said thermoplastic resin is any one selected from the group which consists of a polyamide-type resin, copolyester, a polypropylene, and polyethylene. Moreover, it is preferable that the circular knitted fabric has a two-layer structure, and the heat-adhesive fiber yarn is included in only one of the two layers. Moreover, it is preferable that the heat-adhesive fiber yarn is included in the circular knitted fabric as an aligned yarn with the polyester fiber yarn. Furthermore, it is preferable that the weight ratio of the heat-adhesive fiber yarn and the polyester fiber yarn is in the range of 1:99 to 50:50 in the former: the latter.

  ADVANTAGE OF THE INVENTION According to this invention, it is a circular knitted fabric for vehicle seats, Comprising: The circular knitted fabric for vehicle seats which does not generate | occur | produce the damage of a stitch at the time of sewing is provided, without the texture and air permeability of a circular knitted fabric being impaired.

Hereinafter, embodiments of the present invention will be described in detail.
The circular knitted fabric for vehicle seat according to the present invention includes a polyester fiber yarn made of polyester having a melting point of 240 ° C. or higher, and a heat-bonding fiber yarn having a thermoplastic resin having a melting point of less than 240 ° C. exposed at least on the fiber surface. Composed.

  Here, as a polyester having a melting point of 240 ° C. or higher, terephthalic acid is a main acid component, and alkylene glycol having 2 to 6 carbon atoms, that is, ethylene glycol, trimethylene glycol, tetramethylene glycol, pentamethylene glycol, hexamethylene glycol. Examples include polyesters having at least one glycol selected from the group consisting of ethylene glycol as a main glycol component, particularly preferably ethylene glycol. Such a polyester may have a small amount (usually 30 mol% or less) of a copolymer component as required.

  For example, in the case of polyethylene terephthalate, terephthalic acid and ethylene glycol are directly esterified, or a lower alkyl ester of terephthalic acid such as dimethyl terephthalate is transesterified with ethylene glycol, or terephthalic acid and ethylene oxide are used. And the first stage reaction to produce a glycol ester of terephthalic acid and / or its low polymer, and the first stage reaction product is heated under reduced pressure until the desired degree of polymerization is reached. It may be produced by a second stage reaction for condensation reaction. Further, recycled polyester may be used. Such regenerated polyester includes a regenerated polyester obtained by using PET bottles as a raw material, heated and melted or dissolved in a solvent to be pelletized, and again melt-spun, and a regenerated polyester obtained by chemical recycling.

  In addition, in the polyester, a matting agent, a fine pore forming agent, a cationic dyeing agent, a coloring prevention agent, a heat stabilizer, a flame retardant, a fluorescent whitening agent, a coloring agent, an antistatic agent, and a moisture absorption as necessary. You may add 1 type, or 2 or more types of an agent, an antibacterial agent, a negative ion generator.

  In the polyester yarn, the total fineness is preferably in the range of 30 to 1000 dtex. Moreover, it is preferable that the single fiber fineness is in the range of 0.1 to 5.0 dtex and the number of filaments is in the range of 30 to 300. The form of the yarn may be a short fiber or a long fiber (multifilament), but the latter is preferable. Such a long fiber may be subjected to normal false twist crimping. Furthermore, twisted yarn or air processing may be applied. The cross-sectional shape of the single yarn is not particularly limited, and may be not only a normal round shape but also a flat shape, a flat shape with a constriction, a triangular shape, a Y shape, a T shape, a U shape, and the like.

  On the other hand, the heat-adhesive fiber yarn is not particularly limited as long as a thermoplastic resin having a melting point of less than 240 ° C. is exposed at least on the fiber surface. However, a polyamide-based resin (for example, a joiner manufactured by Fuji Spinning Co., Ltd.) (Product name)), copolyester, polypropylene, polyethylene and the like are preferably exemplified.

  Such a thermo-adhesive fiber yarn may be a fiber composed solely of a thermoplastic resin having a melting point of less than 240 ° C., or a thermoplastic resin having a melting point of less than 240 ° C. is disposed in the sheath portion, May be a core-sheath type composite yarn in which the polyester is disposed, or a side-by-side composite yarn of a thermoplastic resin having a melting point of less than 240 ° C. and the polyester.

  Such a heat-adhesive fiber yarn is used after being subjected to a fusion treatment by heating, and therefore the total fineness is preferably smaller than the total fineness of the polyester fiber yarn. If the total fineness of the heat-adhesive fiber yarn is equal to or greater than the total fineness of the polyester fiber yarn, the texture of the circular knitted fabric for vehicle seats may become hard. The total fineness of the heat-bondable fiber yarn is preferably in the range of 30 to 300 dtex. The single fiber fineness is preferably in the range of 1 to 30 dtex and the number of filaments is in the range of 1 to 30. The form of the yarn may be a short fiber or a long fiber (multifilament), but the latter is preferable. Furthermore, twisted yarn or air processing may be applied. The cross-sectional shape of the single yarn is not particularly limited, and may be not only a normal round shape but also a flat shape, a flat shape with a constriction, a triangular shape, a Y shape, a T shape, a U shape, and the like.

  In the circular knitted fabric for vehicle seats of the present invention, it is important that the heat-adhesive fiber yarn is subjected to a fusion treatment by heating. Since the heat-adhesive fiber yarn is subjected to the fusion treatment, the problem that the stitches fall off from the hole of the needle as a base point during sewing is less likely to occur.

In the circular knitted fabric for vehicle seats of the present invention, the number of layers of the knitted fabric is not particularly limited, and may be a single layer or a multilayer of two or more layers. In particular, when the circular knitted fabric has a two-layer structure such as a kano child structure and only one of the two layers includes a heat-adhesive fiber yarn, the circular knitted fabric is thermally bonded when used as a vehicle seat. It is preferable that the surface touch of the circular knitted fabric is not impaired by disposing a layer that does not contain the conductive fiber yarn on the passenger side surface.
In addition, it is preferable that the heat-adhesive fiber yarn is contained in the circular knitted fabric as an aligned yarn with the polyester fiber yarn because the tear strength of the circular knitted fabric does not decrease.

  The weight ratio of the heat-adhesive fiber yarn and the polyester fiber yarn is preferably in the range of 1:99 to 50:50 in the former: latter. If the weight ratio of the heat-adhesive fiber yarn is smaller than the above range, the stitches may be easily damaged during sewing. On the contrary, if the weight ratio of the heat-bondable fiber yarn is larger than the above range, the texture of the circular knitted fabric may be hardened by the heat-bonded heat-bond fiber yarn.

The circular knitted fabric of the present invention can be produced by the following production method.
First, using an ordinary circular knitting machine, a polyester fiber yarn made of polyester having a melting point of 240 ° C. or higher, and a heat-bonding fiber yarn having a thermoplastic resin having a melting point of less than 240 ° C. exposed at least on the fiber surface. Use to knit circular knitted fabric. Next, after dyeing as necessary, the heat-resistant fiber yarns are subjected to a dry heat treatment (final set) at a temperature equal to or higher than the melting point of the thermoplastic resin and equal to or lower than the melting point of the polyester, and the heat-bonding fiber yarns are fused. The circular knitted fabric of the invention is obtained. At that time, the dry heat treatment time is preferably about 1 to 5 minutes.

For knitted circular knitted fabric, normal alkali weight loss processing, water absorption processing, water repellent processing, UV shielding or antistatic agent, antibacterial agent, deodorant, insect repellent, phosphorescent agent, retroreflective agent, negative ion generation Various processings that impart functions such as agents may be additionally applied.
The circular knitted fabric thus obtained is composed of the polyester fiber yarn and the heat-adhesive fiber yarn, and the heat-adhesive fiber yarn is fusion-bonded by heating. Is unlikely to occur. Moreover, since it is not necessary to apply resin coating (backing) to the surface of the circular knitted fabric, the texture and air permeability of the circular knitted fabric are not impaired.

EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated in detail, this invention is not limited at all by these. In addition, each physical property in an Example is measured with the following method.
Next, although the Example and comparative example of this invention are explained in full detail, this invention is not limited by these.

(1) Seam fatigue resistance Two specimens of 5cm x 60cm are piled up, the center of the short side is sewn at the center, and the machine is sewn under the following conditions with straight stitches. Was spread by hand and the number of pieces of ground yarn was counted. A case where the number of occurrences of ground thread breakage was 2 or less per 50 cm seam length was judged as “good seam fatigue resistance” and 2 or more as “bad seam fatigue resistance”.
(Equipment and materials)
Sewing machine: Sewing machine for main sewing Sewing needle: # 23 ball point Sewing thread: Polyester # 8
(Test pieces)
5cm x 60cm
(Sewing conditions)
Seam pitch: 5 ± 0.5mm
Rotation speed: 2000rpm

[Example 1]
14G, 30 inch circular knitting machine (JIL7 manufactured by Fukuhara Seiki Co., Ltd.), ordinary polyethylene terephthalate false twisted crimped yarn (manufactured by Teijin Fibers Ltd., total fineness 167 dtex / 30 fil, melting point 256 ° C.) Ordinary polyethylene terephthalate multifilament (manufactured by Teijin Fibers Ltd., total fineness 167 dtex / 30 fil, melting point 256 ° C.) and polyamide-based multifilament (Fujibo Co., Ltd. Joiner (trade name), 1 using a total fineness of 70 dtex / 5 fil and a melting point of 145 ° C., according to the knitting structure diagram of FIG. 1, the weight ratio of the knitted fabric circular knitted fabric (heat-adhesive fiber yarn and polyester fiber yarn is the former: latter 5:95). At that time, the yarn feeding order was as follows.
1: A: Polyethylene terephthalate false twisted crimped yarn 2: B: Polyethylene terephthalate multifilament yarn 3: C: Assortment of polyethylene terephthalate false twisted crimped yarn and polyamide multifilament 4: A: Polyethylene terephthalate false twisted crimp Yarn 5: A: Polyethylene terephthalate false twisted crimped yarn 6: C: Assortment of polyethylene terephthalate false twisted crimped yarn and polyamide multifilament 7: A: Polyethylene terephthalate false twisted crimped yarn 8: B: Polyethylene terephthalate multiplied yarn Filament yarn 9: C: Assortment of polyethylene terephthalate false twisted crimped yarn and polyamide multifilament 10: A: Polyethylene terephthalate false twisted crimped yarn 11: A: Polyethylene terephthalate false twisted crimped yarn 12: C: Polyethylene tele Tallates pull aligned with the false-twist crimped yarn and polyamide-based multi-filament

Next, the circular knitted fabric is subjected to high-pressure dyeing treatment at 130 ° C. for 30 minutes, and the final set is subjected to dry heat setting at 180 ° C. for 2 minutes to heat-bond polyamide-based multifilament (heat-bonding fiber yarn). did.
The circular knitted fabric thus obtained had good resistance to seam fatigue. Moreover, since it was not backing, the texture and breathability of the circular knitted fabric were not impaired.

[Comparative Example 1]
In Example 1, in place of polyamide-based multifilament, ordinary polyethylene terephthalate false twisted crimped yarn (manufactured by Teijin Fibers Ltd., total fineness 84 dtex / 36 fil, melting point 256 ° C.) was used in the same manner as in Example 1. did.
In the obtained circular knitted fabric, the seam fatigue resistance was poor.

  According to the present invention, there is provided a circular knitted fabric for vehicle seats, and the circular knitted fabric for vehicle seats is less likely to cause damage to stitches during sewing without impairing the texture and breathability of the circular knitted fabric. Industrial value is extremely large.

It is a figure which shows the knitting structure of the child structure | tissue which can be employ | adopted in the circular knitted fabric of this invention.

Claims (5)

  A circular knitted fabric for vehicle seats, comprising a polyester fiber yarn made of polyester having a melting point of 240 ° C. or higher and a heat-bonding fiber yarn having a thermoplastic resin having a melting point of less than 240 ° C. exposed at least on the fiber surface. A circular knitted fabric for vehicle seats, wherein the heat-adhesive fiber yarn is subjected to a fusion treatment by heating.   The circular knitted fabric for vehicle seats according to claim 1, wherein the thermoplastic resin is any one selected from the group consisting of a polyamide-based resin, a copolyester, polypropylene, and polyethylene.   The circular knitted fabric for vehicle seats according to claim 1 or 2, wherein the circular knitted fabric has a two-layer structure, and only one of the two layers includes the heat-adhesive fiber yarn.   The circular knitted fabric for vehicle seats according to any one of claims 1 to 3, wherein the thermally adhesive fiber yarn is included in the circular knitted fabric as an aligned yarn with a polyester fiber yarn.   The vehicle seat according to any one of claims 1 to 4, wherein a weight ratio of the heat-adhesive fiber yarn and the polyester fiber yarn is in a range of 1:99 to 50:50 in the former: the latter. Circular knitted fabric.

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