JP3396938B2 - Pile warp knitted fabric - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting pile using a polyester-based multifilament yarn for a pile portion.
The present invention relates to a pile warp knitted fabric. 2. Description of the Related Art A pile warp knitted fabric using a polyester-based multifilament yarn as a pile yarn is often used as an interior material for automobiles. This is high productivity when using polyester multifilament yarn for pile yarn,
This is because a beautiful velvet-like appearance can be obtained, but on the other hand, pile warp knitted fabrics using polyester multifilament yarn have fallen the pile because the color and gloss differ between the side and cross section of the filament. In this case, there has been a problem that a whitening defect in which the collapsed portion looks white and a white blur defect in which the pile looks white depending on the viewing direction appear. As a means for solving this problem, there is known a method in which a spun yarn of polyester staple is used instead of a multifilament yarn of polyester. The spun yarn has moderate yarn spots, the height of the fibers constituting the pile is uneven, and the end faces of the fibers are dispersed in the height direction, so that even if there is some hair falling, it will be inconspicuous, resulting in whitening Although the disadvantages are improved, the spun yarn needs to be set at a lower speed during warping and knitting compared to the multifilament yarn,
The cost increases, and a velvet-like appearance cannot be obtained. [0004] As a method using a polyester multifilament yarn, a polyester multifilament yarn dyeable only with an ordinary disperse dye and a modified polyester multifilament yarn dyeable with a basic dye are reduced to about 1/1. Warping and knitting at the same ratio and knitting, dyeing the obtained knitted fabric, giving a difference in dyeing density between the two types of polyester multifilament yarns, making the pile surface appear marbling and eliminating whitening defects and whitening defects There are ways to improve. However, this method has a problem in light resistance of the modified polyester multifilament yarn which can be dyed even with a basic dye, and does not provide a velvet-like appearance. [0005] In order to obtain a velvet-like pile warp knitted fabric using a polyester multifilament yarn, the filaments constituting the pile yarn must be appropriately bendable and have an upright shape. Is preferred. on the other hand,
In order to improve the whitening defect and the whitening defect, it is necessary to make the pile yarn difficult to fall down or to make it difficult to understand even if the pile yarn falls down. It is necessary to increase the second moment of area depending on the fineness and the cross-sectional shape of the material, but in this case, a velvet-like tactile feeling cannot be obtained. The present invention relates to a pile warp knitted fabric in which a cut pile is formed by using a polyester multifilament yarn as a pile yarn, a filament that gives the pile yarn a velvet-like feel and a filament that makes it difficult for the pile yarn to fall down. By mixing two types of filaments, the warp knitted fabric is prevented from falling down, whitening defects and whitening defects are improved, and the velvet-like appearance quality peculiar to the warp knitted fabric is maintained. It was done. [0007] The present invention relates to a pile warp knitted fabric in which a cut pile is formed by using a polyester-based multifilament yarn for at least a pile yarn among a pile yarn and a ground yarn. The above pile yarn is fineness 0.3 ~
2. 1.5 denier, relatively thin low-shrinkage polyester filaments having a crimp count of 0.5 / cm or less and an elastic modulus of 650 kg / mm ² or more after being freely shrunk with boiling water;
0 to 12.0 denier, a mixture of a relatively thick high-shrinkable polyester filament having a crimp number of 3.0 to 30 / cm after being freely shrunk with boiling water and a shrinkage ratio of boiling water of 20% or more. It is a pile warp knitted fabric characterized by the following. The polyester-based multifilament yarn is a bundle of a large number of filaments composed of a homopolymer of polyethylene terephthalate or a copolymer containing polyethylene terephthalate as a main component and isophthalate and other components as a third component. Further, the polyester-based filament may be a side-by-side type or eccentric seascore type conjugate fiber composed of two polymers having different degrees of polymerization. Further, the cross-sectional shape of the filament may be any of a circular or a flat cross section. The boiling water shrinkage of the relatively thin, low-shrinkage polyester filament is determined by the fact that a relatively thick polyester filament in the pile shrinks at the time of dyeing a pile warp knitted fabric, and the relatively thin polyester filament comprises the relatively thin polyester filament. It is preferable that the length be 10% or more shorter than the length of the pile. In other words, the boiling water shrinkage of the above-mentioned thin low-shrinkage polyester filament is preferably 8.0% or less. In order to combine the relatively thin low-shrinkage polyester filament and the relatively thick high-shrinkage polyester filament into a pile yarn, a method of blending the above two types of multifilament yarns with high-pressure air is used. Any of a twisting method and a drawing method on a warper may be used, but by mixing with high-pressure air, particularly uniform mixing can be obtained. In addition, the mixing ratio of the above-mentioned thin low-shrinkage polyester filament and thick high-shrinkage polyester filament is preferably 40/60 to 80/20. The pile warp knitted fabric of the present invention uses the above-mentioned multifilament yarn as a pile yarn, and uses any synthetic fiber multifilament yarn such as a polyester multifilament yarn or its crimped yarn as a ground yarn. It is knitted on a warp knitting machine. The pile is made by brushing a loop of a knitted fabric knitted by a tricot machine with a needle cloth, cutting a surface of a loop formed by a POL sinker using a tricot machine, and a surface of a double knitted fabric knitted by a double Russell machine. The pile yarn connecting the knitted fabric and the back knitted fabric can be formed in the middle by a method such as cutting in the middle. However, the method using a POL sinker or the method using a double Russell machine causes an excessive force to be applied to the pile yarn during pile formation It is preferable in that there is no. The warp knitted fabric of the present invention is dyed after the formation of the pile, and is further finished into a product by aligning the pile ends with an emery roller, shaling or the like. The number of crimps after the relatively thin low-shrinkage polyester filament and the relatively thick high-shrinkage polyester filament are freely shrunk with boiling water is determined by dividing the sample into monofilaments having a length of about 20 cm. For 1 minute, and after drying, take a photograph magnified about 10 times to count the number of uneven portions, which is defined as the number of crimps. When the warp knitted fabric of the present invention is subjected to a dyeing finish,
The same heat action as when the pile yarn is treated with boiling water is applied to the pile yarn, and the heat causes the pile to shrink freely, and the thick high-shrinkage polyester filaments exhibit more crimps than the thin low-shrinkage polyester filaments. Shrink. Thus, the thin, low-shrinkage polyester filaments stand upright to form a high pile and emerge on the surface of the pile layer to provide a velvet-like appearance and feel. On the other hand, relatively thick high-shrinkage polyester filaments form a low pile, moderately developed crimps prevent the above-mentioned thin low-shrinkage polyester filaments from falling down, and when viewed from directly above the fiber, Works to improve the whitening defect and the whitening defect. When the fineness of the thin low-shrinkage polyester filament is less than 0.3 d, the pile length is 2 mm.
With an automobile interior material of up to 3 mm, the pile upright shape cannot be maintained. Conversely, if it exceeds 1.5 d, the velvet-like contact feeling cannot be obtained because the second moment of area of the filament is too high. When the number of crimps after shrinking the yarn freely with boiling water is more than 0.5 / cm, when the above warp knitted fabric is dyed, the filament is twisted to form an upright shape. It cannot be maintained and a velvet-like touch cannot be obtained. In addition, the elastic modulus after boiling water treatment is 650 kg
If it is less than / mm ^2, the upright shape of the pile cannot be maintained in the same manner as described above, and a velvet-like tactile sensation cannot be obtained. On the other hand, when the relatively thick high-shrinkable polyester filament has a fineness of less than 3 d, the waist is weak even after the appearance of crimping and the pile collapse cannot be reduced. If it exceeds 0d, it becomes too hard to obtain a velvet-like touch. When the number of crimps after the treatment with boiling water is 3.0 or less per cm, the effect of preventing pile collapse and the effect of showing the side of the fiber from above is reduced. Velvet-like appearance quality is impaired. In addition, the boiling water shrinkage rate is 20
%, The difference in height from the pile made of thin low-shrinkage polyester filaments is reduced to less than 10% when crimping and shrinkage are developed in the dyeing finish after forming the pile, and a velvet-like Tactile sensation cannot be obtained. EXAMPLE A polyethylene terephthalate was spun at a spinning speed of 30.
Spun at 00 m / min, heat-treated after stretching, and wound up.
A multifilament yarn A composed of polyester filaments having a relatively small thickness of 0 denier and 72 filaments having a low shrinkage was obtained. The multifilament yarn A had a crimp number of 0.2 pieces / cm, a shrinkage rate of boiling water of 6.8% and an elastic modulus of 980 kg / mm ² when freely shrunk with boiling water. On the other hand,
Similarly, spinning speed of polyethylene terephthalate is 3000
m / min, and spinning by applying a cooling air from one direction directly below the nozzle, and after stretching, winding without heat treatment.
Multifilament yarn B comprising a relatively thick high-shrinkage polyester filament of 12 denier filaments
Got. The multi-filament yarn B had a crimp number of 4.3 / cm and a shrinkage of boiling water of 28.7% when freely shrunk with boiling water. The above low shrinkage multifilament yarn (5)
0 denier 72 filaments) A and a high shrinkable multifilament yarn (100 denier 12 filaments) B are subjected to air entanglement treatment to form a mixed yarn having a entanglement number of 34 / m. Was supplied to a 22-gauge double Russell machine as pile yarn. In addition, 100
Another polyethylene terephthalate yarn of denier was supplied and knitted. After knitting, the pile yarn connecting the front knitted fabric and the back knitted fabric is cut at the center, and the pile density is 80200 denier /
A pile warp knitted fabric of cm ² was obtained. Then, the pile warp knitted fabric is dyed, and the side of the finished pile warp knitted fabric is taken in an enlarged photograph, and the pile of the thin low shrinkage polyester filament is made of a thick high shrinkage polyester filament. 25. on average over length.
It was confirmed that it was 7% longer. The pile warp knitted fabric of the example had a smooth velvet-like appearance and tactile feel on the surface, was moderately bulky, and was good in that white blurs and whitening defects were not noticeable. Spinning speed of polyethylene terephthalate is 3
Spun at 000 m / min, heat-treated after stretching and wound up,
A multifilament yarn of 150 denier 72 filaments was obtained. This polyethylene terephthalate yarn was knitted according to the same knitting standard as in the above-described example, and subjected to the same dyeing finish processing to obtain a pile warp knitted fabric of a comparative example. The pile warp knitted fabric of this comparative example had a velvet-like appearance and tactile sensation, but was apt to fall down, and was apt to have white blurring and whitening defects. The pile warp knitted fabric of the present invention has a fineness of 0.3
1.5 to 1.5 denier, a relatively thin low-shrinkable polyester filament having a crimp number of 0.5 / cm or less and an elastic modulus of 650 kg / mm ² or more after being freely shrunk with boiling water, and a fineness of 3.0 to 12. A cut pile formed of a composite yarn with a relatively thick high-shrinkage polyester filament having a denier of 0 to 30 and a crimp number of 3.0 to 30 / cm after being freely shrunk with boiling water and a shrinkage ratio of boiling water of 20% or more. Therefore, when the warp knitted fabric is dyed and finished, the pile is freely shrunk by the heat effect of this process, and the thick high-shrinkage polyester filaments exhibit more crimps than the thin low-shrinkage polyester filaments. Shrink. Accordingly, the thin, low-shrinkage polyester filaments stand upright to form a high pile and emerge on the surface of the pile layer to give a velvet-like appearance and feel. on the other hand,
The relatively thick, high-shrinkage polyester filaments form a low pile, and their crimps prevent the thin, low-shrinkage polyester filaments from falling down and also show the side of the fiber when the pile is viewed from directly above. To reduce whitening defects and whitening defects. That is, according to the present invention, it is possible to simultaneously achieve the two objects of maintaining a velvet-like appearance and preventing hair fall, which have been impossible to achieve simultaneously.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) D04B 21/00-21/04 D02G 3/04

Claims (1)

(57) [Claim 1] Polyester multifilament yarn is used for at least the pile yarn of the pile yarn and the ground yarn.
And a pile warp knitted fabric constituting a cut pile, wherein the pile yarn has a fineness of 0.3 to 1.5 denier, a crimp count of 0.5 / cm or less after being freely shrunk with boiling water, elasticity. A relatively thin, low-shrinkage polyester filament having a rate of 650 kg / mm ² or more, a fineness of 3.0 to 12.0 denier, and a crimp number of 3.0 to 30 crimps after being freely shrunk with boiling water.
m. A pile warp knitted fabric comprising a composite yarn with a relatively thick high-shrinkage polyester filament having a boiling water shrinkage of 20% or more.