JPS63249748A - Polyester knitted fabric having plastic characteristic - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a polyester knitted fabric made of ultrafine fibers, and more particularly to a polyester knitted fabric characterized by plastic wrinkle characteristics.

(Prior Art and Problems) Conventional polyester knitted fabrics generally have excellent mechanical strength, color fastness, etc., and are widely used for clothing, industrial materials, etc. However, the disadvantages of these conventional polyester knitted fabrics are that they have a hard feel and are rough to the touch.

In recent years, the technology for making ultra-fine fibers has been developed as the main constituent technology for artificial leather, and it has also been found that knitted fabrics using these ultra-fine fibers have a significantly softer texture.

(Means for solving the problem) As a result of various studies on knitted fabrics using ultra-fine fibers, we have found that by specifying the single and total fineness of the ultra-fine yarns, as well as the viscosity of the fibers, we have achieved unprecedented plasticity. The present invention was finally achieved by discovering that a knitted fabric having wrinkle characteristics can be obtained.

That is, the present invention provides the following characteristics: (1) The single yarn fineness is 0.2 denier or less, the number of single yarns is 300 or more, and the solution viscosity of the fiber (ηsp/c
) is in the range of 0.4 to 0.55.

(2) In a knitted fabric composed of the polyester multifilament described in (1) above and fibers other than the polyester multifilament, the weight ratio of the fibers other than the polyester multifilament is 20% or less with respect to the polyester multifilament. Regarding interlaced knitted fabrics.

The gist of the present invention is to provide a polyester knitted fabric that has plastic wrinkle characteristics that have not been seen in conventional polyester fibers or ultrafine polyester fibers. The fact that the wrinkle characteristic is plastic means that, for example, when a knitted fabric is pinched by hand, wrinkles are formed in the shape of a squeezed \, and when the wrinkles are smoothed out by hand, they are easily removed, leaving no trace of wrinkles. This can be explained by the following development. That is, the vibration of the present invention is characterized in that wrinkles are easily formed, but can be easily removed, and the wrinkles have no rebound elasticity.

Plasticity in the present invention can be expressed numerically by measuring wrinkle resistance using the wire method of JIS-L-1096.

That is, in the case of a knitted fabric of ordinary thickness such as polyester, nylon, or acrylic, the thickness is 60% or more, but in the case of the product of the present invention, it is 35% or less. In addition, in the case of the above-mentioned ordinary fiber knitted fabric, it recovers when left undisturbed and the anti-wrinkle value becomes larger than the initial value, but the product of the present invention is characterized in that it does not recover and the value does not change even when left unattended. .

In the case of knitted fabrics made of 100% ultrafine polyester fibers of the present invention, the wrinkle resistance value is 20% or less, but in the case of knitted fabrics with 20% or less, the wrinkle resistance value is slightly higher and is 35% or less. . Even in this case, no recovery in the wrinkle resistance value was observed due to neglect. In the case of a cross rope item, for example, if it is tricot knitted and uses ultrafine polyester fibers for the front and regular fibers for the back, the wrinkle resistance is measured by folding the item with the ultrafine fiber side facing up and measuring the degree of wrinkle resistance. If this is reversed and measured, the wrinkle resistance value will be a high value and will not accurately reflect the wrinkle characteristics of the actual knitted fabric of the present invention.

Furthermore, the product of the present invention has an extremely flexible texture unique to ultra-fine fibers, and when the knitted fabric has a small area weight, it has both flexibility and drapability, and when the knitted fabric has a large area weight, it has both flexibility and weight. A knitted fabric having both drapability and drapability can be obtained.

In the present invention, the single yarn fineness is 0.2 denier or less, preferably 0.
．． 0.05 to 0.2 denier. The number of single threads must be 300 or more. If the single yarn fineness exceeds 0.2 denier, the plastic wrinkle characteristics referred to in the present invention cannot be obtained. If the denier is less than 0.05 denier, it tends to be difficult to obtain a good color in terms of color development and color fastness. Furthermore, if the number of single yarns is less than 300, knitting properties will be reduced.

Solution viscosity (ηsp
/c) is 0.4 to 0.55 when measured at 1% polyester concentration in O-chlorophenol solution and 30°C.
It is necessary to have a range of Usually, the solution viscosity (ηsp/c) of polyester fiber is 0.65 or more, and when it becomes less than 0.65, the mechanical strength, rigidity, etc., which are characteristics of polyester, decrease. Therefore, low viscosity fibers such as those of the present invention are not currently available on the market.

However, the present inventors set the solution viscosity of polyester fiber to 0.
．． They discovered that the plastic wrinkle properties referred to in the present invention can be obtained by setting the viscosity to an unconceivably low viscosity of 4 to 0.55. If the solution viscosity is less than 0.4, it is difficult to form fibers, and even if a fibrous material is obtained, its mechanical strength is too weak to be practical.

Moreover, if it exceeds 0.55, it becomes difficult to obtain the plastic wrinkle property that is a feature of the present invention.

In the present invention, this low viscosity polyester fiber can be used alone or in combination with other fibers to form a knitted kM product.

In the case of alternating knitting, by selecting the material, thickness, and ratio of the mating fibers, other characteristics can be imparted without sacrificing the plastic wrinkle characteristics that characterize the present invention. For example, when combined with polyester or polyamide fibers of normal thickness, dimensional stability can be imparted to knitted fabrics, and when combined with highly shrinkable fibers, knitted fabrics with high density can be obtained. In the present invention, the proportion of the fibers to be inter-knitted is 20% or less, preferably 15% or less, based on the yarn weight of the low-viscosity ultrafine polyester. If it exceeds 20%, it becomes difficult to obtain the plastic wrinkle properties as defined in the present invention. The fibers to be combined are polyester,
Any of synthetic fibers such as polyamide and acrylic fibers, recycled fibers such as rayon, cuprammonium fibers, and acetate, and natural fibers such as cotton and wool can be used.

Direct spinning method, sea-island fiber method,
Various methods such as the split fiber method are known, and there are no particular limitations in the present invention, but in view of suitability for knitting, it is preferable to use raw yarn produced by the direct spinning method. Furthermore, if the viscosity of the polyester is made low from the polymerization stage, the low-viscosity fiber used in the present invention can be easily obtained.

The knitting structure may be either a vertical knitting structure or a circular knitting structure.

The resulting knitted fabric is subjected to conventional dyeing and finishing processes and conditions.

The knitted fabric of the present invention can be finished by various methods as long as the effects of the present invention are not lost. For example, the surface can be raised using emery paper, brush cloth, etc.

Alternatively, a layer of an elastic polymer can be formed on the surface by coating, laminating, or other methods. Alternatively, embossing, printing, and other commonly known processing can be performed. Further, as a finishing agent treatment, a softener, a water repellent, an antistatic agent, etc. can be used.

(Example) The present invention will be described in more detail below according to Examples. The plastic properties referred to in the present invention are measured by the following method.

Measurement method: Measurement of wrinkle resistance according to JIS-L-1096 (wire method) ■ Fold a 1 x 4 cm test piece in half at right angles to make 1 x 20, place it on a glass plate, apply a load of 500 g, and leave it for 5 minutes. The folded part was placed on a wire having a diameter of 0.511 m, and after another 5 minutes, the opening angle was measured and the wrinkle resistance rate was calculated using the following formula.

■Furthermore, measure the wrinkle prevention rate after applying the above method (■) and leaving it for 2 hours to examine the degree of wrinkle recovery.

Example 1 A polyester multifilament of 100 denier/1000 filaments was obtained using a conventional spinning machine for polyester. This fiber was dissolved in a solution of 0-chlorophenol and the solution viscosity was measured and found to be 0.49. This fiber was interlaced. Next, a tricot half-knitted fabric with a half-structure was fabricated using this polyester fiber for both the front reed and the back reed using a 28 gauge/inch two-reed tricot machine.

Next, this knitted fabric is dyed at 130℃ using a circular dyeing machine.
×30 minutes Dyed blue with disperse dye. For finishing, a small amount of a commercially available antistatic agent was applied.

The wrinkle resistance of the obtained knitted fabric was measured and the following values were obtained.

Initial wrinkle prevention rate: 8% Wrinkle prevention rate after 2 hours: 8% In other words, the initial wrinkle prevention rate was low and remained the same even after 2 hours.

Comparative Example 1 A polyester multifilament of 100 denier/48 filaments was obtained using a conventional spinning machine for polyester. The obtained fiber was dissolved in a solution of O-tetrachlorophenol and the solution viscosity was measured and found to be 0.49. This fiber was knitted in exactly the same manner as in Example 1, and the wrinkle resistance was measured to obtain the following values.

Initial wrinkle prevention rate: 65% Wrinkle prevention rate after 2 hours: 72% The initial wrinkle prevention rate was 62%, and it recovered to 72% by leaving it for another 2 hours.

Example 2 50 denier/6 using a regular polyester spinning machine
A polyester multifilament of 00 filament was obtained. The obtained fiber was dissolved in 0-chlorophenol and the solution viscosity was measured and found to be 0.51. This fiber was twisted at 200 turns/m using a ring twisting machine. Next, using this structure, a smooth continuous fabric was made using a double-sided circular knitting machine with 28 stitches/inch.

This knitted fabric was dyed in the same manner as in Example 1.

When the wrinkle resistance rate of the obtained knitted fabric was measured, the following values were obtained.

Initial wrinkle prevention rate 10% Wrinkle prevention rate after 2 hours: 10% There was no difference in the wrinkle resistance value at the initial stage and after 2 hours.

Example 3 A cross-knitted fabric was made using the polyester fibers of 100 denier/1000 filaments and ηsp/c=0.49 obtained in the example process and the nylon 66 fibers of 30 denier/10 filaments. The weight ratio of the knitted polyester fibers and nylon 66 fibers was 90:10.

The knitting conditions were as follows.

Tricot machine (28 gauge/inch) front reed
Polyester 100 denier/1000 filament back reed Nylon 6630 denier/10 filament satin structure The wrinkle resistance of this material was measured and the following values were obtained.

Initial wrinkle prevention rate 25% Wrinkle prevention rate after 2 hours: 25% There was no difference in the wrinkle resistance rate at the initial stage and after 2 hours.

Example 4 100 denier/1000 filament polyester fiber obtained in Example 1 with ηsp/c=0.49 and 50 denier/48 filament polyethylene terephthalate/
Using adipic acid copolymer fiber, the above-mentioned ultrafine polyester fiber is fed to the rubber knitting part of the first yarn feeding, and the same polyester copolymer fiber mentioned above is fed to the jersey knitting part of the second and third yarn feeding, resulting in a Milano rib structure. I got the knitted fabric.

When this knitted fabric was dyed, it shrunk and became dense due to the influence of copolymerization. Moreover, the dimensional stability was also good.

The wrinkle resistance rate of the obtained knitted fabric was measured and the following values were obtained.

Initial wrinkle prevention rate 29% Wrinkle prevention rate after 2 hours: 29% The wrinkle resistance rate did not change between the initial stage and 2 hours later.

Example 5. Comparative Example 2 Various pre-knitted fabrics shown in Table 1 were prepared in the same manner as in Examples 1 to 4, and their properties were investigated to obtain the results shown in Table 1.

Margin below

Claims (2)

[Claims] (1) The single yarn fineness is 0.2 denier or less, the number of single yarns is 300 or more, and the fiber solution viscosity (ηsp/c
) is in the range of 0.4 to 0.55 polyester knitted fabric made of polyester multifilament (2) The single yarn fineness is 0.2 denier or less, the number of single yarns is 300 or more, and the solution viscosity of the fiber (ηsp/c
) is in the range of 0.4 to 0.55, and the knitted fabric is composed of a polyester multifilament and fibers other than the polyester multifilament, and the weight ratio of the fibers other than the polyester multifilament is 20 to the polyester multifilament. % or less