JPS59187602A - Panty stocking or stocking - 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 The present invention relates to pantyhose or stockings (hereinafter both are collectively referred to as stockings) that have excellent transparency and durability.

Conventionally, the thermoplastic synthetic fibers used to make stockings are torque-type or woolly-type false-twisted yarns of so-called inelastic thermoplastic synthetic fibers such as nylon 6, nylon/66, and polytetramethylene terephthalate (-). It is used.

Transparency, beauty of the rope surface, and durability are very important characteristics required for stockings.

Conventionally, studies have focused on reducing the number of filaments and reducing the total fineness as measures to improve transparency, but when considering durability when worn, conventional stockings have There is naturally a limit to reducing the amount of fineness and the total fineness. That is, transparency and durability were contradictory.

In view of the above-mentioned situation, the inventors of the present invention have determined that, in terms of the durability of stockings, if the strength is less than 70f77, damage will occur when putting on and taking off or during long-term continuous use. At least the strength of the thread? It is an essential requirement that it be Ot/7 or higher,
In terms of transparency, the total denier is 3 to 13.
We have found that denier is an essential requirement. Therefore, we developed a false-twisted yarn made of high-strength capolyamide fibers and used the raw yarn as knitting yarn for stockings, thereby creating stockings that have both transparency and durability. That is, one of the important features of the present invention is that the knitted yarn constituting the stockings is made of the above-mentioned false twisted yarn of high-strength polyamide fiber.

The present invention provides pantyhose or at least the leg portions of stockings made of polyamide synthetic fibers having a relative viscosity of 2.8 or more and less than 3.5, and a total fineness of 3 to 13.
Denier, number of filaments is 1 to 8, and thread strength is 70? Pantyhose or stockings characterized in that they are knitted using a false twisted yarn having a roughness of /7 or more as the main knitting yarn.

The present invention will be explained in detail below.

Polyamide, which is the raw material for the fiber intended in the present invention, is heated at 20°C.
Those with a relative viscosity of 2.8 or more and less than 3.5 when measured in a 96% concentrated sulfur solution at a polymer concentration of 10 t1v/-, such as polycarbolactam, polyhexamethylene adipamide, polyhexamethylene Sebacamide, copolymers of these polyamides and millet. 4-Cyclohexanebis(
There are polyamides made from the condensation product of methylamine) and a linear aliphatic dicarboxylic acid as a single material. Such polyamides can be blended with matting agents, pigments, light stabilizers, heat stabilizers, antioxidants, antistatic agents, dyeability improvers, adhesion improvers, etc. as necessary. All can be used except those which have a serious adverse effect on the characteristics of the present invention depending on their formulation.

The method for manufacturing the knitting yarn used in the stockings of the present invention will be described in more detail. At least the leg portions of the stockings of the present invention are made of polyamide synthetic fibers having a relative viscosity of 2.8 or more and less than 3.6. That is, the polyamide fibers constituting the stockings of the present invention are obtained by melt-spinning polyamide having a high relative viscosity, which is 2.5 at most in conventional polyamides, and then drawing it. Of course, it can also be produced by a direct spinning/drawing method. If a polyamide with a relative viscosity of less than 2.8 is used, the total fineness, which is an essential requirement of the present invention, will be 3 to 13.
It is extremely F to ensure a thread strength cuff of 0 f/7 or more in denier! It's very difficult.

Next, a method for manufacturing the polyamide yarn constituting the present invention will be briefly described, but the present invention is not limited to the following method. Polyamide ll constituting the present invention
In the production of 11m, the spinning and drawing process, especially the drawing process, is important. That is, for example, a birefringence o obtained by melt-spinning polyamide with RV≧3.0, o o 2 to 0.03
When the undrawn yarn of No. 5 is stretched continuously after spinning or after being wound once, between the undrawn yarn first supply roller and the undrawn yarn tube maintained at 100° C. or lower, and the second supply roller, 1
．． It is preferable to give a preliminary stretching of 10 times or less, and then perform a first stage stretching at a total stretching ratio of 40 or more with the first stretching roller. 1. A high-temperature pressurized steam jetting nozzle is provided between the four drawing rollers, and the nozzle temperature is set to 200° C. or higher to jet high-temperature steam, and the stretching point is fixed near the high-temperature processing steam jetting nozzle.

Furthermore, when performing the second stage stretching, a slit heater (with an ambient temperature of 170 to 350°C) provided between the first stretching roller and the second stretching roller is used.
A heating device that has a slit as a yarn running path, and heats the yarn while running through the slit in a non-contact state: Ambient temperature refers to the temperature inside the slit. , 3 seas or more, and then subjected to the second stretching roller. At that time, a temperature gradient is created in the slit heater to reduce the atmospheric temperature at the yarn entrance by 1.
It is preferable to set the exit atmosphere temperature to 60° C. or higher and 850° C. or lower, and to allow the yarn to pass through the yarn so that it can stay in the atmosphere of 170 to 350° C. for 0.3 sθO or more.

In addition, after the two-stage stretching, it is possible to further improve the dimensional stability by performing a relaxation treatment of 10% or less at 210 to 150°C either continuously without winding or after winding. It is.

The high-strength polyamide fibers obtained as described above are false-twisted under normal false-twisting conditions, and the same conditions as those for producing normal knitting yarns for stockings can be selected.

6 - The high-quality caproamide fibrous yarn that is the knitting yarn for stockings of the present invention has been described in detail above, but one of the more important requirements for the present invention is that the total fineness of the knitting yarn for stockings is 3 to 13. It is a false twisted yarn having a denier, a filament count of 1 to 8, and a yarn tenacity of 7 ot/y or more. The number of constituent filaments is 1 or more
In the case of 3 filaments (well, it becomes a torque type, and in the case of 4 to 8 filaments, it becomes a woolly type. When the number of constituent filaments is 1 to 3, the number of snarls is preferably 50 to 1000 pieces/m. Stockings are knitted using knitting yarn, and the knitting method may be circular knitting or full fashion knitting.Furthermore, in the stockings of the present invention, at least the leg portions are knitted using knitting yarn made of the above-described high-strength polyamide fiber. However, other parts, such as the pants part, ankle part, heel part, sole part, and toe part, may be knitted only with the above-mentioned knitting yarns, or depending on the part, they may be knitted with other yarns. Alternatively, the knitting yarn may be mixed with other fiber yarns.

The configuration and effects of the present invention will be explained below using Example F1, but the present invention is not limited by the following example. In the examples, "part" and "%" indicate 1 part by weight -1 and "% by weight" unless otherwise specified.

In the example, polycaproamide having a relative viscosity of 3.0 was used as a raw material and spun and drawn under the conditions shown in Tables 1 to 2 to obtain drawn yarns having the quality shown in Table 3.

Next, false twisting was performed under the following false twisting conditions.

False-twisted body° Polyurethane friction disk False-twisting temperature: 180° C. False-twisting speed near oom/min Table 4 shows the physical properties of the obtained false-twisted yarn.

Stockings were knitted from the false twisted yarn of Example 1 shown in Table 1, Table 9, Table 2, Table 10, and Table 3, Table 4, using a 32-gauge knitting machine, and a wear test was conducted.

As a comparative example, two types of stockings knitted using nylon 6-fiber yarn with a relative viscosity RV of 2.5 were also subjected to wear tests at the same time, and the wear resistance and tear occurrence rate were discussed. The results are shown in Table 5.

Table 5 As is clear from Table 5, although the stockings of the present invention, Example 1, have a fine denier brand, they have a long wear resistance, have a low tearing rate, and have sufficient wear resistance. Moreover, the transparency when worn was overwhelmingly superior to that of the comparative example.

The method for measuring the main parameters used to specify the structure and measure the physical properties of the fibers constituting the present invention will be described below.

Measuring method of relative viscosity〉 96.3±0.1 wt% Reagent Prepare a sample solution by dissolving the sample in special grade concentrated sulfuric acid so that the polymer concentration is 10η/-, and heat at 20℃±0.05 The relative viscosity of the solution is measured using an Ostwald viscometer with an ice fall time of 6 to 7 seconds at a temperature of .degree. For measurement, use the same viscometer and calculate the relative viscosity RV using the following formula from the ratio of the falling time To (seconds) of 20 tnt of sulfuric acid, which is the same as when preparing the sample solution, and the falling time TI (seconds) of 20 d of sample solution. Calculate using.

nv = Tt / T O (11) <Method for measuring birefringence (△!1)> Nikon fM optical R microscope POH type Line Berec compensator was used, and the light source was spectral light source starting liquid N (Toshiba SLS-3-B type) was used (Na light source). 5
A sample cut at an angle of 45° C. to the fiber axis with a length of ~6tIIIn is placed on a glass slide with the cut surface facing up. Place the sample slide glass on the rotating stage, rotate the rotating stage so that the sample is at a 45 degree angle to the polarizer, insert the analyzer, set the dark field, and set the compensator to aO. count the number of stripes (n
Individual). Compensator scale a is the point at which the sample first becomes darkest when the compensator is turned clockwise.

Turn the compensator counterclockwise and measure the scale of the compensator at the point where the sample first becomes darkest (read up to 1/1o scale), then return the compensator to 30 and use the analyzer. Remove the sample, measure the diameter d of the sample, and calculate the birefringence (Δn) using the following formula (average value of 20 measurements).

△n=T/d (T-nλ0+ε) Sunny 14
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Claims (1)

[Claims] (1) Pantyhose or at least the leg portions of the stockings are made of polyamide synthetic fibers with a relative viscosity of 2.8 or more and less than 3.5, a total fineness of 3 to 13 deniers, and a filament count of 1 to 8. Pantyhose or stockings, characterized in that the pantyhose or stockings are knitted using a false twisted yarn having a yarn tenacity of 70977 or more as the main knitting yarn.