JPH0819588B2 - Method of manufacturing socks - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for producing socks and socks such as socks and stockings.

[Conventional technology]

Polyurethane-based elastic yarns, which have excellent elastic properties,
On the other hand, it has drawbacks such as dyeing properties, mechanical strength, and abrasion resistance properties, so it is widely used in the production of hosiery as a coated elastic yarn obtained by double winding thermoplastic synthetic fibers such as polyamide long fibers. ing. For example, JP-A-47-19
Japanese Patent Publication No. 146 discloses that a polyurethane elastic yarn is stretched and wound with a covering yarn. In such an example, the double-coated bobbin twist number is 2600 times /
It is common to improve the covering property by a combination of the denier of the covering yarn and the corresponding number of lower twists and upper twists so that the number of m and the number of twists of the upper thread are 1800 times / m. However, such a method causes problems such as an increase in manufacturing cost and a decrease in elasticity due to the high twist number. The covering property can also be improved by increasing the denier of the covering yarn, but the covering elastic yarn itself becomes thicker, and it is a constraint in the application field where the transparency of the obtained product is strongly required such as when it is used for stockings. It is what is done.

Further, Japanese Patent Publication No. 18063/1985 discloses a method of covering a false twist stretch processed yarn on a polyurethane elastic yarn, and the yarn obtained by this is stretchability of the false twist stretch processed yarn which is a covering yarn. The present invention relates to an improvement of a so-called single covering yarn, which is a covered elastic yarn having an appearance and a soft appearance similar to a stretched yarn, which makes full use of original properties such as bulkiness.

Therefore, such a coated elastic yarn is still unfavorable in the field where the transparency of the obtained product is strongly required such as for stockings.

[Problems to be Solved by the Invention]

The present invention mainly aims to solve the above-mentioned problems and to provide a method of manufacturing socks having excellent transparency and durability.

[Means for solving the problem]

In order to achieve the above object, the present invention has the following configuration.

That is, the core yarn made of elastic fiber, the coating yarn made of long fibers of the thermoplastic polymer is wound in a double, and,
Mainly a double-coated elastic yarn in which the covering yarn wound on the inner side is a crimped yarn having a stretch recovery ratio of 10% or more, and the covering yarn wound on the outer side is a non-crimped yarn. It is a method of manufacturing socks, which is characterized by being knitted into socks.

[Embodiment of the invention]

 Hereinafter, the present invention will be described in more detail.

In order to reduce the number of winding twists of the covering yarn and to improve the covering property, the type of the covering yarn and its characteristics are important points, and the present inventors have made diligent studies in view of this point. As a result, it has been found that the object of the present invention can be achieved by using a crimped yarn as the covering yarn. That is, first, as the covering yarn to be wound inside, a crimped yarn having an expansion and contraction recovery rate of 10% or more is used. By the effect of such high crimp,
The inner winding yarn improves the coverage. If the expansion and recovery rate is less than 10%, the covering effect due to the crimp is reduced, which is not preferable.

Then, a non-crimped yarn is used as a covering yarn to be wound on the outside. Although the crimped yarn wound on the inner side exhibits a covering effect, it is not preferable in terms of the bulkiness of the covered elastic yarn, but the non-crimped yarn wound on the outer side causes the covered elastic yarn to It is intended to regulate the bulkiness in the diametrical direction.

In this way, the inside is bulky, and by tightening this from the outside, not only the appearance covering property is further improved, but also the stability against external force such as seawater is improved,
Substantial coverage and compactness of the thread form are improved. As a result, it becomes possible to reduce the number of winding twists, and productivity is also improved. In the present invention, hosiery is made using such double-coated elastic yarn, so that a clean product having a good transparency can be obtained, and its durability in actual wearing is greatly improved.

Next, the crimped yarn wound on the inner side is a false twist that is twisted in the direction opposite to the twisting direction of the winding-heat setting-untwisting means that overtwisting and torque of the false twisted yarn The effect of the increase is particularly brought about. That is, the over-untwisting of the false twisted yarn improves the stretchability and the covering property, and the effect can be exhibited even in the covered elastic yarn. Regarding the torque increase, the torque of the double coated elastic yarn is dominated by the torque of the outer coated yarn rather than the torque of the inner coated yarn, and in order to balance this, the torque of the inner coated yarn is increased. Since it is effective to do so, the effect can be effectively utilized.

Further, the false twist crimped yarn can be subjected to false twisting using a fiber yarn having a circular cross section, and even if it is made noncircular by the action of twisting and heating, the cross-sectional shape effect can be further improved.

Furthermore, the fact that the covering yarn wound on the outer side is a non-crimping torque type yarn suppresses the crimp of the inner covering yarn, and the surface of the covering elastic yarn has a uniform and compact form. It is important to obtain the torque, and the false twist torque yarn having a torque in a direction that cancels the torque generated by the crimped yarn being wound on the inside is wound on the outside so that the torque of the coated elastic yarn is The effect that can be reduced as much as possible is exhibited. That is, in the combination of the lower twist and the upper twist that maximize production efficiency, the torque of the false-twisted yarn coated on the inside is large, and therefore a torque type yarn having a torque that cancels it is preferable.

The elastic fiber used in the present invention is preferably a polyurethane-based elastic fiber generally called spandex fiber,
Other types of elastic fibers may be used.

On the other hand, as the long fibers of the thermoplastic polymer forming the coating yarn, polyamide, polyester, polyolefin, polyacrylic fiber and the like are used, but a polyamide excellent in dyeing properties, mechanical strength, abrasion resistance, etc. is preferable, Further, among polyamides, nylon 6 and nylon 66 fibers, which are particularly excellent in these properties, are preferable.

The crimped yarn used in the present invention is not limited in its processing method as long as it is a processed yarn having a crimping property with an expansion / contraction recovery rate of 10% or more, but it is inexpensive and easily obtains a high degree of crimping. And a false twisted yarn having an appropriate torque is most preferable.

The non-crimpable torque type false twisted yarn that can be used in the present invention means a yarn that does not substantially show crimps in a covered state, and the number of false twists in a usual false twist crimping process. T (times / m) to the yarn fineness (D), Whereas the false twist number T (times / m) is processed according to the yarn fineness (D), In addition, the heat setting temperature is 40 to 110 ° C. lower than the melting point of the yarn, preferably 50 to 90 ° C. lower than the melting point of the yarn.

〔Example〕

 Hereinafter, the present invention will be described in more detail with reference to examples.

20 denier, 3 filament spandex fiber
While being stretched 3.2 times, double covering (twisting Z direction 2900 times / m, upper twisting S direction 2500 times / m) was performed with an ordinary covering machine. The covering yarns used at this time and the covering conditions are as shown in Table 1.
Nylon 6 of -7F and 15D-5F on the outside was used, and the yarn type, crimp characteristics, and twisting direction (torque) of false twist were variously changed. The coatability of the obtained coated elastic yarn was visually evaluated using a magnifying glass, and the torque of the coated elastic yarn was evaluated to the extent that snare was generated during knitting of the stocking and knitted into the stocking. The judgment was made in four steps of → △ → ×. ⊚ and ○ are practical, but Δ and × are serious problems and impair the quality of stockings.

The stretchability of the covered elastic yarn is defined as the stretch ratio of the elastic yarn after the covered elastic yarn is treated with boiling water until the loosened portion of the covered yarn is fully stretched.

However, the torque value is 1 m when the number of twists generated (number of twists per 50 cm) is measured by applying a load of 1 g to the center of a torque type thread with a length of 1 m to hang it down.
It is converted to per hit.

As can be seen from these results, by coating the crimped yarn on the inner side and the non-crimped yarn on the outer side as the covering yarn, a good covered elastic yarn having a good balance of covering property, torque, and stretch rate was obtained. It is what is done. More preferably, specifying the crimping characteristics and the twisting direction of the false twisted yarn coated on the inside is effective for improving the covering property and the stretch rate. That is, the false-twisted yarn having a stretching recovery rate of 10% or more and further subjected to twisting, heat setting and untwisting in the direction opposite to the twisting direction to be coated exerts its effect particularly. Further, the non-crimped yarn to be coated on the outside is preferably a torque type yarn, and by using a yarn in the torque direction in which the torque of the torque type yarn increases, the torque on the inside and the outside of the coated elastic yarn is balanced. is there. That is, by using a false-twisted yarn that is twisted in the opposite direction to the outside and twisted in a direction opposite to the twisting direction, heat set, and untwisted, a coated elastic yarn having a torque balance and substantially no problems during knitting is obtained. Is what you get.

[Effect of the Invention] According to the present invention as described above, since a coated elastic yarn that simultaneously satisfies many factors such as covering property, stretchability, and manufacturing cost, which have been problems in the related art, is used for manufacturing socks, transparency is improved. And it is possible to manufacture socks having excellent durability.

Claims (3)

[Claims] 1. A core yarn made of an elastic fiber, and a coating yarn made of a long fiber of a thermoplastic polymer is wound around the core yarn twice, and
Mainly a double-coated elastic yarn in which the covering yarn wound on the inner side is a crimped yarn having a stretch recovery ratio of 10% or more, and the covering yarn wound on the outer side is a non-crimped yarn. A method of manufacturing socks, which is characterized in that it is knitted into socks. 2. A double-coated elastic yarn in which a covering yarn wound inside is a false-twisted yarn which is twisted in a direction opposite to the winding twisting direction, heat set and untwisted. The method for producing socks according to claim (1), characterized in that: 3. A coating yarn wound on the outside is a non-crimp type torque type, and has a torque in a direction of canceling the torque generated by winding the crimped yarn on the inside. The method for producing socks according to claim (1) or (2), characterized in that a certain double-coated elastic yarn is knitted.