JPH0559657A - Cheese dyeing method of stretchable conjugate yarn - Google Patents

Abstract

PURPOSE:To provide a cheese dyeing method with small difference in stretch recovery between an inner layer and an outer layer of wound yarn layer of stretchable conjugate yarn and of producing previously dyed yarn in a short time and efficiently without requiring skill. CONSTITUTION:In a cheese dyeing method wherein spandex yarn is used as core yarn, other yarn is arranged on the periphery of the core yarn to give stretchable conjugate yarn, which is wound on cheese to give a material to be dyed and the material is dyed, the cheese is made of a polypropylene starting softening at >=60 deg.C and a thermally shrinkable cheese having structure wherein plural fence-like members consisting of a pair of parallel longitudinal skeleton members and plural leap spring-like members bridging a pair of the longitudinal skeleton members are arranged in parallel in the peripheral direction is used. The conjugate yarn is wound on the thermally shrinkable cheese by slightly overfeeding the stretchable conjugate yarn at a feed speed based on a revolving speed of the thermally shrinkable cheese.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cheese dyeing method for a stretchable composite yarn which requires uniform yarn dyeing, and more particularly, to a difference in stretch recoverability between an inner layer and an outer layer of a cheese winding yarn layer after dyeing. The present invention relates to a method of performing uniform dyeing which is improved significantly and which does not require skill by hand and is efficiently dyed.

[0002]

2. Description of the Related Art For example, the dyeing method for stretchable composite yarns using spandex fibers as core yarns has hitherto been centered on skein dyeing. However, the work is complicated, such as the need to insert a cracker thread, and it requires manpower and skill, so that simplification and labor saving have been required. Although cheese dyeing is also performed in some areas, there is a problem in that there is a difference in stretch recovery between the inner layer and the outer layer of the winding yarn layer, the stretchability of the yarn is lost, and dyeing unevenness occurs.

[0003]

Stretchable composite yarns always try to return to a tension-free and stable state because they are covered with other fibers and fine-spun while adding several times the draft to the core yarn. Has stretch recovery. For this reason, the winding hardness after being rolled up on cheese increases with the passage of time. Furthermore, when it is subjected to dry heat or moist heat treatment such as dyeing, it tries to return to a more tension-free state, but the inner layer of the winding yarn layer cannot be freely shrunk because it is disturbed by the shape-fixing type normal cheese. Further, the winding pressure is applied by the stretch recovery force from the outer layer and restrained, and it is usually heated and set in a strong stretch state, so that the dyeing unevenness of the winding yarn layer tends to be extremely remarkable. In particular, the yarn in the inner layer lost elasticity and was a defective product.

The present invention has been made in view of the above circumstances, and greatly improves the difference in stretch recovery force between the inner layer and the outer layer of the wound yarn layer caused by cheese dyeing to maintain the elasticity of the yarn. Moreover, it is intended to provide a dyeing method for eliminating uneven dyeing.

[0005]

Means for Solving the Problems The present invention, which has achieved the above objects, is a cheese dyeing method in which a stretchable composite yarn having spandex fibers as core yarns and other fibers arranged around the yarns is wound around cheese and dyed. As the above cheese, while being formed of a thermoplastic that starts softening at a heat of 60 ° C. or higher, a pair of parallel longitudinal members and a plurality of leaf spring-like members bridging the pair of longitudinal members. The heat-shrinkable cheese having a structure in which a plurality of fence-shaped members are arranged in parallel in the circumferential direction is used, and the feeding speed of the stretchable composite yarn is overfeeded with respect to the rotation speed of the heat-shrinkable cheese. The gist is to wind the yarn around the heat-shrinkable cheese and dye it.

[0006]

The stretchable composite yarn in the present invention comprises a stretchable spandex fiber as the core yarn, and a fiber other than the spandex fiber is wound around the core yarn or arranged by being mixed. The covering yarn, core spun yarn, ply yarn and the like can be cited as examples. Since stretchable composite yarn has drafts on spandex fibers, it will continue to shrink to return to a stable tension-free state if left unattended, but if heat such as dry heat or wet heat is applied to this, The degree of shrinkage is even greater. When such a stretchable composite yarn is wound on a shape-fixing type general-purpose cheese that is not subjected to compression heat deformation and dyed, the shrinkage of the take-up yarn layer is disturbed by the cheese, so the shrinkage ratio is continuous (inner layer) <(middle layer). ) <(Outer layer), the set rate of the inner layer due to heat increases, and the stretch recovery property decreases.

The heat-shrinkable cheese in the present invention is formed of a thermoplastic which starts to soften at a heat of moisture of 60 ° C. or higher. This thermoplastic is, for example, polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride or the like having a softening point (ASTM D1525 method) of 60 to 110 ° C. The heat-shrinkable cheese has a substantially cylindrical structure in which a pair of parallel longitudinal members and a plurality of palisade members composed of a plurality of leaf spring members bridging the longitudinal members are arranged in parallel in the circumferential direction. Have (see FIG. 1). Therefore, in the heat-shrinkable cheese, the leaf spring-like member is mainly thermally deformed in the dyeing process after being wound up, and the heat-shrinkable cheese is compressed in the radial direction by the compressive force of the wound stretchable composite yarn (see FIG. 2). From the viewpoint of shrinkage, the material of the thermoplastic cheese is preferably polypropylene.

Since the heat-shrinkable cheese shrinks in the radial direction in this way, it does not prevent the shrinkage of the stretchable composite yarn in the inner layer of the winding yarn layer from being hindered, and hence the difference in the stretch recovery force between the inner layer and the outer layer is reduced. You can

In the cheese dyeing method, it is important to control the tension of the cheese winding, and in order to keep this tension constant, the feeding speed of the stretchable composite yarn is set to overfeed with respect to the rotation speed of the heat shrinkable cheese. That is, it is preferable that the feeding speed of the stretchable composite yarn is 105 to 155 with respect to the rotation speed of the heat shrink cheese of 100. If the feeding speed of the stretchable composite yarn is not overfeeded, the stretchable composite yarn is stretched by being tensioned, and excessive pressure that is difficult to control is applied to the heat-shrinkable cheese by the stretchable composite yarn. Therefore, not only the stretch recovery is impaired by heat setting due to dyeing, but also the heat shrinkage of the heat-shrinkable cheese changes due to fluctuations in uncontrollable tightening force, and therefore the stretch recovery also fluctuates and varies. The effects of the present invention cannot be fully exerted. In the present invention, as described below in Examples, the use of heat-shrink cheese improved the stretch divergence, but by making the feed rate slightly overfeed, surprisingly, the stretch recovery was significantly more remarkable. Has been improved.

[0010]

【Example】

Example 1 A covering yarn in which 20 denier spandex was multiplied by 3 times as a draft to form a core yarn and the periphery thereof was coated with a 70 denier nylon filament processed yarn was produced, and dyed at a rotation speed of 100 of heat-shrinkable cheese. Chromosomes were wound at a yarn feeding rate of 135 and stained with an Overmeier dyeing machine.

Example 2 Dyeing was carried out in the same manner as in Example 1 except that the feeding speed of the yarn to be dyed was 155 with respect to the rotation speed of the heat-shrinkable cheese of 100.

Comparative Examples 1 to 20 A spandex of 20 denier was draped three times to form a core yarn, and a covering yarn was produced by coating the core yarn with a nylon filament processed yarn of 70 denier, which was compressed by heat. A non-normal cheese was used to make a chromosome to be wound at a ratio of 100 rotations of the cheese to 100 times the feeding speed of the dyed yarn, and dyed with an Overmeier dyeing machine (Comparative Example 1). Further, the feeding speed of the dyed yarn of Example 1 was set to 100.
The same dyeing was carried out for the case (Comparative Example 2) and the case where the feeding rate was set to 135 using a normal cheese (Comparative Example 3).

5 dyed in Examples 1 and 2 and Comparative Examples 1 to 3
The stretch recovery (EC) of the inner layer and outer layer of each type of yarn winding yarn layer was compared, and the results are shown in Table 1. The stretch recovery (EC) was measured by making a skein of 10 turns on a lap reel with a frame circumference of 1.5 yards, and adding 10g, 10g, 20
The length when suspending g and 150g baby weight is l
₀ , the length when the baby weight 150g is removed is l ₄₀ ,
Further, the length when the baby weight 20 g was removed was set to l ₂₀ , and the length when the baby weight 10 g was removed was set to l ₁₀ . The stretch recovery (EC) was calculated by the following calculation. For example, EC40 (%) is

[0014]

[Equation 1]

The internal / external difference (%) was calculated by the following equation.

[0016]

[Equation 2]

In Table 1, Comparative Example 1 was dyed without overfeeding with normal cheese, Comparative Example 2 was dyed without overfeeding with heat shrink cheese, and Comparative Example 3 was with normal cheese. Shown is one that has been over-fed and stained. In any case, the difference between the inner layer and the outer layer of the winding yarn layer is large and the stretch recovery is not improved. On the other hand, in the example, the difference between the inner layer and the outer layer of the winding yarn layer is reduced due to the additive effect of the heat shrink cheese and the overfeed, and the stretch recovery property is greatly improved.

[0018]

[Table 1]

From the results shown in Table 1, in the conventional dyeing method, the difference between the inner layer and the outer layer of the winding yarn layer exceeds 15%, whereas in the dyeing method of the present invention, the difference can be suppressed within 10%. It is possible to obtain a versatile dyed stretchable composite yarn.

[0020]

EFFECTS OF THE INVENTION Since the present invention is constituted as described above, cheese dyeing can be performed by reducing the difference in stretch recoverability between the inner layer and the outer layer of the wound yarn layer of the stretchable composite yarn. It has become possible to provide a cheese dyeing method capable of efficiently producing a target yarn-dyed yarn in a short time without the need for a human operator.

[Brief description of drawings]

FIG. 1 is a perspective view of heat shrink cheese.

FIG. 2 is a perspective view of the heat-shrinkable cheese in a state where the diameter thereof has shrunk.

Claims (1)

[Claims] 1. A cheese dyeing method in which a stretchable composite yarn having spandex fiber as a core yarn and other fibers arranged around the core yarn is wound on cheese and dyed, wherein softening is started at a moist heat of 60 ° C. or higher as the cheese. A plurality of fence-shaped members, which are formed of thermoplastic and are parallel to each other in the circumferential direction, are composed of a pair of parallel longitudinal members and a plurality of leaf spring members bridging the pair of longitudinal members. Using the heat-shrinkable cheese of the structure provided, with respect to the rotation speed of the heat-shrinkable cheese, the composite yarn is wound on the heat-shrinkable cheese with the feeding speed of the stretchable composite yarn overfeeding, and dyeing. A method for dyeing cheese with a stretchable composite yarn.