JPH04228639A - Preparation of warp of polyester yarn - Google Patents

Abstract

PURPOSE:To provide a warp yarn enabling stable weaving of a woven fabric of a polyester yarn spun at an ultra-high speed and having low boiling-water shrinkage without lowering the productivity of the fabric. CONSTITUTION:Warp of polyester yarn is prepared by contacting a polyester yarn having a boiling-water shrinkage of <=7% with a roller in the form of a sheet and carrying out the hot-melt sizing of the yarn.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention involves hot-melt sizing polyester yarn with a low shrinkage rate in boiling water and using it as the warp yarn.
The present invention relates to a warp preparation method that enables stable weaving and provides high-quality fabrics at low cost.

0002

[Prior Art] Fabrics using polyester yarns spun and wound at ultra-high speeds for the warp and/or weft have the advantages of having a soft texture, high dimensional stability, and resistance to wrinkles. We can provide textiles. In addition, mixed woven fabrics have the advantage of not impairing the characteristics of other materials.

[0003] Polyester yarns spun and wound at ultrahigh speeds are therefore used in a wide variety of textiles, and are produced on shuttle looms, rapier looms, jet looms, and the like. on the other hand,
In recent years, many technological developments have been proposed to reduce the production cost of textiles. The non-sizing technique, which is one of the cost rationalization measures in the warp preparation process, is a well-known technique. It is woven in a jet loom without gluing, giving convergence by air entanglement of ~50 pieces/m.

[0004] However, because polyester yarn is wound at ultra-high speed, it is difficult to provide the necessary number of entanglements during weaving, so it has traditionally been weaved by attaching a general sizing agent to it. is the current situation. As another method for cost rationalization in the warp preparation process, many hot melt sizing techniques that do not require drying have been proposed.

However, this method has a problem in that it is difficult to uniformly adhere the sizing agent to the warp yarns and to penetrate the inside of the warp yarns. As a result of the inventors' investigation into the cause of this, the sizing method involves heating and melting the sizing agent, adhering it to the warp threads, and solidifying at room temperature. It was found that the penetration of the agent between single fibers was inhibited. Therefore, conventional warp preparation methods using hot melt sizing have not been able to provide warps that enable more stable weaving.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to solve these problems and provide a warp yarn that can be stably woven using polyester yarn with a low boiling water shrinkage rate.

[0007]

[Means for Solving the Problems] The present invention is a method for preparing warp yarns of polyester yarn, which is characterized in that polyester yarn having a boiling water shrinkage rate of 7% or less is brought into contact with a roller in sheet form for hot melt sizing. . The boiling water shrinkage rate in the present invention is defined in JIS L 1073-1965.
This refers to the value measured for the single fibers that make up the yarn according to method B.

The polyester thread used in the present invention consists essentially of polyethylene terephthalate and is obtained by a known polymerization method, but it may be combined with other third components as long as it does not impair the purpose of the present invention. Polymers can also be used. Further, there is no particular restriction on the degree of polymerization as long as it is within the range for normal fiber formation. Furthermore, the polyester yarn used in the present invention may contain additives used in ordinary polyester yarns, such as matting agents, stabilizers, ultraviolet absorbers, antistatic agents, and the like.

The polyester yarn used in the present invention has a boiling water shrinkage rate of 7% or less, preferably 6% or less, more preferably 3% or less.
% or less, either long fibers or spun yarns can be applied.
The spin take-up method involves spinning and winding at an ultra-high speed of over 4,000 m/min, the spin draw take-up method performing spinning-drawing-winding in a series of processes at over 4,000 m/min, and the conventional spinning and winding method. It is then obtained by a method of spreading the flame, rolling it up, and heat-setting it again. From the viewpoint of the texture of the fabric and the productivity of the yarn, it is preferable to use a polyester yarn having a boiling water shrinkage rate of 7% or less obtained by a spin take-up method or a spin draw take-up method.

[0010] In hot melt sizing, usually 60~
A relatively high viscosity sizing agent heated and melted at 90° C. is applied to the warp threads. Therefore, if the shrinkage of the warp yarns is large, the warp yarns will contract when they come into contact with the sizing agent, and will shrink before the sizing agent penetrates, increasing the bundled state of the warp yarns, resulting in poor permeability between single fibers and the sizing agent. Most of it is attached only to the surface of the warp threads. the result,
The cohesive force required for weaving, that is, the ability to bond single fibers together using a sizing agent, is not sufficient. Furthermore, if the amount of sizing agent applied is increased in order to increase the cohesive force, the sizing agent will fall off during weaving, resulting in a deterioration in weaving.

However, when the shrinkage rate is low (7% or less), even when the warp yarns come into contact with the heated and melted sizing agent, the spaces between the single yarns that the warp yarns had before sizing are maintained as they are, and the sizing agent penetrates. Sexuality improves. Therefore, it was discovered that warp yarns with excellent binding power could be obtained, and the present invention was developed. Hot melt sizing as used in the present invention refers to a method in which a polymer or polymer/wax-based sizing agent is heated and melted, adhered to the warp threads, and solidified at room temperature.

Examples of the polymer of the sizing agent used in the present invention include acrylic ester copolymers, water-soluble polyesters having sulfonic acid, phosphoric acid, carboxylic acid groups, etc. in the molecule, ethylene-acrylic acid copolymers, Ethylene-
Examples include methacrylic acid copolymers, which may be used alone or as a mixture. Examples of wax agents include synthetic waxes of partial or complete esters of fatty acids such as lauric acid and palmitic acid and acetyl alcohol and stearyl alcohol; natural waxes such as carbana wax, montan wax, and beeswax; or polyethylene; Examples include aliphatic low molecular weight compounds such as polypropylene alone or in mixtures.

[0013] The present invention is characterized in that polyester yarn having a boiling water shrinkage rate of 7% or less is subjected to hot melt sizing using a roller touch method in the form of a sheet. The binding force of the warp yarns obtained in the present invention can be stabilized by uniformly adhering the warp yarns in the longitudinal direction, so it is preferable to use two or more rolls for sizing, as shown in FIG. And furthermore,
It is also possible to use the same sizing agent used in the first roller on the second roller to re-adhere it to the yarn surface to make it uniform. It is also possible to use a different sizing agent, such as a sizing agent that has the function of further imparting smoothness necessary during weaving.

In addition to the positional relationship between the first roller and the second roller shown in FIG. 1, the sizing agent may be applied from both sides of the sheet. In short, by using two or more rollers, more uniform adhesion of the sizing agent is possible, and warp threads with uniform cohesiveness and smoothness necessary for weaving can be provided. Textile structure to which the present invention can be applied,
There are no particular restrictions on the basis weight, and any weaving conditions may be used as long as they are normally used for polyester yarns.

Next, the present invention will be explained in more detail with reference to Examples.

[0016]

【Example】

[0017]

[Example 1] 50 d/min with a boiling water shrinkage rate of 2.6% obtained using a spin take-up method with a winding speed of 7000 m/min.
1200 24f polyester multifilament yarn
A TW-N type warper manufactured by Tsudakoma Kogyo Co., Ltd., which is in the form of a book sheet and has two hot rolls with a diameter of 100φ, is made of ethylene-methacrylic acid copolymer and α-olefin, and the ratio is 45. :55 hot melt adhesives are shown in Table 1.
Gluing was carried out under the conditions shown below.

[0018]

[Example 2] The same sizing agent as in Example 1 was applied to 1,200 sheets of 50d/24f polyester multifilament yarn used in Example 1 using only one hot roll in the warper used in Example 1. Gluing was performed under the conditions shown in Table 1.

[0019]

[Example 3] 5 with a boiling water shrinkage rate of 6.5% obtained using a spin draw take-up method with a winding speed of 5200 m/min.
A 0d/24f polyester multifilament yarn was pasted under the same conditions as in Example 1.

[0020]

[Example 4] Polyester single fiber denier 2 obtained by spin take-up method with winding speed of 7000 m/min
d, twist coefficient 4.3 using fiber length 51 mm, boiling water shrinkage rate 0
．． The spun yarn 35'S of No. 6 was sized using the same warper and the same sizing agent used in Example 1 under the conditions shown in Table 1.

[0021]

[Comparative example]

[0022]

[Comparative Example 1] 50d/24 with a boiling water shrinkage rate of 7.8%, spun at a winding speed of 1500 m/min, then stretched, twisted and wound.
The polyester multifilament yarn f was pasted under the same conditions as in Example 1.

[0023]

[Comparative Example 2] The 50d/24f polyester multifilament yarn used in Comparative Example 1 was glued under the same conditions as in Example 2. As described above, the sizing yarns of four examples and two comparative examples were evaluated by the following method. (1) Conjugation power a. Measuring device: TM conjugation force tester b. Load on thread: 0.3g/d c. Friction speed: 120 times/min. Number of friction: 1000 times E. Number of yarns evaluated: 35 (2) Determine whether or not glue adheres to the reed of the TM binding force tester that evaluated the glue binding force (3) Overall judgment ◎: No thread breakage, no fluff, and no glue removal. unacceptable(
very good).

○: No yarn breakage, less than 5 fluffs, and no sizing observed (good). ×: Thread breakage is observed, and 5 or more fuzzes are observed and desizing is also observed (poor). The evaluation results are shown in Table 2. As shown in Table 2, in the examples, there was no yarn breakage, the occurrence of fluff (nep generation in the case of spun yarn) was less than 5, and the binding force was excellent, and there was no sizing, and a good warp yarn could be provided. .

[0025]

[Table 1]

[0026]

[Table 2]

[0027]

Effects of the Invention According to the present invention, by hot-melt sizing the low-shrinkage polyester yarn, the sizing agent has good permeability between the single fibers, excellent binding power, and stable weaving without the drawback of sizing. We can provide warp threads that allow for

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an example of a method for preparing warps of polyester yarn according to the present invention.

[Explanation of symbols]

1 Sheet-like polyester yarn 2 First sizing roll 3 Second sizing roll 4 Guide roll 5 Winding beam

Claims (1)

[Claims] 1. A method for preparing warp yarns of polyester yarn, which comprises hot-melt sizing polyester yarn having a boiling water shrinkage rate of 7% or less by bringing it into contact with a roller in sheet form.