JPH08199424A - Polyester monofilament package - Google Patents

Abstract

(57) [Summary] [Constitution] The fineness of the polyester monofilament is 7-
Package consisting of polyester monofilament having a denier of 40 denier and a strength at 3.0% elongation of 3.0 g / D or more, and the drum hardness of the center portion and the end portion of the package surface layer is specified. [Effect] It has an excellent unwinding property, and also has yarn drop, tarmi,
It was a package foam that did not cause thread slippage, and also improved the weavability of the polyester monofilament.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester monofilament package, and more particularly to a polyester monofilament package for screen gauze.

[0002]

2. Description of the Related Art Conventionally, synthetic fibers such as nylon and polyester multifilaments have been used for industrial materials because of their stable quality and easy availability. In particular, polyester monofilaments, which have advantages of high strength, appropriate elastic recovery rate and excellent dimensional accuracy, are widely used for screen gauze.

Conventionally, in the production of a polyester monofilament, a method has been used in which a polyester monofilament is once spun, an undrawn yarn is wound up, and then drawn using a known draw twister and wound up on a bobbin. However, in the case of bobbin winding, the winding tension at the time of winding is large and the inner layer part is tightly wound, and the pan shrinkage occurs.
The dimensional stability of the raw machine was poor, and the bobbin winding amount could not be increased, resulting in extremely low productivity.

In order to solve this problem, various methods including winding a drum have been proposed so far. For example, as a means for increasing productivity, a so-called direct-spinning and drawing method, in which a spun undrawn yarn is directly drawn and wound into a drum without being wound up, is well known and widely used as a method for producing synthetic fibers. Has been. Further, in order to provide a polyester monofilament excellent in dimensional stability, Japanese Patent Laid-Open No. 5-295617 discloses a tension imparting roller, a heating supply roller, a heating stretching roller, a non-stretching roller when a monofilament is produced by a direct spinning drawing method. A method has been proposed in which a heating roller is provided, and a stretch of 0.1% or more and 10% or less is applied between the heating stretching roller and the non-heating roller to wind it.
There is also a method in which the spun undrawn yarn is once wound and wound on a drum using a known draw winder.
This is not practical because it involves two steps of stretching and the productivity is low.

Although these methods were able to prevent the occurrence of panning, they left a serious problem in the stability of the package. JP-A-6-45426 proposes to lower the winding angle of the inner layer portion to improve the unwinding property of the drum winding. Generally, as a method for improving the unwinding property of a drum winding, the regulation of the innermost layer width of the yarn, the regulation of the winding thickness, the regulation of the winding angle, etc. are known and widely used. However, these methods including the above publication were multifilaments for clothing and industry, and were wound with a thread having low strength and low rigidity at 10% elongation. Polyester monofilament differs from polyester multifilament woven and knitted yarn for clothing in that it has a large strength at 10% elongation and a large rigidity of the yarn that cannot be wound up. Moreover, the yarn breaks frequently during unwinding. It was a monofilament package not worth.

In particular, a polyester monofilament wound around a drum is frequently slipped, has a large amount of yarn drop at the end face, and has a large amount of tarmi, which causes loop slipping during transport, resulting in frequent unraveling yarn breakage during the weaving process. Had the drawback of doing As described above, when the polyester monofilament is wound on a drum, the bunching is eliminated, but thread drop, tarmi and thread slip occur on the end surface, and a loop slip occurs at the time of transfer, making it unsatisfactory as a yarn feeding package at the time of weaving. Is the actual situation.

[0007]

SUMMARY OF THE INVENTION The present invention overcomes the above-mentioned problems of the prior art, has an excellent unwinding property, and has a yarn drop,
It is an object of the present invention to provide a polyester monofilament package having good foam stability that does not cause tarmi or yarn slippage.

[0008]

The object of the present invention described above is, in a polyester monofilament package, a polyester monofilament having a fineness of 7 to 40 denier and a strength at 10% elongation of 3.0 g / D or more. This can be achieved by a polyester monofilament package which is made of polyester monofilament and has a drum hardness of 70 to 95 at the center of the package surface layer and a drum hardness at the end of the package surface layer higher than the drum hardness of the center portion.

The polyester of the present invention is mainly made of polyethylene terephthalate consisting of terephthalic acid and ethylene glycol.
A polymer containing 2,6-naphthalate or polyethylene terephthalate as a main component can also be used. A core-sheath composite yarn of nylon and polyethylene terephthalate can also be used.

The polyester monofilament of the present invention must have a fineness of 7 to 40D, preferably 12 to 24.
The range is D. If it is less than 7D, the monofilament becomes extremely fine and the threading property and the thread forming property are deteriorated. On the other hand, if it is larger than 40D, the rigidity of the yarn itself is increased, and collective yarn drop during winding occurs frequently.

The strength at 10% elongation is an index showing the strength of the polyester monofilament, and is 3.0 g /
D or more is required, and preferably 3.5 g / D or more. When the strength at 10% elongation is less than 3.0 g / D,
This is not practical because the strength of the weaving machine during weaving becomes small.

The hardness of the polyester monofilament package according to the present invention is determined by the Japanese Industrial Standard (JSK6301).
The measuring part of the rubber hardness meter defined in (1975) is pressed against the package surface shown in FIG. 1, and the value is indicated by the pointer (hereinafter referred to as rubber hardness). The rubber hardness of the central portion is 70 to 95, and it is essential that the rubber hardness of the end portion is higher than the rubber hardness of the central portion. Preferably, the rubber hardness of the central portion is 75 to 95, and the rubber hardness of the end portions is higher than the rubber hardness of the central portion. If the rubber hardness is less than 70, yarn slippage occurs, and wheel slippage occurs during transportation, causing the drum to collapse. Also, the threading performance is poor when threading. When the rubber hardness is higher than 95, the yarn drop frequently occurs. The rubber hardness at the center of the surface layer of the package referred to here is the rubber hardness at the center of the outermost layer of the polyester monofilament package as shown in FIG. 1, and the rubber hardness at the end of the package surface layer is the polyester monofilament package. Is the rubber hardness at a position 2 mm from the end of the outermost surface layer.

Fineness of polyester monofilament, 1
There are no special requirements other than the strength at 0% elongation and the rubber hardness of the polyester monofilament package,
It is preferable that the innermost layer width of the polyester monofilament yarn is 70 to 200 mm, the yarn winding thickness is 10 to 100 mm, and the winding angle at the time of winding is 1 to 7 °.

The yarn inner layer width is the yarn winding width of the portion in contact with the core material in the innermost layer of the package. The yarn is dropped due to the bulge of the end face during winding, and the thread is unraveled or unwound at the time of unwinding. 70 to 200 mm is preferable in terms of defects. More preferably, it is 90 to 160 mm.

The yarn winding thickness is the shortest length between the core material and the outermost layer of the yarn of the polyester monofilament package, and is 10 to 10 in terms of the winding amount and the yarn drop due to the bulge of the end face during winding.
100 mm is preferable.

The traverse angle is θ shown in FIG. 2 and means the angle formed by the line of the fibers in the outermost layer of the polyester monofilament package and the line perpendicular to the longitudinal direction of the core material. From the viewpoint of unwinding property and yarn drop, 1 to 7 ° is preferable. More preferably, it is 4 to 7 °.

The polyester monofilament package of the present invention may be any one generally used for yarn feeding, and may be, for example, any of the drum of FIG. 1 (a), cheese of (b), and corn of (c). . The core material around which the monofilament is wound is not particularly specified.

The method for producing the polyester monofilament of the present invention is not particularly specified, but as shown in FIG. 3, the polyester monofilament is preheated by a heating roller which is spun from a spinneret and heated to a temperature not lower than the glass transition point, and is heated without being wound once. A method in which a monofilament is wound by drawing with a drawing roller, that is, a so-called direct spinning drawing method is preferable from the viewpoint of productivity. Of course, rollers may be installed between the die and the heating roller, and between the heating and stretching roller and the winder.

Specifically, the polyester monofilament package of the present invention has a winding speed of 1000 to 4500 m / min, a winding tension of 0.2 to 0.6 g / D, and a surface roll of the surface roll of the apparatus described above. Monofilament package contact pressure is 8 to 15 Kgw, and the distance between the fulcrum guide during winding and the drum surface layer is 2 to 5 of the yarn innermost layer width.
It can be manufactured by winding in double. Particularly preferably, the winding speed is 2000 to 4000 m / min, the winding tension is 0.2 to 0.5 g / D, the contact pressure of the monofilament package of the surface roll is 10 to 13 Kgw, and the fulcrum guide during winding and the drum surface layer. Is 2.5 to the innermost width of the yarn
It is preferable to wind at 4 times. The take-up speed is in terms of winding time and yarn-forming property, the take-up tension is in terms of yarn hooking property, yarn slippage, slipping out during transportation, and yarn drop.The contact pressure of the monofilament package on the surface roll is yarn slippage and yarn drop. In terms of the distance, the distance between the fulcrum guide during winding and the surface layer of the drum is preferably in the range described above in terms of scratching of the yarn surface and the spinnability.

The method of driving the winding machine when manufacturing the polyester monofilament package is not particularly limited, but a method in which the surface roll is driven in the winding machine of FIG. 3 is preferable, and more preferably the spindle. A method that can positively drive the surface roll during driving to reduce the tension in the outermost layer of the package is preferable.

[0021]

EXAMPLES The present invention will be described in detail below with reference to examples. A. Strength at 10% elongation Using a Tensilon tensile tester, a tensile elongation curve (strong elongation curve) was determined at a sample length of 200 mm, a tensile speed of 200 mm / min, and a chart speed of 300 mm / min. The value obtained by dividing the strength at 10% elongation by the fineness was defined as the strength at 10% elongation. 3.0
The value of g / D or more is a value practically usable as a monofilament.

B: Rubber Hardness of Monofilament Drum Package The rubber hardness is Japanese Industrial Standard (JSK6301-1975).
The value indicated by the pointer is obtained by pressing the measuring portion of the rubber hardness meter specified in 1 above onto the package surface as shown in FIG.

C: Unwinding A polyester monofilament package was unwound at a speed of 6
It was measured by the number of yarn breakages and the number of times of threading that occurred when unwinding at 00 m / min and the unwinding distance of 30 cm. ◯ Δ is the target level of the present invention. ◯: No thread breakage, single thread breakage at all Δ: 0 <thread breakage, single thread breakage frequency (times / Kg) ≦ 2 ×: thread breakage, single thread breakage frequency (times / Kg)> 2

D: Thread slip and thread drop Thread slip was visually determined on the surface layer of the polyester monofilament package, and thread drop was visually determined on the end surface of the package. ◯ Δ is the target level of the present invention. ◯: No thread slippage, no thread slippage △: Single thread thread slippage, no thread slippage ×: Aggregate thread dropout (two or more threads dropout simultaneously), no thread slippage × ×: Thread slippage

E: Threading property Judgment was made by the success rate at the time of threading. ◯ Δ is the target level of the present invention. ◯: 90% ≦ threading success rate Δ: 75% ≦ threading success rate <90% ×: 50% ≦ threading success rate <75% XX: threading success rate less than 50%

F: Take-up tension Measured on the fulcrum guide between the hot-drawing roll and the winder in the direct spinning / drawing apparatus shown in FIG.

G: Spinnability Evaluation was performed by the number of yarn breakages when the polyester monofilament package of 100 kg in total was wound by the direct spinning and drawing apparatus shown in FIG. ◯ Δ is the target level of the present invention.

◯: No thread breakage Δ: Thread breakage 1 to 4 times ×: Thread breakage 5 times or more

Example 1 Granular polyethylene terephthalate having an intrinsic viscosity of 1.0 measured with an o-chlorophenol solution at 35 ° C. was extruded from a spinneret having 4 holes at a spinning temperature of 302 ° C., solidified by cooling,
The oil agent is applied by an oiling roller, and the undrawn yarn that has passed through the stretch roll 3 is preheated by the heating take-up roller 4 heated above the glass transition point without being once wound by using the direct spinning and drawing apparatus shown in FIG. Without taking, the monofilament was wound by stretching with the heating stretching roller 5. The cam traverse method was used for winding. The amount of oil adhered to the yarn was 0.3%, and the friction coefficient of the yarn-specular yarn was 0.27 to 0.28 μd. The contact pressure of the monofilament package on the surface roll was 10 Kgw, and the distance between the fulcrum guide during winding and the drum surface layer was 3 times the width of the innermost layer of the yarn. The conditions of the direct spinning and drawing apparatus are as follows.

Experiment No. 4, 8, 10 to 22 speed of heating take-up roller 4 at 525 m / min, temperature of 92 ° C. speed of heating stretching roller 5 at 2310 m / min, temperature of 130 ° C. 24 Heat take-up roller 4 speed 920 m / min, temperature 92 ° C Heat draw roller 5 speed 3960 m / min, temperature 130 ° C 2 Heat take-up roller 4 speed 910 m / min, temperature 92 ° C. Heat draw roller 5 speed 3600 m / min, temperature 130 ° C. 3 Heat take-up roller 4 speed 861 m / min, temperature 92 ° C. Heat draw roller 5 speed 3600 m / min, temperature 130 ° C. 5 Heat take-up roller 4 speed 645 m / min, temperature 92 ° C Heat draw roller 5 speed 3000 m / min, temperature 130 ° C

Comparative Example Granular polyethylene terephthalate having an intrinsic viscosity of 1.0 measured with an o-chlorophenol solution at 35 ° C. was extruded from a spinneret having 4 holes at a spinning temperature of 302 ° C. and solidified by cooling.
The oil agent is applied by an oiling roller, and the undrawn yarn that has passed through the stretch roll 3 is preheated by the heating take-up roller 4 heated above the glass transition point without being once wound by using the direct spinning and drawing apparatus shown in FIG. Without taking, the monofilament was wound by stretching with the heating stretching roller 5. The contact pressure of the monofilament package on the surface roll was 10 Kgw, and the distance between the fulcrum guide during winding and the drum surface layer was 3 times the width of the innermost layer of the yarn. The conditions of the direct spinning and drawing apparatus are as follows.

Experiment No. 1 Cam traverse method Oil content 0.3% Thread-mirror surface running thread friction coefficient 0.28 μd Heat take-up roller 4 speed 1000 m / min, temperature 92 ° C. Heat draw roller 5 speed 3600 m / min, temperature 130 ° C. ・ Experiment No. ． 6 Cam traverse method Oil adhesion amount 0.3% Yarn-mirror surface running yarn friction coefficient 0.27 μd Heat take-up roller 4 speed 600 m / min, temperature 92 ° C Heat draw roller 5 speed 3000 m / min, temperature 130 ° C ・ Experiment No. ． 7,23 Cam traverse method Oil content 0.3% Thread-mirror surface traveling thread friction coefficient 0.28 μd Heat take-up roller 4 speed 525 m / min, temperature 92 ° C. Heat draw roller 5 speed 2310 m / min, temperature 130 ° C. Experiment No. 9-blade traverse method Oil content 0.3% Thread-mirror surface running thread friction coefficient 0.28 μd Heat take-up roller 4 speed 525 m / min, temperature 92 ° C. Heat draw roller 5 speed 2310 m / min, temperature 130 ° C.

[Table 1] In all experiments, the strength at 10% elongation is 3.0 g
/ D or more, which was a practical value as a polyester monofilament for screen gauze. Experiments 2-5,
8, 10-22, 24 reach the object of the present invention. Other experiments cannot achieve the object of the present invention for the following reasons.

In Experiment 1, the fineness of the polyester monofilament is less than 7D, and the threading property and the spinnability are not at a satisfactory level. In Experiment 6, when the fineness of the polyester monofilament is larger than 40D, the yarn drop is not at a satisfactory level.

In Experiment 7, when the drum hardness of the central portion of the polyester monofilament package is less than 70, the yarn drop and yarn slippage are not at a satisfactory level. Further, the winding tension during the production of the polyester monofilament is less than 0.2 g / D, and the yarn drop and yarn slippage are not at a satisfactory level. Experiment 9
Is the yarn drop when the drum hardness at the end of the polyester monofilament package is lower than the drum hardness at the center,
Unwinding is not at a satisfactory level. In Experiment 23, when the drum hardness of the central portion of the polyester monofilament package is greater than 95, the yarn drop and yarn slippage are not at a satisfactory level. Further, when the winding tension at the time of producing the polyester monofilament is larger than 0.6 g / D, the yarn drop and the yarn slippage are not at a satisfactory level.

[0035]

According to the present invention, a polyester monofilament package can be provided with excellent package form and unwinding property, and the weavability of the polyester monofilament can be greatly improved.

[Brief description of drawings]

FIG. 1 is a drawing showing a specific example of a polyester monofilament package of the present invention.

FIG. 2 is a diagram showing a winding angle in the polyester monofilament package of the present invention.

FIG. 3 is an apparatus for explaining a direct spinning and drawing method that can be preferably used in the present invention.

[Explanation of symbols]

 1: Clasp 2: Lubricant application device 3: Stretch roll 4: Heated take-up roller 5: Heated draw roller 6: Swing support guide 7: Winding machine 8: Surface roll 9: Spindle

Claims (4)

[Claims] 1. A polyester monofilament package, wherein the polyester monofilament has a fineness of 7 to 40 denier and a strength at 10% elongation of 3.
It is composed of polyester monofilament of 0 g / D or more, and has a drum hardness of 70 to 9 at the center of the package surface layer
5, and the polyester monofilament package in which the drum hardness at the end of the package surface layer is higher than the drum hardness at the center. 2. The polyester monofilament package according to claim 1, wherein the polyester monofilament yarn innermost layer width of the package is 70 to 200 mm. 3. The polyester monofilament package according to claim 2, wherein the polyester monofilament yarn winding thickness of the package is 10 to 100 mm. 4. The polyester monofilament package according to claim 3, wherein the outermost layer of the polyester monofilament package has a winding angle of 1 to 7 °.