JPS61245307A - Production of specific filament of polyester - Google Patents

Abstract

PURPOSE:To obtain in improved productivity the titled product having large size, high strength and high elongation, suitable as nets, etc., by spinning a molten polyester polymer from a spinneret having holes brought into a line and treating formed filaments by a specific direct spinning and drawing of air cooling type. CONSTITUTION:Firstly, molten polyester having 0.85-1 intrinsic viscosity is spun from the holes 3 brought in a line on the spinneret 1 and primary cooling is carried out while blowing cooling air upon filaments in the R direction from a chimney having a constant distance between each single yarn forming the prepared filaments Y and the face blowing the cooling air. Then, the filaments Y are provided with emulsion of a finishing oil having >=85wt% water content by the oiling roller 5, oil supply and secondary cooling are simultaneously carried out and the temperature of the filaments Y is made <= the glass transition temperature. Finally, the filaments Y are preheated, drawn at multiple stage, relaxed and wound round the bobbin 11 having the surface coated with a synthetic film or Al without crossing each single yarn.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a method for producing a special polyester filament, and more specifically, it is used for a net with a few strands of mesh like cheesecloth used on fruit trees and tea plantations. The present invention relates to a method for producing a special polyester filament that can be preferably used.

Furthermore, the present invention has a single yarn Denny ρ which is preferably used for the above-mentioned net, and has a large diameter of &0 to 150d.
Manufacture a special untwisted polyester filament that has high strength and high elongation performance with a breaking strength of a8 Gg/d or more and a breaking elongation of lao% or more, and can be divided into filaments with a number of single yarns of 6 to 32. It is about the method.

Polyester filaments, typified by polyethylene terephthalate, have excellent properties and are widely used in applications such as clothing and general industrial materials. Among these, in general industrial applications in particular, it is used as reinforcing fibers in reinforcing elastic structures such as tire cords, various belts, and hoses, seat belts, fishing nets, etc.
It is used for tents, nets, slings, etc., and in recent years polyester μ single yarn thick denier monofilament has been developed for use as nets such as cheesecloth and windproof nets that are used outdoors for long periods of time.

<Prior Art> Conventionally, when manufacturing single polyester large diameter μ monofilaments, the water-cooled direct spinning and drawing method has been most commonly employed. That is, the spun filament discharged from the spinneret is immediately introduced into water, the yarn temperature of the spun filament is lowered to below the glass transition point, and then immediately heated.
In this method, the material is heat-treated, stretched, and relaxed using a stretching roller group and relaxing rollers, and then wound onto a bobbin. This method is a direct spinning and drawing method, so the process is simple, but since water is used for cooling, water adheres to the filament at the time of starting or threading when the thread breaks midway, so it is difficult to use a suction gun, etc. Workability is poor because the threading tool cannot be used. In addition, since the water resistance is large, when the yarn speed increases, the yarn does not drain evenly, making it impossible to draw or causing uneven quality. Therefore, the winding speed is 100-20
Generally, the speed is 0 m/min, and the productivity is quite low, making it impossible to efficiently produce large quantities.

On the other hand, polyester multifilament (e.g. 150
0 deni-Iv288 filament, 1260 deni-71
zlQ13 filament] and multifilaments for fishing nets (e.g. 420 denier A/48 filament, 210 denier A/24 filament)
In the case of thin filaments of 5 deni p or less, the air-cooled direct spinning and drawing method is applied;
The thick filament called Denny has defects such as inter-filament fusion and uneven quality.Furthermore, the filament slips on the surface of the bobbin, making threading impossible and having to use the can storage method. It also has drawbacks in productivity and has not been put into practical use.

Problems to be Solved by the Present Invention> The problem with the prior art described above is the limit in speeding up the water-cooled direct spinning/drawing method when producing polyester special filaments with a single filament denier of 50 denier or more. This impedes productivity improvement, deteriorates quality due to uneven drainage, uneven quality due to fusion between filaments in air-cooled direct spinning/drawing method, and poor productivity and workability due to inability to thread thread onto the bobbin. There is a particular thing.

The object of the present invention is to solve the above-mentioned drawbacks of the prior art, and to solve the problems of the above-mentioned prior art by using an air-cooled direct spinning and drawing method to achieve a single yarn Denny μ of 504 to 15.
The object of the present invention is to provide a method for producing a special polyester filament with high strength and high elongation consisting of 0d.

Means and operation for solving the problems> The structure of the present invention is to spin a molten polyester polymer having an intrinsic viscosity (L85 to t00) into a filament from a spinneret having holes arranged in a row, and to form the filament. Primary cooling is performed by blowing cold air from a chimney with a substantially constant distance between each single yarn and the cold air blowing surface, and then the water content is 85%.
After applying an oil emulsion of 51 or more and performing oil supply and secondary cooling at the same time to bring the temperature of the filament to below the glass transition point, each single yarn is preheated and multi-stage stretched without crossing each filament. and a method for producing a special polyester filament, which is subjected to a relaxation treatment and wound onto a bobbin whose surface is coated with a synthetic film or aluminum.

The polyester constituting the special polyester filament of the present invention is a dicarboxylic acid component such as terephthalic acid, isophthalic acid, naphthalene dicarboxylic acid, 4,4'-diphenyl dicarboxylic acid, adipic acid, ethylene glycol, propylene, etc. Contains 96% by weight or more of thermoplastic polyester formed by polycondensation of diol components such as glycol, 1-4 butanediol, and neopentyl glycol, specifically polyethylene terephthalate, poly(ethylene 1.2- Diphenoxyethane-4-4'-cica μ boxyclate), polyethylene naphthalate V-t #, and copolymerized polyester μ formed by combining these components are mentioned, but in particular, 85 mo/I/96 or more of the repeating units are ethylene. Preference is given to homopolymers or copolymers of terephthalate.

In addition, the breaking strength and breaking elongation of polyester special filament are both (J Engineering!) L1017-11978 (
Based on the description of Japanese Industrial Standards Chemical Fiber and Tire Cord Test Methods P1 to 5, Tffr 100 BALDWIN O LTD.
@TENSIT, +ON/UTM -4-100
This value was measured using a yarn length of 250 m/min and a tensile speed of 500 m/min.

The present invention will be specifically explained below.

All drawings are schematic diagrams of the apparatus according to the method of the present invention,
FIG. 1 is a front view of the air-cooled direct spinning/drawing apparatus, and FIGS. 2 to 4 are plan views showing the hole arrangement of the spinneret.

A molten polyester polymer having an intrinsic viscosity (L85 to 1.00) is spun out from holes 5 provided in the spinneret 2 of the spinning tower 1, and is primarily cooled in the air cooling zone 4. A value within the range of 52 is desirably selected depending on the required number of filaments.

If the intrinsic viscosity of the polyester is less than αB5, a yarn with high strength and high elongation cannot be obtained. If it exceeds 1.00, the luminescence will deteriorate and single filament breakage will occur frequently during the drawing process.

In addition, if the number of holes 3 in the spinneret 2 is small, productivity will be poor and cost benefits cannot be expected when fiber separation in the subsequent process is taken into account. 4. As shown in Figure 4, the arrow R in the cooling zone 4 of each single filament forming a single filament array is shown in Figure 4.
The cooling rollers are cooled by cold air blown in almost the same direction, and run in parallel on the oiling roller 5S, the take-up roller group 6, the preheating lobe group 7, the first stretching roller group 8, the second abrasive roller group 9, and the relaxing roller group 10. In order to prevent entanglement and crossover, these cooling sheaths 74, oiling lobes 5, and each roller group 6 to 10 must be made large.
In particular, increasing the length of the lobe groups 6 to 10 is not preferable because it involves high-speed rotation and is extremely unsafe. The roller groups 6 to 10
If the length is not increased, each single yarn forming the filament τ will be entangled or crossed on these roller groups 6 to 10, resulting in single yarn breakage during fiber separation in the subsequent process. Therefore, the number of holes 5 in the spinneret 2 is 6.
-32 is preferable, and 12-25 is more preferable.

The diameter of the holes 5 of the spinneret 2 is preferably 0.9 to 2.5. (When L8 or less, the draft rate becomes small and the round luminosity deteriorates; when it exceeds 1Om, the back pressure of the spinneret 2 decreases, and in this case also the luminosity deteriorates.

In addition, the discharge amount per hole 3 of spinneret 2 is &5 g/
When it is less than min, it is not possible to obtain a drawn yarn with a single yarn Denny A150 a or more and a strength of a 8g/α or more, and
When the discharge amount per hole 5 exceeds 24.0 g/win, the single yarns may be fused on the surface of the take-up roll 6,
Subsequent stretching may become impossible. In addition, here, it is preferable that the spinneret with arrayed holes has a hole distribution with a gap S between the holes of 2.0111 or more when viewed from the cooling air blowing direction, and by setting it to 22-0s or more, it is possible to The cooling unevenness of the yarn is reduced, and fusion between single yarns occurs on the take-up rope group 6.
As it becomes thicker, the splitting property improves.

The filament τ spun from the hole 3 is cooled by cold air blown in the direction of the arrow R in the cooling zone 4, and brought into contact with an oiling row /I/ to apply an oil emulsion with a moisture content of 85% or more. Secondary cooling is performed to lower the temperature of the filament Y to below the glass transition point.

When the water content of the oil emulsion is less than 85%, the filaments are not sufficiently cooled by the heat of the water, which is undesirable because fusion between the filaments tends to occur on the take-up roll. The water content of the oil emulsion is preferably 90%.
As described above, the cooling effect is further improved.

The filament τ to which the oil emulsion has been applied is wound around a take-up roll group 6, and then the filament τ is wound around a preheating roll group 7 and heated to a temperature equal to or higher than the glass transition point. It is wound around a stretching roll group B, and stretched once to 4.1 to 48 times, and then immediately wound around a heated second stretching row μ group 93 and a relaxation roll group 10, and subjected to heating stretching and relaxation treatment.

Here, when the first stage magnification is less than 4.1 times, Worcester's spots become large and yarn breakage occurs frequently in the fiber splitting process.

Moreover, when the number exceeds 4 or 9 times, single yarn breakage may occur on the first and second drawing roller groups 8 and 9.

The filament that has been subjected to the stretching and relaxation treatment described above is wound onto a bobbin 11 whose surface is coated with synthetic film or aluminum.

The synthetic film wound on the bobbin 11C is made of polyethylene,
PVC chloride, nylon, cellophane, etc. are preferably used. When a normal bobbin is used for winding the filament τ, each single yarn forming the filament Y is thick and cannot be wound by sliding on the surface of the bobbin 110 due to the rigidity of each single yarn. As a result of various studies, the surface of the bobbin 11 is coated with a synthetic film or aluminum foil to increase the frictional resistance between the surface of the bobbin 11 and the filament, thereby preventing slippage. The filament τ is a filament because the innermost layer wound on the bobbin 11C presses a synthetic film or aluminum foil to deform it into a waveform, and a part of the filament τ is buried in the recess of the waveform. It is presumed that by increasing the contact area between the surface of τ and the surface of the bobbin 11, that is, the synthetic film and aluminum foil wrapped around the surface of the bobbin 11, it was possible to wind the highly rigid thick denier filament Y. be done.

<Example> Example 1 Using the apparatus shown in Fig. 1, a polyester polymer with an intrinsic viscosity r: L90 was prepared with 15 holes and a hole diameter of 1.5 w.
The spun filament was spun at a rate of 1 a 5 g/min per single hole from a spinneret with a single row of holes shown in FIG. After contacting and applying an oil emulsion with a water content of 9596 and cooling the temperature of the filament to 70°C, the filament was wound around a group of take-up rollers rotating at a surface speed of 460 m/min, and then heated to 100°C. It was then wound around the first heated drawing lobe rotating at a surface speed of 197 Q m/min, stretched 4.5 times, and immediately heated to 220°C, with a surface speed of 2270 m/m.
The film was wound on a second heated stretching roller of 100 m/in, and then wound on a relaxation treatment roller with a surface speed of 2200 m/win.
Further, a bobbin whose surface was coated with a synthetic film was wound up.

The obtained filament has no single filament breakage, entanglement or crossover, and can be separated extremely smoothly in the subsequent process, improving workability, productivity, and quality. /''s elongation was 22.7*, and single yarn denier was 75a.

Example 2 Intrinsic viscosity of polyester 185-100. Number of cap holes: 6~
32. Pore diameter cL80~5011II, discharge amount &3~24
0, the moisture content of the oil emulsion was 85 to 9896, and the first stretching ratio was 4.1 to 4.8, with the other conditions being the same as in Example 1. Denier polyester special filament obtained.

All of the polyester filaments obtained had high strength and high elongation, with no single filament breakage, and could be split into filaments and used as monofilaments.

Comparative Examples Various polyester filaments were experimentally produced by omitting one or two of the conditions shown in Example 2 above. During trial production, most of the filaments that were round and had poor weight, had frequent single filament breakage, were unable to be drawn, and had large irregularities in strength and elongation in the length direction could be used for practical use. It wasn't something.

<Effects of the invention> Conventionally, large fibers with a thickness of 50 to 150 d.
``It was believed that polyester filaments could not be manufactured by the air-cooled direct spinning method, but by satisfying each component of the present invention (c), it became possible to manufacture polyester filaments, which made it possible to speed up production and significantly improve productivity. At the same time, the quality of the obtained polyester filament is extremely homogeneous, and there is no breakage of single filaments when the fibers are separated and woven into nets, which improves productivity, and the resulting nets and other products are also of high quality and quality. I was able to do it.

[Brief explanation of drawings]

The drawings are all schematic diagrams of the apparatus according to the method of the present invention, and FIG. 1 is a front view of the air-cooled direct spinning and drawing apparatus, and FIGS. 2 to 4 are plan views showing the row of holes in the spinneret. 1... Spinning bath 2... Spinneret 5... Hole 4... Cooling area 5... Oiling roller 6... Take-up roller group 7... Preheating roller group 8... First stretching roller group 9... Second stretching roller group 10... Relaxing roller group 11 ・1st gear... Bobbin

Claims (1)

[Claims] A molten polyester polymer having an intrinsic viscosity of 0.85 to 1.00 is spun into a filament through a nozzle with holes arranged in a row, and the distance between each single yarn forming the filament and the cold air blowing surface is kept approximately constant. Primary cooling is performed by blowing cold air from the chimney, and then an oil emulsion with a moisture content of 85% or more is applied to perform oiling and secondary cooling at the same time to bring the temperature of the filament to below the glass transition point. Thereafter, each single filament is subjected to preheating, multistage stretching and relaxation treatment without crossing each other, and then wound onto a bobbin whose surface is coated with synthetic film or aluminum.