JPS6319634B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for efficiently producing stranded synthetic resin wires that are evenly twisted and have excellent strength and durability.

Synthetic resin filaments are less likely to rust or break than metal filaments or ropes, and are attracting attention as a highly durable material. It is difficult to remove and store it, and it must be stored in a long length, which poses various problems in terms of transportation and handling during use.

On the other hand, a stranded wire made by twisting together multiple synthetic resin filaments, such as the one shown in Figure 1, has greater strength and flexibility than a single filament having the same wire diameter. Therefore, it can be rolled up and stored, and is expected to be applied to a wide range of applications. However, twisting wires made of crystalline thermoplastic resins such as thermoplastic polyester and polyamide with relatively large diameters not only requires a considerable amount of force, but also depends on the material's crystallinity, heat shrinkability, and hardness. Due to incidental requirements such as, for example, cracks may occur in a part of the linear material as shown in Figure 2, or the twisted state may become uneven as shown in Figure 3. It is difficult to produce stranded wire with good strength.

Therefore, the present inventors developed a filament made from thermoplastic polyester and/or polyamide.
As a result of our research aimed at efficiently manufacturing stranded wire with uniform twisting and excellent strength and durability, we found that:
The inventors have discovered that the above object can be effectively achieved by placing a plurality of filaments under tension and selecting conditions that cause twisting and heat fixation to occur simultaneously, resulting in the present invention.

That is, when manufacturing a stranded wire by twisting together a plurality of filaments made of thermoplastic polyester and/or polyamide and having a wire diameter of 1.0 to 4.0 mm, the present invention provides the following method: Pull out the unstretched filament under tension,
The synthetic resin burning wire is passed through a heating device controlled at a temperature above the glass transition temperature and below the melting point of the filament material to cause substantial twisting and heat fixation, and then rapidly cooled. The present invention provides a method for manufacturing.

The filament used as the material for the stranded wire in the present invention is a monofilament made of thermoplastic polyester or polyamide and having a fairly large wire diameter.
The thermoplastic polyesters mentioned here include polyethylene terephthalate, polybutylene terephthalate, and copolyesters mainly composed of these, and the polyamides include nylon 6, nylon 66, nylon 610, and copolyamides mainly composed of these. , these can be blended with each other into filaments, and also
Furthermore, it is also possible to twist filaments made of different types of polymers.

The wire diameter of the filament used is 1.0 to 4.0 mm, especially 1.5
~3.5mm is appropriate; if the wire diameter is less than 1.0mm, the strength of the stranded wire obtained will be poor; if the wire diameter is 4.0mm or more, it will be difficult to obtain a stranded wire with even burnability even with the method of the present invention. This is not desirable because it becomes

These filaments can be manufactured according to the usual method for manufacturing monofilaments by melt extrusion spinning, but it is important that they be subjected to the stranded wire manufacturing process in a stretched and unfixed state. When using a drawn filament, not only is it not possible to obtain a stranded wire with great strength, but there is also the problem that it stretches and deforms when tension is applied after twisting. This is not preferable because the power required for twisting becomes large and the filament is likely to crack. Therefore, it is preferable that the filamentous material used as the raw material is usually stretched approximately 2 to 6 times and subjected to twisting in an unfixed state.

Next, the method for manufacturing the synthetic resin combustion wire of the present invention will be explained in detail with reference to the drawings.

FIG. 4 is a schematic diagram of the manufacturing process of the stranded wire of the present invention, and FIG. 5 is a plan view of the bobbin mounting plate 1.
According to the process shown in Figs. 4 and 5, 3
Stranded wire is produced by twisting together the filaments of books.

First, three bobbins 3, 3',
3'', the filament 4 is pulled out under tension. At this time, since the bobbin 3 is held by the bobbin support 2 with a brake as required, by controlling the winding speed of the stranded wire winding roll 11, The tensioned state of the filament 4 and the stranded wire 5 is maintained.The filament 4 pulled out in the tensioned state begins to be twisted together near the guide tube 7 of the hood 6 due to the rotation of the bobbin mounting plate 1; At this point, the falsely twisted wire 5 has asymmetrical twists and has a large restoring force to the filament.

However, by passing the levered false strands 5' under tension through the heating device 8, a substantially strong stranding and heat setting occurs. The heating device 8 is controlled in a heating atmosphere by, for example, an infrared heater 9, and the false twisted wire 5' in the heating device
The appropriate passing speed is 0.5 to 10 m/min and the heating time is 20 to 200 seconds. Note that the temperature in the heating device is preferably higher than the glass transition temperature of the filament material polymer and lower than the melting point; below the glass transition temperature, uniform stranding cannot be achieved, and above the melting point, the strands may be cut or This is not preferable because it causes non-uniformity of the wire diameter.

The false strands 5' are further twisted together under tension in the heating device 8, resulting in a substantially uniform strand and at the same time a sufficiently heat-set strand 5. The strands 5 are then subjected to rapid cooling, for example by spraying the strands 5 with cold water from a cold water shower 10 or by passing the strands 5 through a bath of cooling water. This quenching process is important for effectively preventing untwisting of the stranded wire 5 and fixing the degree of orientation uniformly, and when adopting air cooling or slow cooling instead of quenching, it is important to ensure that the strands are evenly twisted. Unable to get strands.

Thus, the synthetic resin strand of the present invention, which is finally wound onto the take-up roll 11, has a uniform twist and excellent strength and durability. It can be expected to be applied to various uses.

Next, the present invention will be further explained by examples.

Example 1 A wire with a diameter of 3 mm was placed on three bobbins of the apparatus shown in FIGS. 4 and 5, with a draw ratio of 4.0 and unfixed.
Attach the polyethylene terephthalate monofilament of 2 and rotate the bobbin mounting plate.
It was withdrawn at a speed of m/min. While maintaining this tension, the wire is twisted to a total length of 1m, and heated by a heater.
After passing through a heating device whose temperature is controlled at 200℃ to cause twisting and heat fixation, the stranded wire is sprayed with cooling water at 20 to 30℃ and rapidly cooled, resulting in a wire diameter of 6 mm.
Thus, a symmetrical twisted wire with a twist count of 40 times/m was obtained.

The tensile strength of this stranded wire was 500 kg, and it had much better flexibility than polyethylene terephthalate wire with a wire diameter of 6 mm.

Comparative Example 1 A stranded wire was produced in the same manner as in Example 1 except that in place of the stretched and unfixed polyethylene terephthalate monofilament of Example 1, unstretched and unfixed polyethylene terephthalate monofilament having a wire diameter of 3 mm was used.

The resulting stranded wire had a considerably uneven wire diameter, and its tensile strength was poor at 150 kg.

[Brief explanation of the drawing]

1 to 3 are perspective views of the stranded wire, FIG. 4 is a schematic diagram of the manufacturing process of the stranded wire of the present invention, and FIG. 5 is a plan view of the bobbin mounting plate. 1...Bobbin mounting plate, 3, 3', 3''...Bobbin, 4
...Striated material, 5'...Temporarily twisted wire, 5...Twisted wire, 8...
Heating device, 10... Cooling water shower, 11... Winding roll.

Claims (1)

[Claims] 1. When manufacturing a stranded wire by twisting together multiple filaments made of thermoplastic polyester and/or polyamide with a wire diameter of 1.0 to 4.0 mm, stretched and unfixed wires are drawn from multiple bobbins on a rotating bobbin mounting plate. The filament is pulled out under tension, passed through a heating device controlled at a temperature above the glass transition temperature and below the melting point of the filament material to cause substantial twisting and heat setting, and then rapidly cooled. A method for manufacturing stranded synthetic resin wire.