JPS5870728A - Production of polyolefin rope - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing polyolefin ropes.

Conventionally, polyolefin ropes have been produced by, for example, twisting 3-wood strands to form a rope, then winding the rope, adding water in a separate process, and subjecting the rope to heat treatment by applying a high-frequency electric field.

The purpose is to eliminate the repulsive force caused by heat treatment and twisting inside the rope, prevent it from losing its shape and kinging, increase flexibility, and suppress deterioration over time.The principle is as follows. By heating the rope to a temperature slightly below the softening point of the material, the direction of the molecular arrangement is corrected in the direction of twist, so that the twisted state becomes the natural state for the rope's molecular arrangement. After that, it is cooled and fixed in that state to eliminate the repulsive force. Note that "kink" refers to the eight strands that make up the rope being twisted by the repulsive force caused by twisting due to rapid expansion and contraction of the leap.

In addition, the reason why water was conventionally added to the rope during high-frequency heating is that polyolefin materials do not have polar groups like water, so there is no dielectric loss due to high frequencies, so even when a high-frequency electric field is applied, This is because there is almost no internal heat generation, so water is added to generate heat, and the generated water heats the rope.

However, in the conventional method, the pressure at the part where the high-frequency electric field is applied cannot be raised above atmospheric pressure, and the water temperature cannot be raised above 100°C, so that almost no effect of heat treatment can be expected. This is because 100°C is a temperature far below the softening point of polyolefin materials such as polypropylene.

In addition, with conventional methods, water adhesion is highly uneven, and therefore uniform heat treatment cannot be expected.

SUMMARY OF THE INVENTION The present invention has been made in view of these shortcomings of conventional methods and provides a method for producing polyolefin ropes that is characterized by rounding and effective heat treatment to produce flexible and long-lasting ropes. Expanding the invention, the polyolefin strand (2) was made into a rope (6), and the rope (6) was then kept under tension to the extent that it did not loosen.1
1. A method for producing a polyolefin rope (6), which is characterized by passing it through a steamed trout and heat-treating it.

The present invention will be described below with reference to the drawings.

As mentioned above, the feature of the present invention is that the rope (6) is heat treated with steam. Therefore, for example, after forming three ropes (2) into a rope (6), steam (
If the condition of heat treatment according to 2) is satisfied,
As shown in Figure 91 and Figure 2, the steam heating tube (9)
Even if the trout is heat treated with steam inside the
A container that utilizes the equilibrium between water pressure and vapor pressure as shown in the figure (
(a) Even if heat treatment is performed using a hydraulic vessel (hereinafter referred to as "me"), there is no essential difference in the effect.

The reason why the rope (6) is kept under tension during heat treatment is to heat treat the rope (6) in a straight state. Another method is to pull the rope (6) using the Freon F capstan roll (7) and the rear capstan roll (6).

First, the case where the rope (6) is heat treated using the steam heating tube (9) will be described. Figures 1 and 2 show a steam heating pipe (9) between the front capstan roll (7) and rear capstan roll (f) of the net making machine.
This shows the state in which it is installed.

The rope (6) is generally constructed by twisting eight strands e). Therefore, the strand coil (1) with the strand (2) wound around each of the eight strand bobbins (3) shown in the left part of the net making machine in FIG. Pull out the strands (2) from each of the strand bobbins (3), and thread the eight strands (2) through the outer periphery of the cylinder (4) as shown in Figure 8.
8 by rotating the cylinder (4).
Strand (2) of the book in the pitch voice (S) part,
The pitch boi 7 (6) is made into one rope ('@) as shown in Figure 6.
It has an internal shape that matches the shape of the rope, and functions to twist eight rotating striped lands (2) into one rope (6). Note that when the cylinder (4) is rotated, twisting occurs in the opposite direction, that is, to the left in Figure 1, but this can be done by twisting the striped land (2) in the opposite direction in advance. Yo>, it can be offset.

In this way, the rope is made from the three strands (2) and the front capstan roll (7) K
After wrapping it around 1km, it is guided into the steam heating tube (9) through the guide part (8).

In particular, the guide part (8) must be able to prevent leakage of the steam DI inside the steam heating tube (4) as much as possible, and must not damage the guided rope (6). No. Examples of devices that meet such conditions include a labyrinth (2) as shown in FIG. 6, a pitch voice (5) as shown in FIG. 6, and a cylinder as shown in FIG. Note that Figures 1 and 2 show the guide section (8
) is a case where a cylinder (e) is used.

As shown in Figure 5, the labyrinth (2) seals the steam with a large number of ridges provided inside the cylinder. In the case of Figure 6, 1.

Steam oO inside the steam heating tube (9) on the right side using eight labyrinths (b) connected by Kin-a-yu.
The leaked steam Q is exhausted from the left exhaust pipe (2). In addition, when sealing the steam QO using the labyrinth (2), the nozzle (1) is used as shown in Figure 6.
4 may be inserted in the middle of the labyrinth box, and the sealing effect of the steam (2) may be enhanced by injecting high-pressure air from its nozzle (b) toward the steam heating tube (9). The advantage of using a labyrinth (b) is that it has an excellent sealing effect, but the disadvantage is that it is expensive, so labyrinths of various sizes Ovk are available depending on the diameter of the rope (6) to be manufactured. This means that it requires a considerable financial burden.

Pitch voice (5) aAs mentioned above, it has an internal hidden shape that matches the shape of the rope (6), so the pitch voice (5)
When used in a timely manner, leakage of steam (2) can be almost completely prevented. However, when using the Pitch Voice QIh), the Pitch Voice QIh) must be rotated as the rope (6) advances, and when the Pitch Voice is installed as a guide part (8). Ia, j17
10 o, so it must be installed through a rotary diode (generally this installation expands)
The installation is more difficult than the installation of (The rotation of the retarded rotor is preferably done by a torque motor (2) as shown in Fig. 9.) As is clear from Fig. 8, the cylinder (E) has a simple structure69 and is easy to install. However, the gap between the rope (6) and the rope (6) is large, making it easy for steam to escape, so use a thick rope (6).
Not suitable for manufacturing. In addition, even when using a cylinder, the effect of sealing the steam aO can be enhanced by providing a nozzle a4 in the middle of the cylinder and pressurizing high-pressure air as in the case using a labyrinth@.

Which of the above should be used as the guide portion (8) must be determined by weighing the merits and demerits of each of the nine mentioned above.

Now, the rope (6) guided from the guide part (8) to the inside of the steam heating tube (9) in this way is subjected to heat treatment by steam chestnut while proceeding inside the steam heating tube (9). .

The time required for heat treatment is the time required for heat to be sufficiently transmitted to the center of the rope (6).
・) It is influenced by the diameter of the pipe and the temperature of the steam. For example, when a rope (6) having a diameter of about 1 gag is heat treated with saturated steam αQ of 1 to 100 g, a time of at least about 60 seconds is required.

Since heat treatment requires a relatively long time, the traveling speed of the rope (6) is slowed down and the rope (6) is moved 1k times inside the steam heating tube (9) using guide rolls (b). It is better to reciprocate and expose the rope (6) to the steam α for a longer time.

The steam (2) used in the heat treatment 11K may be saturated steam or heated steam.

Heating steam has the advantage that there is less steam leakage because a high temperature can be obtained at a relatively low pressure.

The rope (・
) The guide part shown in Figures 1 and 2 on the right side (the guide part is directed outward from the center, is wrapped around the rear capstan whirl <f> several times, and the attached moisture is removed from the rope (6) itself). After being evaporated by residual heat, it is led out of the net-making machine as a product.

In addition, here, the rear capstan roll ('/
It is preferable that the rotational speed of the roll (1) is somewhat slower than the rotational speed of the 70-nt capstan roll (7), taking into account the shrinkage of the rope (6) due to heat treatment.

- Next, the case where the rope is heat-treated using the hydraulic container (9) will be explained. FIG. 4 shows the principle of heat treatment of the rope (6) using the hydraulic container (95).

Hydraulic container (also in case of 95, 8 strips) land (2
) is twisted to form a single rope (6), which is the same as in the case of using the steam heating tube (9) described above.

As shown in Figure '4', the rope (6) that has been made into a rope is guided through the water (2) by the guide roll I inside the hydraulic tower (a) on the left side, and is then guided through the water (2) inside the hydraulic vessel (95). The guide roll (c) is guided into the inside of the hydraulic container (95,
It is exposed to the steam (2) inside the hydraulic container (95) and undergoes heat treatment.

In this case, as is clear from Fig. 94, leakage of steam αQO into the water inside the hydraulic tower (2) is completely prevented.

In addition, the water level (c) inside the hydraulic container (95) is
It is determined by the balance between the pressure of steam (2) and the pressure of water (4). Therefore, since the steam rises and falls as the pressure of the steam (10) fluctuates, for safety reasons, it is desirable to set the water level at a height of about 1 m from the bottom of the hydraulic container (9'). .

The rope (6) that has been heat-treated in this way is guided through the water inside the right-hand hydraulic tower, led to the outside, and then processed through the steam heating pipe (9) described above. It is similar to

1*. The time required for the heat treatment is also the same as in the case using the steam heating tube (9) described above.

In the manner described above, the polyolefin rope (6) is heat-treated to produce the rope (6).

The advantages of this manufacturing method are that because steam is used for heat treatment, it is possible to set any temperature in the same device by changing the steam pressure, that heat treatment can be performed at high temperatures, and that unlike high-frequency heating, there is no dielectric loss in the material. The pressure of the steam (2) is uniform within the container, the heat exchange efficiency is high, and heat treatment can be performed evenly and evenly.

[Brief explanation of drawings]

Figure 1 is a plan view of the net making machine, Figure 2 is a front view of the net making machine, Figure 8 is a side view showing how the strand set in the bobbin is guided from the outer part of the cylinder to the pitch voice, and Figure 4 The figure is a side view showing heat treatment using a hydraulic container.
Figure 6 is a sectional view of the labyrinth, Figure 6 is a sectional view of the pitch voice, Figure 7 is a sectional view of the pitch voice incorporated into the rotary cage, Figure 8 is a perspective view of the cylinder, and Figure 9 is the pitch voice. Explanation of symbols 1...Strand coil 2...Strand 8-
Strand bobbin 4...Cylinder 6--Pitch voice 6...Rope 7...Front capstan roll 7'...Rear e-capstan roll 8
- Guide part 8'... Guide part 9... Steam heating tube 10-, Steam 11... Guide roll 11', Guide roll 12- Labyrinth 18-, Curved part 14-
・Nos. k 15-$ Cylinder 16...Fel) Packing 17...Rotary cage attack 18-Gasket 19...Oil seal 20...Cylinder 21-
...Y Luk motor-9'...Hydraulic container 22--Hydraulic tower 22'...Hydraulic tower 28...Water 24...Water surface 26...Reducing valve Patent applicant Taiko Co., Ltd. Representative Director Kojima Seigen Figure 3 Figure 4 Figure 7 Figure 8 Figure 9

Claims (1)

[Scope of Claims] 1. Rope rope making of polyolefin F-land,
Next, I kept the p-de in a tense state without letting up.
1. A method for producing a polyolefin rope, characterized by passing it through steam and heat-treating it. 2. The tension can be established by wrapping the rope around the front capstan roll Klk several times, guiding it into the steam, passing it through the steam, and then wrapping it around the rear capstan roll several times and pulling it. 2. The method for producing a polyolefin rope according to claim 1, wherein the polyolefin rope is maintained.