JPH04185783A - Heat treatment of polyolefin rope - Google Patents

Abstract

PURPOSE:To obtain the title rope flexible even underwater, to be used for fixed shore nets, etc., through such processes that polyolefin strands are made into a rope, which is then passed through a vacuum under a marginally tensilized state and then passed through a high-pressure steam to make a continuous heat treatment. CONSTITUTION:Polyolefin strands 2 are guided through the inside of the outer periphery of a cylinder 4 of a rope making machine A into a pitch poise 5, and the three strands 2 are made into a single rope 6 by revolving the cylinder 4, and this rope is wrapped on a front capstan roll 7a and fed, via a guide 8a, into a vacuum pipe 9, and then, while maintaining under a marginally tensilized state, passed through a vacuum, fed into a steam pipe 10 and passed through a high-pressure steam to make a continuous heat treatment. The resulting rope is then guided externally through a guide 8c, wrapped on a rear capstan roll 7b followed by evaporating the water contained and drying, thus obtaining the objective rope 6.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for heat treating a rope made of polyolefin strands used for culturing nets for scallops, fixed nets, and the like.

BACKGROUND OF THE INVENTION Conventionally, a technique described in Japanese Patent Publication No. 47075/1983 is known as a technique for heat treating a rope made of polyolefin strands.

This technique is characterized by forming a polyolefin strand into a rope, and then heat-treating the rope by passing it through steam while keeping it under tension to the extent that it does not loosen. Furthermore, the tension is maintained by wrapping the rope several times around the front capstan roll, guiding it into the steam, passing through the steam, wrapping the rope several times around the rear capstan roll, and pulling it. It is characterized by the fact that

Problems to be Solved by the Invention In general, ropes used for aquaculture nets such as scallops and fixed nets are flexible even when immersed in water.

Moreover, it is required that it not expand or contract due to aging.

However, with this technology, polyolefin strands can be made into a rope and then heat treated by passing the rope through steam while keeping it under tension to the extent that it does not loosen. On the other hand, when these ropes become thicker than 10 mm or more, when they are passed through steam and heat treated, the ropes have the advantage of being efficient and continuous. The rope is heated by steam and shrinks, but since the steam does not penetrate into the inside of the rope, the outside is heat-treated and shrinks, while the inside is not sufficiently heat-treated and shrinks insufficiently. As a result, the rope is tightly tightened from the outside (outer circumference) and loses its flexibility. Moreover, since the inside has not been sufficiently heat treated, there is a risk of elongation due to aging.

The present invention was developed with the aim of solving the above-mentioned problems.

Means for Solving the Problems In the present invention, as shown in FIGS. 1 to 6, polyolefin strands are made into ropes.

Next, the rope is passed through a vacuum while being kept under tension to the extent that it does not loosen, and then passed through high pressure steam to undergo continuous heat treatment.

Example Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, an apparatus for carrying out the present invention includes a pressure reducing pipe 9 and a steam heating pipe 10 between a front capstan roll 7a and a rear capstan roll 7b of a net making machine A. A pressure reducing means B which is connected in series through the guide portion 8b to allow the rope to pass continuously and which reduces the pressure inside the pressure reducing tube to create a vacuum state is controlled from the outside of the pressure reducing tube 9 to the inside thereof. Furthermore, a high-pressure steam supply means C for supplying high-pressure steam into the steam heating tube 10 and discharging condensate is provided in the steam heating tube 10.
It is provided so that it can be controlled from the outside to the inside.

As shown in FIG. 1, the pressure reducing means B is connected to a vacuum pump 14 from a pressure reducing pipe 9 via an automatic valve 13, and is configured to create a vacuum inside the pressure reducing pipe 9 by the action of the sheep vacuum pump. It is.

As shown in FIG. 1, the high-pressure steam supply means C includes piping from a steam heating pipe 10 to a high-pressure steam source 15 via an automatic valve 16, and piping from the steam heating pipe 10 to an automatic valve 17 and a trap 18 in parallel. Steam heating tube 1
The rope 6 is heated by supplying high-pressure steam into the pipe 6, and drain generated inside the pipe is discharged.

Here, the rope 6 is generally constructed by twisting three strands 2, and therefore a strand is attached to each of the three strand bobbins 3 shown in the left part of the net making machine A in FIG. Strand coil 1 wrapped with 2
are set as shown in Fig. 1, the strands 2 are pulled out from each strand bobbin 3, and the three strands 2 are passed through the outer circumference of the cylinder 4 as shown in Fig. 3.
By guiding the rope to the pitch voice 5 and rotating the cylinder 4, the three strands 2 are made into one rope 6 at the pitch voice 5. Furthermore, the pitch voice 5 has an internal shape that matches the shape of the rope 6 as shown in FIG. 4, and serves to twist the three rotating strands 2 into one rope 6. . Note that by rotating the cylinder 4, twisting occurs in the opposite direction, that is, to the left in FIG. 1, but this can be offset by twisting the strand 2 in the opposite direction in advance. I can do it.

In this way, the rope 6 made from the three strands 2 can be wound several times around the front capstan roll 7a and then guided into the interior of the pressure reducing pipe 9 through the guide portion 8a.

Here, the guide portions 8a, 8b, and 8c are those that can prevent leakage of steam inside the steam heating tube 10 and vacuum inside the pressure reducing tube 9 as much as possible, and also prevent the guided rope 6 from leaking.
It must be something that does not damage. Pinch Voice 5 is one that meets such conditions.

As described above, the pitch voice 5 has an internal shape that matches the shape of the rope 6, so when it is used as a guide, leakage of steam and vacuum can be almost completely prevented. However, when using the pitch voice 5, it is necessary to rotate the pitch voice 5 as the rope 6 advances.
8c, it must be installed via a rotary joint 20 as shown in Figure 5.
Further, an oil seal 22 and a gasket 21 are provided to seal the engine so that internal steam and vacuum do not leak due to the rotation. The rotary joint 20 is rotated by a gear 24, which has two pitch voices 5 engaged, and a gear 25 which is pivoted at a universal joint 26, and the drive is as shown in FIG. According to the torque motor 23, the torque motor 23 can be rotated easily without applying more torque than necessary.

In addition, in order to shorten the pressure reducing pipe 9 and the steam heating pipe 10,
As shown in Fig. 2, the rope 6 may be extended several times using the guide roll 6 inside the pressure reducing pipe 9 or the steam heating pipe 10 to increase the time the rope 6 is exposed to vacuum or high pressure steam. good.

Next, its effect will be explained.

As shown in FIG. 1 and FIG.
The rope 6 passes through a vacuum due to the reduced pressure inside the pressure reducing tube to exhaust the air inside the rope, and is then guided to the next steam heating tube 9 via the guide section 8b. , and is heat-treated by high-pressure steam as it progresses inside. The time required for this heat treatment is sufficient time for the heat to reach the center of the rope, but since it is passed through a vacuum first, it has a better insulation effect than when high-pressure steam is applied directly from the atmosphere. Since some air is removed, heat treatment can be performed in a relatively short time.

After passing through the vacuum in this manner, the rope 6 heat-treated with steam is guided to the outside from the right guide portion 8c shown in FIGS. 1 and 2, and wound several times around the rear capstan roll 7b. After the attached moisture is evaporated by the residual heat of the rope itself, the product is made into a net making machine A and heat treatment equipment! Guided to the outside of D.

Note that the rotational speed of the rear capstan roll 7b may be set slightly slower than the rotational speed of the front capstan roll 7a in consideration of shrinkage of the rope 6 due to heat treatment.
Alternatively, the rear capstan roll 7b may be moved by the torque motor 23 to match the rotational speed of the front capstan roll 7a.

Effect of the invention As described above, according to the present invention, the following effects are achieved.

Polyolefin strands are made into ropes, and then the ropes are passed through a vacuum while being kept under tension to the extent that they do not loosen, and then passed through high-pressure steam for continuous heat treatment. .

The air inside the rope can be removed by vacuum,
High-pressure steam can penetrate into the inside of the rope and heat it, so the rope shrinks uniformly inside and outside due to heat treatment. As a result, the rope is no longer tightly tightened due to contraction only on the outside, making the rope more flexible.Furthermore, vacuum and high-pressure steam are applied uniformly not only inside and outside the rope, but also along its length. The molding is performed uniformly and at a high temperature of 100° C. or higher, and a high-quality rope can be provided without any change in expansion or contraction over time.

[Brief explanation of the drawing]

Fig. 1 is a schematic top view including a net making machine showing an embodiment of the device according to the present invention, Fig. 2 is a schematic front view of Fig. 1, and Fig. 3 shows a strand set in a bobbin being moved around the outer periphery of a cylinder. Simplified side view showing the state leading from the part to the pitch voice, 4th
The figure is a schematic sectional view of the pitch voice, Figure 5 is a schematic sectional view of the pitch voice incorporated into the rotary joint, and Figure 6 is a schematic sectional view of the pitch voice incorporated in the rotary joint.
The figure is a schematic front view of a rotary joint with a pitch voice installed in a pressure reducing pipe and a steam heating pipe connected in series. A: @ net machine, B: pressure reduction means, C: high pressure steam supply means, D
: Heat treatment equipment, 1st strand coil, 2: Strand, 3rd strand pobin, 4th cylinder - 15: Pitch voice, 6: Rope, 7a: Front capstan roll, 7b: Rear capstan roll, 8a, 8b,
8c: Information department. 9: Pressure reducing pipe, 10 Ni steam heating tube, lla, 11b Ni guide roll, 13: Automatic valve, 14: Vacuum pump, 15
: High pressure steam source, 16: Automatic valve, 17: Automatic valve/18 Nidrap, 2o: Rotor no joint, 21: Gasket, 22 Oil seal, 23: Torque motor,
24: Gear, 25: Gear Figure 3 Figure 4 Figure 6

Claims (1)

[Claims] It is characterized by forming a polyolefin strand into a rope, then passing the rope through a vacuum and then through high-pressure steam while keeping the rope under tension to the extent that it does not loosen, and then heat-treating it continuously. Heat treatment method for polyolefin rope.