JPH04126218A - Production equipment of rodlike body - Google Patents

Abstract

PURPOSE:To make it possible to easily change the tension adjustment rate without giving damage to formed body by a method wherein a tension control, which produces air flows jetting downwards at all times from both sides of rodlike body extruded continuously from a mold, is equipped. CONSTITUTION:Foam 3, which is produced by melting and kneading foamable thermoplastic resin with an extruder 8 and continuously extruded from a mold 9, is continuously formed and taken off through an external dimension detector 2 and a tension control 1 with an take-off machine 10. During this time, by actuating a compressor in advance and setting a pressure regulating valve properly, in the tension control 1, the foam 3 shows a curved form convex downward by air flows 7 jetting obliquely downwards from the air jetting holes 6, 6... of pipes 4 and 4 through the compressor and the pressure regulating valve, even when the foam 3 sags, resulting in al-lowing to maintain the tension of the foam at the charging to the take-off machine 10 at constant.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention involves melting and kneading a thermoplastic resin using an extruder, extruding it continuously from a mold, and then using a take-off machine to collect the extruded rod-shaped body. The present invention relates to an apparatus for producing a rod-shaped body that can be withdrawn.

(Prior art) Conventionally, in this type of seed manufacturing apparatus, for example, as shown in FIG. Rod-shaped foam (hereinafter referred to as "foam") obtained by
B is generally taken off by a take-off machine C, and its cross-sectional area is determined by the amount of extrusion per unit time and the take-up speed.

By the way, since the extrusion mold A is suddenly extruded under atmospheric pressure and foams to form a molded product, the molding process is unstable and the external dimensions constantly change, so the external dimensions are constantly measured using the external dimension detector d. , it is necessary to adjust the take-up speed in conjunction with the take-up machine C to correspond to changes in the outside dimensions, and strive to make the outside dimensions uniform.

In addition, since the take-up speed often fluctuates in this way, if the take-off is carried out in this way, the tension will not be constant when it is charged into the take-off machine C, and there is a risk that it will meander just before being charged. Therefore,
After leaving the outer dimension detector d, it is charged into a take-up machine C via a tension adjustment device e.

By the way, this tension adjustment device e is usually used for dancers.
A roll or simply a roller placed left in the direction of travel of the foam is used, and in this way, a tension adjustment device e is interposed between the outer dimension detector d and the take-up machine C, and the foam is slightly is accumulated in the length direction, so that even if there are fluctuations in the take-off speed of the molded body fed into the take-off machine C, the molded body is charged under constant tension.

(Problems to be Solved by the Invention) However, in the above-mentioned tension adjustment device e, when the roller comes into contact with the molded product, the molded product tends to be deformed by the roller, the surface of the molded product is damaged, and the luster is lost. In addition, even if you want to change the degree of tension adjustment depending on the type of raw materials, molding conditions such as molding speed, and the shape of the molded product, it is necessary to stop the machine and replace the rolls. Yes, it wasn't easy.

In view of the drawbacks of the prior art such as ridges, the present invention provides a rod-shaped body manufacturing apparatus that does not cause any damage to the molded body and is equipped with a tension adjustment device that allows the degree of tension adjustment to be easily changed. It was made for the purpose of providing.

(Means for Solving the Problems) The present invention melts and kneads thermoplastic resin in an extruder, and continuously extrudes the rod-shaped body from a mold by passing it through an external dimension detector and a tension adjustment device. In the apparatus for producing a rod-shaped body which is taken up by a pulling machine, the tension adjustment device is configured to form an air flow that is constantly ejected substantially downward from both sides of the rod-shaped body. Its gist is body manufacturing equipment.

(Function) Since the present invention uses a tension adjustment device that forms an air flow that is constantly ejected downward from both sides of the rod-shaped body, rollers or the like are not directly pressed against the molded body to adjust the tension. There is no damage to the molded product. Furthermore, by incorporating a pressure regulating valve into the air flow, the tension adjustment range can be changed in various ways, and the operation is easy.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic explanatory diagram showing one embodiment of the device of the present invention, and FIG. 2 is an enlarged view of the main parts of the device of the present invention, in which 1 is a tension adjustment used in the device of the present invention. This device is the same as the prior art shown in FIG. 5, except for the tension adjustment device 1. In addition, 2 is an external dimension detector, and 3 is a rod-shaped foam body with a diameter of approximately 30 mm, which moves in the direction of the arrow.

As shown in Fig. 3, this tension adjustment device 1 consists of two pipes 4.4 each having an outer diameter of about 25 seconds and closed at the ends, which are erected in parallel in a tuning fork shape, with the lower part connected to an air introduction tube. 5, and the air introduction pipe 5 is also connected to a compressor via a pressure regulating valve (not shown).

As shown in Fig. 4, the pipe 4.4 has air ejection holes 6.6 with a diameter of about 111 mm perforated in a vertical line at almost equal intervals, and the air Spout hole 6.
The axial direction of 6... is approximately 35 symmetrical with respect to the vertical direction.
It is directed diagonally downward at an angle of inclination of °.

Next, the operation of the apparatus of the present invention will be explained for the case of the above embodiment. A foamable thermoplastic resin is melt-kneaded by an extruder 8 and continuously extruded from a mold 9 to form a continuously molded foam. 3
is taken up by the take-up machine 10 via the external dimension detector 2 and the tension adjustment device 1. During this time, the compressor is operated in advance and the pressure adjustment valve is set appropriately. Even if there is slack in the foam 3, the air blowout hole 6 of the pipe 4.4 passes through the compressor and pressure regulating valve.
．． 6. Due to the air flow 7 ejected diagonally downward, the foam 3 takes on a downwardly convex curved shape, making it possible to maintain a constant tension when it is charged into the take-up machine IO. done. Incidentally, the tension at this time is about 20 to 30 g, and it is difficult to obtain such a slight tension with a normal metal roll.

In the above-mentioned embodiment of the present invention, an example was shown in which two pipes erected in parallel in a tuning fork shape were used as a device for forming an air flow that always jets out almost downward, but this example is particularly In addition to this, for example, instead of a pipe, it may be made of two walls erected in parallel,
Alternatively, a plurality of the pipe-like pipes may be arranged in series at intervals, and furthermore, in the case of the two walls erected in parallel, a blind-like slit may be used. The air ejection hole 6 may also be an air ejection hole.
．． It is more effective to make the vertical interval of 6. as small as possible and make the inclination angle as steep as possible.

Furthermore, the adjustment range will naturally be wider if the depth of the wind pressure zone is made as deep as possible within the range corresponding to the size of the manufacturing equipment.

In the above embodiment of the device of the present invention, an example of a rod-shaped foam was shown, but the molded body is not necessarily limited to this, and the molded body is highly flexible and requires an external dimension detector and a tension adjustment device. It can also be employed in the production of hoses made of thermoplastic resin, for example.

(Effects) The rod-shaped body manufacturing apparatus of the present invention functions as a tension adjustment device.
Since we adopted a rod-shaped body that generates an air flow that is constantly ejected downward from both sides, the tension adjustment device can directly contact and press molded objects such as foam to adjust the tension. Therefore, in combination with the cooling effect of the air flow, there is no damage to the molded article or loss of gloss. Furthermore, by incorporating a pressure regulating valve into the air flow, the tension adjustment range can be changed in various ways, and the operation is easy.

[Brief explanation of the drawing]

1 is a schematic explanatory diagram showing one embodiment of the device of the present invention, FIG. 2 is a partially cutaway front view showing an enlarged main part of the device of the present invention, and FIG. 3 is a perspective view of the same; FIG. 4 is a partially cutaway enlarged sectional view of the same as above, and FIG. 5 is a schematic explanatory diagram showing an example of a conventional device. 1 and e...Tension adjustment device, 2 and d...External dimension detector, 3 and b...Foam, 4.4...Pipe, 5...Air introduction pipe, 6...Air jet hole, 7...・Air flow, 8 and f・
・Extruder, 9 and a...Mold, 10 and C...Take-off machine. Figure number? Figure diagram

Claims (1)

[Claims] 1. A rod-shaped body in which thermoplastic resin is melted and kneaded in an extruder, and the rod-shaped body is continuously extruded from a mold, and is taken up by a pulling machine via an external dimension detector and a tension adjustment device. 2. A manufacturing apparatus for a rod-shaped body, characterized in that the tension adjustment device is configured to form an air flow that is constantly ejected substantially downward from both sides of the rod-shaped body.