JPH0524098A - Apparatus for producing synthetic resin screw body - Google Patents

Abstract

PURPOSE:To enable accurate correction in consideration of delicate factors including molding conditions and external temperature affecting the form, etc., of a screw body, by eliminating waves on a water surface of the first water vessel by establishing the water vessel of a small water surface area and of a small volume and overflowing supply water. CONSTITUTION:Multistage cooling water vessels 18, 20 are installed. The first water vessel 18, through which the resin extruded from a die 14 passes initially, is established. The surface area is small and the water level is kept constant by overflow of supply water which is supplied in the direction rectangular to the running direction of a screw body 34 so that waves is suppressed during the passage of the screw body 34. Moreover, a baffle plate 28 which decrease the flow strength of supply water in the direction perpendicular to the running direction of the screw body 34 is installed between a supply port 27 for supply water and the screw body 34. An elevator which raises and lowers the first water vessel 18 is installed to adjust the space between the water surface of the first water vessel 18 and the die 14.

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for producing a synthetic resin spiral body, and more specifically, to produce a resin from an extruder die,
The present invention relates to an apparatus for manufacturing a synthetic resin spiral body which pushes resin into a cooling water tank arranged below while rotating the die and mainly twists and solidifies the resin by cooling between the die and the water surface of the cooling water tank.

[0002]

2. Description of the Related Art A spiral made of a synthetic resin is inserted into a fluid passage of a heat exchanger, for example, as a so-called turbulent element that stirs the fluid to enhance the heat radiation effect, or an optical fiber plug is provided in a spiral groove on the peripheral wall of the spiral. It is generally used as a fiber optic cable carrier for storage. Such a synthetic resin spiral body is manufactured by a method in which a molten resin is extruded into a narrow strip while rotating a die of an extruder, passed through a water tank arranged below to be cooled, and wound by a winding device. There is. That is, the extruded resin receives the resistance of the water in the cooling water tank, is mainly twisted in a spiral between the die and the water surface, is cooled as it is, and is wound up.
Therefore, the pitch of the obtained spiral body can be changed to that of various dies by changing the rotation speed of the die and by changing the distance between the die and the water surface. However, the shape and pitch of the obtained spiral body vary in the viscosity of the molten resin to be extruded due to, for example, subtle variations in material between lots of raw material pellets used, resin extrusion conditions (temperature, time, etc.), and outside temperature. As a result, the desired shape and pitch may not be obtained. Therefore, in addition to the purpose of changing the pitch of the spiral described above, variations in the various molding conditions described above are absorbed by adjusting the distance between the die and the water surface. In this way, the distance between the die and the water surface is adjusted by directly changing the water level in the cooling water tank or by moving the cooling water tank itself up and down (JP-A-57-123034).

[0003]

The method of adjusting the distance between the die and the water surface by vertically moving the cooling water tank itself has shorter response time and shorter distance adjustment than the method of directly changing the water level of the cooling water tank. Can be done in time. However, since it is necessary to continuously and completely cool the molten resin, the cooling water tank needs to have a large heat capacity, that is, a considerably large one. Moreover, in this case, if a vertically long cooling water tank is used, the overall height of the entire apparatus becomes extremely large. Therefore, a horizontally long cooling water tank is usually used.
However, when this vertically long cooling water tank is used, the surface area of the cooling water tank naturally becomes large, which causes a waviness phenomenon in the cooling water, causing a problem that the water level constantly fluctuates. Therefore, even if the height of the cooling water tank is adjusted, it is difficult to obtain a spiral body having a desired shape. In particular, in the case of an optical fiber cable carrier that accommodates the above-mentioned optical fiber line as a spiral body, high precision is required in the shape and dimension, and therefore, the conventional device cannot supply a satisfactory optical fiber cable carrier.

Therefore, an object of the present invention is to prevent the undulation phenomenon of the cooling water and stabilize the water level, and to manufacture a spiral resin which can be supplied to the use where the shape and dimension are required to have high precision. It is to provide a manufacturing apparatus for a spiral body.

[0005]

Means for Solving the Problems The present inventor has studied to achieve the above-mentioned object. As a result, in order to stabilize the water surface of the cooling water tank, the first water tank through which the spiral passes first is downsized. It has been found that it is effective to make the surface area of the water surface as small as possible and to make the cooling water overflow. Further, in the downsized first water tank, when the cooling water is supplied from the direction orthogonal to the traveling direction of the spiral body, the spiral body sways due to the flow force of the cooling water, so that the shape and size of the obtained spiral body are reduced. It was also found that it is easy to change. As a result of repeated studies based on these findings, the present inventor miniaturized the first water tank to minimize the surface area of the water surface and overflow the cooling water, and to the traveling direction of the spiral body. It was found that by providing a backing plate between the cooling water supply port and the traveling spiral to weaken the flow of the cooling water from a direction orthogonal to each other, the shape and size of the obtained spiral can be stabilized with extremely high accuracy. The present invention has been reached.

That is, according to the present invention, resin is extruded from a die of an extruder into a cooling water tank arranged below while rotating the die, and the resin is cooled mainly by twisting between the die and the water surface of the cooling water tank. In the apparatus for manufacturing a synthetic resin spiral body that solidifies, the cooling water tank is provided in a plurality of stages, and the first water tank through which the resin extruded from the die first passes is corrugated on the water surface when the spiral body passes through. In order to prevent the phenomenon from occurring, the supply water supplied from a direction orthogonal to the traveling direction of the spiral in the first water tank overflows and the water level is kept small by keeping the water level constant. And a pad plate that weakens the flow force in a direction orthogonal to the traveling direction of the spiral of the supply water is provided between the supply port of the supply water and the spiral, and To adjust the distance between the water surface and the die of the bath, there the first water tank to the apparatus for producing a lifting movement to move up and down mechanism comprising is provided a synthetic resin helices.

[0007]

According to the present invention, since the first water tank is set to have a small surface area of the water surface and the supply water overflows so that the water level is kept constant, the waviness phenomenon of the water surface may occur. Absent. Therefore, the distance between the water surface and the die can be adjusted accurately. In particular, in the production of this kind of spiral body in which delicate factors such as molding conditions and outside temperature are involved in the pitch and shape of the spiral, the distance between the water surface and the die, which is one factor that affects the pitch and shape, is accurately measured. Being able to make adjustments makes it easier to set conditions. Further, since a pad plate that weakens the flow force in the direction orthogonal to the traveling direction of the spiral of the supply water is provided between the supply port of the supply water and the spiral, the size of the first water tank is reduced. It is possible to prevent swaying of the spiral body traveling in the first water tank due to the flow force of the supply water, and it is possible to obtain a spiral body having a uniform shape and size together with the effect of stabilizing the water surface.

[0008]

The present invention will be described in more detail with reference to the drawings.
FIG. 1 is a schematic view showing the entire apparatus of the present invention, in which 10 is an extruder and 12 is its extrusion head. A die 14 is rotatably provided on the extrusion head 12. 16 is a motor for rotating the die. Since the rotating mechanism of the die 14 and the resin pushing mechanism therefor are known, the details thereof will be omitted. 18 is a first provided below the head 12
2 is a second water tank arranged below the first water tank 18, 22 is a third water tank provided on the side of the second water tank 20, and 24 is a feeding device. The first water tank 18 is shown in more detail in FIG. The first water tank 18 is provided with a small capacity so that the surface area of the water surface is as small as possible in order to prevent the waving phenomenon of the water surface. Reference numeral 26 is a cooling water inlet pipe, and a cooling water supply port 27 is provided at a lower portion of a side wall of the first water tank 18.
Is opened. The introduction pipe 26 is the first at the supply port 27.
Is connected to the side wall of the water tank 18 at a right angle. 28
Is a backing plate, the cooling water supply port 27 and the first water tank 1
8 is provided between the spiral body 34 and the spiral body 34 that runs near the center. The flow force of the cooling water supplied from the supply port 27 in the direction orthogonal to the spiral 34 is weakened by the pad plate 28. 30 is an overflow pipe, which is the first water tank 1
The water level in 8 is kept constant. The water overflowing from the overflow pipe 30 falls into the second water tank 20. 32
Is a guide pipe for the spiral body 34, and extends from the bottom surface of the first water tank 18 to the second water tank 20 to extend from the first water tank 18 to the second water tank 18.
It is connected to the aquarium. The first water tank 18 is an elevator 36
It is fixed above and is moved up and down together with the elevating table 36, which is appropriately moved up and down by a mechanism (not shown), and the distance between the water surface position and the die 14 is adjusted. In addition, 38 is a lifting / lowering guide ball. The cooling water supplied from the supply port 27 hits the contact plate 28 and the spiral 34
The flow force in the direction orthogonal to the traveling direction of is weakened, and it flows down from the overflow pipe 30 and the guide pipe 32 into the second water tank 20 below. Guide pipe 3
As long as the diameter of 2 is large enough to allow the spiral 34 to pass through, it is preferable that the diameter of 2 is small as far as it is. That is, the smaller the diameter of the guide pipe 32, the smaller the amount of water flowing down, and
The cooling water supply amount from 6 can be small. The supply amount of the cooling water from the introduction pipe 26 is larger than the amount of water flowing down from the guide pipe 32 because the temperature rise due to the temporary cooling of the spiral body 34 can be prevented, and the amount of cooling water is appropriately flown down from the overflow pipe 30, The water level in the water tank 18 should be kept constant. A guide drum 40 having a circumferential groove formed on the peripheral surface is provided in the second water tank 20, and the guide pipe 3 of the first water tank 18 is provided.
The spiral body 34 passing through the inside 2 is cooled while being guided in the circumferential groove. Reference numeral 42 denotes a guide roller provided outside the second water tank 20. The spiral 34 is horizontally guided in the water tank 22 and completely cooled. The spiral 34 passes through a small hole provided in the side wall 44 of the third water tank 22. The cooling water flowing out from the small holes is collected by the water intake pipe 46 leading to the inside of the water tank. The feeding device 24 includes three pairs of rollers, and pushes the spiral body 34 from above and below and feeds it to a winding device (not shown).

Due to the above structure, the dice 14
Rotate the resin from the die 14 into a strip, for example.
When extruded into the water tank 18, the strip-shaped resin receives the resistance of the cooling water, and is mainly twisted and solidified between the die 14 and the cooling water in a spiral shape. Then, it enters the second water tank 20 through the guide pipe 32 of the first water tank 18 and is further cooled. In the second water tank 20, it is fitted into the circumferential groove of the guide drum 40 and guided upward, and is guided horizontally by the guide roller 42 and enters the third water tank 22. The spiral 34 is almost completely solidified in the second water tank 20. Therefore, when the spiral body is fitted into the circumferential groove of the guide drum 40 and its rotation is restricted, the twisting of the spiral body between the die 14 and the guide drum 40 is stabilized. That is, the band-shaped resin is twisted mainly between the die 14 and the water surface of the first water tank 18 as described above, but a little twist occurs in the portion below the water surface of the first water tank 18 in a soft range of the resin. In any case, when the twist of the resin becomes steady, the pitch, shape, etc. of the spiral body 34 are specified. Therefore, if the pitch, shape, etc. of the spiral body 34 deviates from the desired pitch, shape, etc., the lift 36 can be moved up and down by a small amount to correct the deviation. Further, in order to eliminate variations in the pitch, shape, etc. of the spiral body 34 and obtain a uniform spiral body 34,
It is important that the water level of the water tank 18 is always constant and that the sway of the spiral 34 traveling in the first water tank 18 is eliminated as much as possible.

In this respect, in the present embodiment, the first water tank 18 is set to have a small surface area of the water surface and a small capacity, and the supplied water overflows. In addition, it is possible to perform accurate correction in consideration of delicate factors that influence the shape of the spiral body such as the molding conditions and the outside temperature, and the water level in the first water tank 18 can be always kept constant. Also, the first aquarium 1
As the volume of 8 is reduced, the spiral body 34 is likely to sway due to the flow force of the supply water supplied from the supply port 27. However, in the present embodiment, the supply port 27 and the spiral body are provided in the first water tank 18. The abutment plate 28 provided between the spiral member 34 and 34 prevents the spiral member 34 from swaying due to the flow force of the supply water. This is because the flow force of the supply water in the direction orthogonal to the traveling direction of the spiral 34 can be weakened by the contact plate 28. Further, in this embodiment, the first water tank 18 and the second water tank 20 are connected by the guide pipe 32, and the spiral body 34
Is the first water tank 18 together with the water flowing down in the guide pipe 32.
To the second water tank 20. Therefore, when the guide pipe 32 does not exist, that is, the spiral body 34 led out from the first water tank 18 has the first water tank 18 and the second water tank 20.
In comparison with the case of traveling in the space between the first water tank 18 and the second water tank 20, the spiral body 34 traveling in the first water tank 18
In combination with the installation of the contact plate 28, the occurrence of the sway can be more effectively prevented. By the way, the cooling of the resin in the first water tank 18 is the primary cooling, and the complete cooling is carried out in the second and third water tanks 20 and 22. But as mentioned above,
The twist of the resin is completely determined by the stage of the first water tank 18. Therefore, in the second water tank 20, even when the water surface undulates, the shape of the spiral body is not affected. Therefore, the second water tank 20 can be set to have a large capacity and complete cooling can be achieved. The third water tank 22 may be air-cooled instead of water-cooled.

[0011]

With the manufacturing apparatus of the present invention, a spiral body having a desired pitch and shape can be efficiently obtained.
Further, the obtained spiral body is a uniform one with very little variation in pitch, shape, etc., so that it can be supplied also for an optical fiber carrier which requires high accuracy in shape dimensions such as pitch.

[Brief description of drawings]

FIG. 1 is a schematic view showing the entire spiral body manufacturing apparatus.

FIG. 2 is a cross-sectional view showing a specific example of the first water tank 18 shown in FIG.

[Explanation of symbols]

 10 Extruder 14 Die 18 First Water Tank 20 Second Water Tank 27 Supply Water Supply Port 28 Abutting Plate 30 Overflow Pipe 32 Guide Pipe 34 Spiral 36 36 Lifting Table

Claims (1)

Claims: 1. A resin is extruded from a die of an extruder into a cooling water tank disposed below while rotating the die,
In a manufacturing apparatus of a synthetic resin spiral body in which a resin is mainly twisted between a die and a water surface of a cooling water tank to be cooled and solidified, the cooling water tank is provided in a plurality of stages, and the resin extruded from the die passes first. The first water tank has a small surface area of the water surface and a direction orthogonal to the traveling direction of the spiral body in the first water tank so that the water surface does not undulate when the spiral body passes. The supplied water is set so that the supplied water overflows and the water level is kept constant, and a pad plate that weakens the flow force in a direction orthogonal to the traveling direction of the spiral of the supplied water supplies the supplied water. Manufacture of a synthetic resin spiral body provided between the mouth and the spiral body, and provided with an elevating mechanism for moving up and down the first water tank in order to adjust the distance between the water surface of the first water tank and the die. Dress . [0001]