JPH05138717A - Method and device for manufacturing extruded foamy body - Google Patents

Abstract

PURPOSE:To provide a method and device for manufacturing an extruded foamy body where elimination or reduction of a space in a cooling process can be performed and the same possess a high cooling effect. CONSTITUTION:A foamy body 1 extruded from an extruding machine is wound round an external surface of a cylindrical body 7 to be turned by corresponding to a transfer speed of the foamy body 1 and the foamy body 1 is cooled while transferring spirally the foamy body 1 on the external surface of the cylindrical body 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for producing an extruded foam used in extrusion foam molding of a foam.

[0002]

2. Description of the Related Art Extruded foams are deformed even with a slight transfer resistance in an uncooled state immediately after extrusion foaming.
As shown in FIG. 3, the foam 1 extruded from the extruder 5 is
While being transferred on the plurality of rolls 18, it is cooled by air cooling, is taken up by the take-up machine 3, and is then taken up by the take-up machine 4.

[0003]

By the way, if the extruded foam is wound up on a winder without being completely cooled, the wound extruded foam contracts and the extruded foam deforms after winding. Therefore, it is necessary to completely cool the foam in the cooling step.

However, in the above cooling method, the cooling effect is small, and in particular, since the extruded foam is a heat insulator, it takes time to completely cool it, so that the length of the cooling device must be increased.
Alternatively, it was necessary to reduce or reduce the extrusion rate of the extruded foam.

However, when the length of the cooling device is increased, a space problem occurs, and when the extrusion speed is decreased, there is a problem that productivity is decreased. Therefore, the extruded foam that has not been completely cooled is once made into a long product, and then completely cooled by natural cooling to obtain a small rolled product.

However, the method of completely cooling by natural cooling requires a large space for natural cooling. In view of the above points, an object of the present invention is to provide a method and an apparatus for manufacturing an extruded foam which has a large cooling effect and can save space in the step of cooling the extruded foam.

[0007]

According to the method for producing an extruded foam of the present invention, a foam extruded from an extruder is wound around an outer surface of a cylindrical body which is rotated in accordance with the transfer speed of the foam. It is characterized in that the foam is cooled while being spirally transferred on the outer surface of the tubular body.

Further, the apparatus for producing an extruded foam of the present invention has a cooling water circulation path inside, and is provided with a rotatable cylindrical body and a feed guide which is rotated in conjunction with the cylindrical body. It is characterized by having a cooling device.

The shape of the tubular body is such that the shrinkage of the foamed body during cooling can be absorbed (for example, diameter 1 m, width 2 m).
It is desirable to form a tubular body having a size such that the diameter of the tubular body at the end of winding is about 3% smaller than the diameter of the tubular body at the beginning of winding the foam.

Further, it is desirable that the tubular body is made of metal and that its surface is plated with chrome or coated with Teflon to reduce resistance. Further, in order to wind the foam around the tubular body without difficulty, it is desirable that the tubular body has a diameter of 1 m or more. Furthermore, it is desirable that the tubular body be sufficiently heat-treated so that it is not distorted.

[0011]

Since the foam is spirally moved on the outer surface of the tubular body, the contact time with the tubular body is extended and the cooling effect is increased.

Further, since the tubular body is rotated in accordance with the transfer speed of the foam, the foam is cooled without being deformed by applying an unreasonable external force to the foam. Further, the feed guide allows the foam to be spirally transferred on the outer surface of the tubular body without being displaced.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to the following embodiments of the drawings. FIG. 1 is a schematic process drawing of one embodiment of the method and apparatus for manufacturing extruded foam of the present invention, and FIG. 2 is a schematic plan view of one embodiment of a cooling device used in the present invention.

1 is a foam extruded from the extruder 5, and 2 is a cooling device. 6 is a detector, 3 is a take-up machine, and 4 is a take-up machine. The cooling device 2 includes a tubular body 7 and a feed guide 8.

The cylindrical body 7 is a metal roll having a diameter of 1.2 m on one side, a diameter of 1.16 m on the other side, and a lateral width of 2 m. The cylindrical body 7 has a circulation path for the cooling water 11 inside and has a surface for reducing resistance. It is chrome plated. Further, it is rotatable by a motor 12, and rotary pipe joints 14 and 15 are attached to a rotary shaft 13.

The feed guide 8 comprises a chain conveyor 9 and a blade 10. The blade 10 is attached to the chain conveyor 9, and the chain conveyor 9 is driven by a motor (not shown). The chain conveyor 9 is attached parallel to the outer surface of the tubular body 7.

The interval between the blades 10 is the product diameter (20 to 50 m).
Adjusted to m), the tip contacting part is Teflon coated to reduce resistance. The feed guide 8 is driven in conjunction with the rotation of the tubular body 7 so that the blade plate 10 is fed by one pitch each time the tubular body 7 makes one revolution.

The cooling water 11 flows from the rotary pipe joint 14 to the cooling body 7.
It enters inside and is discharged from the rotary pipe joint 15. If necessary, the cold air tank 16 may be provided as shown by the imaginary line in FIG. 2 so that the cold air 17 is sent into the cold air tank 16. By doing so, the cooling effect can be further improved.

Cooling of the foam 1 is performed as follows. The foam 1 extruded from the extruder 5, the outer diameter of which is detected by the detector 6, and taken by the take-up machine 3 is wound around the tubular body 7 of the cooling device 2 in the direction of the arrow X in FIG. The wound foam body 1 is cooled while being spirally transferred on the tubular body 7 by the rotation of the tubular body 7 and the lateral displacement prevention of the blade plate 10 of the feed guide 8. Foam 1 cooled to a predetermined temperature
Is sent out in the Y-arrow direction and wound up by the winder 4.

[0020]

Since the foam is spirally transferred on the outer surface of the tubular body, the contact time with the tubular body is extended and the cooling effect is increased.

Further, since the tubular body is rotated in accordance with the transfer speed of the foamed body, an unreasonable external force is not applied to the foamed body, and further the foamed body is displaced on the outer surface of the tubular body by the feed guide. Since it is transferred in a spiral shape without being deformed, the foam can be cooled without being deformed.

Therefore, it is possible to save space in the cooling process of the extruded foam.

[Brief description of drawings]

FIG. 1 is a schematic process drawing of an example of a method and an apparatus for producing an extruded foam of the present invention.

FIG. 2 is a schematic plan view of an embodiment of a cooling device used in the present invention.

FIG. 3 is a schematic process diagram of a conventional extruded foam manufacturing apparatus.

[Explanation of symbols]

 1 Foam 2 Cooling Device 3 Take-up Machine 4 Winding Machine 5 Extruder 6 Detector 7 Cylindrical 8 Feed Guide 9 Chain Conveyor 10 Vane Plate 11 Cooling Water 12 Motor 14, 15 Rotating Pipe Joint 16 Cold Air Tank 17 Cold Air

Claims (2)

[Claims] 1. A foam extruded from an extruder is wound around an outer surface of a cylindrical body that is rotated in accordance with a transfer speed of the foam, and the foam is spirally formed on the outer surface of the cylindrical body. A method for producing an extruded foam, which comprises cooling the foam while transporting the foam. 2. A cooling device having a cooling water circulation path inside and comprising a rotatable cylindrical body and a feed guide rotated in conjunction with the cylindrical body. Extruded foam manufacturing equipment.