JPS5841735B2 - Manufacturing method of insulation material for pipes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a heat insulating material for pipes, and more specifically, a method for manufacturing a heat insulating material for pipes, and more specifically, a pipe made of a tubular thermoplastic resin foam having a locking device from a plate-shaped thermoplastic resin foam. The present invention relates to a method of manufacturing a heat insulating material for use in a vehicle.

BACKGROUND ART Heat insulators made of thermoplastic resin foams have been widely used for reasons such as their light weight and excellent heat insulating effect, and various methods for producing them are also known.

For example, a film having an adhesive layer all over the outer periphery of a tubular thermoplastic resin foam has one end that is linear in the longitudinal direction of the tubular foam and the other end that has a free end so that it can be locked. There is a known manufacturing method in which the foam is laminated as shown in FIG. There is.

However, the method described above requires a step of forming the foam into a pipe shape, cutting it to a regular length, and then covering and adhering it with a film, and a step of cutting the foam formed into a single pipe shape in its longitudinal direction. In the case of thermal insulation materials, the lengths of the foam and the covering film do not match, requiring edge treatment, which complicates the manufacturing process, ultimately leading to the occurrence of defective products and increased manufacturing costs. .

The present invention has been made with the object of providing a method of manufacturing a pipe insulation material with a locking tool from a plate-shaped thermoplastic resin foam using a more simplified process, particularly a continuous manufacturing method. The gist of this is that the two sides of a plate-shaped thermoplastic resin foam are brought together to form a cylindrical shape, and two pieces are attached to each of the outer surfaces near both sides of the abutting part. The plate-shaped thermoplastic resin foam deformed into a cylindrical shape is formed into a plate-like shape by fixing the locking tools piece by piece with the locking parts locked together. A method for manufacturing a heat insulating material for pipes, characterized in that internal stress to be restored is removed by heating.

The plate-shaped thermoplastic resin foam used in the present invention is a plate-shaped foam made of a thermoplastic resin, and examples of the thermoplastic resin include polyethylene, polypropylene, polyvinyl chloride, polystyrene, etc. Polyethylene/especially crosslinked polyethylene is preferably used.

Further, any known manufacturing method may be employed as the method for manufacturing the plate-shaped foam.

It is preferable for the foam to have closed cells because the insulation effect S is excellent, and the expansion ratio is preferably 10 to 40 times.

In addition, in the present invention, one locking tool is provided on each of the outer surfaces near both sides of the abutting portion of the cylindrical foam, which is made of two pieces and each piece has a locking portion that can be locked to each other. Since the pieces are fixed one by one, it is preferable that the outer surface of the foam has a certain level of strength, such as a foam laminated with a thermoplastic resin film such as polyethylene, or an integral skin as described in Japanese Patent Application No. 53-42137. Structured foams are preferred.

The locking device used in the present invention is composed of two pieces, and any known locking device can be used, each piece having a locking portion that can be locked to each other. Therefore, those made of thermoplastic resin such as polyethylene, polypropylene, nylon, etc. are preferable.

Next, the manufacturing method of the present invention will be explained with reference to the drawings.

FIG. 1 is a process diagram showing an example of the manufacturing method of the present invention.

In FIG. 1, 1 is a plate-shaped thermoplastic resin foam wound around a winding roll 12. In FIG.

The plate-shaped thermoplastic resin foam 1 is sent to the die 2 by the feed roll 14, and is deformed into a cylindrical shape by abutting both sides, and then pressed by the feed rolls 17 and 17', and the cylindrical abutting part is formed into a mating tool. 3, the abutting portions are aligned and sent to the pressure bonding roll 6.

The die 2 has a substantially flat entrance, but gradually becomes cylindrical, and a plate-shaped object inserted through the entrance is deformed into a substantially cylindrical shape when exiting from the exit.

In addition, hot air supplied from the hot air supply device 16 before the plate-shaped thermoplastic resin foam 1 is inserted into the die 2 so that the plate-shaped thermoplastic resin foam 1 is easily transformed into a cylindrical shape by the die 2. Preferably, the temperature is heated by .

The temperature of the hot air at this time is not particularly limited, but it should be set so that the plate-shaped thermoplastic resin foam 1 can be easily deformed.
It is preferable that it is 00-40 ooc.

5 is a locking tool wound around the winding roll 13.

It is easier to attach the obtained pipe heat insulating material to the pipe and lock it with the locking tool if the locking tool is fixed to the thermoplastic resin foam with the locking parts locked together. It is also preferable because it can be reliably locked.

The locking tool 5 is sent by a feed roll 15, heated by hot air supplied from the hot air supply device 4, and supplied to the pressure roll 6, where the thermoplastic resin foam 1' which has been deformed into a substantially cylindrical shape is brought into abutment. are heat-sealed to each of the outer surfaces near both sides of the section.

The temperature of the hot air at this time may be a temperature at which the locking tool 5 is melted and fixed to the thermoplastic resin foam, but it is preferably 300 to 400°C so that the fastening tool 5 is fixed in a short time.

The distance between the pressure rolls 6 and 6' is 9', which is slightly smaller than the outer diameter of the cylindrical thermoplastic resin foam 1', so that the locking tool 5 can be evenly and reliably fused to the foam. preferable.

The cylindrical thermoplastic resin foam 1' to which the locking device 5 is heat-sealed is press-molded into a substantially cylindrical shape by press-molding rolls 18 and 18', heated by hot air supplied from the hot air supply device 7, and fed. Sent to Roll 19, 19'.

The cylindrical thermoplastic resin foam 1' is moved by the feed roll 19.
is maintained in a cylindrical shape, cooled by cold air supplied from a cold air supply device 8, and cut into arbitrary lengths by a cutter 9 to form a heat insulating material 10 for pipes.

At the stage when the locking tool 5 is heat-sealed, the cylindrical thermoplastic resin foam 1' has internal stress that tries to restore it to a plate shape, but after that, it is heated by hot air supplied from the hot air supply device 7. The internal stress is removed, and the cylindrical thermoplastic resin foam is then cooled as it is to obtain a cylindrical thermoplastic resin foam that does not have the internal stress that would cause it to return to its plate shape.

Therefore, the heating by the hot air supply device 7 need only be sufficient to substantially remove the internal stress that causes the thermoplastic resin foam to restore its shape to a plate. That's fine.

In addition to heating using the hot air supply device described above, any known heating method such as an infrared heater or a panel heater may be used for heating.

In the above embodiment, the locking tool 5 is heat-sealed to the cylindrical thermoplastic resin foam 1', but any known fixing method may be used, such as solution adhesive, hot melt adhesive, etc. It may be fixed with an adhesive such as a mold adhesive.

Further, in the above embodiment, the cylindrical thermoplastic resin foam to which the locking member is heat-sealed is heated while being molded into a substantially cylindrical shape with press molding rolls 18° and 18'. Any known method may be used, and for example, a molding apparatus as described in Japanese Patent Application No. 12089/1989 may be used.

Further, in the above embodiments, cooling is performed using cold air, but any known cooling method may be used.
For example, methods such as allowing the material to cool or immersing it in water may be employed.

Although FIG. 1 shows only horizontal rolls such as feed rolls and press-forming rolls, vertical rolls may be used if necessary.

FIG. 2 is a sectional view showing an example of a pipe heat insulating material manufactured by the manufacturing method of the present invention.

1' is a cylindrical thermoplastic resin foam, and 11 is a mating portion.

Further, 5 is a locking tool having a locking portion 51, and the locking portion 51.
51 can be locked to each other.

To use the heat insulating material for pipes, the abutting portion 11 is pushed open and the pipe is fitted onto the pipe, and then the locking tool is locked to complete the covering.

Since the manufacturing method of the present invention is as described above, a pipe heat insulating material made of a cylindrical thermoplastic resin foam to which a locking tool is fixed can be easily and continuously manufactured from a plate-shaped thermoplastic resin foam. It is possible to manufacture heat insulating materials of any length, from short to long.

Also, if you manufacture a long insulation material and then cut it to make a short insulation material, the locking tool will not protrude beyond the end of the foam or be shorter than the foam, so the end A suitable heat insulating material can be obtained without any processing.

In addition, when fixing the locking tool to the foam, the locking parts of the locking tool are locked together, so the locking parts of the locking tool are fixed at appropriate positions on the foam where they can be locked together. As in the case of fixing one piece at a time with the locking parts released, the two pieces may become too far apart from each other and stick together, making it impossible for the locking parts to lock together. Even if the two pieces are fixed too close to each other and the locking portions are locked together, there is no risk of creating a gap in the abutting portion.

Since the heat insulating material obtained by the manufacturing method of the present invention is a thermoplastic resin foam molded into a cylindrical shape, it is lightweight, has an excellent heat insulating effect, and can be easily attached to a pipe. It can be suitably used as a heat insulating material.

[Brief explanation of the drawing]

FIG. 1 is a process diagram showing an example of the manufacturing method of the present invention. FIG. 2 is a sectional view of the obtained pipe heat insulating material. 1...Plate-shaped thermoplastic resin foam, 1'...
...Tubular thermoplastic resin foam, 11...Butting sound ts, 2'...Dice, 3...Butting part fitting tool, 4, 7, 16-... ... Hot air supply device, 5 ... - -f, tl = tool, 51 ... Locking part, 6 ... Pressure roll, 3 ... Cold air supply Device, 9...Katsutani, 10...
Insulating material for pipes, 12, 13... Roll, 14
, 15 , 17 , 17', 19 , 19'...
...Feed roll, 18,18'...press forming roll.

Claims (1)

[Claims] 1. Both side surfaces of a plate-shaped thermoplastic resin foam are brought together and deformed into a cylindrical shape, and 2.
The plate-like plate is made up of pieces and each piece has a locking part that can be locked to each other, and the locking tool is fixed one piece at a time with the locking parts locked together, and the plate shape is transformed into a cylindrical shape. A method for manufacturing a heat insulating material for pipes, characterized in that the internal stress that causes a thermoplastic resin foam to restore its shape to a plate is removed by heating. 2. The manufacturing method according to claim 1, wherein the thermoplastic resin is polyethylene. 3 Claim 1 in which the locking tool is made of thermoplastic resin
Manufacturing method described in section. 4. The manufacturing method according to claim 1 or 3, wherein the fastener is fixed by heat fusion. 5. The manufacturing method according to claim 1, wherein the heating for removing internal stress is performed by passing the cylindrical thermoplastic resin foam through a heating region after the locking tool is fixed. .