JPS6213890A - Manufacture of plastic hose - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Background and Objectives of the Invention] The present invention relates to a method for manufacturing a plastic hose, and more specifically, a method for manufacturing a plastic hose, and more specifically, a method for manufacturing a plastic hose, and more particularly, a method for manufacturing a plastic hose, and more particularly, a method for manufacturing a plastic hose by integrally paralleling a plurality of so-called hoses, such as twin hoses and three-piece hoses. The present invention relates to a method of manufacturing a plastic hose to be connected.

Combine multiple hoses that send gas, liquid, etc. into one,
The idea of simplifying the handling of hoses during material transportation and work has already been proposed, and prior art for combining multiple hoses into one is, for example, the Japanese Utility Model Publication No. 41-19.
No. 973, No. 42-16937, Special Publication No. 43-143
Publication No. 32 can be mentioned.

Figure 5 is a longitudinal sectional front view of a plastic hose (twin hose) manufactured by the conventional method (extrusion molding method).
To manufacture the plastic hose shown in Fig. 5, the outer periphery of each inner layer duplex a is coated with reinforcing IEib, and a thermoplastic outer layer sheath C is extruded around the outer periphery of the two blank tubes formed as described above. I'm trying to get a twin hose by covering it.

However, in order to manufacture a twin hose by an extrusion molding method, a specially shaped mouthpiece or die suitable for a hose take-off machine is required for extrusion coating of the outer sheath C.

Additionally, the above-mentioned problems are common to three-piece plastic hoses (Figure 6), and even when more plastic hoses are connected together in parallel using an extrusion molding method. In particular, as the number of raw tubes increases, not only the shapes of the caps and dies become more complicated, but also the size of the extrusion molding machine must become larger.

In addition, in Japanese Patent Publication No. 1983-5240 entitled "Method for manufacturing spiral plastic material", it is stated that "there is a slight slit in the annular part adjacent to the spirally wound plastic body, and the center of the contact point is Inject the molten thermoplastic resin with a nozzle etc.
However, the ``method for manufacturing plastic materials'' described in Japanese Patent Publication No. 40-5240 is only for making tea towels, as shown in the same publication. This invention relates to a manufacturing method for "swirl-shaped" plastic materials used in such applications, and is completely different in technical concept from the present invention described below.
"Method for manufacturing plastic materials" shown in Publication No. 40
According to , it is expected that the work of ``creating a slight slit in the adjacent annular portion of the spirally wound plastic body'' will be complicated.

The present invention enables relatively simple connection of multiple plastic materials to be joined in parallel without using an extrusion molding machine with a complicated structure, which was conventionally required for this type of work. The present invention aims to provide an economical method for manufacturing plastic hoses that can integrally connect twin hoses or a larger number of hoses in parallel using equipment.

[Summary of the Invention] In order to achieve the above object, the method for manufacturing a plastic hose according to the present invention includes arranging a plurality of plastic hoses to be joined in parallel, and simultaneously pulling the plurality of plastic hoses in one longitudinal direction. , the thermoplastic outer sheaths of adjacent hoses are melted using an electric heater plate, and then
It is characterized in that the melted outer sheaths are crimped and integrated.

[Example] Hereinafter, the present invention will be explained based on an example shown in Figs. 1 to 4, taking as an example the case of manufacturing twin hoses. Fig. 1 shows an example suitable for carrying out the method of the present invention. A second plan view showing a specific example of a plastic hose manufacturing device.
The figure shows a partially longitudinal side view of Fig. 1, Fig. 3 is a longitudinal sectional front view of a plastic hose (twin hose) manufactured by the method of the present invention, and Fig. 4 shows an opening at the end of the twin hose shown in Fig. 3. It is a side view of the state where the metal fittings are attached.

In FIGS. 1 and 2 showing the configuration of a plastic hose manufacturing apparatus, reference numerals 1 and 2 are plastic hoses to be joined, 3 and 4 are hose feeding frames that support the plastic hoses 1 and 2, and 5 and 6 are hose 1. , 2 in one longitudinal direction (in the direction of the arrow claw), 7, 7, . An electric heater plate is shown for melting the thermoplastic outer sheath of the hoses 1 and 2 that are pulled in the direction of the arrow claws by the hose pullers 5 and 6, and in FIGS. 1 and 2, the plastic melted by the electric heater plate 8 is shown. The molten outer sheaths of the hoses 1 and 2 are then crimped while passing between the hose take-off machines 5 and 6, and by performing the above operations continuously, A twin hose as shown in FIG. 3 is obtained. Examples of the twin hose shown in FIG. Yes, in that case,
The heating temperature of the outer sheath by the electric heater plate 8 is set to 150° C. or higher, which is the melting point temperature of polyurethane.

As is clear from the description of the illustrated embodiments, the present invention provides a method for arranging a plurality of plastic hoses to be joined in parallel, and simultaneously pulling the plurality of plastic hoses in one longitudinal direction, and simultaneously The thermoplastic outer sheaths are melted using an electric heater plate, and then the molten outer sheaths are crimped and integrated. Therefore, unlike conventional hoses, manufacturing of this type of hose requires complicated shapes of caps and dies. For example, even if the number of plastic hoses to be joined increases, there is no need to use an extrusion molding machine.
．． 7..., a large number of plastic hoses can be integrally connected in parallel using relatively simple equipment that only requires adding a new electric heater plate 8.

In carrying out the present invention specifically, the outer sheaths of adjacent hoses may be partially melted and crimped at intervals along the longitudinal direction of the sheaths.

Also, in order to actually use the plastic hose, please refer to the 4th step.
As shown in the figure, the hose is often used with a cap fitting 9 attached to the end of the hose. It is preferable to fuse and press the outer sheaths of adjacent hoses together (this is convenient).

Furthermore, in the present invention, at the same time as a plurality of plastic hoses to be joined are twisted together, an electric heater plate is rotated around the outer circumference of the hose, and the outer sheath of the adjacent hose is melted by the electric heater plate. After that, the two may be crimped.

In addition, in the present invention, there is no problem in using a hose material without a reinforcing layer for the 7'7 stick hose to be joined.

[Effects of the Invention] The present invention is as described above, and as is clear from the description of the illustrated embodiments, according to the present invention, when connecting a plurality of plastic hoses to be joined integrally in parallel,
It is economical because twin hoses or a larger number of hoses can be connected in parallel using relatively simple equipment without using extrusion molding machines with complicated structures that were conventionally required for this type of work. It is possible to provide an excellent method for manufacturing a plastic hose.

[Brief explanation of drawings]

FIG. 1 is a plan view showing a specific example of a plastic boce manufacturing apparatus suitable for implementing the method of the present invention, FIG. 2 is a partially longitudinal side view of FIG. 1, and FIG. Figure 4 is a longitudinal sectional front view of the manufactured Plus Deck hose (twin hose), Figure 4 is a side view of the twin hose shown in Figure 3 with a cap fitting attached to the end, and Figure 5 is a conventional method (extrusion molding method). ) Figure 6 is a vertical cross-sectional front view of a plastic hose (twin hose) manufactured by the conventional method (
FIG. 2 is a longitudinal cross-sectional side view of a plastic hose (three-piece connecting bow) manufactured by an extrusion molding method. 1 and 2...Plastic hose, 3 and 4...
- Hose feeding frame, 5 and 6... Hose take-up machine, 7.7... Hose guide roller, 8... Electric heater plate, 9... Fitting.

Claims (5)

[Claims] (1) A plurality of plastic hoses to be joined are arranged in parallel, and while the plurality of plastic hoses are taken in one longitudinal direction, the spaces between the thermoplastic outer sheaths of adjacent hoses are melted using an electric heater plate, and then, A method for manufacturing a plastic hose, characterized in that the molten outer sheath is crimped and integrated. (2) A method for manufacturing a plastic hose according to the invention as set forth in claim 1, in which the outer sheaths of adjacent hoses are partially melted and crimped at intervals along the longitudinal direction of the sheaths. (3) In the invention as set forth in claim 1 or 2, the plastic hose has a non-melting part at the end of the hose where the cap is attached, and melts and presses the outer sheaths of adjacent hoses together. Production method. (4) In the invention set forth in any one of claims 1 to 3, at the same time as the plurality of plastic hoses to be joined are twisted together, the electric heater plate is rotated around the outer periphery of the hoses, and the adjacent plastic hoses are twisted together. A method of manufacturing a plastic hose, in which the outer sheath of the hose is melted by the electric heater plate, and then the two are crimped. (5) In the invention according to any one of claims 1 to 4, a method for manufacturing a plastic hose in which a hose material without a reinforcing layer is used for the plastic hose to be joined.