JPS5850178B2 - How to form a flange on a synthetic resin pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for integrally forming a flange on a synthetic resin pipe.

Conventionally, methods for integrally forming a flange on a synthetic resin pipe include welding a separately manufactured flange plate to the synthetic resin pipe, or extruding a strip of resin made of the same material as the synthetic resin pipe from an extruder in a hot molten state. Among them, there is a method of wrapping or stacking synthetic resin pipes to a certain height to form a single body.

However, the former requires a large number of manufacturing steps, such as the process of separately manufacturing the flange plate and the process of welding it to the synthetic resin pipe, while the latter requires post-processing because the resin protrudes from the side of the formed flange.

In addition, in order to prevent the resin from seeping out, a pair of collar-shaped molds that are opposed to each other at the width of the flange to be formed are attached to the synthetic resin pipe. It is possible to wrap or laminate the resin, but this would be uneconomical as it would require separate molds for each pipe diameter and flange height, and for large diameter pipes, the molds would also become larger and the weight would increase. However, attaching and detaching is not only dangerous but also involves a lot of operational loss.

The present invention is a method of forming a flange by winding or laminating synthetic resin, and its purpose is to make the work safe and easy, and to prevent the resin from protruding onto the sides of the formed flange. The goal is to prevent this and reduce post-processing.

In order to achieve the above object, the present invention forms a mold by wrapping a flat belt around a synthetic resin pipe to a certain height, and wraps the synthetic resin between the molds installed at a certain interval. Or, after laminating and integrating with a synthetic resin pipe, the flat belt is rewound to form a flange.

Next, embodiments of the present invention will be described with reference to the drawings.

In the drawing, 1 is a thermoplastic synthetic resin pipe, 2.2
Reference numeral 1 denotes a flat belt wrapped around a synthetic resin pipe 1, and the interval between the rolled flat belts 2 and 21 becomes the width of the flange formed, and the height of the rolled up belt becomes the height of the flange.

First, the surface of the synthetic resin pipe 1 between the flat belts 2 and 2' is heated and melted, and a hot molten resin of the same material as the synthetic resin pipe 1 extruded from an extruder in the form of a belt is wrapped around it to form a flange. form 3.

After the flange 3 formed by rolling the resin cools down and becomes integrated with the synthetic resin pipe 1, the flat belt 2.2' is unwound and removed.

4 is a pressure roll that presses the rolled up resin, and 5 is a reinforcing cylinder for the synthetic resin pipe 1, which is used to prevent the synthetic resin pipe 1 from deforming due to contraction when the rolled up resin cools. In addition, when forming the end flange 3 of the synthetic resin pipe 1, the flat heald 2 is rolled up.

Furthermore, when forming a flange on an FRP pipe, it is possible to similarly set up a mold using a flat belt and sequentially laminate the molds while impregnating the base material with resin.

When wrapping a flat belt around a synthetic resin pipe, the work can be done safely and easily by unwinding the flat belt that has been wrapped around a drum-shaped object and wrapping it around the synthetic resin pipe one after another. You can do the opposite.

As described above, according to the present invention, there is no need to prepare various molds for each pipe diameter and flange height, and molds can be made freely by winding flat belts, making it possible to create synthetic resin pipes. Even if the surface is slightly uneven, there is no problem, and the work is safe and easy.

Furthermore, by using a mold, the post-processing is simple, with no small amount of resin spilling out onto the sides of the molded flange, and the industrial value of the present invention is considerable.

[Brief explanation of drawings]

The drawing is an explanatory diagram showing a state in which a flange is formed on a synthetic resin pipe according to the present invention. 1 is a synthetic resin pipe, 2.2' is a flat belt, and 3 is a flange.

Claims (1)

[Claims] 1 Create a mold by wrapping a flat belt around a synthetic resin pipe, wrap or laminate the synthetic resin between the molds installed at regular intervals, and remove the flat belt after integrating with the synthetic resin pipe. A method for forming a flange on a synthetic resin pipe, characterized by: