JPS61181628A - Manufacture of corrugated pipe - Google Patents

Abstract

PURPOSE:To make it possible to mold a corrugated pipe with any diameter without using a mold, by corrugating a laminate pipe having an inner layer, an intermediate layer and an outer layer, and then removing the inner layer and the outer layer. CONSTITUTION:A metal belt 1, an unvulcanized rubber tape 2 and a metal belt 3 in the stated order with the metal belt 1 innermost are interposed between a cantilevered mandrel 11 and an endless belt 12 wound around the mandrel 11 and driven by driving rollers 13, 13 and are wound helically around the mandrel 11 to be molded into a tubular body while the tubular body is rotated and moved forward, so that a laminate pipe (P) having an inner layer 4, an intermediate layer 5 and an outer layer 6 is molded. Rollers each with grooves are pressed to the inner surface and the outer surface of the laminate pipe (P) to deform plastically the metal belts 1, 3 forming the inner and outer layers 4, 6 to be corrugated. Then the laminate pipe is cut in lengths, and the obtained sections are charged in a heating furnace to heat and vulcanize the unvulcanized rubber of the intermediate layer 5. Then the metal belts 1, 3 constituting the inner and outer layers 4, 6 not adhered to the intermediate layer 5 are separated and removed from the intermediate layer 5 to give a corrugated pipe (T) comprising a vulcanized rubber.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for manufacturing a corrugated tube made of rubber or plastic, in which the vertical section of the tube wall is formed into a corrugated shape to impart good flexibility.

(Prior art) Conventionally, the method of forming corrugated tubes made of polymeric materials is as follows:
For example, as in JP-A-57-11661, a plastic pipe extruded from an extruder is introduced into a molding tunnel consisting of a large number of movable molding pieces formed with semicircular uneven surfaces facing each other, and the It is known to form a predetermined wavy shape by spreading it out on a molding piece.

(Problem to be Solved by the Invention) However, in the above molding method, each time there is a change in the diameter or waveform shape of the corrugated pipe to be molded, the movable waveform piece, which is the molding die, must be manufactured in accordance with the change. However, there were problems in that it required a considerable amount of cost and time to manufacture, and had disadvantages in forming the corrugated tube.

(Means for Solving the Problems) The purpose of the present invention is to solve the above problems and provide a new manufacturing method that can mold a corrugated pipe of any diameter without using a molding die. The gist of the method is to form a laminated tube having inner and outer layers made of a sticky and deformable material such as thin metal and an intermediate layer made of rubber or plastic, and to shape the laminated tube into a corrugated shape. The present invention provides a method for manufacturing a corrugated tube, comprising the step of peeling and removing the inner and outer layers from the laminated tube.

(Example) An embodiment of the present invention will be described below.

Figure 1 shows the process of forming a laminated tube (Pl) formed by spirally winding a metal strip such as aluminum foil and an unvulcanized rubber tape. A metal strip (11
, by sequentially inserting the unvulcanized rubber tape (2) and the metal strip (3) from the inside, and rolling them spirally on a mandrel 0υ to form a tubular body while rotating them forward on the mandrel 0υ. , forming a laminated pipe port having an inner layer (4), an intermediate layer (5) and an outer layer (6).

At this time, the metal strips (1) (3) are subjected to type 1 treatment on the surface facing the unvulcanized rubber tape (2), and the inner and outer layers (4) (6) and the intermediate layer (5) are is not glued.

Note that the formation of the laminated pipe opening is not limited to the above embodiment, and instead of the metal strip, a strip made of other plastically deformable material may be used, or the tube body may be formed by winding the strip in a spiral shape. Alternatively, the intermediate layer (5) may be formed by spirally winding a tape impregnated with unvulcanized rubber around a base fabric such as glass cloth, and polymerizing the side edges thereof. Alternatively, it may be formed by spirally winding various thermoplastic or thermosetting plastic tapes.

FIG. 2 shows the state in which the pipe wall of the laminated pipe opening formed as described above is shaped into a spiral or annular waveform in the longitudinal section,
The process of giving a shape to this waveform is performed by, for example, the mandrel 0
A roller having uneven grooves is pressed against the inner and outer surfaces of the laminated pipe opening leaving the tip of the mandrel aυ by rotating forward on the mandrel aυ,
Metal strips (1) (3) forming inner and outer layers (4) f6)
1 is plastically deformed into an uneven shape with the intermediate layer (5) sandwiched between them, but other known means capable of shaping the pipe wall into a corrugated shape may also be used.

Moreover, this process of forming a shape may be performed continuously with the laminated tube forming process as described above, or may be performed discontinuously.

The laminated tube whose tube wall is shaped into a corrugated shape as described above is canted to a specified length and then placed in a heating furnace, where the unvulcanized rubber forming the intermediate layer (5) is heated and vulcanized.

In addition, in this heating and vulcanization step, the corrugated laminated tube may be advanced and passed through a heating furnace installed in front, so that the forming may be performed continuously with the process. When the intermediate layer is made of thermoplastic,
Needless to say, it's not necessary.

Thereafter, the laminated pipe opening is formed from the intermediate layer (5) to the inner and outer layers in a non-adhered state +41 (61 metal strips (1) (3
By peeling and removing 1, a corrugated tube (1) made of vulcanized rubber plastically deformed into a corrugated state is obtained, as shown in FIG.

In the present invention, the laminated tube consisting of the inner and outer layers and the intermediate layer is not limited to the above-mentioned embodiments, and may be formed by any method. It may also be formed by joining a seam in the axial direction.

(Operations and Effects of the Invention) As explained above, according to the present invention, a tube wall made of a polymeric material such as rubber can be plastically deformed into an uneven shape along with the inner and outer layers without using a mold. In addition to being able to easily form corrugated pipes with the desired diameter, it is also possible to use heat-resistant plastics such as polyimide, PPS, and PBT, which are difficult to melt-mold, unlike general thermoplastics. It has the advantage of being able to manufacture corrugated tubes with good flexibility, and is of great industrial value.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing the forming process of the laminated pipe of the present invention, Fig. 2
The figure is a side view of the laminated pipe showing a state in which the corrugated pipe is shaped, and FIG. 3 is a partially cutaway side view of the corrugated pipe. (11 (31... Metal strip, (2)... Unvulcanized rubber tape, (4)... Inner layer, (5)...
Middle layer, (6)...Outer layer, η...Laminated pipe,
■...Corrugated tube. Figure 2 P Figure 3 Proceedings Amendment Date Q/3Q, 1986

Claims (1)

[Claims] forming a laminated tube having inner and outer layers made of a plastically deformable material such as thin metal and an intermediate layer made of rubber or plastic, and shaping the laminated tube into a corrugated shape;
A method for manufacturing a corrugated tube, comprising the step of peeling and removing the inner and outer layers from the laminated tube.