JPS60168627A - Closing method of hole of porous plastic tube - Google Patents

Abstract

PURPOSE:To exactly close the holes of a porous plastic tube by a method in which the end of a porous plastic tube is heated for softening or melting, the inner wall or outer wall layer so softened or melted is pressed to form a pressed thin portion, and the pressed thin portion is inversely curled to close the hole in the end face. CONSTITUTION:The end of a plastic tube 1 having an axially formed through hole 13 in the its wall is heated to soften or melt the end portion, and the inner wall layer 11 or outer wall layer 12 of the end portion so softened or melted is pressed for closing. The thin portion so pressed is inversely curled toward the inside or outside of the tube 1 to close a through hole 13 formed in the end portion of the tube 1. The through hole of the porous plastic tube can thus be exactly closed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field) The present invention is directed to a plastic pipe having a large number of holes in the pipe wall in the pipe axis direction (hereinafter referred to as "porous plus book pipe"). Is there a way to reliably close the opening?
Ill.

(Prior art) This type of perforated Plus Deck pipe has through holes in the pipe wall, which allows it to save plastic material and reduce the weight of the pipe, and also increases the rigidity of the pipe by increasing the thickness of the pipe wall. It has the advantage of being able to be enhanced.

For this reason, porous plastic pipes are used as underground piping.

By the way, the connection between these porous plastic pipes is similar to the conventional connection between pipes without holes.The diameter of the end of one pipe is enlarged and a socket is installed. Connections are made by inserting the ends, but with porous plastic pipes, the inside and outside of the pipe communicate through holes in the pipe wall, so fluid inside the pipe may leak or groundwater such as rainwater may leak. It may flow into the pipe.

In order to solve this problem, conventional ICs were made by heating and softening the end of a porous plastic tube and then crushing the end to close the hole, but the hole was not opened completely. .

That is, the pipe wall is crushed and the inner wall layer and outer wall layer are brought into close contact with each other.
If you just block the hole, the blockage will vibrate! I! I
When subjected to impact, etc., the inner wall layer and outer wall layer peel off *11. The fluid in the pipes sometimes leaked.

(Purpose of the Invention) The present invention solves the problems of the conventional υJ closing method described above, and it is possible to reliably close the through hole and to prevent the fluid in the pipe from flowing even when vibrations, shocks, etc. are applied. This provides a method for closing the hole without causing leakage.

(Structure of the invention) Hereinafter, the specific configuration of the present invention will be explained with reference to the drawings.

Fig. 1 is a partial front view of a porous plastic tube, Fig. 2 is a half-sectional view of the main part showing the crushing process of the present invention, Fig. 3 is a half-sectional view of the main part showing the inversion curling process, and Fig. 4 is a half-sectional view of the main part showing the crushing process of the present invention. FIG. 5 is a half-sectional view of the main part of the closed end obtained by the present invention, and FIG. Crushing mold, 3 is inversion mold, 1
1 is an outer mold, and 5 is an inner mold.

The porous plastic pipe 1 is made of a plastic material such as vinyl chloride resin or polyethylene resin. The plastic pipe 1 has a circular cross section, an oval shape, or any other suitable shape, and has an inner wall layer 11 and an outer wall layer 12, as shown in FIG. It has a configuration in which a large number of through holes 13 are connected by a partition wall 14 and communicated in the tube axis direction.

In the closing method of the present invention, as shown in FIG. 2, the end of the porous plastic tube 1 is heated to soften or melt, and the tube end is crushed in a crushing mold 2.

The crushing mold 2 has an annular groove 21 into which the end of the porous plastic tube 1 is inserted, and a surface 22 that slopes from the inner circumferential side to the outer circumferential side is provided at the back of the annular groove 21. This inclined surface 22 is coated with Teflon resin or the like, and a heater 23 is buried near it.

Therefore, when the end of the tube 1 is inserted into the annular groove 21, it softens or melts, and the end of the inner wall layer 11 becomes the inclined surface 21.
2 ran over me and crushed me, and I was crushed! ? 12 Close contact. In this crushing step, the end of the plastic tube is heated and softened in advance, and then the tube end is placed in a crushing mold 3.
It's like pushing it inside.

Next, as shown in Fig. 3, this crushed tube end is pushed into the inversion mold 3, and the thin end part is inverted and curled.
Ru.

The inversion mold 3 has a circular arc portion 32 formed at the back of the annular groove 31 into which the end of the tube 1 is inserted, and when the tube end is inserted, the thin end portion thereof comes into contact with the circular arc portion 32. Then reverse the curl.

In addition, in this reversal process, the thin part of the tip to be reversed and curled is further heated and melted, and then pushed into the reversal mold 3 and reversed, the welding becomes even stronger and the through hole rRJ is reliably closed. It's so sad.

Thus, as shown in FIG. 4, the through hole 13 opened at the end of the multi-hole Plus Deck tube 1 is reliably #INed.

In the embodiment shown in FIGS. 2 and 3, the inner wall layer 11 of the porous plastic tube 1 is crushed and brought into close contact with the outer wall layer 13, and the thin end portion is reversely curled inside the tube. However, the hole closing method of the present invention is not necessarily limited to this; on the contrary, the outer wall layer 12 is crushed and brought into close contact with the inner wall layer 11, and the thin end portion is formed into a tube. It is also possible to invert the curl to the outside of '1.

Additionally, this hole closing method can be applied to the ends of straight pipes (
] Instead, it can also be applied to the case where the diameter of the end of a straight pipe is expanded to provide a socket, and a through hole opened in the end face of the socket is closed.

FIG. 5 shows another embodiment of the crushing process most suitable for closing and covering the through hole at the same time as this socket forming,
In this case, after the end of the porous Plus Deck tube 1 is heated to avoid softening, an inner mold 5 is press-fitted into the end of the tube to provide a socket. At this time, the tip of the socket rides on the step 51 of the inner mold 5 and the inner wall layer 11 is crushed, so the outer mold 4 is placed on the tip and the inner wall layer 11 and the outer ami 2 are tightly bonded. Shout out.

Then, as explained in the previous embodiment, the through hole 13 is reliably closed by pushing it into the inverted mold 3 shown in FIG. 3 and inverting and curling the thin end portion thereof.

(Effects of the Invention) As detailed above, the through-hole closing method of the present invention involves heating the end of a plastic pipe to soften or melt the rust, and then crushing the end of the pipe to remove the inner wall layer and the outer layer. The 4M layer is brought into close contact with the 4M layer, and then the thin end of C is inverted and curled to the inside or outside of the tube to ensure that the hole is blocked, even if it is caused by vibration! There is no fear that this closed part will peel off and cause a l/iJ opening even if it is subjected to a blow or the like.

[Brief explanation of drawings]

Fig. 1 is a partial front view of a porous plastic tube, Fig. 2 is a half-sectional view of the main part showing the crushing process of the present invention, Fig. 3 is a half-sectional view of the main part showing the downward direction of reverse curl, and Fig. 4 5 is a half-sectional view of a main part of a closed part obtained by the method of the present invention, and FIG. 5 is a half-sectional view of a main part showing another embodiment of the crushing step of the present invention. 1... Porous plastic pipe 11...
Inner wall layer 12... Outer wall layer 13... Through hole 2... Squeezing mold 3... Reversing mold 4
・・・・・・Outer type 5・・・・・・Inner type A 1 Nagi lno 4 Male 2 Figure Akira 3 Figure Mawara 4 Figure 5

Claims (1)

[Claims] After heating the end of a plastic pipe that has a large number of holes in the pipe axis direction in the pipe wall to soften or melt it, the inner wall layer or the outer wall layer of the pipe end is crushed, and then the crushing is performed. IRJ plugging method for a through hole in a porous plastic pipe, characterized in that the thin walled part is reversely curled to the inside or outside of the pipe to close the through hole opened at the end of the pipe.