JPS5991023A - Method of covering pipe - Google Patents

Abstract

PURPOSE:To absorb physical and mechanical shocks that will act on a pipe by using a reticulate sheet thereby providing an insufficient protective function of a pipe outer surface, by sandwiching the reticulate sheet between two resin sheets, and winding them around the outer circumference of the pipe. CONSTITUTION:On the one hand a resin 11 in a heated state is extruded from an extruder 2 via a path 5, on the other hand a resin 13 in a heated state is extruded from an extruder 3 via a path 6 and the reticulate sheet 14 is inserted into a path 8. Thus, the reticulate sheet 14 is sandwiched between the sheetlike resins 11, 13 at a wide lip section 4 thereby forming a belt-shaped composite sheet 16 including the adhesive layer 12, the reticulate layer 15 and the covering layer 10. When by rotating circumferentially the pipe 9 the composite sheet 16 is wound helically around the pipe with the adhesive layer 12 stuck on the outer surface of the pipe 9, the pipe 9 is covered with the adhesive layer 12, the reticulate layer 15 and the covering layer 10 in the stated order at the same time. Thus due to the concerted effect of the layers and in particular due to the shock resistance of the reticulate layer 15, defect would not be formed by shock on the composite sheet.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for covering a tube, and more particularly to a method for restoring a tube by wrapping a coating layer around the outer circumference of the tube.

Conventionally, in order to protect my external surface, I extruded a double-layered resin sheet into a strip using an extrusion method, using a single layer or an adhesive layer, and wound this in a spiral shape outward in a 1∆ direction.
There is something to cover. As an example, JP-A-50-14
8488 There is something shown in the bow publication. However, from the perspective of Part 2, covering only with persimmon fat sheet is physically harmful.

Scratches are likely to occur due to mechanical shock, and the protection function of the outer surface of the pipe is insufficient.Repairing the spoon requires a lot of time and effort, and the restored part is in poor condition compared to other parts. has the problem of oxidation.

Therefore, the present invention improves the conventional V! The purpose of this is to prevent the occurrence of flaws during transportation, loading, or installation, such as those found in tubes with layers wrapped around them. .

In order to achieve this object, the present invention sandwiches a reticulated sheet between two continuously extruded resin sheets to form three layers, and wraps the ribs around the outer circumference of the tube.

Therefore, the mechanical impact acting on the table can be reliably absorbed by the reticulated sheet, thereby preventing the skin generated on the coating from reaching the outer surface of the tube. Not only can it provide sufficient protection, but it also eliminates the need for conventional repair time and labor.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

In Figure 1, (1) is an extruder with a set of screws (2)
(3) is the connected die, each extrusion m (2) (
Resin passageway (5) leading from 3) to the horizontally long lip part (4)
(6). On the other hand, from the maple end (7) of the die (1) to the lip part (4), there is a channel N (8) for the CS mesh sheet.
is penetrated.

(9) is the tube to be coated.

Extrusion (°C 1 to 1 from the resin passage (5)
4υ" resin (1υ) is pumped to form the resin. Polyethylene, polypropylene, chlorinated vinyl, and nylon are also used as this resin. Resin 01 is pumped into the finger passageway to form an adhesive that adheres directly to the outer surface of the tube.

As this resin 0:9, a material that warps on contact, such as chemically modified polyethylene, chemically modified polypropylene, or vinyl chloride, is used.

0.V is the rear end of the die (7
) to 11'8 (8) It is a 14-shaped sheet inserted into the wire mesh.

Punch metal, glass & II fibers, fluorinated ethylene resin (Teflon) fibers, etc. are used.

The coating method will be explained. Extruder (from 2 in. to kr (5)
The resin Qυ is extruded in a heated state, and an extruder (3
0.1 of the resin is extruded under heat into the illumination passage (6) from ), and the reticulated sheet is inserted into the passage (8). Then, in the horizontally elongated lip part (4), the mesh sheet 0Φ is sandwiched between the C1 sheet-like sleeve J fat un'4, and the adhesive layer □□□, the mesh layer One band-shaped composite sheet QQ consisting of .

The tube (9) is rotated in the circumferential direction, and the connecting layer c';
The composite sheet 0 (9) is wound spirally around the outer circumference of the tube so that it touches the outer surface of the tube (9).Then, as shown in FIG. It)
They will be coated at once in this order.

In this way, the misalignment is caused by the combined effect of each J1, and especially by the lj impact resistance effect of the Kfd layer Orj, which prevents the occurrence of flaws due to impact.

In addition, in the above embodiment, a die (1
), but even if one of the resins OJ) or 0 and 1 and the reticulated sheet 0- are first merged, the other &I resin 03 or 0υ is later merged. good.

As described above, according to the present invention, the physical and mechanical impact forces acting on the bean paste can be reliably absorbed by the sheet, and the scratches generated in the coating waste can be absorbed. It is possible to meet the external surface of the tube, and not only can a sufficient protective function of the external surface of the tube be obtained, but also the time and labor required for conventional repairs can be saved.

[Brief explanation of drawings]

Fig. 1 is a diagram showing an embodiment of the present invention, Fig. 2 is an enlarged view of the main parts. (9)...g, cut...coating waste, 0υ...resin,
(2)...Adhesion J91.0;1...Resin, α◆...
・Mesh sheet. Agent Yoshihiro Morimoto Figure 1 Figure 2 Continued from page 1 7 Inventor Yoshinori Ichikawa 7-1 Tonen Petrochemical Co., Ltd., 4-1-1 Tsukiji, Chuo-ku, Tokyo Applicant: Yokohama Chemical Machinery Co., Ltd. 4-6-13 Tsunashima Higashi, Kohoku-ku, Yokohama

Claims (1)

[Claims] 1. There is a gap between two continuously extruded resin sheets.
Pipe coating method 1゜ characterized by sandwiching a U-shaped sheet to form three layers and winding this around an extra-tube FJ.