CN106594411B

CN106594411B - Polyethylene polypropylene reinforced composite double-wall corrugated pipe

Info

Publication number: CN106594411B
Application number: CN201710002838.8A
Authority: CN
Inventors: 曹能健
Original assignee: Shanghai Ruihuang Pipe Technology Co Ltd
Current assignee: Shanghai Ruihuang Pipe Technology Co Ltd
Priority date: 2017-01-03
Filing date: 2017-01-03
Publication date: 2020-02-07
Anticipated expiration: 2037-01-03
Also published as: CN106594411A

Abstract

The invention relates to a polyethylene polypropylene reinforced composite double-wall corrugated pipe, which overcomes the defect that the conventional double-wall corrugated pipe is made of HDPE materials and has higher cost. Polyethylene and polypropylene can not bond each other, and the inner tube is held tightly through the shrink mode to the outer tube for polyethylene pipe and polypropylene pipe can compound into an organic whole pipe, remain the performance of polyethylene material, again can make full use of the characteristic of polypropylene material simultaneously, reduce the polyethylene quantity simultaneously, replace with the polypropylene that the price is low, reduction in production cost.

Description

Polyethylene polypropylene reinforced composite double-wall corrugated pipe

Technical Field

The invention relates to a polyethylene polypropylene reinforced composite double-wall corrugated pipe.

Background

The double-wall corrugated pipe is a new type pipe material with ring structure outer wall and smooth inner wall, and is a new type light pipe material using high-density polyethylene (HDPE) as raw material, and has the characteristics of light weight, high pressure resistance, good toughness and quick construction, etc. and can be used for replacing concrete pipe and cast iron pipe.

However, due to the structural characteristics of the double-layer arms, the outer wall and the inner wall are made of the same material, so that at present, the outer wall and the inner wall of the double-wall corrugated pipe are made of PE (polyethylene) materials, the price of the PE materials is high, the double-layer corrugated pipe made of the full PE materials can obtain good performance, but the production cost is high, and the full PE pipe cannot meet the requirement of high strength in some occasions needing high strength.

Disclosure of Invention

The invention overcomes the defects that the existing double-wall corrugated pipe is made of HDPE material and has higher cost, and provides the polyethylene polypropylene reinforced composite double-wall corrugated pipe.

The invention also solves the defect that the inner wall and the outer wall of the existing double-wall corrugated pipe are both PE pipes and cannot be used in occasions requiring high strength, and provides the polyethylene polypropylene reinforced composite double-wall corrugated pipe which combines PP and PE, and makes full use of the high strength performance of PP in addition to the performance of PE.

The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a compound double-walled bellows of polyethylene polypropylene reinforcing, includes the inner tube that has smooth inner wall and the outer tube that has the loop configuration, and the inner tube structure of becoming is held tightly with the shrink mode to the outer tube, and the inner tube adopts the polyethylene pipe, then the outer tube adopts the polypropylene pipe, and perhaps the inner tube adopts the polypropylene pipe, then the outer tube adopts the polyethylene pipe. Polyethylene and polypropylene can not bond each other, and the inner tube is held tightly through the shrink mode to the outer tube for polyethylene pipe and polypropylene pipe can compound into an organic whole pipe, remain the performance of polyethylene material, again can make full use of the characteristic of polypropylene material simultaneously, reduce the polyethylene quantity simultaneously, replace with the polypropylene that the price is low, reduction in production cost.

Preferably, the inner pipe is a PP pipe, the outer pipe is a PE pipe, and the PE pipe embraces the PP pipe in a manner that the shrinkage rate is greater than that of the PP pipe.

Preferably, the inner pipe is a PE pipe, the outer pipe is a PP pipe, and the PP pipe embraces the PE pipe in a mode that the shrinkage rate of the PP pipe is larger than that of the PE pipe.

Preferably, the inner pipe is a cooling shaping pipe, and the outer pipe is extruded outside the cooling shaping pipe and is cooled, shrunk and tightly held to the inner pipe.

Preferably, the outer wall of the inner pipe is provided with a convex rib along the axial direction, the inner wall of the outer pipe is provided with a groove along the axial direction, and the groove is matched with the convex rib.

Preferably, the number of the convex ribs is four, and the four convex ribs are arranged at intervals of 90 degrees.

Preferably, the section of the convex rib is rectangular, the section of the groove is rectangular, the depth of the groove is greater than the height of the convex rib, and a channel communicated with the annular structure of the outer pipe is formed between the outer side edge of the convex rib and the bottom of the groove.

Preferably, the groove is of a segmented configuration along the outer tube axis, the groove connecting the two annular structures in axial communication.

Preferably, the inner tube is a white tube and the outer tube is a green tube.

The invention has the beneficial effects that: the outer tube is tightly held with the inner tube in a contraction mode, so that the polyethylene tube and the polypropylene tube can be compounded into an integrated tube, the performance of the polyethylene material is reserved, the characteristics of the polypropylene material can be fully utilized, the polyethylene consumption is reduced, the polypropylene with low price is used for replacing, and the production cost is reduced.

Drawings

FIG. 1 is a schematic diagram of one configuration of the present invention;

FIG. 2 is a schematic cross-sectional view of the present invention;

in the figure: 1. inner tube, 2, outer tube, 3, annular structure, 4, protruding muscle, 5, groove.

Detailed Description

The technical solution of the present invention is further specifically described below by using specific embodiments and with reference to the accompanying drawings.

Example 1: a polyethylene polypropylene reinforced composite double-wall corrugated pipe (see figure 1) comprises an inner pipe 1 with a smooth inner wall and an outer pipe 2 with an annular structure 3, wherein the inner pipe is a cooling sizing pipe, and the outer pipe is extruded outside the cooling sizing pipe and cooled, contracted and clasped to the inner pipe to form an integral structure.

The inner pipe is a white PP pipe which is shaped by cooling, and the outer pipe is a green PE pipe which is extruded outside the PP pipe and tightly clasps the PP pipe after cooling and shrinking.

Example 2: a polyethylene polypropylene reinforced composite double-wall corrugated pipe is different from the embodiment 1 in that: the inner pipe is a white PE pipe which is shaped by cooling, and the outer pipe is a green PP pipe which is extruded outside the PE pipe and tightly clasps the PE pipe after cooling and shrinking.

Example 3: a polyethylene polypropylene reinforced composite double-wall corrugated pipe (see fig. 2) is different from the above embodiment in that: the outer wall of the inner pipe 1 is provided with a convex rib 4 along the axial direction, the inner wall of the outer pipe 2 is provided with a groove along the axial direction, and the groove 5 is matched with the convex rib. The four ribs are arranged at equal angular intervals, and in the embodiment, the four ribs are arranged at intervals of 90 degrees. The section of each convex rib is rectangular, the section of each groove is rectangular, the depth of each groove is greater than the height of each convex rib, and a channel communicated with the outer pipe annular structure 3 is formed between the outer side edge of each convex rib and the bottom of each groove. The groove is of a sectional structure along the axis of the outer pipe, and the groove is connected with two connected annular structures in the axis direction. The rest of the structure refers to other embodiments.

Example 4: a polyethylene polypropylene reinforced composite double-wall corrugated pipe is different from the embodiment 3 in that: the convex ribs and the grooves are not arranged at equal angle intervals, the number of the convex ribs is four, three of the convex ribs are mutually spaced by 20 degrees, and the interval between the fourth convex rib and the middle one of the three convex ribs is 180 degrees. The position of the groove corresponds to the position of the convex rib. The rest of the structure is referred to example 3.

The embodiments described above are merely preferred embodiments of the present invention, which is not intended to be limiting in any way, and other variations and modifications are possible without departing from the scope of the invention as set forth in the claims below.

Claims

1. A polyethylene polypropylene reinforced composite double-wall corrugated pipe is characterized by comprising an inner pipe with a smooth inner wall and an outer pipe with an annular structure, wherein the outer pipe tightly holds the inner pipe in a contraction mode to form an integral structure, the inner pipe is a polyethylene pipe, and then the outer pipe is a polypropylene pipe, or the inner pipe is a polypropylene pipe, and then the outer pipe is a polyethylene pipe; the inner pipe is a cooling shaping pipe, and the outer pipe is extruded outside the cooling shaping pipe and is cooled, contracted and tightly held with the inner pipe; the outer wall of the inner pipe is provided with a convex rib along the axial direction, the inner wall of the outer pipe is provided with a groove along the axial direction, and the groove is matched with the convex rib; the section of the convex rib is rectangular, the section of the groove is rectangular, the depth of the groove is greater than the height of the convex rib, and a channel communicated with the annular structure of the outer pipe is formed between the outer side edge of the convex rib and the groove bottom.

2. The polyethylene polypropylene reinforced composite double-wall corrugated pipe as claimed in claim 1, wherein the inner pipe is a PP pipe, the outer pipe is a PE pipe, and the PE pipe tightly embraces the PP pipe in a manner that the shrinkage rate of the PE pipe is greater than that of the PP pipe.

3. The polyethylene polypropylene reinforced composite double-wall corrugated pipe as claimed in claim 1, wherein the inner pipe is a PE pipe, the outer pipe is a PP pipe, and the PP pipe tightly embraces the PE pipe in a manner that the shrinkage rate of the PP pipe is greater than that of the PE pipe.

4. The polyethylene polypropylene reinforced composite double-wall corrugated pipe as claimed in claim 1, 2 or 3, wherein the number of the ribs is four, and the four ribs are arranged at intervals of 90 °.

5. A polyethylene polypropylene reinforced composite double wall corrugated pipe according to claim 1, 2 or 3, wherein the grooves are segmented along the axis of the outer pipe, and the grooves are connected with two annular structures in the axial direction.

6. The polyethylene polypropylene reinforced composite double-wall corrugated pipe as claimed in claim 1, 2 or 3, wherein the inner pipe is white pipe and the outer pipe is green pipe.