Non-pressure-bearing polyethylene drainage pipe and production method thereof

Abstract

The invention relates to the technical field of non-pressure-bearing polyethylene drainage pipes, and discloses a non-pressure-bearing polyethylene drainage pipe which comprises a core layer, an inner layer is arranged in the core layer, and an outer layer is arranged outside the core layer. High-density polyethylene and low-density polyethylene are used as raw materials, the chemical resistance and impact resistance of the pipe are improved, the stability and long-term durability of a drainage system are ensured, and the production process comprises the steps of mixing the materials according to the proportion of 7: 3, heating to 170 DEG C for melting, extruding, drawing and forming, cooling to 20 DEG C, spraying codes and printing product marks, and detecting a semi-finished product after cutting. According to the method, the production process is optimized, the product quality is improved, the repair rate is greatly reduced, the production efficiency is improved, reasonable allocation of resources is realized, the production cost is reduced, the production efficiency is improved, the production cost is reduced, the production efficiency is improved, the production cost is reduced, the production cost is reduced, and the production efficiency is improved. And the waste in the production link is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of non-pressure polyethylene drainage pipes, in particular to a non-pressure polyethylene drainage pipe material and a production method thereof. Background Art

[0002] Drain pipes are mainly used for drainage of rainwater, sewage, farmland irrigation and drainage, etc. They are generally used for non-pressure pipes, such as sewage pipes and rainwater pipes. Direct burial is adopted for construction. Drain pipes are new-type permeable drainage plastic pipes with a corrugated appearance formed by adding other additives to high-density polyethylene (HDPE). Permeable corrugated pipes are made by punching holes in the grooves and wrapping the outer periphery of the pipe with needle-punched geotextiles. According to the type of corrugated pipes, they can be divided into single-wall permeable corrugated pipes and double-wall permeable corrugated pipes. Because the pipe hole of this product is in the trough and is long, it effectively overcomes the disadvantage that the flat round hole product is easily blocked and affects the drainage effect. According to different drainage requirements, the size of the pipe hole can be 10mm×1mm-30mm×3mm, and can be evenly distributed within the range of 360 degrees, 270 degrees, 180 degrees, 90 degrees, etc. It is widely used in drainage fields such as roads, railway roadbeds, subway projects, waste landfills, tunnels, green belts, sports fields, and slope protection caused by high water content, as well as underground irrigation and drainage systems in agriculture and gardening. It, soft permeable pipes, and plastic blind ditches have become the three major products in my country's civil engineering construction (seepage, drainage). Depending on the drainage pressure, the municipal drainage network can choose double-arm corrugated pipes and straight-wall pipes. Straight-wall pipes have strong pressure bearing capacity and can be used as special pipes for large-scale drainage and sewage pipe networks.

[0003] At present, in the production process of drainage pipes, after the drainage pipes are extruded and cut, they need to be water-cooled, and then the surface needs to be dried. Usually, the efficiency of water cooling of the drainage pipes is not high, and the cooling effect is not sufficient. In addition, the drainage pipes need to be dried after water cooling, which complicates the overall process and increases the equipment cost. At the same time, if the drying is not sufficient, it will affect the subsequent processes. The pipes produced have poor adaptability to temperature changes and terrain fluctuations, and cannot avoid cracks and breakages caused by the rigidity of the materials.

[0004] To this end, we provide a non-pressure polyethylene drainage pipe and a production method thereof. Summary of the invention

[0005] The object of the present invention is to provide a non-pressure polyethylene drainage pipe and a production method thereof to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a non-pressure polyethylene drainage pipe, comprising a core layer, an inner layer is arranged inside the core layer, an outer layer is arranged outside the core layer, the core layer is a polyethylene layer, the inner layer is a low-density polyethylene layer, and the outer layer is a high-density polyethylene layer. The pipe is a non-pressure polyethylene drainage pipe made of high-density polyethylene and low-density polyethylene through extrusion.

[0007] Another technical problem to be solved by the present invention is to provide a method for producing a non-pressure polyethylene drainage pipe, the production method comprising the following steps: Step 1: blending high-density polyethylene and low-density polyethylene raw materials at a ratio of 7:3 at high temperature, heating to 170° C. to melt and form a uniform melt; Step 2: Extruding and drawing the melt through a twin-screw extruder to form a pipe; Step 3: Cool the extruded pipe to 20°C, print the product logo by inkjet printing, and inspect the semi-finished product after cutting. The inspection items include appearance, specifications, dimensions, elongation at break, tensile strength, ring stiffness, etc. Step 4: Products that fail the inspection will be scrapped. Products that pass the inspection will be polished off to become finished products. The finished products are then inspected and put into storage after passing the inspection. Products that fail the inspection will be sent for repair and put into storage after passing the repair. Products that fail the repair will be scrapped.

[0008] Preferably, the melt pressure in step 1 is 0.3 MPa-0.4 MPa.

[0009] Preferably, in the step 2, the pulling line speed and vacuum shaping pressure required for extrusion drawing by a twin-screw extruder are set according to the wall thickness of the pipe, and the temperature is controlled at 170°C-200°C.

[0010] Preferably, the finished non-pressure polyethylene drainage pipe in step three has a specification size of Φ110mm-Φ630mm, and is applicable to non-pressure direct buried pipeline transportation.

[0011] Preferably, the elongation at break of the finished non-pressure polyethylene drainage pipe in step 3 is ≥150%, the tensile strength is <14MPa, and the ring stiffness SN8 is ≥6KN / m 2 、Ring stiffness SN16 ≥ 10KN / m 2 、Ring stiffness SN32≥16KN / m 2 .

[0012] The present invention provides a non-pressure polyethylene drainage pipe and a production method thereof. It has the following beneficial effects: (1) The present invention provides the pipe with good ring stiffness and tensile strength through the design of high-density polyethylene, so that the product can easily withstand external pressure during installation and use, reducing the risk of rupture caused by geological changes or external heavy pressure.

[0013] (2) The present invention endows the pipe with good flexibility and crack resistance through the design of low-density polyethylene, so that the pipe has stronger adaptability when dealing with temperature changes and terrain fluctuations, and effectively avoids the cracks and breakage problems that are easily caused by the rigidity of the traditional drainage pipe.

[0014] (3) The present invention uses high-density polyethylene and low-density polyethylene as raw materials to improve the chemical resistance and impact resistance of the pipe, thereby ensuring the stability and long-term durability of the drainage system. The production process is to mix the materials in a ratio of 7:3, heat to 170°C for melting, extrude and draw them into shape, cool to 20°C, print the product logo with inkjet printer, inspect the semi-finished products after cutting, and scrap the unqualified ones. The qualified ones are polished off the burrs to become finished products, and then inspect the finished products. After passing the inspection, they are put into storage. If the finished products fail the inspection, they are returned for repair. After passing the repair, they are put into storage again. If they fail the repair, they are scrapped. This not only optimizes the production process and improves product quality, but also greatly reduces the repair rate, improves production efficiency, realizes the rational allocation of resources, and reduces waste in the production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of the polyethylene drainage pipe of the present invention; Figure 2 This is a flow chart of the polyethylene drainage pipe production method of the present invention.

[0016] In the figure: 11 core layer, 12 inner layer, 13 outer layer. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention. Example

[0019] A preferred embodiment of the non-pressure polyethylene drainage pipe provided by the present invention is as follows: Figure 1 As shown: a non-pressure polyethylene drainage pipe, including a core layer 11, an inner layer 12 is arranged inside the core layer 11, and an outer layer 13 is arranged outside the core layer 11. The core layer 11 is a polyethylene layer, the inner layer 12 is a low-density polyethylene layer, and the outer layer 13 is a high-density polyethylene layer. The pipe is a non-pressure polyethylene drainage pipe made of high-density polyethylene and low-density polyethylene through extrusion.

[0020] In this embodiment, by arranging a non-pressure-bearing polyethylene drainage pipe, high-density polyethylene and low-density polyethylene are used as raw materials to improve the chemical resistance and impact resistance of the pipe, thereby ensuring the stability and long-term durability of the drainage system. The design of high-density polyethylene gives the pipe good ring stiffness and tensile strength, making it easy for the product to withstand external pressure during installation and use, reducing the risk of rupture due to geological changes or external heavy pressure. The design of low-density polyethylene gives the pipe good flexibility and crack resistance, making the pipe more adaptable when dealing with temperature changes and terrain undulations, effectively avoiding cracks and breakage problems that are easy to occur in traditional drainage pipes due to material rigidity. Example

[0021] See also Figure 2 , and on the basis of Example 1, it is further obtained that: Another technical problem to be solved by the present invention is to provide a production method of non-pressure polyethylene drainage pipe, the production method comprising the following steps: Step 1: blending high-density polyethylene and low-density polyethylene raw materials at a ratio of 7:3 at high temperature, heating to 170° C. to melt and form a uniform melt; Step 2: Extruding and drawing the melt through a twin-screw extruder to form a pipe; Step 3: Cool the extruded pipe to 20°C, print the product logo by inkjet printing, and inspect the semi-finished product after cutting. The inspection items include appearance, specifications, dimensions, elongation at break, tensile strength, ring stiffness, etc. Step 4: Products that fail the inspection will be scrapped. Products that pass the inspection will be polished off to become finished products. The finished products are then inspected and put into storage after passing the inspection. Products that fail the inspection will be sent for repair and put into storage after passing the repair. Products that fail the repair will be scrapped.

[0022] The melt pressure in step 1 is 0.3MPa-0.4MPa.

[0023] In step 2, the pulling line speed and vacuum shaping pressure required for extrusion drawing by a twin-screw extruder are set according to the wall thickness of the pipe, and the temperature is controlled at 170°C-200°C.

[0024] The specifications of the finished non-pressure polyethylene drainage pipe in step three are Φ110mm-Φ630mm, and its application scope is non-pressure direct buried pipeline transportation.

[0025] The elongation at break of the finished non-pressure polyethylene drainage pipe in step 3 is ≥150%, the tensile strength is <14MPa, and the ring stiffness SN8 is ≥6KN / m 2 、Ring stiffness SN16 ≥ 10KN / m 2 、Ring stiffness SN32≥16KN / m 2 .

[0026] In this embodiment, the convenience and economy of the pipe during the construction process are ensured through the production process. At the same time, strict testing standards ensure the stability of product quality, so that the non-pressure polyethylene drainage pipe can show excellent performance and reliability in various geological conditions and environmental changes, and meet different engineering needs.

[0027] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0028] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A non-pressure polyethylene drainage pipe, comprising a core layer (11), characterized in that: An inner layer (12) is arranged inside the core layer (11), and an outer layer (13) is arranged outside the core layer (11); the core layer (11) is a polyethylene layer, the inner layer (12) is a low-density polyethylene layer, and the outer layer (13) is a high-density polyethylene layer. The pipe is a non-pressure-bearing polyethylene drainage pipe formed by extrusion using high-density polyethylene and low-density polyethylene as raw materials.

2. A method for producing non-pressure polyethylene drainage pipes, characterized in that: The production method comprises the following steps: Step 1: blending high-density polyethylene and low-density polyethylene raw materials at a ratio of 7:3 at high temperature, heating to 170° C. to melt and form a uniform melt; Step 2: Extruding and drawing the melt through a twin-screw extruder to form a pipe; Step 3: Cool the extruded pipe to 20°C, print the product logo by inkjet printing, and inspect the semi-finished product after cutting. The inspection items include appearance, specifications, dimensions, elongation at break, tensile strength, ring stiffness, etc. Step 4: Products that fail the inspection will be scrapped. Products that pass the inspection will be polished off to become finished products. The finished products are then inspected and put into storage after passing the inspection. Products that fail the inspection will be sent for repair and put into storage after passing the repair. Products that fail the repair will be scrapped.

3. The method for producing a non-pressure polyethylene drainage pipe according to claim 2, characterized in that: The melt pressure in the step 1 is 0.3MPa-0.4MPa.

4. The method for producing a non-pressure polyethylene drainage pipe according to claim 2, characterized in that: In the step 2, the pulling line speed and vacuum shaping pressure required for extrusion drawing by the twin-screw extruder are set according to the wall thickness of the pipe, and the temperature is controlled at 170°C-200°C.

5. The method for producing a non-pressure polyethylene drainage pipe according to claim 1, characterized in that: The specification size of the finished non-pressure polyethylene drainage pipe in step three is Φ110mm-Φ630mm, and its application scope is non-pressure direct buried pipeline transportation.

6. The method for producing a non-pressure polyethylene drainage pipe according to claim 1, characterized in that: The elongation at break of the finished non-pressure polyethylene drainage pipe in step 3 is ≥150%, the tensile strength is <14MPa, and the ring stiffness SN8 is ≥6KN / m 2 、Ring stiffness SN16 ≥ 10KN / m 2 、Ring stiffness SN32≥16KN / m 2 .

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