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Double-screw extruder for producing polyolefin pipe and production process thereof

A twin-screw extruder and extruder technology, which is applied in the field of plastic pipe production, can solve the problems of failing to meet the minimum pressure requirements for pipe forming, the life of the pipe cannot meet the needs of use, and the temperature of the raw material melt. Low cost and the effect of increasing die pressure

Inactive Publication Date: 2014-10-15
WUHAN KINGBULL ECONOMIC DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the screw speed is too high, a large amount of shear heat will be generated, which will cause the temperature of the raw material melt to rise, the raw material will undergo thermal and mechanical degradation, and the performance of the pipe will be damaged, and the service life of the pipe cannot meet the use requirements of more than 50 years; another On the one hand, the head pressure of the parallel twin-screw extruder is low, which cannot meet the minimum pressure requirement for pipe forming, so it cannot be shaped into a tube embryo

Method used

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  • Double-screw extruder for producing polyolefin pipe and production process thereof
  • Double-screw extruder for producing polyolefin pipe and production process thereof
  • Double-screw extruder for producing polyolefin pipe and production process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Mixing. Configure materials in the following proportions:

[0024]

[0025] Put the above materials into a high-speed stirrer and mix evenly, the speed of the stirrer is 800r / min, and the stirring time is 10min.

[0026] (2) Add the uniformly mixed materials into the twin-screw extruder of the present invention, the extruder screw diameter is 75 mm, and the screw speed is 350 r / min.

[0027] (3) Pass 20°C water into the cooling channel of the twin-screw mandrel to cool the screw, so as to reduce the temperature of the material and prevent the material from degrading and destroying under the condition of high-speed shearing and heating.

[0028] (4) Use the combination of air cooling and water cooling to precisely control the temperature of the barrel, and keep the temperature of the barrel at 190-220°C;

[0029] (5) Install a filter screen between the extruder head and the pipe die to increase the back pressure of the extruder and promote the melting and plasti...

Embodiment 2

[0034] (1) Mixing. Configure materials in the following proportions:

[0035]

[0036] Put the above materials into a high-speed stirrer and mix evenly, the speed of the stirrer is 800r / min, and the stirring time is 10min.

[0037] (2) Put the uniformly mixed materials above into a parallel twin-screw extruder with a screw diameter of 75mm and a screw speed of 350r / min.

[0038] (3) Pass 23°C water into the cooling channel of the twin-screw mandrel to cool the screw, so as to reduce the temperature of the material and prevent the material from degrading and destroying under the condition of high-speed shearing and heating.

[0039] (4) Use the combination of air cooling and water cooling to precisely control the temperature of the barrel, and keep the temperature of the barrel at 190-220°C;

[0040] (5) Install a filter screen between the extruder head and the pipe die to increase the back pressure of the extruder and promote the melting and plasticization of raw material...

Embodiment 3

[0045] (1) Mixing. Configure materials in the following proportions:

[0046]

[0047] Put the above materials into a high-speed stirrer and mix evenly, the speed of the stirrer is 800r / min, and the stirring time is 10min.

[0048] (2) Put the uniformly mixed materials above into a parallel twin-screw extruder with a screw diameter of 75mm and a screw speed of 350r / min.

[0049] (3) Put 30-40°C oil into the cooling channel of the twin-screw mandrel to cool the screw, so as to reduce the temperature of the material and prevent the material from degrading and destroying under the condition of high-speed shearing and heating.

[0050](4) Use the combination of air cooling and water cooling to precisely control the temperature of the barrel, and keep the temperature of the barrel at 190-220°C;

[0051] (5) Install a filter screen between the extruder head and the pipe die to increase the back pressure of the extruder and promote the melting and plasticization of raw materials...

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Abstract

The invention provides a double-screw extruder for producing a polyolefin pipe. A cooling channel in the axial direction of a double-screw mandrel is arranged in the double-screw mandrel of the extruder; an air hole channel and a water cooling channel are formed in a cylinder of the extruder; the air hole channel is in the axial direction of the cylinder of the extruder; and the water cooling channel is externally connected with a circulating water pipe. The invention further provides a production process for producing the polyolefin pipe by using the double-screw extruder; and the double-screw extruder is used for producing the polyolefin pipe, so that the yield is high, the production steps are simple and continuous, the production efficiency is high, and the cost is low.

Description

technical field [0001] The invention relates to the field of plastic pipe production, in particular to a twin-screw extruder for producing polyolefin pipes and a production process thereof. Background technique [0002] Polyolefin pipes, such as polypropylene pipes, polyethylene pipes, and polybutene pipes, are generally produced by continuous extrusion molding with a single-screw extruder. During the extrusion process, the raw material is heated, melted and plasticized in the extruder, and then stably transported to the head, where it is shaped into a tube embryo, and finally formed into a tube blank with a specified size by the shaping and cooling device under the action of the traction device. tubing. [0003] Due to its high production efficiency, guaranteed extrusion quality, and low energy consumption, single-screw extruders are currently widely used in the field of polyolefin pipe production and manufacturing. However, with the continuous improvement of production r...

Claims

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Application Information

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IPC IPC(8): B29C47/38B29C47/68B29C47/80B29C48/395
CPCB29C48/402B29C48/834
Inventor 陈厚忠
Owner WUHAN KINGBULL ECONOMIC DEV
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