Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Preparation process of PE (Poly Ethylene) ultra-large-diameter thin-wall pipe material

An ultra-large diameter and preparation technology, which is applied in the field of polyethylene pipes, can solve the problems of uneven ovality of pipe wall thickness, easy collapse of thick-walled pipe blanks, difficult control of outer diameter, etc. Economic benefits and market value, the effect of reliable equipment

Active Publication Date: 2015-07-08
山东华信塑胶股份有限公司
View PDF4 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially for ultra-large-diameter thick-walled pipes, the thick-walled pipe billet is easy to collapse due to its own weight, resulting in uneven wall thickness, difficult heat dissipation, and difficult to control the outer diameter
Therefore, cooling and sizing is very important. It is very difficult to quickly and uniformly cool the HDPE pipe with super large diameter and thick wall. Although the outer surface of the pipe has been cooled and solidified after vacuum cooling and sizing, most of the pipe is still in a molten state. , the melting heat is quickly transferred to the surface of the pipe, and the unsolidified molten inner layer is easy to sag under the weight of the pipe, resulting in uneven wall thickness and large ovality of the pipe
Therefore, it is difficult to prevent the melt from drooping due to gravity when using the cooling water tank spray cooling system alone

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation process of PE (Poly Ethylene) ultra-large-diameter thin-wall pipe material
  • Preparation process of PE (Poly Ethylene) ultra-large-diameter thin-wall pipe material
  • Preparation process of PE (Poly Ethylene) ultra-large-diameter thin-wall pipe material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This embodiment provides a preparation process for polyethylene pipes with a caliber of DN1600×94.11.0 MPa, and the process steps are as follows:

[0029] (1) Ingredients: In parts by weight, take 100 parts of high-density polyethylene and 2 parts of black masterbatch as raw materials, mix high-density polyethylene and black masterbatch evenly, dry at 80-90°C, and dry in this temperature range Keep it for more than 30 minutes. Select high-density polyethylene melt mass flow rate of 0.26-0.4g / 10min, anti-sagging resin.

[0030] (2) Extrusion: transport the mixed material obtained in step (1) from the dry silo to the hopper through the vacuum automatic feeder, put it into the extruder to extrude the pipe, and the head used in the extruder is an improved head ,Such as figure 1 with figure 2 The process parameters of extrusion are as follows: extruder fuselage temperature: 230-190°C, confluence core temperature in the extruder: 230-190°C, head temperature of the extrude...

Embodiment 2

[0036] This embodiment provides a preparation process for polyethylene pipes with a caliber of DN1600×94.11.0 MPa, the process steps are as described in Example 1, the difference is that in step (1), 6 parts of black masterbatch are mixed with 100 parts of high-density polyethylene are mixed evenly, dried at 80-90° C., and kept in this temperature range for more than 60 minutes; in step (2), the speed of the host machine is 100 rpm.

Embodiment 3

[0038] This embodiment provides a preparation process for polyethylene pipes with a caliber of DN1400×82.41.0 MPa, and the process steps are as follows:

[0039] (4) Ingredients: In parts by weight, take 100 parts of high-density polyethylene and 2 parts of black masterbatch as raw materials, mix high-density polyethylene and black masterbatch evenly, dry at 80-90°C, and dry in this temperature range Keep it for more than 30 minutes. Select high-density polyethylene melt mass flow rate of 0.26-0.4g / 10min, anti-sagging resin.

[0040] (5) Extrusion: transport the mixed material obtained in step (1) from the drying silo to the hopper through the vacuum automatic feeder, put it into the extruder to extrude the pipe, and the head used in the extruder is an improved head ,Such as figure 1 with figure 2The process parameters of extrusion are as follows: extruder fuselage temperature: 230-190°C, confluence core temperature in the extruder: 230-190°C, head temperature of the extru...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a preparation process of a PE (Poly Ethylene) ultra-large-diameter thin-wall pipe material. The preparation process adopts an improved machine head of an extruding machine. The improved machine head comprises an opening mold, an opening mold seat, a sizing sleeve, a core mold, a machine head body and a connector which are connected in sequence, wherein the opening mold is arranged in the opening mold seat; the two sides of the machine head body are provided with adjusting screws; the tail end of the machine head body is provided with the connector; the machine head body is internally provided with an air flowing channel; and the air flowing channel extends outwards from the side surface of the tail end of the machine head body and is communicated with the gas discharging pipeline at the outer part. The preparation process has the advantages that internal air cooling is added, and the air flowing direction is opposite to the extruding direction of the pipe material, so that the cooling effect of the pipe material is improved; by the method, the inner part of the pipe material is cooled simultaneously, so that the problems of non-circularity and nonstandard caused by drooping of melt due to reduction of the gravity and delayed and insufficient cooling are prevented; and the heat of the machine head is guaranteed to be taken away as little as possible, the internal temperature of the machine head is uniform, the action is obvious and the effect is remarkable.

Description

technical field [0001] The invention relates to a preparation process of a PE ultra-large-diameter thick-walled pipe, and belongs to the technical field of polyethylene pipes. Background technique [0002] Super-large-diameter thick-walled PE pipes usually refer to solid-walled pipes with an outer diameter (DN) of more than 1000mm. In recent years, the demand for large-diameter PE pressure pipes has continued to rise. Among them, HDPE (High Density Polyethylene, referred to as "HDPE") has good heat resistance and cold resistance, and good chemical stability. , It also has many characteristics such as high rigidity and toughness, good mechanical strength, etc., and is favored by people and widely used. [0003] HDPE is a highly crystalline polymer with a molding shrinkage rate of 1.5%-3%. During the manufacturing process, an extruder is used to melt and plasticize the extrusion. After the molten tube is extruded from the die, it passes through the sizing cylinder and cools. ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): B29C47/90B29C47/92B29C47/12C08L23/06B29C48/90B29C48/30B29C48/92
Inventor 王全标汤毅张占国赵际伟苑广月
Owner 山东华信塑胶股份有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com