End die for extrusion die head of plastic pipe and manufacturing method of end die

A technology for extruding dies and plastic pipes, applied in the field of end dies and their manufacturing, can solve the problems of unsatisfactory finish of plastic pipes, and achieve the effect of improving finish, facilitating production and small friction coefficient

Inactive Publication Date: 2013-04-17
HUBEI DAYANG PLASTIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Despite the long-term efforts of people in the industry and scientific research units at home and abroad for many years, the smoothness of plastic pipes is still unsatisfactory.

Method used

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  • End die for extrusion die head of plastic pipe and manufacturing method of end die
  • End die for extrusion die head of plastic pipe and manufacturing method of end die
  • End die for extrusion die head of plastic pipe and manufacturing method of end die

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The extruded plastic pipe is Φ110mm PP-R water supply pipe, the Teflon coating thickness of the port die and end mandrel is 0.30mm, the length of the port die and end mandrel is 20mm, and the material is pure PTFE Ethylene; the methods used include various spraying methods, such as polytetrafluoroethylene (PTFE) emulsion spraying and sintering film forming process, PTFE resin powder plasma direct spraying film forming process, etc. Since various spraying methods are mature processes and belong to general technologies, they will not be described in detail here. According to this embodiment, the extruded PP-R water supply pipe with a specification of Φ110 mm, according to the national standard GB / T1031-2009, has a surface roughness Ra of less than 0.8 μm.

Embodiment 2

[0036] The extruded plastic pipe is Φ630mm large-scale buried polyethylene (PE) pipe for gas, the Teflon coating thickness of the port die and end mandrel is 0.35mm, and the thickness of the port die connecting table and end mandrel connecting table is The length is 35mm, and the material of its Teflon coating is preferred for this embodiment. The material formula in parts by weight is: 97 parts of pure polytetrafluoroethylene, 0.3 part of leveling agent, 0.30 part of defoamer, lubricating 0.3 part, 0.25 parts of emulsifying agent and 18 parts of water, described polytetrafluoroethylene is all polytetrafluoroethylene emulsions that can be used on metal mould; , the preparation method is as follows:

[0037] (1) According to the Teflon water-based paint composed of the above materials, on the basis of 97 parts of pure polytetrafluoroethylene, defoamers, lubricants, leveling agents, and emulsifiers are successively added, and the defoamers can be divided into two types: joins; ...

Embodiment 3

[0042] The extruded plastic pipe is a Φ25mm plastic rod, and the outer cylindrical surface of the rod has a particularly high requirement for smoothness. The Teflon coating thickness is 0.25mm, the length of the port die is 75mm, the material of its Teflon coating is preferred for the present embodiment, and the material formula by weight parts is: 96 parts of pure polytetrafluoroethylene , 0.13 parts of leveling agent, 0.25 parts of defoamer, 0.3 parts of lubrication, 0.3 parts of emulsifier and 17 parts of water. The preparation method of the material formula is the same as in Example 2. According to this embodiment, the extruded Φ25mm plastic rod can achieve a surface roughness Ra of less than 0.8 μm according to the national standard GB / T1031-2009.

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Abstract

The invention discloses an end die for an extrusion die head of a plastic pipe. The end die comprises an end piece connected with an extrusion end of the extrusion die head, wherein the end piece comprises a connection platform used for connecting an extrusion channel of the extrusion die head, and connection surfaces used for connecting extrusion channel surfaces of the extrusion die head, the connection platform is coated with the connection surfaces, and the connection surfaces are smooth surfaces made of teflon coatings. The invention also provides a manufacturing method of the end die for the extrusion die head of the plastic pipe. The end die comprises the end piece. The manufacturing method of the end piece comprises the following steps: Step 1), the connection platform used for connecting the extrusion channel of the extrusion die head is provided; Step 2), teflon water-based paint containing polytetrafluoroethylene is provided; and Step 3), the connection platform is coated with the teflon water-based paint which is solidified to form the smooth connection surfaces for connecting the extrusion channel surfaces of the extrusion die head. The end die can improve the smoothness of a pipe wall of the extrusion pipe, and the method is simple to operate and facilitates production.

Description

technical field [0001] The invention relates to the field of plastic pipe extrusion dies, in particular to a terminal die used on plastic pipe extrusion dies and a manufacturing method thereof. Background technique [0002] The use of new green and environmentally friendly plastic pipes in industrial and residential buildings has been very extensive in China, such as: water supply pipes, drainage pipes, electrical casings, gas pipes, heating pipes, etc. Various pipes pass through a certain length, commonly used is 4 to 6 meters as a pipe connected with pipe fittings to form a pipe. Among them, the most widely used water supply pipes in the existing market are: PP-R pipes are three-type random copolymerized polypropylene pipes and PE pipes are polyethylene pipes, etc. PP-R pipes are mainly used for home decoration pipes, and PE pipes are also used in a small number For home improvement pipes, mainly used for water supply pipes with large diameters in main roads; drainage pip...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C47/12B29C48/30
Inventor 张慧
Owner HUBEI DAYANG PLASTIC CO LTD
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