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Inner core supporting and traction method for extrusion molding of PFA large-diameter thin-walled tube

A technology for extrusion molding and thin-walled pipes, which is applied in the field of extrusion molding of PFA large-diameter thin-walled pipes. Inertia, the effect of smooth running speed

Inactive Publication Date: 2017-01-18
ZHUZHOU HONGDA POLYMER MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the technical problems such as the surface damage of the thin-walled pipe caused by traction and the low product qualification rate in the extrusion molding process of the PFA large-diameter thin-walled pipe in the prior art, the present invention provides a method for extrusion of PFA large-diameter thin-walled pipe. Formed core support traction method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] An inner core support traction method for PFA extruded large-diameter thin-walled pipes, the steps are as follows:

[0027] (1) The inner core is a steel pipe with a flat and smooth surface, and the surface is hard chrome-plated and polished before use. The diameter of the inner core is d<the inner diameter of the PFA thin-walled tube. The inner surface of the thin-walled tube maintains a gap of 1 mm. The traction mechanism adopts a three-claw crawler traction mechanism. The traction crawler adopts a composite V-shaped rubber block with a high friction coefficient.

[0028] (2) The height of the central axis of the production line equipment is kept at the same level, and the traction speed of the crawler traction mechanism is controlled at 0.6m / min.

Embodiment 2

[0030] The inner core support traction method applied in the extrusion molding process of PFA large-diameter thin-walled pipes, the steps are as follows:

[0031] (1) The inner core is a steel pipe with a flat and smooth surface, and the surface is hard chrome-plated and polished before use. The diameter of the inner core is d<the inner diameter of the PFA thin-walled tube. The inner diameter of the thin-walled tube to be prepared is 110mm. The inner surface of the thin-walled tube maintains a gap of 1.2 mm. The traction mechanism adopts a four-claw crawler traction mechanism. The traction crawler adopts a composite V-shaped high friction coefficient rubber block, and the length of the inner core is L ≥ the straight line section of the tractor combined chain running;

[0032] (2) The height of the central axis of the production line equipment is kept at the same horizontal line, and the traction speed of the crawler traction mechanism is controlled as: 0.8m / min.

Embodiment 3

[0034] The inner core support traction method applied in the extrusion molding process of PFA large-diameter thin-walled pipes, the steps are as follows:

[0035] (1) The inner core is a steel pipe with a flat and smooth surface, the diameter of the inner core d<the inner diameter of the PFA thin-walled pipe, the inner diameter of the thin-walled pipe to be prepared is 105mm, and the outer surface of the inner core and the inner surface of the thin-walled pipe maintain a gap of 1.4mm. The mechanism adopts a four-claw crawler-type traction mechanism, and the traction crawler adopts a composite V-shaped high friction coefficient rubber block, and the length of the inner core is L≥the linear section of the combined chain of the tractor;

[0036] (2) The height of the central axis of the production line equipment is kept at the same level, and the traction speed of the crawler traction mechanism is controlled as: 1.0m / min.

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Abstract

The invention specifically relates to an inner core supporting and traction method for extrusion molding of a PFA large-diameter thin-walled tube, belonging to the technical field of high polymer materials. According to the method, (1) an inner core is a steel pipe with a smooth surface, the diameter d of the inner core is less than the internal diameter of the PFA thin-walled tube, a gap of 0.5 to 2.5 mm is maintained between the outer surface of the inner core and the inner surface of the thin-walled tube, a traction mechanism is a crawler type traction mechanism, and the length L of the inner core is no less than the straight-line section of the combined chains of a tractor; and (2) the central axes of production line equipment are maintained at a same horizontal line, and the traction speed of the crawler type traction mechanism is controlled to be 0.2 to 1.2 m / min. The method provided by the invention can efficiently overcome product quality problems in conventional extrusion molding of PFA large-diameter thin-walled tubes.

Description

technical field [0001] The invention relates to the extrusion molding of PFA large-diameter thin-walled pipes among the melt-processable fluoroplastic series materials. Because the pipe wall is thin and soft, it cannot be clamped radially by traction. In order to prevent the surface damage of the pipe caused by traction slipping or creases caused by the folding of the thin-walled pipe due to clamping, when overcoming the key technology of forming, a specific extrusion method is involved. Inner core support traction method for forming PFA large-diameter thin-walled pipe. Background technique [0002] PFA (copolymer of polytetrafluoroethylene and perfluoroalkyl vinyl ether) is a thermoplastic fluoroplastic with good transparency that was researched, developed and produced earlier. It is a kind of compound with a perfluorocarbon structure. The fluorine structure fully possesses the physical properties of polytetrafluoroethylene. Small coefficient of friction, strong anti-adhe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C47/34B29C48/355
CPCB29C48/355
Inventor 朱基贵张鹏何旭辉
Owner ZHUZHOU HONGDA POLYMER MATERIALS
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