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Fluororesin tube and process for producing the same

A fluororesin, tube-shaped technology, applied in the direction of tube-shaped articles, other household appliances, applications, etc., can solve problems such as cracking or tearing, and achieve the effect of excellent wall thickness accuracy and low degree of orientation

Inactive Publication Date: 2010-03-24
GUNZE LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In addition, when the fluororesin tube has a high degree of orientation, defects such as cracks or tears tend to occur on its surface during the formation of a roll or belt or actual use

Method used

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  • Fluororesin tube and process for producing the same
  • Fluororesin tube and process for producing the same
  • Fluororesin tube and process for producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] A PFA tube having an outer diameter of 150 mm and an average thickness of 29 μm was produced by melt-extruding PFA having a melting point of 310° C. (MFR = 2.1 g / 10 minutes) through an annular die as described below.

[0078] Two diameter limiting jigs are provided to cool and solidify the tube melt extruded through the annular die and limit the tube diameter to a specific value. In addition, a cylindrical metal protector is provided to enclose the tube in the area where the tube comes into contact with the clamp. see figure 2 .

[0079] First, the inner surface of the extruded tube is placed in contact with a first cooling and diameter limiting jig. Cooling water flows (circulates) inside the fixture. The center of the support rod of the clamp is provided with a tube hole through which air can be introduced. Air at room temperature was introduced through the tube bore to apply internal pressure to prevent the tube from sagging after contact with the inner diameter...

Embodiment 2

[0083] A PFA tube was manufactured in the same manner as in Example 1 except that the outer diameter of the PFA tube was 165 mm and the thickness was 33 μm.

[0084] The average thickness of the resulting tube was 33 μm. The measured tube thickness at each of the 80 points was within ±9.1% of the average thickness of the tube. The degree of orientation (F) of the tube was 0.50.

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Abstract

A large-diameter thin-walled fluororesin tube that even when the diameter is large (for example, 100 mm or greater Phi), exhibits excellent wall thickness accuracy and low orientation; and a process for producing the same. In particular, there is disclosed a fluororesin tube of 70 mum or less average thickness and 100 mm or greater outer diameter wherein the thickness variation of the tube falls within +-20% of the average thickness of the tube and the degree of orientation (F) of the tube is in the range of 0.25 to 0.55.

Description

technical field [0001] The present invention relates to a fluororesin tube, particularly a fluororesin tube used as a surface release layer of a belt for an image forming apparatus using an electrophotographic system such as a copying machine, a printer, and a facsimile machine. [0002] Specifically, the present invention relates to a fluororesin tube usable as a release layer of a tape for electrophotography. Examples of such a peeling layer include a surface layer of a developing sleeve of a developing unit that develops toner onto an electrostatic latent image formed on a photoconductor; for transferring the developed toner image to a recording material Such as the surface layer of an intermediate transfer belt on paper, etc.; the surface layer of a fixing belt for fixing a transferred toner image on a recording material; the surface layer of a transfer-fixing belt for transfer and fixing, etc. Background technique [0003] The fluororesin tube has excellent electrical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C47/20G03G15/14B29K27/12B29L23/00B29C48/10B29C48/32B29C48/90
CPCB29L2023/22G03G15/162B29C47/20B29C47/0004B29C47/903B29C47/902B29K2995/0072B29C47/0023B29C2791/007B29K2027/18B29K2027/12G03G15/1605B29C48/022B29C48/09B29C48/21B29C48/32B29C48/913B29C48/9135B29C48/902B29C48/903B29C48/908Y10T428/139Y10T428/1334Y10T428/1345Y10T428/3154Y10T428/31544B29C48/10B29C48/30
Inventor 黑川正树
Owner GUNZE LTD
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