Title:
HEAT-SHRINKABLE TUBE AND METHOD FOR FORMING SAME
Document Type and Number:
WIPO Patent Application WO/2021/039837
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a heat-shrinkable tube that not only has superior expansion strength and tearability but also ensures a sufficient heat shrinkage rate, the heat-shrinkable tube being superior in both tearability and heat shrinkability and also superior in transparency. The heat-shrinkable tube made of a fluorine resin and having tearability according to the present invention is characterized in that a determination coefficient calculated with [Formula 1] below using an elastic modulus ratio (%) is in the range of 0 to 0.90, exclusive of 0, the elastic modulus ratio (%) being obtained by measuring, on a straight line passing through regions (A), (B), and (C) below, where the thickness of the tube at a cross-section perpendicular to the extrusion direction of the tube is 100%, the elastic moduli of at least three points freely selected from each region, and by calculating, as the elastic modulus ratio (%), the ratio of the average value of the elastic moduli in each region and the average value of the elastic moduli in all the regions. (A) Region of less than 30% from the inside of the tube
(B) Region of 30 to 70% from the inside of the tube, exclusive of 70%
(C) Region of 70% or more from the inside of the tube
In [Formula 1], X, Y, and covariance represent the followings. X: Proportion of the position of each point of elastic modulus measurement from the inside of the tube
Y: Elastic modulus ratio in each region
Covariance: Average of products of deviations of X and Y
Inventors:
NODA MINEYUKI (JP)
YABE HIROMASA (JP)
KIKUCHI HIDEKI (JP)
MIYAMOTO KEI (JP)
SUZUKI KOTA (JP)
YABE HIROMASA (JP)
KIKUCHI HIDEKI (JP)
MIYAMOTO KEI (JP)
SUZUKI KOTA (JP)
Application Number:
PCT/JP2020/032161
Publication Date:
March 04, 2021
Filing Date:
August 26, 2020
Export Citation:
Assignee:
NISSEI ELECTRIC CO LTD (JP)
CHEMOURS MITSUI FLUOROPRODUCTS CO LTD (JP)
CHEMOURS MITSUI FLUOROPRODUCTS CO LTD (JP)
International Classes:
B29C61/02; B29C48/09; B29C48/32; B29C48/885; B29C48/89; C08J5/00
Domestic Patent References:
| WO2008143035A1 | 2008-11-27 | |||
| WO2016204174A1 | 2016-12-22 |
Foreign References:
| JP2017044335A | 2017-03-02 | |||
| JPH0343215A | 1991-02-25 | |||
| JP4968823B2 | 2012-07-04 | |||
| JPS5518268B2 | 1980-05-17 | |||
| JP2014129883A | 2014-07-10 |
Attorney, Agent or Firm:
ONO, Hisazumi et al. (JP)
Download PDF: