Shrinkable tube principle

Date:2016-5-24

Heat shrinkable tube is made of polyolefin material by extrusion molding, crosslinking by electron accelerators, changing the molecular structure available, and make it a memory function, the production of semi-finished expansion of the heat-shrinkable tube is heated to a high elastic state, the use of the vacuum principle to expand it in the case of the use of water to keep expanding rapidly cooled, put it into the glassy state, this state is fixed to live. Heated again to re-Buc-like shape to the memory of high-tech products. There has low shrinkage, soft flame retardant, insulation policyholders, anti-corrosion function.
& Nbsp;
Contraction principle shrinkable sleeve:
Radiation crosslinking
The thermoplastic polymer material in high-energy ionizing radiation (high-energy electron beam, & gamma; - ray) under the action, leading to changes in the molecular structure, a linear combination of the reaction between macromolecular structure into a three-dimensional network structure in a process called radiation crosslinking. Crosslinked polymer material properties after the occurrence of a fundamental change to become insoluble and infusible new materials, and give & ldquo; shape memory & rdquo; new features. In mechanical strength, heat resistance, chemical resistance, solvent resistance, etc. are obtained greatly improved.
Shrink principle
When crystallized polymer materials crosslinked after the post-crosslinking material is heated to above the crystalline melting point, it no longer flows in a rubbery state and become an elastomer. In this state, kept under tensile deformation or expansion is cooled to below the crystallization temperature. Crystallization freeze crosslinked chains stereotypes shape after expansion into a desired shape memory effect, namely the product. When having a thermal expansion after the shape-memory products when reheated to a temperature of crystalline melting point, in the state of stress in the cross-linking chain effect, to restore to its original shape when the irradiation crosslinked, which is shrink or shape memory principle. & Nbsp;
Uses
Thermal materials product structure, type, variety of specifications: tube, tape, film, special parts, widely used in automobiles, home appliances, telecommunications, electric power, petrochemical, military and other fields. An electronic device protection, wire terminal, the branch connection portion, insulating sealing joints, waterproof, anti-corrosion zero devices, fixed and so on.
& Nbsp;
Shrinkage
Shrinkage temperature refers to the lowest temperature begins to shrink when heat shrink tubing. To enable rapid contraction of the pipe is generally recommended to shrink ambient temperature should be higher than the shrinking temperature of 10 ℃ ~ 30 ℃.
& Nbsp;
& Nbsp;
Shrink Toolbar Commonly used tools contraction of industrial drying machine, oven, oven, hair dryer and so on.
1, a & nbsp; gun or guns with automatic safety switch system
& Nbsp; & nbsp; & nbsp; b & nbsp;
blowtorch 2, adapted to prevent burning electric hot hair (gun) and other heating facilities.
& Nbsp;
& Nbsp; shrinkage
& Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; pre-shrinking inner diameter - - When fully retracted the inner diameter
Radial shrinkage (%) = & nbsp; & nbsp; & nbsp; & nbsp; ---------------------------------- ------------ & times; 100%
& Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp;
inner diameter before shrinkage & Nbsp;
& Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; before contraction length - - fully retracted length
Transverse shrinkage (%) = ------------------------------------------- ----- & times; 100%
& Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; before contracted length & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp ; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp;
& Nbsp; & nbsp;
& Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; the thickest wall thickness - - the thinnest wall thickness
Partial wall ratio (%) = & nbsp; ----------------------------------------- ----------- & times; 100%
& Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; the wall thickness of the thickest
& Nbsp;
& Nbsp; Caution
& Nbsp;
1, & nbsp; To ensure waterproofing, sealing, thermal insulation and other products feature in the use of heat shrink tubing, should choose a sufficient length of heat shrink tubing. When heated double heat shrink tubing, hot melt adhesive should be overflow sleeve end better. Selection of heat-shrink tubing sizes should be reasonable and should not be too large or too small.
& Nbsp;
2, & nbsp; when heated shrink tubing should seek uniform. Time not too long, to the fully retracted so far. Avoid local overheating, to prevent material thermal aging, brittle, resulting in casing cracks.
& Nbsp;
& Nbsp; storage, storage, transport
Thermal materials in storage, storage and transportation to avoid direct sunlight. Storage, storage and transportation ambient temperature is generally not more than + 50 ℃, in order to avoid thermal materials natural shrinkage.
& Nbsp;
& Nbsp; color
Color heat shrink tubing: The standard color is black and transparent. Other colors according to customer's request. & Nbsp;
& Nbsp;

TypeInfo: Industry News

Keywords for the information:

Copyright(2016-2020) DONGGUAN KE YU NEW MATERIALS TECHNOLOGY CO.,LTD Add:No.29, Jiefang Road, Xiasha Village, Shipai Town, Dongguan, Guangdong  粤ICP备05066754号  
 
 
  •  
  • top