How to produce Heat shrink tube? heat shrink producing process is a little complex but it is ordered.

The heat shrinkable tube manufactured from a thermoplastic material such as polyolefins, fluorine-containing polymer (such as FEP, PTFE or Kynar ®), polyvinyl chloride, chloroprene rubber, silicone elastomer or a fluorine rubber.
There are two methods according to the material used, heat shrinkage may work. If the material contains many monomers, the polymerization of the monomers, the tubes are heated. As the monomer to become bonded together, and therefore occupy less space, which increases the density of the material. Therefore, the amount of shrinkage of the material

Shrinkable can also be extended based. This process involves generating a normal tube, and then heated to just above the crystalline melting point of the polymer and the mechanical stretching tubes (usually by the expanding gas), and finally, it is rapidly cooled. Later, when heated, the tubing to relax and return to its unexpanded size.
The materials are typically crosslinked by using electron beams, of peroxides, or moisture. Such crosslinking may be for the tube member, to maintain its shape, both before and after shrinkage.
Topically, heating the heat-shrinkable tube often has a UV stabilizer added.

heat shrink producing process (medium wall )