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Expansion of heat shrink tube

2023-04-13
From aerospace and transportation to medical and commercial electronics. Heat shrink tubes can be used as an alternative to insulating connections and sealing wiring harnesses and many other components from harsh environments. The styles of heat shrink tubes are designed to handle specific types of applications. The most common types of heat shrink products include single wall, double wall, heavy duty, heat shrink fabrics, and molded shapes.

Single wall heat shrink tubes come in a variety of diameters and colors to insulate contacts, isolate wiring, and integrate into color schemes for consumer products. Compared to single-walled tubes, heavy-duty heat shrink tubes have thicker walls that provide more protection against impact and physical abuse.

An example of molded shrink material is a boot-like heat shrink tube designed for bulky repairs on insulation wiring. Another typical use of molded shrink materials is to treat branches on wiring harnesses. Heat shrink fabric is a method of increasing wear resistance while maintaining flexibility. Ordinary heat shrink tubes with the same wear resistance will be harder, while heat shrink fabrics retain their mobility.

Other developments in polymer formulations have resulted in heat shrink tubes with low smoke emissions and zero halogen content, which is a requirement for use in mass transit systems. Certain high performance tube formulations have been designed for use at low temperatures. For example, some polymers based on organosilicon and elastomers bend even at temperatures as low as 73°C.

Radiation crosslinking makes the heat shrinkable tube have special properties of heat shrinkable. Manufacturing typically begins by extruding organic polymer material into tubes, which are then exposed to a beam of high-energy electrons, and the resulting crosslinking creates additional bonds in the chain of molecules that make up the polymer. These additional links enhance some of the polymer's properties, such as temperature and solvent resistance. But most importantly, they give the polymer a memory of shape, size and wall thickness.

The extrusion tube is heated and expands to a larger diameter. It is cooled in this expanded state and delivered to the customer. By applying the right amount of heat energy, the pipe will shrink back to its original state. Interestingly, once the tube is shrunk back to its original size, it becomes stable. Even the application of additional heating beyond the shrinkage temperature has no effect on it.

heat shrinkable tube

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