The finished product of the heat shrinkable sleeve is well expanded, that is to say, the heat shrinkable sleeve is pre-expanded according to different pipe diameters, and in use, the flame is heated and contracted. Therefore, in the production of heat shrinkable sleeves, expansion is a very important part. The speed of expansion determines the efficiency of production and product quality. When the expansion speed is faster, the production efficiency is improved, but the defect increases when the material is stressed, and the surface is prone to wrinkle; when the expansion speed is slow, the surface of the material becomes hard due to too fast cooling, which increases the expansion load and makes expansion difficult; On the other hand, if the expansion rate is too slow, the establishment of internal stress caused by the expansion force inside the material is correspondingly slow, and the established stress may relax (this relaxation rate is faster under the action of heat), and the orientation decreases. As a result, the material's thermal retraction rate is slow. Therefore, it should generally be expanded at the highest speed possible.

       The control of the expansion speed has always been a difficult point. Now with the development of technology, the expansion speed can be well controlled. This makes the heat shrinkable sleeve also improve the production efficiency, making it the most versatile product for mouth and corrosion protection.

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补口热缩套的扩张速度

     补口热缩套的成品是扩张好的，也就是说根据不同管径，对热缩套进行预扩张，在使用时，再进行火焰加热收缩。因此在热缩套的生产环节中， 扩张是很重要的一个环节。而扩张的速度决定了生产的效率和产品的质量。当扩张速度较快时，生产效率提高了，但材料受力时缺陷增加，表面易起褶皱；扩张速度慢时，材料表面因冷却过快而发硬，使扩张负荷加大，导致扩张困难；另一方面，扩张速度太慢，在材料内部扩张力引发的内应力的建立也相应缓慢，已建立起来的应力可能发生松弛 (在热的作用下，这种松弛速度更快)，取向减少，从而使材料的热回缩速度缓慢。因此一般应尽可能的高速扩张。

      扩张速度的控制一直是个难点，现在随着科技的发展，扩张的速度已经能很好的得到控制了。这使得热缩套也提高了生产效率，使其成为了补口防腐最通用的产品。