Cheapest EPDM cold shrink tube tells: What is the caliber and purchase knowledge of cold shrink tubing?
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- Release time:2021-06-11
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[Summary]The inner diameter of cold shrink tubing after contraction is close to the size before expansion, which does not ensure complete retraction. In fact, if the diameter of cold shrink tubing before contraction is D, after extraction, it will quickly shrink to a diameter D'. This diameter D'is generally about 20%-30% larger than the diameter D1 before expansion.
Cheapest EPDM cold shrink tube tells: What is the caliber and purchase knowledge of cold shrink tubing?
[Summary]The inner diameter of cold shrink tubing after contraction is close to the size before expansion, which does not ensure complete retraction. In fact, if the diameter of cold shrink tubing before contraction is D, after extraction, it will quickly shrink to a diameter D'. This diameter D'is generally about 20%-30% larger than the diameter D1 before expansion.
- Classification:Industry News
- Author:
- Source:
- Release time:2021-06-11
- Visits:0
For those who are new to cold shrink tubing products, they will encounter model selection problems. Today, the editor of Cheapest EPDM cold shrink tube will briefly introduce its caliber and purchase knowledge!
1. The inner diameter of cold shrink tubing after contraction is close to the size before expansion, which does not ensure complete retraction. In fact, if the diameter of cold shrink tubing before contraction is D, after extraction, it will quickly shrink to a diameter D ', the diameter D'is generally about 20%-30% larger than the diameter D1 before expansion. Then D'will slowly retract to D1 for a long time. This mechanism is mainly that the shrinkage internal stress in the rubber tube after expansion decreases rapidly as the diameter becomes smaller. When it reaches a certain critical value D', this shrinkage stress Just let the slow contraction speed be negligible. Therefore, we generally need to use D'as a small application inner diameter, instead of using the inner diameter before expansion as the application inner diameter. At the same time, D'is not the actual inner diameter of cold shrink tubing after contraction. This inner diameter changes dynamically and depends on the environment. In the case of natural shrinkage, this inner diameter is between the intervening D1 and D'. It is recommended to be larger than D. ', to leave a margin, so that the cold shrink tubing has enough holding power, so as to have a good installation quality. So before selecting a model, ask the supplier's D'value to know which model should be selected for the smaller shrinkage diameter. In particular, it should be reminded that there are big differences between different materials, different models, and different types of cold shrink tubing products.
2. For the inner diameter D before shrinkage, this determines the larger application inner diameter D'' of cold shrink tubing. The larger inner diameter requires more considerations. The larger outer diameter of the cable to be protected should be considered, and the construction allowance should be considered. Generally, about 20% should be reserved. Of course, this margin can be adjusted according to the actual situation. For example, the construction is not very convenient, and the high-altitude installation requires a large margin, otherwise it is inconvenient to wear the cover. Also, if the margin is not too large, the thickness of the support bar should be considered, ranging from about 1-3mm, you can ask the supplier. Also consider the deviation of the inner diameter after the actual expansion.
The above is the editor of Cheapest EPDM cold shrink tube: about the caliber of cold shrink tubing.
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