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Why is the heat shrinkable tube wrinkled after shrinking?

  • Classification:Company News
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  • Release time:2022-06-03
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[Summary]The reason for the heat shrinkable tube itself: it is usually caused by local differences. If the heat shrinkable tube has poor concentricity and uneven thickness, it will cause uneven shrinkage during the heating process, but in this case, proper overheating can basically ensure all complete retract.

Why is the heat shrinkable tube wrinkled after shrinking?

[Summary]The reason for the heat shrinkable tube itself: it is usually caused by local differences. If the heat shrinkable tube has poor concentricity and uneven thickness, it will cause uneven shrinkage during the heating process, but in this case, proper overheating can basically ensure all complete retract.

  • Classification:Company News
  • Author:
  • Source:
  • Release time:2022-06-03
  • Visits:0
详情

We often receive feedback about  the heat shrinkable tube wrinkled after shrinking. During the heating process of the heat shrinkable tube, we often encounter the phenomenon of wrinkles after shrinkage. Or it is the same batch of heat-shrinkable tubes. When heating multiple heat-shrinkable tubes at a time, some are good and some are  wrinkled. So why is the heat shrinkable tube wrinkled after shrinking?

The reason for the heat shrinkable tube itself: it is usually caused by local differences. If the heat shrinkable tube has poor concentricity and uneven thickness, it will cause uneven shrinkage during the heating process, but in this case, proper overheating can basically ensure all complete retract.

The characteristics of the sample wrapped by the heat shrinkable tube: Many single-wall heat shrinkable tubes are used in some metal blocks or sheets, and the metal parts themselves are cold. When the heat shrinkable tube at high temperature is close to the metal, it will be The endothermic effect of the metal rapidly cools down, so that the actual temperature of the heat shrinkable tube is lower than its shrinkage temperature, thus causing partial shrinkage and partial incomplete shrinkage. The usual practice in this case is to choose some heat-shrinkable tubes with inorganic additives to avoid the effect of heat-shrinkable tubes attached to the metal.

Reasons for the selection of heat-shrinkable tubes: The selection of heat-shrinkable tubes should be based on the size of the cables. If the size of the heat-shrinkable sleeve is too small, the shrinkage will not be in place. If the size of the heat-shrinkable sleeve is too large, the size after shrinkage will be larger than the required size, and the effect of sealing will not be achieved.

Abnormal heating equipment: This situation often occurs in some batch processing cases, especially for some terminal heat shrinking machines, heating chambers are used for heating, and multiple samples are installed in one row at a time. Under the same heat-shrinkable tube parameters, some heat-shrinkable tubes are completely retracted, some are overflowing too much, and some are not obvious, and even have not fully retracted. This situation is usually caused by the temperature difference of the heat shrinkable tube heating plate itself, and there is a huge regional temperature difference in the heating area, thus causing uneven shrinkage.

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