Since the glued heat-shrinkable tube has the function of sealing and waterproofing, bulging often occurs during the heat-shrinking process. To solve the problem, you need to find out where the problem lies, and it can be solved very quickly. There are two common cases of bulging. One is caused by the heat shrink temperature being too high and the heat shrink tube is burned out. The second is caused by bubbles caused by the accumulation of air inside. This situation is mainly caused by two reasons: the heat shrink temperature is too high and the heat shrink tube method is incorrect. Find the cause of the defect and how to heat shrink the glued heat shrink tube without bulging. Just avoid the heat shrink temperature being too high. , just find the correct shrinking method.

    The shrinkage temperature of glued heat shrinkable tubes is 100-125°C. As long as the heat shrinkage is performed within this reasonable temperature range, the bulging caused by the first type can be avoided. The main material of adhesive heat shrink tubing is modified polyolefin, and its maximum operating temperature is 125°C. Exceeding this temperature will destroy the structure of the material, that is, the temperature is too high, damaging its own properties. Therefore, the temperature of heat shrinkage needs to be adjusted to a suitable temperature. It is best to use a heat gun with temperature adjustment.

    The shrinking method of the glued heat shrinkable tube is very particular. Remember not to shrink from the two ends to the middle. Due to the sealing properties of the glued heat shrinkable tube, when shrinking from the two ends to the middle, the air in the middle cannot be discharged and can only be accumulated in the tape. Glue inside the heat shrink tube, resulting in bulging, which is actually air bubbles. How to avoid air accumulation is also very simple. When shrinking, you only need to heat and shrink from one end in sequence, that is, from left to right, from beginning to end, to avoid the generation of bubbles. For the specific shrinking method, please refer to the steps in the picture above.

    The heat shrinking of glued heat shrinkable tubes is nothing more than paying attention to two points, the adjustment of the appropriate heat shrinking temperature and the correct heat shrinking method. As long as you do these two things well, you will be able to heat shrink the adhesive heat shrink tube with ease, ensuring your product is sealed and waterproof.