In addition to the welding equipment and the skill level of the operators, various factors from the inside or outside of the plastic have a certain influence on the welding quality and should be paid attention to.
●Hygroscopicity of Plastic
If welding wet plastic products, the moisture contained in it will turn into steam and escape after being heated, and bubbles will appear on the welding surface, which will weaken the sealing performance of the welding surface. Materials with severe moisture absorption include PA, ABS, PMMA etc.. Products made of these materials must be dried before welding.
●Filler in Plastic
Such as glass fiber, talc power, mica, etc., they change the physical properties of the material.The content of filler in the plastic has a great relationship with the weldability and welding quality of the plastic. Plastics with a filler content of less than 20% can be welded normally without special treatment. When the filler content exceeds 30%, due to insufficient surface plastic ratio and insufficient intermolecular fusion, the sealing performance will be reduced.
●Cleaning of welding surface
The welding surface must be clean and free of impurities to ensure sufficient welding strength and air tightness.
In selecting the correct weldable material, in addition to eliminating the unfavorable factors that affect the welding effect, appropriate welding methods must be adopted according to the type of material, the shape of the product, and the level of cost.
According to the different heating and softening methods used, plastic welding methods can be divided into three types: softening by an external heating source, softening by mechanical movement, and softening by electromagnetic action. We will introduce different welding methods for you later.
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