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Hot melt adhesive is a type of plastic polymer adhesive. Within a certain temperature range, its physical state will change with the temperature. EVA hot melt adhesive is an environmentally friendly chemical product. During use, sometimes hot melt adhesive may be pulled out after melting. What is the reason for drawing hot melt adhesive after melting, which affects work efficiency and product aesthetics? This is mainly caused by the following factors.
1、 Cohesive strength of hot melt adhesive
The basic cohesion and drawing effect of hot melt adhesive are: high cohesion, obvious drawing phenomenon; On the contrary, if the cohesive strength is low, there will be no wire drawing phenomenon.
2、 Curing time of hot melt adhesive
The curing time of hot melt adhesive is very important for the occurrence of wire drawing. Generally speaking, hot melt adhesives with short curing times have a lower chance of drawing because the fine threads formed after curing cannot continue to elongate, making them prone to breakage and sometimes not even drawing out.
3、 Rheological properties of molten hot melt adhesive
The rheological properties of molten hot melt adhesive have a decisive impact on wire drawing, which is related to the design of the hot melt adhesive formula, the selection of materials in the formula, and the composition.
4、 The influence of machine temperature
If the temperature is too low, the thinness of the glue itself will increase, leading to wire drawing phenomenon.
The above are several reasons for the drawing phenomenon of EVA hot melt adhesive. If the above phenomenon occurs during operation, it must be dealt with in a timely manner.
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