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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. Sometimes, when using hot melt adhesive, there may be wire drawing after melting. Affects work efficiency and product aesthetics. So, what is the reason for drawing after melting hot melt adhesive? 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 crucial for the occurrence of wire drawing. Generally speaking, hot melt adhesives with short curing times have lower drawing rates because the long filaments formed after curing cannot continue to stretch and are prone to breakage, sometimes even unable to be pulled out.
3、 Rheological properties of hot melt adhesive
The rheological properties of 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 wire 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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