Glue gun glue 

1 gas pressure is too low, pressure valve should be adjusted, increasing work pressure. 

2 glue gun is not cleaned, adhesive for blocking the passages are, at this time, must be cleared to dredge the channel. 

3 the viscosity of the adhesive is not appropriate, if the viscosity is too large, increased resistance, and the plastic is not continuous or not and the plastic and, therefore, to choose to meet the requirements of the gum.