How Do You Troubleshoot Causes Of Split Plastic Film?

In a plastic extrusion process, split film ruins the entire section. Here is a simple check list to determine the cause of split blown film. The most common cause of unplanned plastic splitting is insufficient cooling. Check your the temperature of your material as it rises; you may need to turn up the blowers or decrease their temperature. Find your frost line, where the film goes from almost liquid to solid. If it is too high, the material may be splitting due to the frost line being too high. Lower your coolers. Check your blow up ratio. If the blow up ratio is too low, the bubble may split. Increase the ratio to solve the problem. Check to see if the split is occurring as the plastic is being rolled. If so, then the nips are too tight. Check for die lines on the extrusion die itself. This can create weak areas in the blown film with a tendency to split. Look for bad welds on the extrusion die. If it forms a groove or extra line on the die, this defect is transferred to the ...  more