My film is wrinkling as it passes over the heat shoe and I can eliminate by increasing the tension on the rollers. Any suggestions?
Make sure the mandrels are properly positioned on the top and bottom, (if the top mandrel is placed in the bottom position, then increasing the tension knob will not have any effect on the wrinkling). When the supply roll mandrels are reversed the core grippers point in the wrong direction to hold the rolls of film. Because the cardboard cores are turning on the mandrels, there is no supply roll tension control and the rolls of film are able to slide from side to side in the mandrel. Another possibility for wrinkling may be dirty rollers or dirty heat shoes. Make sure you have enough supply roll tension to take the wrinkles out of the film before it gets past the heat shoes. Make sure the film is threaded properly. The most frequent operator error is threading the film under the bottom stabilizer bar instead of the idler bar. Top Q: The film shrinks as it passes over the heat shoe (known as “necking” in the laminating trade). A: Reduce the heat and/or the supply roll tension. The film
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