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Thermoforming Troubleshooting Guide

Click on following links for causes and solutions!

Problems:

» Sheet wrinkling webbing bridging between tools

» Blister, voids, pits, bubbles

» Excessive sheet sag

» Shiny streak spots on formed parts

» Part warpage

» Sheet tears when forming

» Poor definition, detail of forming

» Mark off lines, chill marks

» Surface marking on formed part

» Sheet whitening

» Nipples on tool side of formed part

» Sag variation between blanks

» Excessive shrinkage or part distortion after tool removal

» Excessive wall thinning

» Thin corners in deep draw

» Shrink marks in corners (inside radii of tool)

» Part sticking to tool

» Sheet sticking to plug assist

» Pre-stretch bubble non-uniform

» During service, corners cracking



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