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Different types of plastic react differently to being folded. In many cases, it is essential to inspect the process to ensure surface imperfections are not introduced by the folding action.

In order to achieve the required product shape, plastic is sometimes folded. The thickness and elasticity of the plastic determines its response to the folding action. The more a plastic resists folding, the more likely it is that defects are introduced by the action.

Plastic can be folded mechanically; alternatively, many thermoplastics can only be bent when heated. A strip heater or line heater heats the plastic along a straight line, allowing it to be bent by hand.

Folding deliberately deforms the plastic, which may introduce weaknesses or imperfections into the plastic surface. In addition, if the plastic is folded onto its own surface, then existing defects can cause further quality problems. Detecting surface imperfections before and during the process will increase efficiency and protect quality.

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