Abstract
Laser technology offers many advantages when removing paint (coating) layers from different substrates such as metals, plastics or ceramics. Sensitive carriers with a low melting point like thermoplastic materials can easily be thermally damaged or destroyed using this technology. This paper analyses the quality of the thermoplastic material after removing the thermoset layers from its surface by laser and aims to identify the changes of the most important properties of the polymeric material. The physical-mechanical properties of thermoplastic materials which were coated were investigated before as well as after the removal of the coating layers and compared with parts which were not coated. The focus was on melt flow rate, impact strength, and tensile stress as well as strain. The results show that even a small amount of the paint (coating) can change the behaviour of the thermoplastic material and thus has an impact on further processing. Moreover, it was found that removing the thermoset coating from the thermoplastic material leads to a considerable improvement of its physical-mechanical properties and consequently also extends the possibilities of recycling (reuse) of this polymeric material.
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