PLASTIC BLISTER PROTECTION: HOW DOES IT WORK?
How does the production of plastic blisters work? Starting from the semi-processed material in slabs, thermoforming can be undertaken by means of adhesion to a mould of the semi-processed material that is preheated beyond the glass transition temperature and then cooled.
In this operation, the semi-processed material almost always constitutes the membrane of separation between two environments at different pressures, both positive and negative; the heating can be carried out by hot air or infrared lamp irradiation, the cooling is generally done by air flow.
The actual thermoforming is carried out with different systems: negative mould, positive mould, positive/negative mould, with preliminary blow-moulding, with counter mould.