Vacuum forming of sheet thermoplastic materials are widely used in indoor and outdoor advertising. Vacuum forming is used in the manufacture of promostoek, registration of places of sales, sales equipment, production volume elements of signage, custom products, etc. Method of vacuum forming (positive and negative methods) is based on reaching a temperature at which the thermoplastic polymer becomes state of the softening, viscosity, and the action of atmospheric pressure between the sheet and form while a vacuum (about 100 mm. Hg. Art. or 10 kn / sq.m.) sheet is drawn into the press-matrix acquiring the necessary forms.
This method of vacuum molding differs from other methods of economic and technical profitability. Creating a low specific pressure can reach conventional mechanical pump. The scheme is simple Vacuum Forming Machine 1 – Mold, 2 – a thermoplastic polymer, 3 – heater, 4 – clamping frame 5 – sealed gaskets, 6 – exhaust openings, 7 – a connection to a vacuum pump. There are more than 1000 brands terpolymer, scope which is very extensive, we are confronted with them on almost 'every step': – packaging (food containers, boxes for the cd, Cases) – computers (keyboard keys) – Electric lighting appliances (ceiling) – Medical Products (Syringes) – children's toys and much more. In the advertising field in vacuum forming are primarily used general purpose polystyrene to a thickness of 2mm.
Polystyrene has high strength, low weight, small moisture absorption, has insulating properties. The range of-50C – + 70C. Transparent grades has light transmission of 80-90%. Transfers influence of alcohol alkalis, easily glued dichloroethane. Susceptible to uv – radiation (UV resistant to only some names with special additives), solvents.