The most common method with the simplest mould. The sheets adhere to the mould using atmospheric pressure. Varius other versions of the process are avaible , using pre-blowing (balloon), negative forming (plug assisted), reverse blow-moulding, etc.
A blowing bell is combined with mould, in order to increase, through the use of compressed air, the adherence of the sheet onto mould. Indispensable for tenacious materials and clearer definition on the surface of the sheet in contact with the mould.
Pre-cutting negative forming (plug assisted) is combined to the base mould in order to obtain areas precise details on the surface of the sheet opposite that facing mould.
The sheet adheres to the mould through the use of an elastic diaphragm which is compressed by a high pressure fluid. Indispensable for extremely tenacious materials.
Two sheets are formed simultaneously on two opposing half-moulds, then welded togheter under high pressure. Cavities can also be created with materials of varying colour and type.
