Moulding device for moulding a container starting with a parison in plastic material and moulding machine comprising this device
Molding device ( 1 ) for molding a container starting with a parison ( 3 ) in plastic material, comprising: two half-molds ( 4 a, 4 b ), which may be joined to define at least one housing cavity ( 5 ) for the parison ( 3 ); a blowing nozzle ( 6 ) applicable on the neck ( 3 b ) of the parison ( 3 ); a plasma generator ( 8 ) receiving a blowing fluid at a pressure higher than the atmospheric pressure and supplying plasma at a pressure higher than the atmospheric pressure to the blowing nozzle ( 6 ), so that the plasma is blown into the parison ( 3 ) placed in the housing cavity ( 5 ) to mold it and to decontaminate it.
1. Moulding device ( 1 ) of a container ( 2 ) starting with a parison ( 3 ) in plastic material, comprising:
two half-moulds ( 4 a , 4 b ) which may be joined to define at least one housing cavity ( 5 ) of the parison ( 3 );
supply means ( 7 ) of a blowing fluid having a pressure higher than the atmospheric pressure;
a blowing nozzle ( 6 ) applicable on the neck ( 3 b ) of said parison ( 3 ); and
a plasma generator ( 8 ) having an inlet ( 9 ) receiving the blowing fluid from said supply means ( 7 ) and an outlet ( 10 ) enabled to supply plasma at pressure higher than the atmospheric pressure to said blowing nozzle ( 6 ), so that said plasma is blown into the parison ( 3 ) placed in said housing cavity ( 5 ) to mould it at least partially and to decontaminate it;
wherein said supply means ( 7 ) of the fluid comprises:
at least one compression stage ( 16 ) of the fluid enabled to generate said blowing fluid, said at least one compression stage ( 16 ) being placed upstream of the plasma generator ( 8 );
a plasma distribution circuit which receives the plasma from the outlet ( 10 ) of the plasma generator ( 8 ), said distribution circuit including a primary line enabled to transport plasma at a maximum pressure of around 16 bar and a secondary line enabled to transport plasma at a maximum pressure of around 40 bar; and
a valve unit configured to place in selective communication said primary line and said secondary line with the blowing nozzle ( 6 ).
2. Moulding device ( 1 ) according to claim 1 , wherein said at least one compression stage ( 16 ) generates a blowing fluid with a maximum pressure of around 40 bar.
3. Moulding device ( 1 ) according to claim 1 , wherein said plasma generator ( 8 ) is a plasma torch provided with a mobile plug to allow generation of the plasma independently of the pressure value of the blowing fluid at the inlet ( 9 ).
4. Moulding device ( 1 ) according to claim 1 , wherein said at least one compression stage ( 16 ) generates blowing fluid having a maximum pressure of around 8 bar, said moulding device ( 1 ) further comprising one or more compression stages ( 21 , 22 ) of the plasma enabled to compress the plasma coming from said outlet ( 10 ) of the plasma generator ( 8 ) up to a maximum pressure of around 40 bar.
5. Moulding machine of containers ( 2 ) starting from parisons ( 3 ) in plastic material, comprising a plurality of moulding devices ( 1 ) according to claim 1 .