Circuit for exhausting air from a parison, system for supplying and exhausting air from a parison and aseptic moulding process using said circuit and said system

摘要

Process of molding a container in a contamination-controlled environment (102) starting from a parison (20) made of plastic material, comprising the steps of: injecting air into the parison (20) at the maximum pressure of 16 bar and subsequently, at the maximum pressure of 40 bar in such a way as to obtain the container; discharging the air from the parison or from the container (20) externally of the contamination-controlled environment (102) until the air pressure inside the container (20) reaches a predetermined value comprised between 0.5 bar and 3 bar; completing the discharge of the air from the container (20) towards the contamination-controlled environment (102).

主权项

1. Apparatus (100) for moulding containers in aseptic conditions starting from parisons made of plastic material, said apparatus (100) comprising:
i) a contamination-controlled environment (102); ii) a mould (10) located in the contamination-controlled environment (102); iii) supply and exhaust system of air for insufflating and evacuating blown air from a parison or a moulded container (20) in a contamination-controlled environment (102), said supply and exhaust system of air in turn comprising:
an exhaust circuit in the contamination-controlled environment (102) of the blown air from a parison or a moulded container (20), said circuit comprising:
a first aseptic valve (2a) configured such as to establish a selective communication between the inside of the parison or the moulded container (20) and an exhaust line (6) external of said contamination-controlled environment (102);a second aseptic valve (2b) configured such as to establish a selective communication between the inside of the parison or the moulded container (20) and the contamination-controlled environment (102);piloting means (3a, 3b) of said first and said second aseptic valve (2a, 2b), configured such that the discharge of the air present in the parison or in the moulded container (20) occurs, respectively, towards said contamination-controlled environment (102) through the second valve (2b) while the air pressure in the parison or in the moulded container (20) is maintained below a predetermined value, and externally of the contamination-controlled environment (102) through the first valve (2a) while the air pressure is maintained above said predetermined value; said predetermined value being comprised between 0.5 bar and 3 bar; said first valve (2a) being normally closed and receiving, during a first exhaust phase, an opening command (C1) from the piloting means (3a) in response to detection of an air pressure in the parison or in the moulded container (20) which is greater than said predetermined value; said second valve (2b) being normally open and receiving a closing command (C2) from the piloting means (3b) in response to detection of an air pressure in the parison or in the moulded container (20) which is above said predetermined value;a fourth aseptic valve (2d) configured such as to establish a selective communication between a supply line of pre-blown air (P1) and the inside of the parison (20);a fifth aseptic valve (2e) configured such as to establish a selective communication between a supply line of blown air (P2) and the inside of the parison (20).