Method for making vessels for improving the mechanical strength thereof

Abstract

Manufacturing process of a container ( 2 ) in a mold ( 5 ) having a cavity ( 8 ) defining the final shape of the container ( 2 ), from a polymer blank ( 3 ) heated in advance, this process comprising the following operations: introduction of the blank ( 3 ) into the mold ( 5 ) heated to a predetermined temperature, introduction into the blank ( 3 ) of a pressurized explosive gaseous mixture, ignition of the gaseous mixture.

1 . Manufacturing process of a container ( 2 ) in a mold ( 5 ) having a cavity ( 8 ) defining the final shape of the container ( 2 ), from a polymer blank ( 3 ) heated in advance, this process comprising the following operations:
 introduction of the blank ( 3 ) into the mold ( 5 ) heated to a predetermined temperature,   introduction into the blank ( 3 ) of a pressurized explosive gaseous mixture,   ignition of the gaseous mixture.   
     
     
         2 . Process according to  claim 1 , comprising:
 a pre-blowing operation during the course of which the blank ( 3 ) is stretched, while introducing the explosive gaseous mixture into it;   an ignition operation consistent with igniting the explosive gaseous mixture;   a degassing operation during the course of which the inside of the container ( 2 ) is brought to a pressure close to atmospheric pressure.   
     
     
         3 . Process according to  claim 1 , comprising:
 a pre-blowing operation during the course of which the blank ( 3 ) is stretched, while introducing the explosive gaseous mixture into it;   an ignition operation consistent with igniting the explosive gaseous mixture;   a blowing operation consistent with introducing high pressure air into the container ( 2 );   a degassing operation during the course of which the inside of the container ( 2 ) is brought to a pressure close to the atmospheric pressure.   
     
     
         4 . Process according to  claim 2 , comprising, following the ignition operation, a stabilization operation, during which the residual gas deriving from the ignition is maintained in the formed container ( 2 ). 
     
     
         5 . Process according to  claim 2 , comprising, prior to the degassing operation, a sweeping operation during the course of which air is circulated in the container ( 2 ). 
     
     
         6 . Process according to  claim 1 , comprising:
 a pre-blowing operation, during the course of which the blank ( 3 ) is stretched, while introducing the explosive gaseous mixture into it;   a primary ignition operation consistent with igniting the explosive gaseous mixture;   a primary degassing operation during the course of which the inside of the container ( 2 ) is brought to a pressure close to atmospheric pressure,   a secondary pre-blowing operation during the course of which an explosive gaseous mixture is introduced into the container ( 2 );   a secondary ignition operation consistent with igniting the explosive gaseous mixture;   a secondary degassing operation during the course of which the inside of the container ( 2 ) is brought to a pressure close to the atmospheric pressure.   
     
     
         7 . Process according to  claim 6 , comprising, following the secondary ignition operation, a blowing operation consisting of introducing high pressure air into the container ( 2 ). 
     
     
         8 . Process according to  claim 6 , comprising, following each ignition operation, a stabilization operation, during which the residual gas deriving from the ignition is maintained in the formed container ( 2 ). 
     
     
         9 . Process according to  claim 6 , comprising, prior to the degassing operation, a sweeping operation during the course of which air is circulated in the container ( 2 ). 
     
     
         10 . Process according to  claim 1 , comprising:
 a pre-blowing operation, during the course of which the blank ( 3 ) is stretched, while introducing air into it;   a blowing operation consistent with introducing high pressure air into the blank ( 3 );   a primary degassing operation during the course of which the inside of the container ( 2 ) is brought to a pressure close to the atmospheric pressure,   a secondary pre-blowing operation during the course of which an explosive gaseous mixture is introduced into the container ( 2 );   an ignition operation consistent with igniting the explosive gaseous mixture;   a secondary degassing operation during the course of which the inside of the container ( 2 ) is brought to a pressure close to the atmospheric pressure.   
     
     
         11 . Process according to  claim 10 , comprising, following the ignition operation, a stabilization operation, during which the residual gas deriving from the ignition is maintained in the formed container ( 2 ). 
     
     
         12 . Process according to  claim 10 , comprising, prior to the secondary degassing operation, a sweeping operation during the course of which air is circulated in the container ( 2 ). 
     
     
         13 . Process according to  claim 1 , in which the mold ( 5 ) is heated to a temperature greater than or equal to 100° C. 
     
     
         14 . Process according to  claim 1 , in which the mold ( 5 ) is heated to a temperature greater than or equal to about 130° C. 
     
     
         15 . Process according to  claim 1 , in which the mold ( 5 ) is heated to a temperature greater than or equal to about 160° C. 
     
     
         16 . Process according to  claim 1 , in which the explosive gaseous mixture comprises air and hydrogen. 
     
     
         17 . Process according to  claim 16 , in which the volumetric proportion of hydrogen is about 6%. 
     
     
         18 . Process according to  claim 1 , in which the explosive gaseous mixture is introduced into the blank ( 3 ) or the container ( 2 ) at a pressure greater than or equal to 10 bars. 
     
     
         19 . Process according to  claim 3 , in which the pressure of the air introduced into the blank ( 3 ) or the container ( 2 ) at the time of the blowing operation is greater than or equal to 30 bars. 
     
     
         20 . Machine ( 1 ) for the manufacture of containers ( 2 ) from polymer blanks ( 3 ), heated in advance, comprising:
 a mold ( 5 ) having a cavity ( 8 ) defining the final form of the containers ( 2 ),   the means ( 39 ,  40 ,  41 ) of heating the mold ( 5 );   the means ( 18 - 24 , EV 2 ) of injection of a pressurized explosive gaseous mixture into the mold ( 5 ),   the means ( 35 ,  36 ) of ignition of the gaseous mixture.   
     
     
         21 . Machine according to  claim 20 , in which the means ( 35 ,  36 ) of ignition comprise a spark plug ( 36 ). 
     
     
         22 . Machine according to  claim 21 , in which the spark plug ( 36 ) leads to a nozzle ( 16 ), suitable for communicating with the inside of the container ( 2 ) in order to introduce a gaseous mixture into it. 
     
     
         23 . Machine ( 1 ) according to  claim 21 , in which the spark plug ( 36 ) leads into a stretch rod ( 12 ).