Patent ID: 6089854
Filing Date: 2000-07-18
Classification: B29C,B29K,Y10S

Abstract:
An installation for manufacturing a receptacle from a preform of thermoplastic material, the receptacle being suitable for being subsequently subjected, without significant deformation, to relatively severe temperature conditions encountered during hot-filling or pasteurization processes, the installation including means for manufacturing a receptacle blank having a hot-shrunk body from the preform, and molding means for forming a final receptacle from the blank, the body of the final receptacle having its final shape and dimensions, wherein:said means for manufacturing a receptacle blank being adapted to form a blank whose shrunk body is longer than the body of the final receptacle to be obtained;the molding means comprise a mold matrix having a moveable bottom portion displaceable between a first lower position for preliminary molding in which the matrix defines a mold cavity having the same transverse dimensions as the body of the final receptacle to be obtained, but having longer longitudinal dimensions, and a second higher position for final molding in which the matrix defines a mold cavity having the same dimensions both transversely and longitudinally as the body and bottom zone of the final receptacle to be obtained;low pressure blowing means for blowing the blank disposed in the mold cavity when the moveable bottom portion is in said first position;high pressure blowing means for blowing the receptacle disposed in the mold cavity when the moveable bottom portion is in said second position; andmeans for controlling displacement of the moveable bottom portion from the first position to the second position without exerting perceptible thrust against the bottom of said receptacle having an unmolded bottom zone.