Process for the production of oriented hollow bodies
AssigneeSolvay & Cie
InventorsGuy Hubert, Edmond Michel
Life of this patent
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Abstract
A process for producing molecularly oriented hollow bodies of thermoplastic material presenting an accurately dimensioned orifice collar, by blow molding a preform in a manner to produce the orifice collar in its definitive form and, after thermally conditioning the preform, finally blow molding the desired final hollow body while forming the lower molded part of the neck below the orifice collar. This process permits the production of oriented hollow bodies with which a closure member can form an effective seal, and which can therefore be used for packaging carbonated beverages.
Claims11
In a process for the production of an oriented hollow body of thermoplastic material provided with a neck finish composed of an upper molded part having an axially symmetrical outer surface and presenting an orifice collar and a lower molded part, by initially blow molding a hot tubular parison of thermoplastic material in a preform mold to produce a preform, conveying the preform from the preform mold to a final blow mold, thermally conditioning the resulting preform to a temperature capable of inducing orientation of the thermoplastic material during subsequent stretching, and finally blow molding the preform to produce the desired final hollow body, the improvement wherein said step of initially blow molding is carried out in a manner to give only the orifice collar its definitive form and to produce a false neck located above the orifice collar, said step of conveying is effected in a manner to allow the preform to assume any arbitrary orientation about its longitudinal axis during introduction into the final blow mold, and said step of finally blow molding is carried out in a manner to form the lower molded part of the neck finish below the orifice collar.
Dependencies are inferred from the claim text.