Method for blow molding

Abstract

Abstract AN IMPROVED METHOD FOR FORMING BLOW MOLDED ARTICLES OF ENHANCED PHYSICAL CHARACTERISTICS BY ORIENTING THE MATERIAL DURING THE FORMATION OF THE ARTICLE. A TWO-STAGE BLOWING OPERATION IS PROVIDED WHEREIN A PRE-FORM BLOW MOLD EFFECTS A UNIFORM AND CONTROLLABLT TRANSFER OF HEAT FROM A FREELY EXTRUDED TUBE. THE PRE-FORM IS CONDITIONED, BOTH THERMALLY AND DIMENSIONALLY, WITHIN THE PRE-FORM FOR MOST EFFECTIVE ORIENTATION DURING A SUBSEQUENT FINAL BLOWING OPERATION. MANIPULATIVELY, THE DISCLOSED METHOD PROVIDES A COMPLETELY OVERLAPPED PRE-BLOWING AND FINAL BLOWING OPERATION, AND MORE THAN ONE SET OF PRE-BLOW AND FINAL BLOW MOLDS MAY BE UTILIZED AT A SINGLE EXTRUDER ORIFICE, IF DESIRED. FURTHER, THE DIRECTION AND EXTENT OF MOVEMENT OF THE MOLDS ADAPTS THE METHOD TO PRESENTLY EXISTING BLOW MOLDING MACHINES, WHILE INCREASING THE MACHINE OUTPUT. SUCESSIVELY UTILIZED BLOW TUBES FORM AND REFORM THE OPEN OR BLOWING END OR THE TUBE TO A FINAL CONFIGURATION. IN THE MANUFACTURE OF CONTAINERS, THE TWO SUCCESSIVELY UTILIZED BLOW TUBES FROM AN ACCURATE, DIMENSIONALLY STABLE FINISH FOR A BOTTLW WHILE ALSO SEVERING ANY NECK FLASH FROM THE FINISH.

Inventors

• 👤 A Uhlig

Bibliographic Details