Extrusion Storage Head and Method for Producing Blow-Molded Multilayer Plastic Hollow Bodies
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United States of America Patent
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Issued Date -
Aug 14, 2008
app pub date -
May 5, 2006
filing date -
May 10, 2005
priority date (Note) -
Abandoned
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Abstract
The invention relates to an extrusion storage head (10) for a blow-molding machine and a method for production of blow-molded multi-layer plastic hollow bodies made from a two- or multi-layer pre-form, whereby two or more peripheral manifolds (16, 18) are arranged above a storage reservoir (20), from which the peripherally-extruded plastic may be sequentially ejected as a tubular parison from a controlled annular nozzle (24) by means of an ejector piston (22). According to the invention, an additional peripheral manifold (26) is arranged between the storage chamber (20) and the controlled annular nozzle (24) for application of a further plastic layer (outer functional layer) on the previously peripherally extruded plastic carrier. The additional peripheral manifold (26) is connected through a supply line (28) to an additional external storage element (30) for the molten plastic of the functional layer, wherein the additional external storage element (30) has a separate extruder (32).
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