Extrusion head for tubular strands of thermoplastified synthetic resin material
AssigneeReifenhauser GmbH & Co. Maschinenfabrik
InventorsBernhard Reckmann, Wilfried Schwarz, Bernd Schroeter
Life of this patent
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Abstract
A flow-rearrangement device between the annular extrusion gap of an extrusion head and the feed for the thermoplastified synthetic resin has two disks with registering grooves forming rearrangement ducts communicating axial inlet bores with axial outlet bores to effect a flow rearrangement of the thermoplastified synthetic resin which produces microtexturing of the finished product. The extrusion head may be a film or foil blowing head.
Claims14
An extrusion head for extruding a tubular strand of thermoplastified synthetic resin material, comprising:
- a core-forming inner die member;
- an outer die member defining with said inner die member an annular extrusion passage surrounding an axis and through which said thermoplastified synthetic resin flows, said passage having an upstream end and a mouth at a downstream end form which said tubular strand emerges;
- feed means communicating with said upstream ed of said passage for feeding a flow of said thermoplastified synthetic resin to said passage;
- and
- flow-rearrangement means between said fed means and said upstream end of said passage for redistributing the flow of said thermoplastified synthetic resin fed to said upstream end of said passage, said flow-rearrangement means including:
- a multiplicity of inlet bores angularly spaced apart around said axis and connected to said feed means,
- a multiplicity of outlet bores angularly spaced apart around said axis, connected to said upstream end of said passage and angularly offset form the inlet bores about sad axis, and
- rearrangement ducts generally transverse to said bores interconnecting said inlet ores with said outlet bores for delivering said thermoplastified synthetic resin from said inlet bores to said outlet bores, said bores all extending generally in axial directions.
An extrusion head for extruding a tubular strand of thermoplastified synthetic resin material, comprising:
- a core-forming inner die member;
- an outer die member defining with said inner die member an annular extrusion passage surrounding an axis and through which said thermoplastified synthetic resin flows, said passage having an upstream end and a mouth at a downstream end form which said tubular strand emerges;
- feed means communicating with said upstream end of said passage for feeding a flow of said thermoplastified synthetic resin to said passage;
- and
- flow-rearrangement means between said feed means and said upstream end of said passage for redistributing the flow of said thermoplastified synthetic resin fed to said upstream end of said passage, said flow-rearrangement means including:
- a multiplicity of inlet bores angularly spaced apart around said axis and connected to said feed means,
- a multiplicity of outlet bores angularly spaced apart around said axis, connected to said upstream end of said passage and angularly offset from the inlet bores about said axis, and
- rearrangement ducts generally transverse to said bores interconnecting said inlet bores with said outlet bores for delivering said thermoplastified synthetic resin from said inlet bores to said outlet bores, said flow rearrangement means being formed in two superposed annular disks, one of said disks being provided with said inlet bores, the other of said disks being provided with said outlet bores, and each of said disks being formed with a groove registering with a groove of the other disk to form a respective rearrangement duct therewith.
Dependencies are inferred from the claim text.