Storage head for a blow molding machine
AssigneeMauser-Werke GmbH
InventorsPeter Langos, Manfred Lehmann
Life of this patent
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Abstract
The invention relates to a storage head for a blow moulding machine for discontinuous manufacture of multi-layer co-extruded and blow-moulded hollow bodies made of thermoplastic. To improve the product quality and to increase the throughput, each distributor element is designed as a spiral channel distributor (20) which distributes the individual molten plastic streams uniformly at the periphery. The ejector (14) consists of at least two concentric tubular pieces (42, 44, 46) and the peripherally distributed plastic streams issue from the front face of the ejector (14) and unite to form a single multi-layer flexible plastic tube in the storage space (16) in the storage head housing (10) below the ejector.
Claims11
A storage head for a blow molding machine for the discontinuous production of multiple-layer high-volume plastic hollow bodies, comprising:
- at least two extruders connected to a storage-head housing (10) to feed at least two liquid plastic melts into an annular storage space of a storage head;
- a centrally disposed shaft (12);
- and at least two mutually independent distributor elements, concentrically surrounding the shaft (12) to distribute the plastic melts circumferentially of said shaft and to conduct them into said annular storage space (16) below an ejector piston (14), which is mounted in the storage-head housing (10) by means of one or more setbolts (18) so as to be movable axially, and by means of which a multiple-layer plastic melt which is distributed circumferentially of said shaft and which is stored in the storage space (16) is co-extruded through an annular nozzle gap (28) which is disposed below the storage space (16), wherein the ejector piston (14) consists of at least two tubular pieces (42, 44, 46) which surround one another concentrically, and a separate one of said distributor elements is located on each said tubular piece (42, 44, 46), each said distributor element being defined by a cylinder shaped spiral-channel distributor (20).
Dependencies are inferred from the claim text.