Apparatus for producing a multi-layer parison having a layer of varying thickness
US7959426B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 27, 2007 |
| Grant date | Jun 14, 2011 |
| Priority date | — |
| Expiry date | May 25, 2029 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C2949/3006
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An apparatus for producing a parison having a plurality of resin layers and at least one resin layer of varying thickness is disclosed. The parison is used to form containers in a blow mold machine. An extruder is in communication with a flow head to form the parison. The apparatus includes a valve block having a duct providing communication between a second extruder and the flow head. Flow of resin from the second extruder directly to the flow head is controlled by a valve in the valve block. An accumulator cylinder and piston are also in communication with the duct and control the resin pressure within the duct. Opening and closing the valve and stroking the piston sends resin from the second extruder to the flow head and forms a resin layer having a varying thickness on the parison. A method of forming a varying layer is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.