Extruder screw
US4140400A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 18, 1977 |
| Grant date | Feb 20, 1979 |
| Priority date | — |
| Expiry date | Nov 18, 1997 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C48/03
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An extruder comprising a cylindrical extruder housing and an extruder screw extending inside the housing to define an intake section, a mixer section, and a discharge section, the screw having a basic flight which extends in an uninterrupted helix from the intake section, through a mixer section to the discharge section and the basic flight is of one diameter in the intake and discharge sections so as to be a running fit in the housing but have a diameter in the mixer section less than the one diameter so as to define in use a clearance fit in the housing and, in the mixer section, a flow advancer and diverter between appearances of the basic flight which over at least the greater part of its length is of the one diameter so as also to be a running fit in the housing so that material fed to the mixer section is caused, in the mixer section, to pass over the basic flight.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.