Method of calibrating extruded filaments
US3989779A · kind A · utility
Assignees
Inventor
Key dates
| Filing date | Jul 10, 1975 |
| Grant date | Nov 2, 1976 |
| Priority date | — |
| Expiry date | Jul 10, 1995 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C2948/92952
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An extruder is operated continuously to produce a plastically deformable strand that is pulled through a calibrating die and a cooling by a withdrawal arrangement downstream of the die in the bath. A sensor detects the volume of the strand between the tool and the extruder and controls the withdrawal rate in accordance with the volume of the strand between the tool and the extruder so as to produce an accurately calibrated extrusion. The sensor may engage the strand at the bank formed immediately upstream of the mouth of the calibrating die or may be upstream therefrom and detect the hang or droop of the strand between the die and the extruder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.