Production of oriented plastics by roll-drawing
US5695698A · kind A · utility
Inventors
Key dates
| Filing date | Jan 30, 1996 |
| Grant date | Dec 9, 1997 |
| Priority date | — |
| Expiry date | Jan 30, 2016 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C55/30
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process and apparatus for the continuous solid state forming of semicrystalline polymers using roll-drawing is disclosed. The output of an extruded thick polymer profile is stabilized by a gear pump. The profile is passed through a die for the desired geometry and a cooling calibrator. The profile is heat conditioned in heating tunnels to a temperature below the melting point prior to deformation between sets of rolls. A plurality, e.g. four pairs of rolls apply both compression and tension to the polymer profile. The tension applied on the profile, the roll gap, the linear speed of the profile and its temperature are monitored and controlled for the amount of polymer deformation and relaxation allowed. High tensile modulus and strength, both in the longitudinal and transverse direction of the polymeric strip, can be achieved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.