Process and device for hydrodynamic drawing of a polymer thread
US5307547A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 25, 1991 |
| Grant date | May 3, 1994 |
| Priority date | — |
| Expiry date | Jul 25, 2011 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD02J1/223
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Threads consisting of one or more filaments are drawn by being pulled through a braking fluid. Threads consisting of a plurality of filaments are formed into a ribbon for the drawing process. Inside the drawing bath, the thread is heated to a temperature corresponding to its second order transition temperature and is braked in such a way that its tension reaches the tension necessary for drawing the filament or the filaments. Through setting and/or controlling the length of the thread path inside the braking fluid, the viscosity of the fluid, additional mechanical braking means and/or the flow characteristics in the bath, the process is made adaptable for different thread materials and different thread speeds and can be optimized for thread quality. The device for carrying out the process has a quasi-closed main chamber through which a braking fluid is circulated. An antechamber with a variable fluid level may be arranged in front of the entrance to the main chamber. The chambers are formed by two parts that can be folded apart to facilitate threading up.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.