Process and apparatus for producing elongated body of elastic modulus changing type
US5258160A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 11, 1992 |
| Grant date | Nov 2, 1993 |
| Priority date | — |
| Expiry date | Aug 11, 2012 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M25/0009
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process and apparatus for producing an elongated body changing in elastic modulus longitudinally thereof with use of polymers without resulting in variations in the outside and inside diameters of the body even when the polymers are different in extrusion characteristics or swelling characteristics. The apparatus may include a feeder 1 for extruding a first polymer in a molten state and a feeder 2 for extruding a second polymer, which is different from the first polymer in elastic modulus and similarly in a molten state. The feeders alternately discharge the respective polymers, which are continuously fed to a long-land die 5 along with a lubricant supplied from a lubricant applicator 4. The polymers are formed into the desired shape and cooled in the die 5, and thereafter extruded.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.