Process for heat treating moving yarns and apparatus therefor
US5390400A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 12, 1993 |
| Grant date | Feb 21, 1995 |
| Priority date | — |
| Expiry date | Jul 12, 2013 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF28C3/005
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A gentle and fast process for heating yarns passing contactlessly through a heating apparatus. The process includes the steps of preheating a heat transfer has to a temperature above the desired final yarn temperature, feeding the preheated heat transfer gas to the yarn duct so that it impinges essentially perpendicularly on the moving yarn and along a length such that the yarn heats up to the desired elevated temperature within the heating apparatus. The present invention may be used for heating air jet textured yarns and for setting two component loops sewing yarns. The invention further relates to an apparatus for carrying out the process including a preheating means, a duct in the form of a tube drilled with holes, feed lines, and a distributor chamber enabling the heat transfer gas to impinge radially upon the outside of the yarn moving contactlessly in the duct.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.