Aerodynamic Continual Weft Brake
Author(s)
K. Adamek & P. Karel
Abstract
This contribution describes the result of a theoretical design for the gentle
aerodynamical braking of linear body (weft yarn) transported by air flow. The
dynamic model for movement of a discrete mass points system is the main part
of the system, the supposed braking force actions result from numerical flow
modelling. Theoretical results of such modelling experiments, applied in
practice, result in the very expressive production increasing in comparison with
the state-of-the-art, together with expressive fabric quality increasing, too.
Keywords: air jet weaving, weft brake, technical cloths, numerical flow
modelling.
1 Description of the solved problem
The air jet weaving is the most productive weaving system, where the weft yarn
is transported through the weaving channel by air flow. The system of jet
weaving was developed by the foregoer of Textile Machines Research Institute
(VUTS) in Liberec – CZ and widespread in the whole world.
In the last time the looms for production of very heavy technical fabrics are
developed and realized in VUTS. A standard heavy fabric, as for instance very
well known denim for blue jeans, is produced from yarns of a length mass of
100 g/km. A heavy technical fabric, as for instance woven wall covering, is
produced from textured glass yarns of a length mass as far as 600 g/km.
The standard problem of air jet weaving is remaining the same – in the initial
phase of each insertion cycle there is necessary to accelerate the inserted weft
yarn. But with increasing machine revolutions and inserted weft yarn mass, too,
the new problem arises when the flying weft yarn should be stopped at the end of
each pick, first of all by the weaving of very heavy materials.
Example: The loom produces heavy technical fabrics in a weaving width of
2,0 m and with a weaving frequency of 9 Hz. The weft insertion takes 50% of
Keywords
air jet weaving, weft brake, technical cloths, numerical flow
modelling.
Related Book
Other papers in this volume
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