380
K. S. Kulkarni and R. Adivarekar
Fig. 42 Weft straightener
2.7.2 Weft Straightener
A fabric experiences lot of longitudinal tension during various stages of wet processing, which results in formation of bows and skews. The corrective action is to
re-align weft yarns. To achieve this, defined degree of lateral tension is applied to the
fabric. This is done by using different techniques. Most commonly used technique
include mechanical weft straighteners and differential tenter chains. Speed of tenter
chains can be varied to re-align weft or it can also be achieved by passing the material
across rollers that can be pivoted around the centre point of the web.
Essential parts of a weft straightener include skew rollers, bow rollers, nose
sensors, electric accuators etc. (Fig. 42).
2.7.3 Tenter Chain and Its Assemblies
The clips used by most of the manufacturers are manufactured in such a way that it
can be replaced easily as many times it gets damaged during production. These are
made of special aluminum alloy which are corrosion and heat resistant (Fig. 43).
K. S. Kulkarni and R. Adivarekar
Fig. 42 Weft straightener
2.7.2 Weft Straightener
A fabric experiences lot of longitudinal tension during various stages of wet processing, which results in formation of bows and skews. The corrective action is to
re-align weft yarns. To achieve this, defined degree of lateral tension is applied to the
fabric. This is done by using different techniques. Most commonly used technique
include mechanical weft straighteners and differential tenter chains. Speed of tenter
chains can be varied to re-align weft or it can also be achieved by passing the material
across rollers that can be pivoted around the centre point of the web.
Essential parts of a weft straightener include skew rollers, bow rollers, nose
sensors, electric accuators etc. (Fig. 42).
2.7.3 Tenter Chain and Its Assemblies
The clips used by most of the manufacturers are manufactured in such a way that it
can be replaced easily as many times it gets damaged during production. These are
made of special aluminum alloy which are corrosion and heat resistant (Fig. 43).