Blending
can be carried out at various process stages, using various methods, equipment,
machines and intermediate products.
Bale Mixing:
It can be used for both natural and synthetics at the start of spinning process. 6 to 60 bales are laid out for simultaneous flock extraction. The blend produced is often unsatisfactory in the longitudinal direction owing to uncontrolled extraction of flocks and danger to de-blending.
Flock Blending:
At each blowroom machine small degree of mixing is done.
Lap Blending:
A double scutcher is required in this blending. 4 to 6 laps through conveyer lattice are in feed. The blend produced is having very good longitudinal and traverse blends.
Web blending:
Ribbon lap machine was used for this blending. Now drawframe is used which enables controlled blending by bringing together components in web form
instead of in sliver form. This gives a good longitudinal blend and also a better traverse blend than is obtained with sliver blending.
Sliver Blending:
Carried out on drawframe and it provides best blend in longitudinal direction.
Fibre Blending:
The most intimate blend is obtained if individual fibres are brought together. This can be achieved only on cotton card, woollen card and rotor spinning.
Roving Blending:
No longer used in staple spinning mills. Two roving of different are feed in to drafting arrangement of the ring spinning machine. Since the fibre do not blend with drafting but the yarn is twisted either the one or other component
The process of blending involves mixing of exact proportion of each constituent fibre
The following conditions should be fulfilled to ensure satisfactory quality of blend yarn.
1. The constituent fibres are randomly distributed in the yarn cross-section.
2. The ratio of blend fibres in each cross-section of the yarn should not vary by more than dictated by random variation in number of constituent fibres.
3. There should be no undue long, medium or short-term irregularity in blend ratio.
Generally the blending is done at blowroom or at draw frame depending on the constituent fibres.
Bale Mixing:
It can be used for both natural and synthetics at the start of spinning process. 6 to 60 bales are laid out for simultaneous flock extraction. The blend produced is often unsatisfactory in the longitudinal direction owing to uncontrolled extraction of flocks and danger to de-blending.
Flock Blending:
At each blowroom machine small degree of mixing is done.
Lap Blending:
A double scutcher is required in this blending. 4 to 6 laps through conveyer lattice are in feed. The blend produced is having very good longitudinal and traverse blends.
Web blending:
Ribbon lap machine was used for this blending. Now drawframe is used which enables controlled blending by bringing together components in web form
instead of in sliver form. This gives a good longitudinal blend and also a better traverse blend than is obtained with sliver blending.
Sliver Blending:
Carried out on drawframe and it provides best blend in longitudinal direction.
Fibre Blending:
The most intimate blend is obtained if individual fibres are brought together. This can be achieved only on cotton card, woollen card and rotor spinning.
Roving Blending:
No longer used in staple spinning mills. Two roving of different are feed in to drafting arrangement of the ring spinning machine. Since the fibre do not blend with drafting but the yarn is twisted either the one or other component
The process of blending involves mixing of exact proportion of each constituent fibre
The following conditions should be fulfilled to ensure satisfactory quality of blend yarn.
1. The constituent fibres are randomly distributed in the yarn cross-section.
2. The ratio of blend fibres in each cross-section of the yarn should not vary by more than dictated by random variation in number of constituent fibres.
3. There should be no undue long, medium or short-term irregularity in blend ratio.
Generally the blending is done at blowroom or at draw frame depending on the constituent fibres.
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