Last updated on October 12th, 2023 at 11:29 pm
What are the Different Drafting Systems used in Speed Frame?
The following drafting systems are used in speed frame:
- 4 – over – 4, two zone drafting system.
- Two-zone apron drafting, (4 – over 4), aprons are adjusted on 2nd top and bottom roller, better fibre control and higher drafting can be attained with this drafting system at the speed frame.
- 2 – over – 3 drafting system, this gives effective grip on the fibre, usually suitable for synthetic fibre, less slippage of fibres in this drafting system.
- 4 – over – 4 graduated roller drafting system.
- 3 – over – 3 drafting system.
- Casablancas – 2 – zone system.
- Casablancas U – 3 system.
- Platt special 3 – line drafting system.
- S.K.F PK 400 system.
- Toyodas 3 – over – 3 two zone system.
- Toyodas 4 – over – 4 three zone system.
- Toyodas FL 2 (D type one zone system).
Description of Casablancas two-zone Drafting System
The Casablancas two-zone drafting system is widely used for cotton on speed frame. The back zone draft takes the place between two pairs of roller, after which follows a zone with practically no draft, in which a special condenser is placed to fold the fibre strand upon itself for consolidation prior to finally drafting it once again in the front zone.
The front zone is composed of the casablancas double apron unit followed by a congenital pair of front rollers. The draft in this zone about three times that in the back zone. Between the Casablancas bands and the front pair of rollers there is a second condenser, the “collector” which incorporates the stray fibres into the bulk to prevent the creation of excessive amount of fly. The Casablancas weighing arrangement consists of a saddle assembly, which receives weight through a single hook and lever.