· · End
break suction system has a variety of functions.
- It removes fibres delivered
by the drafting arrangement after an end break and thus prevents mulitple
end breaks on neighbouring spindles. - It enables better
environmental control, since a large part of the return air-flow of the
aircondition
system is led past the drafting system, especially the region of the spinning triangle. - In modern installations,
approx. 40 to 50 % of the return air-flow passes back into the duct system
of the
airconditioning plant via the suction tubes of pneumafil suction system. - A relatively high vacuum must be generated to ensure suction of waste fibres
- for cotton - around 800 pascals
- for synthetic - around 1200 pascals
- A significant pressure difference arises between the fan and the last spindle. This pressure difference will be greater , the longer the machine and greater the volume of air to be transported. The air flow rate is normally between 5 and 10 cubic meter/ hour.
- Remember that the power needed to generate an air-flow of 10 cubic meter/ hour , is about 4.5 times the power needed for an air-flow of 6 cubic meter/ hour, because of the significantly higher vacuum level developed at the fan.