1.Replacing the SL-6825EA with the SL-6819A compressive upper roller bearing sheath is helpful to stabilize the drafting,adapting to the high temperature and high humidity spinning ambience and the problem of the tradtional iron roller rusting has been thoroughly tackled.

2.Big friction coeffcient, balanced and reliable transmission, good synchronism and identity, stable drafting, slippage prevention,reduced finished yarn body CV valve , extended rubber ring service life.

3.Carbon fibre upper roller bearing can completely replace the original SL-6825 in use.Main advantage of this serial bearing is a thorough elimination of the rusting problem with the "middle" roller and bringing the yarn quality upward.

4.The radial play end of these serial upper roller bearings is 0.003-0.012 mm, the axial end play is <=0.060mm,radial runout tolerance is <=0.005mm.

5.The core shaft holding crosspiece and the surface of the big exterior circle are chrome-plated to strengthen the anti-rusting ability, furthermore, to avoid the twining of the waste down because of rusting,effectively stop waste down from entrance to the bearing's rolling lanes. it is more applicable to combine with the pneumatic cradle.