Typical speeds for drums used for liming will be from 1-1.5 rpm = slow up to 3-4 rpm = fast. Mixers may run from 1-9 rpm while paddles generally have one speed but the action in a paddle is more gentle than either drum or mixer. It should be noted however required to pick up all skins from the bottom of a paddle when restarting and this should be taken into account when short stop start running periods are being used.
The amount of mechanical action required in lime is always a compromise, too much will induce draw or scuff and too little will not ensure distribution of process chemicals. To ensure even distribution even of liquid chemicals throughout a large drum e.g. a 4.25 x 4.25 metre drum with a 12 tonnes load plus 100% float requires a run of at least 30 minutes and may be more depending on drum speed.
Processes
Industries
- Garment
- Upholstery
- Automotive
- Shoe
Main Reaction - The TFL Blog Stories, incidents, tips and facts around the topics leather, chemistry, fashion, sustainability and ecology. Our editorial staff consisting of experienced tanners, scientists, market experts, fashion and communication specialists has sharped their pencils and will supply you with fresh and inspiring content on a regular basis.
LEVOTAN® / LUBRITANTM - Looking for higher performance? Tanners around the world are facing increasing challenges from their customers, for example, demands for higher performance such as fastness to light and heat resistance, but also lighter weight leather and more recently odour / emissions avoidance.
