8 Common Rubber Calendering Defects

COMMON DEFECTS�&�Their�Causes�In�Calendering8

A Info-Series By Rubber Machinery World - http://rubbermachineryworld.com

Image: A New 3-Roll Calender from Bharaj Machineries

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INNOVATION & SUPPLIERS M MRUBBER Rubber

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» Incorrect crowning of calender rolls

» Excessive wearing of bearings

» Improper operation of roll bending/zero clearance devices

» Roll temperature too high

» H igh feed bank on to the rolls

» Compound Stock warmed up for longer duration

» Insufficient break-down of your compound

» I nadequate temperature control

» I nsufficient compound feed in the banks

» Roll temperature too high

» L arge nip opening

» S tock warm up for long time

» H igh Compound in the nips

» Insufficient nip opening between rolls

» E xcess compound in the nip

» I mproper roll crown

» H igh compound viscosity

» Improper Roll temperature

» I mproper running speed

» L ow compound viscosity

» I mproper warming of the compound

» High viscosity compound

» I mproper warm up, high bank

» N on uniformity of warm up

» L ower roll temperature

» Lower temperature in one of the rolls

» H igh friction ratio

» H igh calendering speed

» U se of anisotropic fillers

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