文档介绍：Chapter 8 General Finishing
Lecturer: Prof. Dr. Yan kelu
Chapter 8 General Finishing
Introduction
Mechanical Finishing
Stentering
Hot air stenter (hot air jig tenter) (pin clip)
Calendering
Calendering is a purely mechanical process although chemicals may be used to enhance and make durable the results obtained by calendering. Calenders consist of a series of from three to eleven heavy rollers turning against each other. Alternate rolls are made of polished chilled steel, brass, cast iron, etc. and may be solid or with a hollow core and may be covered with cotton, pith, paper, linen or husk.
Rolling calender or swissing
On a simple rolling calender the fabric passes around the bottom roll and through the nip, around the next roll and so on to the last nip. This treatment serves to give a final smoothness to the cloth and make it less porous and open.
Chasing(叠层轧光)
On the chasing calender the cloth passes through the calender in the same manner as in the rolling calender and is then fed back through the rolls a second time so that two layers of fabric pass through the nips at the same time. The finish obtained on a chasing calender is softer but fuller and with less of a sheen than with a rolling calender.
Friction Calendering
In this type of calendering a friction due to a difference in speed of the cloth and the rolls is the most important factor in the finish obtained. In the friction calender the cloth passes through at a slower speed than the third roll which is a polished chilled steel roll. The cloth passes through the calender at the speed of the two lower rolls and the driven polished roll revolves on the cloth at a higher speed and polishes it.
This gives a highly glazed surface and closes the interstices in the goods to give a smooth finish. If the third roll is run hot a high glaze is obtained. If resins are used the glaze produced will be relatively permanent.
Shreinering(电光)
The shrei