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Calendar rolls can be cleaning during the manufacturing of flexible magnetic media by the use of a supply roll of wiping cloth pressed against the calender roll by a pressure roller.
English (United States)
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Flexible Magnetic Media Processing Device
Calendar rolls can be cleaning during the manufacturing of flexible magnetic
media by the use of a supply roll of wiping cloth pressed against the calender roll
by a pressure roller.
In the production of flexible magnetic media used for flexible magnetic media
products, a process known as calendering immediately follows the substrate
coating and coating drying process. The calendering process consists of passing
the coated media between rolls which are forced together under very high
pressure and heated to an elevated temperature. The type of calender, known
as supercalendering, used in the manufacture of most flexible magnetic media
employs alternating calender rolls of dissimilar materials, one hard and the next
relatively soft. The hard roll is made of steel, plated, and ground and polished as
to a mirror finish. The softer roll is made of thin cotton or paper discs staked on a
mandrel under extreme pressure. The media is calendered with the coated side
against the polished steel roll. The action of the calender rolls on the media as it
passes through the nips is a combination of heating, squeezing, rubbing, and
compressing. The process densifies the coating, forces coating material into any
microscopic holes which might exist, and smooths the coating while imparting a
high gloss to the surface.
The calender apparatus includes a plurality of hard rolls 1 and 2, with each
two having a soft roll 3 between them. The media...