The supercalender is the machine which follows the paper coating and paper making processes and functions to give a paper high gloss and a smooth surface.
In the preceding stages of coating and paper machines, a hybrid twin wire machine and high fidelity blade coating machine were developed by which productivity, runnability and quality of product were much improved.
Attempts have been made to improve supercalender operating speed and runnability, even though no fundamental problems have been solved and no basic concepts of design have been changed over the last few decades.
However, from the view point of technical research and development, it can be said we are at the stage that the development procedures and methods have only just been established and we are starting to accumulate technical data and information.
One of the hurdles to be overcome is how to find a quantitative measure for the gloss, since this is really a human sense or feeling and yet is one of the major decisive factors for the quality of the product.
The hardware to control the gloss is there.
To combine this “hardware” and “human sensing” capability, fuzzy theory should be introduced into the design concept.
Following is a review of the supercalender research and development history focusing on how it responded to preceding process improvements for machine speed and productivity.
In order to meet high speed and efficient productivity in the ongoing processes, the supercalender has yet to resolve the following issues :
1. To speed up to the limit where elastic rolls tolerate.
2. To develop a technology for continuous operation.
3. To minimize elastic roll change time.
The auto-crown control roll improved the product quality remarkably.
The soft winding however also resulted in improved quality and more overall efficient productivity since this soft winding permitted technical innovation for the following processes of the finish winder.
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