Over the Calender: The Evolution of A Little Known but Crucial Part of Paper Mills
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History
In eighteenth century China, workers called "calenderers" in the silk and cotton cloth trades, used heavy rollers to press and finish cloth.
In 1836, Edwin M. Chaffee, of the Roxbury India Rubber Company, patented a four-roll calender to make rubber sheet.[4] Chaffee worked with Charles Goodyear with the intention to "produce a sheet of rubber laminated to a fabric base".[5] Calenders were also used for paper and fabrics long before later applications for thermoplastics. With the expansion of the rubber industry the design of calenders grew as well, so when PVC was introduced the machinery was already capable of processing it into film.[5] As recorded in an overview on the history of the development of calenders, "There was development in both Germany and the United States and probably the first successful calendering of PVC was in 1935 in Germany, where in the previous year the Hermann Berstorff Company of Hannover designed the first calender specifically to process this plastic".[5]
In the past, for paper, sheets were worked on with a polished hammer or pressed between polished metal sheets in a press. With the continuously operating paper machine it became part of the process of rolling the paper (in this case also called web paper).[6] The pressure between the rollers, the "nip pressure", can be reduced by heating the rolls or moistening the paper surface. This helps to keep the bulk and the stiffness of the web paper which is beneficial for its later use.
Modern calenders have "hard" heated rollers made from chilled cast iron or steel, and "soft" rollers coated with polymeric composites. The soft roller is slightly non-cylindrical, tapered in diameter toward both ends, to widen the working nip and distribute the specific pressure on the paper more evenly.
Calendering paper
In a principal paper application, the calender is located at the end of a papermaking process (on-line). Those that are used separately from the process (off-line) are also called supercalenders. The purpose of a calender is to make the paper smooth and glossy for printing and writing, as well as of a consistent thickness for capacitors that use paper as their dielectric membrane.
The calender section of a paper machine consists of a calender and other equipment. The paper web is run between in order to further smooth it out, which also gives it a more uniform thickness. The pressure applied to the web by the rollers determines the finish of the paper, and there are three types of finish that the paper can have.
- The first is Machine Finish, or MF Paper and it can range from a Rough/ Matt (non glossy) look, to a Smooth high quality finish.
- The second is called a Supercalendered Finish, or MG Paper (Machine Glazed) which is Glossy/ Glazed, suitable for a high degree fine-screened halftone printing.**
OTW Editors note: the grades the contributor mentions here also work very well for what's considered more informally and much less specifically "magazine grade papers"
The third type of finish is called a plater finish, and whereas the first two types of finish are accomplished by the calender stack itself, a plater finish is obtained by placing cut sheets of paper between zinc or copper plates that are stacked together, then put under pressure and heating. A special finish such as a linen finish would be achieved by placing a piece of linen between the plate and the sheet of paper, or else an embossed steel roll might be used.
After calendering, the web has a moisture content of about 6% (depending on the furnish). It is wound onto a roll called a tambour, and stored for final cutting and shipping.
Supercalender:
A supercalender is a stack of calenders consisting of alternating steel and fiber-covered rolls through which paper is passed to increase its density, smoothness and gloss. It is similar to a calender except that alternate chilled cast iron and softer rolls are used. The rolls used to supercalender uncoated paper usually consist of cast iron and highly compressed paper, while the rolls used for coated paper are usually cast iron and highly compressed cotton. The finish produced varies according to the raw material used to make the paper and the pressure exerted on it, and ranges from the highest English finish to a highly glazed surface. Supercalendered papers are sometimes used for books containing fine line blocks or halftones because they print well from type and halftones, although for the latter they are not as good as coated paper.
NOTE: PARAGRAPHS ONE AND TWO ARE & WERE ALREADY PRESENT IN THE WIKIPEDIA ARTICLE PRIOR TO THE EXPANSION SECTIONS ADDED / EDITS ACCEPTED DEC. 2017. ALWAYS QUESTION WIKIPEDIA BOTH FOR WHAT'S THERE THAT MAY NOT BE TRUE... AS WELL AS WHAT MIGHT BE MISSING!
