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This article is about a device for smoothing paper. For the method of timekeeping, see calendar. A calender (or kalandar) is also an order of dervishes in Turkey and Persia.

The calender is a series of rolls in a stack, at the end of a papermaking process (on-line) or separate from it (off-line), which is also called supercalender. The purpose of a calender is to smooth out the paper for enabling printing and writing on it, and to increase the gloss on the paper surface. It is understood to be a process of using pressure for embossing a smooth surface on the still rough paper surface. Image File history File links Question_book-3. ... For other uses, see Calendar (disambiguation) A page from the Hindu calendar 1871–1872. ... The word Dervish, especially in European languages, refers to members of Sufi Muslim ascetic religious fraternities, known for their extreme poverty and austerity, similar to mendicant friars. ... The Diamond Sutra of the Chinese Tang Dynasty, the oldest dated printed book in the world, found at Dunhuang, from 868 AD. Papermaking is the process of making paper, a material which is ubiquitous today for writing and packaging. ... For other uses, see Paper (disambiguation). ... For other uses, see Print. ... Write redirects here. ...

The word “calender” itself is a derivation of the word cylindrus, the Latin word for “cylinder”.

Formerly, the 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 a process of rolling the paper web. The nip pressure can be reduced by heating the rolls and/or moistening the paper surface. This helps to keep the bulk and the stiffness of the paper web which is beneficial for its further use. For other uses, see Hammer (disambiguation). ... This article is about metallic materials. ...

Modern calenders have hard and heated rolls made from chilled cast iron or — in a few cases — steel, and rolls with “soft” covers of polymeric composites. Thus the working nip becomes wider and the specific pressure on the paper more even.en:Calendar Cast iron usually refers to grey cast iron, but can mean any of a group of iron-based alloys containing more than 2% carbon (alloys with less carbon are carbon steel by definition). ... For other uses, see Steel (disambiguation). ... A polymer is a generic term used to describe a substantially long molecule. ... For other uses, see Calendar (disambiguation) A page from the Hindu calendar 1871–1872. ...