Editing Calender (section)

{{Short description|Series of hard pressure rollers that produces a surface effect on fabric, paper, or plastic film}}
{{Distinguish|calendar|colander|Callander}}

[[File:Calender process.png|thumb|Calender process]]
[[File:INTERIEUR, KALANDER - Renkum - 20265137 - RCE.jpg|thumb|Calender at end of [[paper machine]]]]
[[File:Calender.jpg|thumb|Old calender machine]]
[[File:Holyoke, Massachusetts - Paper. American Writing Paper Co. Super-calender - putting on roll, starting operation. - NARA - 518330.jpg|thumb|Threading paper through calender rolls, 1941]]
[[File:Calander - Pressing Machine.JPG|thumb|Calender machine for electrode pressing in lithium-ion battery manufacturing]]

A '''calender''' is a series of hard pressure rollers used to finish or smooth a sheet of material such as [[paper]], [[textile]]s, [[rubber]], or plastics. Calender rolls are also used to form some types of [[plastic film]]s and to apply coatings.<ref>{{cite patent
| number = US5167894A
| title = Apparatus comprising an extruder and a calender for producing sheets and/or foils from plastic or rubber mixtures
| pubdate = 1992
| inventor = Wilfried W. Baumgarten 
| url = https://patents.google.com/patent/US5167894A/en
}}</ref> Some calender rolls are heated or cooled as needed.<ref>{{cite patent 
| number = US4425489A
| title = Electromagnetic heating system for calender rolls or the like 
| pubdate = 1984
| inventor = Pav, Lauscher
| url = https://patents.google.com/patent/US4425489A/en
}}</ref> Calenders are sometimes misspelled ''calendars''.