Calendering is a special process that applied for high-volume, high-capacity plastic film, and sheeting, especially for PVC and for some other modified thermoplastics. Calendering unit is a unit that allows the PVC film to be thinned from the plate mold to the desired thickness and provide smooth of the surface of the film.
Thermoplastic products cannot retain its form when exposed to external factors and may cause changes in size, shape, and color. Therefore, calendering should be done in the last unit.
Edgeband calendering is done by calendering rollers in servo motor control. Rollers are used to thin edgebands. The unit has a hydraulic system to precisely adjust the distance of rollers. It works synchronously with the cutting system used to straighten edges
The calendering process is a process of heat treatment of hot film with a 3-layer cylinder structure, adjusting thickness, and then forming edgeband by cooling. Calendering processes are described following:
The mixture comes to the calendering unit.
The molten polymer is subjected to heat and pressure in an extruder and is converted to layer or film by calendering rollers. The temperature and speed of rollers affect the properties of polymer film.
Hot-shaped PVC mixture is cooled to maintain given form thanks to a balanced cooling system of attractive rollers.
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