What is calendering
What is calendering
Calendering is a processing method for thin sheet products with width and thickness by means of strong shear force between rollers and corresponding processing temperature, so that the viscous fluid material is repeatedly extruded and extended. Plastic and rubber are calendering process, plastic with polyvinyl chloride resin as the main raw material.
Principle: In the rolling molding process, with the help of the shear force produced between the rollers, the material is repeatedly squeezed and cut to increase the plasticity, and it is extended into a thin product on the basis of further plasticization. The extrusion and shearing action of the roller on the plastic changes the macro-structure and molecular form of the material, and plasticizes and extends the plastic under the temperature coordination. The result of the roller is a thinning of the material layer, and the extension increases the width and length of the material layer. In the process of calendering, when the roller squeezes and cuts the material, the roller is also subjected to the reaction force from the material, which is called the separation force that tries to separate the two rollers. Usually the roller can be designed and processed into a slightly waist drum shape, or adjust the axis of the two rollers, so that it crosses a certain Angle (axis cross) or prestress, you can overcome or reduce the harmful effect of the separation force to a certain extent, and improve the uniformity of the thickness of the rolled product. In the calendering process, due to the great shear stress of the thermoplastic, the macromolecules will have a directional effect along the direction of the film, so that the generated film in the physical and mechanical properties of anisotropy, this phenomenon is called the calendering effect. The size of the calendering effect is affected by the calendering temperature, rotational speed, feed thickness and physical properties, etc. The calendering effect can be reduced by heating up or increasing the calendering time.
POTOP is an expert in the production of laboratory calender equipment, we have desktop three-roll calender, small precision three-layer coextrusion calender testing machine, small multi-layer calender production line, single screw extrusion calender test line and other different models. High strength European standard integrated frame, practical and beautiful; Each power roller is driven by servo motor independently, the roller speed control is accurate, and the synchronization performance is good. Hard chrome plated mirror roller with 304 stainless steel core, high surface finish, no rust; Brand PLC touch screen, easy to control, intelligent; Optional waste edge collection device, convenient waste recycling; Constant tension winding device can be selected to improve the film winding quality; The pattern roller/fog roller can be used to achieve different film surface treatment; Humanized structure design, more convenient operation. We are the preferred brand for laboratory testing and large-scale calender processing equipment. We also provide user-friendly after-sales service to protect customers' products.
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