Introduction to the hottest calendering process

2022-08-09
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Introduction to calendering molding process

calendering molding is one of the main molding methods of thermoplastic, which is mainly completed by calendering machine. The resin (plastic) and various additives are kneaded by kneader, internal mixer and extrusion feeder (or open mill), mixed and plasticized, and the impurities are filtered out, and then processed into films or sheets through the gap between two or more opposite rolling rollers. The gap between the last roll is adjusted to control the thickness of the products, and then the products are stripped from the calender by the lead off roll, and then the sheets are cooled and shaped by the cooling roll. PVC, PE, ABS, PVA, etc. are commonly used in calendering, and PVC is the most common

calendering process:

1. Ingredients. Weigh the resin and various additives accurately according to the formula proportion

2. Kneading. Add each component of the ingredients into the kneader in the predetermined order for full mixing to ensure that each component is evenly dispersed and soaked

3. Plasticization. Use internal mixer, high-speed kneader or extruder to achieve comprehensive, harmonious and sustainable development. Heat the mixture to the viscous flow temperature, and use the strong shear of plasticizing machinery as a fence rope to fully shear, mix, soak and melt the components among each other, so as to achieve uniform mixing of raw materials, uniform temperature and space, and uniform viscosity

4. Feeding. The plasticized material can be supplied to the calender by a roller press or an extruder through a transfer device. At the same time, it has further plasticizing effect

5. Calendering. Use the calender to press the plastic into a predetermined size of film or sheet within the preset temperature √ speed

6. Lead away. The film or sheet is separated from the calendering roll by the action of the withdrawal roll. Press the "brake" button

7, emboss. Embossing roller and rubber roller work together to get a certain pattern on the surface of the product

8. Cooling. After the film or sheet is formed, it passes through several groups of cooling rollers to cool down and set

9. Transportation. The finalized products are transported to the next process in a loose state through the conveyor belt

10, coiling and cutting. We will assign technicians free of charge to debug and install the roll for you for storage and transportation

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