The four-roll rubber calender is a key piece of equipment in rubber processing, used for pressing and stretching rubber sheets. The four-roll rubber calender available in our store weighs 10,000 kg, features a twin-screw design with an 85 mm screw diameter and a length-to-diameter ratio of 44:1, and is suitable for raw materials such as PLA and PET. It has an extrusion diameter range of 800-1500 mm and an extrusion output of 500-800 kg/h, meeting high-efficiency production needs. This equipment supports customization; with a 600 mm roller diameter, it can produce single-layer, double-layer, and multi-layer PET sheets with widths ranging from 600 mm to 1220 mm. This four-roll rubber calender is currently in stock to meet your diverse production needs.

PLC-controlled four-roll calenders are the industry standard for high-volume, double-sided rubber coating of cord fabrics (tire cord, conveyor belt fabric) . They achieve precise thickness, uniform cord penetration, and high automation through programmable logic control and advanced roller compensation technologies .

Here is a structured overview covering the core functions, technology, and specifications:

⚙️ How the PLC Integrates the Calendering Process (Fabric Path)
In a typical operation, the PLC orchestrates the entire process :

1. Upper Sheet Formation: Rubber compound is calendered between Roll 1 & 2, forming a thin sheet adhered to Roll 2.

2. Lower Sheet Formation: Simultaneously, another sheet is formed between Roll 4 & 3, adhered to Roll 3.

3. Lamination: The cord fabric (warp threads guided via spindle creel and expander rolls) enters the main nip between Roll 2 & 3. The PLC synchronizes speeds so the two rubber sheets laminate onto both sides of the fabric simultaneously.

4. Post-Processing: The exiting rubberized fabric is pulled via tension-controlled take-off, cooled, and wound.