How do we operate a silicone rubber mixing machine?

How do I operate a silicone rubber mixing mill?

I. Pre-Operation Preparation

1. Equipment Inspection

- Verify that the power supply, hydraulic system, and cooling water lines of the rubber mixing mill are leak-free, and that the roller surfaces are clean and free of residual rubber (refer to "GB/T 6038-2021 Safety Specifications for Rubber Mixing Mills").

- Verify that the emergency stop button is functioning properly and ensure that the shutdown response time is ≤ 2 seconds.

2. Environment and Protection

- The recommended operating area temperature is 18-30°C and the humidity is ≤ 70% (to prevent moisture absorption and performance degradation of the silicone).

- Operators must wear heat-resistant gloves, goggles, and anti-static clothing. Metal jewelry is prohibited.

II. Operation Procedure

1. Parameter Setting

- Temperature: Adjust the roller temperature based on the type of silicone. Solid silicone is typically 40-60°C, and liquid silicone is 20-40°C (data source: Dow Corning technical manual).

- Roller Gap: Initially set the gap to 3-5mm, and gradually adjust it to 1-2mm during mixing to optimize dispersion.

2. Dosing and Mixing

- Weigh the silicone base rubber and additives according to the recipe (with an error of ≤±0.5%) and slowly add the materials in 2-3 batches to avoid accumulation.

- The mixing time is generally 8-12 minutes. The rubber is considered acceptable when it "covers the roller" (smooth surface and free of particles).

III. Safety and Emergency Response

1. Abnormal Handling

- If the rubber sticks to the roller, stop the machine immediately. Heat it to 80°C to soften it, then clean it. Forcible peeling is strictly prohibited.

- If the equipment overheats (exceeds the set value by 10°C), disconnect the power supply and contact maintenance.

2. Maintenance

- Clean the rollers and rubber guide grooves daily. Check the gearbox lubricant weekly (ISO VG 220 grade, oil level ≥ 80% of the dipstick).

- Calibrate the temperature sensor quarterly, with an error of ±1°C.

IV. Additional Notes

- Energy Consumption Optimization: Mixing power is typically 15-30kW. This can be reduced by adjusting the speed in stages (e.g., low-speed feeding, high-speed mixing).

- Environmental Requirements: Rubber waste must be stored separately, and the recycling rate for silicone scrap should be ≥ 90% (in accordance with "HJ 1063-2019 Rubber Industry Pollution Control Standard").