How to choose rotomolding mixing conveying blending system ?

To choose the right rotomolding mixing system, you need to look beyond generic powder blenders. Because rotomolding relies entirely on gravity and thermal conduction inside the mold, your mixing system must produce a highly uniform, free-flowing powder where pigments and additives perfectly adhere to the resin particles without causing them to clump or degrade.

A1: Choose Based on Your Production Capacity

The size and type of your mixing system should match your throughput requirements. Mixing systems are rated by total volume and effective volume (usually 70% of total volume).

Small to Medium Batch Production (Under 300 kg/hr):

A standalone High-Speed Vertical Dry Blender (Turbomixer) is usually sufficient. You can run individual batches, discharge them into storage bins, and let them cool naturally if your cycle times allow.

High-Volume / Continuous Production (Over 500 kg/hr):

You need a Heating/Cooling Mixer Combination Unit (Vertical Hot Mixer + Horizontal Cold Mixer). The hot mixer quickly blends and bonds the additives, while the cold mixer rapidly drops the powder temperature so it can be bagged or molded immediately without caking.


A2: Prioritize Thermal and Temperature Control
The secret to color blending for rotomolding is frictional heating. The mixer needs to heat the powder via mechanical friction up to a precise "sticking point" (usually between 50°C and 65°C depending on the polymer grade). At this temperature, pigments physically stick to the resin grains, preventing color separation during molding.

Dual Temperature Sensors: Ensure the mixing chamber has at least one PT100 temperature probe deeply embedded into the material flow (often through the discharge valve or side wall) for real-time, accurate readings.

Automatic Discharge: Look for a control system that automatically opens the pneumatic discharge valve the exact second the target temperature is reached. Overheating by even a few degrees can cause the resin to agglomerate (clump) and ruin the batch.

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📧 Email: batista@beisu-extrusion.com; maria@beisu-extrusion.com  
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🌐 Website: www.beisumachine.com / www.beisu-extrusion.com
📍 Zhangjiagang BEISU Machinery Co., Ltd. (China Manufacturer)

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