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What is the optimal double-belt conveyor length for a continuous PU sandwich panel line?
Direct Answer
An optimal double-belt conveyor length ranges between 18 to 24 meters. This length ensures sufficient curing time for the polyurethane foam under a controlled temperature of 40-60°C at speeds of 5-10 m/min. Shorter conveyors limit production speed, while longer ones increase footprint.
Technical Deep-Dive & Solutions
Explain the relationship: Conveyor Length = Curing Time x Production Speed. Detail the heating systems used in Zhongyuan double-belts (crawlers) to keep accurate foam density (40-42 kg/m³).
Key Engineering Guidelines
- Precision Caliber: Ensure gradual bending stages to prevent metal micro-cracking and material stress.
- Premium Tooling: Use vacuum-quenched GCr15 or Cr12MoV die steel for rollers (HRC 58-62) with hard-chrome plating.
- Smart Design: Always calibrate lateral and vertical roll station alignment using a precise central wireline.
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