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Does the plastic board warp to the hot side?
The plastic plate tilts upward after cooling. At room temperature, the heat transfer of metal block is faster than that of air, that is, the temperature of plastic plate near metal block drops faster than that far away from metal block. Plastics with low temperature have smaller shrinkage and larger size after cooling; Plastics with high temperature shrink greatly and have smaller size after cooling. Therefore, the plastic plate warps upward after cooling.