Solution: An upper heater, roughly twice the size of the lower heater plate, was added to the chamber to offset the heat losses.

解决方案： 在腔室上部添加一个尺寸约为下部加热器板的两倍加热器，用以补偿流失掉的热量；

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The size of the hole away from the plate edge should be not less than 40 mm, all the hole diameter should be greater than the bolt diameter, heat bilges cold shrink to fit the board.

孔离板材边缘的尺寸应不少于40mm，所有钻孔直径应大于螺栓直径，以适应板的热胀冷缩。

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