Avoid excessive heating of valve.

不要对阀门过度加热。

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Not having an insulated roof area will certaimly increase your annual heating costs due to excessive heat losses.

但没有保温层的屋顶会因为额外热量的流失，而增加每年的供热成本。

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Causes include heating too quickly in the feed zone, melting too slowly in the transition zone, insufficient mixing, and excessive heat loss in the adapters or die.

其原因包括在喂料区加热时间太短和在过渡区熔融太慢、混合不良、在机筒和口模中存在过多的热量损失。

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