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主要符号说明: t-塑料环的冷态温度（℃）; △t-塑料环的工作温度（℃）; △t-塑料环的设计温升（℃）; △t-任意工作温升（℃）; △t松脱-塑料环开始与活塞发生松脱时的温升（℃）; δ-塑料环在复合前冷态下的相对过盈量
The main symbol: t-plastic ring cold temperature (℃); Δt-plastic ring temperature (℃); △ t-plastic ring design temperature rise (℃); △ t- any working temperature ); Δt loose - temperature rise (° C) when the plastic ring begins to loosen with the piston; δ-relative interference in the cold state before plastic ring