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注道直径一般采用标准设计,但是人们在设计与主注道相连接的较短的分流水口时,往往其厚度设计得不够,使得主流道上的熔体压力不能完全输送到分流水口末端。
The diameter of the sprue is generally of a standard design, but when designing a shorter spigot connected to the main sprue, the thickness is often not designed so that the melt pressure in the main sprue can not be fully delivered to the end of the spigot.