Located at the top of the trench. Are designed not for the material to flow into the vents during fill. The depth at the position of the exhaust trench usually small to avoid material flowing out. And depending on the viscosity of each kind of plastic, there are different depths. -The width of the Groove without limits, but in practice 2,538 in 12.7 mm ÷. -Track length (l): 0762 mm ≤ l ≤ 3,175 mm
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