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"Good plastic material filling system, you need a very special hot runner system, because if you need to molding a durable plastic crate, then you need to use low MFI HDPE, such like MFI=4 or even MFI=6... You need to make the cooling the best optimal effect, for durable milk crate mould, you need to use mold-max on the molding area with excellent cooling water channel design, for one-time use crate, you need to use tempering steel with excellent cooling system designed... You need the high speed injection molding machine to run it, the screw RPM should be bigger then 350. in the world, now most of the crate manufacturers they use an accumulator to increase the melt and injection speed."