The packing time, cooling time and packing pressure are the most important factors.
其中保压时间、冷却时间及保压压力是最重要的因子。
The packing time is about 80% of the cooling time which itself is often less than that which is set.
保压时间大约是冷却时间的80%，冷却时间常常小于其设定值。
The results indicate: the effect of packing time at stage I on cell diameter and cell density is greater than that of the packing time at stage II;
结果表明：I阶段保压时间对泡孔直径及泡孔密度的影响大于II 阶段保压时间；
The results indicate: the effect of packing time at stage I on cell diameter and cell density is greater than that of the packing time at stage II;
结果表明：I阶段保压时间对泡孔直径及泡孔密度的影响大于II 阶段保压时间；
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