Why don't gray paper designed two sides smooth?

Grey board is a kind of high intensity of gray cardboard, the paper fiber is better, not only long but also very exquisite. Belongs to a kind of folding, high hardness and strength of paper products. Is also a kind of regeneration of waste paper, is a kind of environmentally friendly packaging materials. For grey board, everyone may have such a question, why gray paper smooth side to side is not smooth, if it is not the manufacturer of grey board is don't know the reason. For manufacturers, this problem is very simple, the following will introduce for you. In fact, the reason is very simple, it is grey board is on a layer of paper pulp without pressure light processing. The reason for this is that the grey board is not strict on this point, only requires a inferior smooth processing, as a result, the price is cheaper also, also won't affect the quality problems, can be said to be a more cost-effective grey board, also won't appear off the hair of what, the quality is good also, to a certain extent, also save on costs.
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