It is fast speed, strong hardness, smooth surface, low cost and high efficient. It can produce two flute type of paperboard, Also, its most ideal equipment for corrugation box plants.
它生产速度快，纸板硬度强，表面平整，成本低，效率高，能先后生产出两种不同楞型的纸板，是瓦楞纸板厂家最理想的产品。
Bone whistles, used as a type of flute, have been found dating back to 5, 000 BC.
用作笛子的骨哨早已出现在公元前5,000年。
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