Using the rubbish such as the sawdust and cropper straw make the machine-made charcoal which need no mix any additive because of the sawdust and the cropper plant cell contain the lignin which will intenerate ,liquefy under the propriety temperature, pressing make it adhibit fibrin ,meantime ,the grain cementation tightly, after the cooling it will solidify molding. The bar marker technology, namely, make use of this theory pressing the biomaterial solidify molding
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