Core board for making paper tubes. Our core board is mainly used to make high strength chemical fiber tubes, yarn bobbins, industrial paper tubes for paper mill and plastic film and etc.The specification of our core board is as following:1. Substance: 230g/m2-600 g/m22.Grade: B,F200,F300,F400,F500,F600,F800,F1000,FB300,FB5003. Reel width: 80mm-2200mm4. Reel diameter: 1000mm-1200mm5. Packing: ...