Low density paperboard articles

The invention provides a low density cardboard material and related method for the manufacture of insulated containers, this invention is especially suitable for the manufacture of the Cup. Materials include cardboard piece of the cardboard, cardboard pieces, including wood fibre and expansion of micro-sphere, has a relatively low approximately 0.38~0.64g/cm3[6~10 pounds of/3MSF/mils] about 610~889 Mu m[24~35 density, considerable mils] and at least the thickness of approximately 168x10-3kJ/m2[80x10-3 ft-lbf] internal bond strength, the bond strength of preferably at least approximately 210x10-3kJ/m2[100x 10-3 ft-lbs]. For applications such as cups, the material of barrier-coated on one or both side coated, the barrier coating is best to low density polyethylene, used to restrict fluids penetrate into the cardboard piece. The invention of materials can be used in the manufacture of low density cardboard container, in particular the manufacture of glass, the insulation characteristics of pressboard material equivalent to usually high cost materials used to manufacture glass. In addition, the low-density cardboard in Sheffield and smooth surface is 30SU or greater, with conventional glass blank surface smoothness of 160~200SU, which was considered to be required for qualified print quality. However has found that low density cardboard in the soft press has very good printing properties, although its surface is rough, this is the Board to obtain the necessary insulation and other features while an unexpected benefits.