Packaging sheet material - comprising ribbed or corrugated cardboard having stretchable paper secured to one face

摘要

The packaging material comprises a stretchable paper sheet (e.g. having a 10% extensibility) secured to either face of a corrugated cardboard sheet or to either face of a cardboard sheet having ribs on one surface. Pref. the cardboard has an extensibility of 5% between the ribs or corrugations and pref. where the paper sheet is secured to the plane face of a ribbed cardboard sheet, the packaging material is stretched to rib the cardboard sheet between the ribs. The material is more flexible allowing it to be rolled and easily handled by processing machines and rendering it more shock absorbant.