Structural ply of a paperboard core, a paperboard core made...

Details Structural ply of a paperboard core, a paperboard core made... Structural ply of a paperboard core, a paperboard core made...

2005-11-08

2005-11-08

Pyon, Harold (Department: 1772)

Stock material or miscellaneous articles

Hollow or container type article

Paper containing

C428S034100, C428S034600, C428S906000

Reexamination Certificate

active

06962736

ABSTRACT:
A structural ply of a spiral paperboard core has an elasticity modulus E in the cross machine direction (CD) higher than 4500 Mpa, and an elasticity modulus E in the machine direction (MD) higher than 7500 MPa (N/mm2). Such paperboard cores may be manufactured by using, either solely or partly, these structural plies, the paperboard for making up such structural plies having been manufactured by press drying. Paperboard based on the press drying method can be manufactured, e.g., with a board machine employing the Condebelt process. The cores may be used as yarn carriers and as tubes for thin films and foils, which may be wound onto and unwound from the cores at a speed of at least about 200 meters/minute.

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