Expandable material with crossed lines, expansion system and method for supplying package material

An expansion system, comprising:

• at least one expandable material, part or all of the at least one expandable material is expandable material with crossed lines, the expandable material with the crossed lines comprises:
• creasing lines, wherein the creasing lines extend along a horizontal direction of the expandable material with the crossed lines and are arranged at intervals in a longitudinal direction of the expandable material with the crossed lines, and the expandable material with the crossed lines is continuous through the creasing lines and folded along the creasing lines to form a saw-toothed stack;
• and
• slits, wherein the slits pass through the expandable material with the crossed lines, extend along a first direction, and are inclined to the creasing lines and arranged at intervals on slit lines defined in the first direction, the slit lines are arranged at intervals in the longitudinal direction of the expandable material with the crossed lines, wherein the creasing lines are crossed with the slit lines to form the crossed lines, and the slits of adjacent slit lines are mutually staggered in the longitudinal direction of the expandable material with the crossed lines;
• and
• an expansion device, comprising a notch for supplying a package material to users, wherein the at least one expandable material passes through the notch, and the notch enables the at least one expandable material to expand to a three-dimensional state from a two-dimensional plane state, so as to form the package material with a single-layer structure or a multi-layer structure.