B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
B31D—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER, NOT PROVIDED FOR IN SUBCLASSES B31B OR B31C
B31D3/00—Making articles of cellular structure, e.g. insulating board
B31D3/005—Making cellular structures from corrugated webs or sheets
B31D3/007—Making cellular structures from corrugated webs or sheets by cutting corrugated webs longitudinally into strips, piling these strips and uniting them