A METHOD AND AN APPARATUS FOR PRODUCING WARP-FREE CORRUGATED CARDBOARD

摘要

The invention relates to an improved method and apparatus for the production of a warp-free corrugated cardboard from a corrugating machine. …In one aspect a method for producing warp-free corrugated cardboard (17) is characterised in that a continuously running web of corrugated cardboard is induced with alternate upward and downward warps by applying moisture alternately to the two liners (13, 16) of said corrugated cardboard for each length corresponding to a first predetermined number of cut cardboard sheets, and subsequently, after said web of corrugated cardboard has been continuously cut into sheets having a predetermined cut length, a second predetermined number of said sheets are successively stacked so that said induced warps may be reformed by the weight of the sheets themselves. Preferably, the second predetermined number should be chosen to be an integral multiple (2 or more multiple) of the first predetermined number. …Another aspect of the invention resides in the apparatus for effecting the method of the invention.