Cardboard-plastic system for files, ring-binders, etc. - has cardboard blank with coat, sheath or pocket of 3-layer co-extruded plastic pref. joined by HF-welding

摘要

A cardboard blank (I) is provided, with enclosed in or coated with co-extruded unoriented plastic film (strip) on both sides and/or has a plastic film pocket bonded to it, pref. for files.; the film (II) contains a polyolefin, pref. PE and is opt bonded to (I) with a layer of hot melt adhesive or adhesive; the novelty is that (II) consists of at least 3-layer laminated film, comprising upper (A) and lower layer (C) of PE, pref.