Patent ID: 7186366
Filing Date: 2007-03-06
Classification: B29C,B32B,G09F,Y10S,Y10T

Abstract:
1. In a method for in-mold labeling of synthetic containers to be produced by extrusion blow molding, said method comprising the steps of: a) placing a label in a blow mold tool forming a tool cavity, the label comprising a recyclable label foil with at least three co-extruded layers, wherein two top layers of the label foil are made of polyethylene and each have about the same thickness, and wherein a core layer, located between the top layers, is made of polypropylene and has about 5 times to 20 times the respective thickness of one top layer; b) lowering a hose shaped, softened mold blank through an upper tool opening into the tool cavity; and c) expanding the mold blank by feeding in blow air until the plastic formable wall of the mold blank contacts the wall of the tool where the mold blank solidifies while forming a hollow body; wherein in step (c) the mold blank contacts the label in the location where the label is placed and forms a solid bond with the label by melting top layers of the blank and the label into each other; and wherein the synthetic material of the top layers exhibits a melt flow index MFI (DIN 53735, 190° C./2.16 kg test conditions) of 5 to 30 g/10 min.