In-Mold Labeling
In-mold forming has been known as a process for producing, by integral molding, a molded resin article bearing a bonded label. This process consists of attaching a label to the inner wall of a mold, melting and injection molding a molding resin, e.g., a polyethylene resin or polypropylene resin, into the mold. Known labels for use in such in-mold forming include resin films printed by gravure printing, synthetic papers printed by multicolor offset printing and aluminum labels obtained by laminating high-pressure-process low-density polyethylene, ethylene/vinyl acetate copolymer, or the like to the back side of an aluminum foil and printing the front side of the foil by gravure printing. [Shiina, Kimura and Nishizawa, US Patent 8,021,727 (9/20/2011)
Recent US Patents
9/20/2011
8,021,727
In-mold molding label and molded product using the same
Shiina, Kimura and Nishizawa of the Yupo Corporation, Japan, developed a label for in-mold forming which tenaciously adheres to molded articles regardless of the materials of the molded articles and is usable under a wide range of molded-article molding conditions with an excellent print finish. The invention relates to: a label for in-mold forming, which comprises a resin film comprising a heat-sealable layer and a printing layer, wherein the heat-sealable layer has a rate of surface aperture of 6-30%, the printing layer has a dot skipping of 5% or lower, and the printing layer has a Bekk's surface smoothness of 650-20,000 seconds; and a molded article using the label. (RDC 9/24/2011)