The newly developed adhesive bond consists of alkali-resistant, scratchproof polypropylene film - known as Tacklite film - that can be printed in several colors and punched out in any desired format.
“Nordenia Lift-Labels can be used for far more than just the decorative design of beer crates,” says Dr. Roland Parg, Bayer AG, Leverkusen, Germany. It is Parg’s job to develop new ideas for the creative use of this rubber. “They could also be used for large-area advertising stickers like the ones used on cars and buses. With their outstanding, long-lasting adhesion, the possibility of adjusting their adhesive strength to a wide variety of different substrates, their weather stability and their ease of removal from the substrate, these films are ideal for advertising. They attract attention, can be used several times if necessary, and when they are no longer needed, can be removed without leaving behind any traces - except, of course, in the minds of consumers,” Parg adds.
The Nordenia application is not the first in which Levamelt-coated, self-adhesive polyolefin film has made its mark. For some time now, it has been used to protect the windows and paint work of valuable new cars when they are delivered to the auto dealers. Here, too, it was the reliable adhesion and ease of detaching the film afterwards that led to the choice of Levamelt.
Other advantages of Levamelt over conventional adhesives are that ethylene vinyl acetate copolymers with a vinyl acetate content above 55 percent are completely amorphous, which means they do not become brittle, even at low temperatures. Adhesive coatings formulated with this raw material are environmentally friendly, as they contain no solvents, and can be used as hot melt or pressure sensitive adhesives or applied very homogeneously by the co-extrusion process. From layer thicknesses of 5 to 8 µm, they produce permanent tack, sticking immediately and evenly over a long period of time. Levamelt coatings are also transparent and, because of the saturated structure of the vinyl acetate polymer, are oxidation- and UV-resistant, and also insensitive to a number of everyday chemicals. “And being the ‘flexible’ form of conventional EVA copolymers, Levamelt adhesive coatings do not require any plasticizers that might diffuse into the substrate,” explains Dr. Parg.
There is certainly no shortage of new ideas at Nordenia, where the team is already looking into special coatings for digital and heat-transfer printing, inkjet printing, and the home-office segment.
For more information on Lift-Label labels, contact Nordenia International AG, Airport Center am FMO, D -48268 Greven, Germany; phone +49 (0) 2571/91 91 0; fax: +49 (0) 2571/91 91 91; or visit http://www.nordenia.com.