Patent ID: 8641853
Filing Date: 2014-02-04
Classification: B32B,G02C,Y10T

Abstract:
1. A method for transferring a portion of a functional film onto a substrate, the functional film being initially retained on a base plate by an adhering structure comprising: a separating film, a first adhesive layer, which holds the separating film on the base plate, and a second adhesive layer, which holds the functional film on the separating film, said method comprising the following steps: /1/ forming a first groove which passes through a thickness of the functional film around the portion of said functional film, so as to isolate said portion of the functional film from a remaining part of said functional film, /2/ separating the portion of the functional film from the base plate, and /3/ exposing a portion of the second adhesive layer carried by the portion of the functional film, and applying said portion of the second adhesive layer onto the substrate through the portion of functional film in order to affix said portion of the functional film to said substrate, wherein: the first groove additionally passes through a thickness of the separating film so as to isolate, from a remaining part of said separating film, a portion of said separating film that coincides with the portion of the functional film, and a holding of the separating film to the functional film by means of the second adhesive layer is stronger than a holding of said separating film to the base plate by the first adhesive layer, so that the portion of the functional film with the portion of separating film is separated from the base plate in step /2/, said respective portions of the functional film and separating film being held firmly together by the portion of the second adhesive layer, and the portion of the second adhesive layer is exposed at the start of step /3/ by peeling off the portion of separating film, and the method additionally comprising a formation of a second groove between the first groove and a useful part of the portion of the functional film, on at least one side of said portion of functional film, said second groove passing through the thickness of the functional film and possibly at least a part of the second adhesive layer, without passing through the thickness of the separating film, and isolating a margin of the portion of the functional film from said useful part of the portion of the functional film, and the portion of separating film is peeled off at the start of step /3/ by gripping said portion of separating film by the margin of the portion of the functional film outside the useful part of said portion of the functional film, wherein said second groove is formed before said first groove, and an intermediate film is attached to the functional film between the respective formation of the second and first grooves, on one face of said functional film opposite the base plate, said first groove additionally passing through a thickness of the intermediate film so as to isolate, from a remaining part of said intermediate film, a portion of said intermediate film coinciding with the portion of the functional film, and the portion of the functional film being separated from the base plate in step /2/ while solidly attached to the portion of intermediate film.