Patent ID: 7641760
Filing Date: 2010-01-05
Classification: B29C,C09J,H01L,Y10S,Y10T

Abstract:
1. A method of thermal adherend release, wherein a part of adherends adherent to a heat-peelable pressure-sensitive adhesive sheet having a heat-expandable layer containing a foaming agent are selectively released from the pressure-sensitive adhesive sheet by partly heating the heat-peelable pressure-sensitive adhesive sheet, wherein the method comprises a step of previously heating a sticking site of an adherend to be released at a temperature at which the heat-expandable layer of the heat-peelable pressure-sensitive adhesive sheet does not expand using a pre-heater and a subsequent step of heating the sticking site of the adherend in the heat-peelable pressure-sensitive adhesive sheet at a temperature at which the heat-expandable layer expands to thereby selectively releasing the adherend using a heater separate from the pre-heater, wherein the sticking site of the adherend to be released in the heat-peelable pressure-sensitive adhesive sheet is previously heated at a temperature at which the heat-expandable layer of the heat-peelable pressure-sensitive adhesive sheet does not expand by a heating measure capable of not only partially heating the heat-peelable pressure-sensitive adhesive sheet but also heating it corresponding to the shape of the adherend to be released.