Interlayer film separation method

An interlayer film separation method for separating an interlayer film and glass plates interposing the interlayer film therebetween in a laminated glass, the interlayer film separation method comprising:

• crushing the glass plates in the laminated glass into glass pieces with the interlayer film untorn and maintained in an original size;
• immersing, inside a barrel, the interlayer film with the glass pieces in an interlayer film separation solution for separating the interlayer film and the glass pieces, wherein the interlayer film separation solution comprises an alkaline aqueous solution having etching capability for the glass pieces, and includes one selected from the group consisting of a surfactant, an alcohol, and a hydrocarbon-based organic solvent, that reduces surface tension of the interlayer film separation solution;
• and
• imparting an impact to the glass pieces and the interlayer film as an external force by introducing the interlayer film with the glass pieces into the barrel and rotating the barrel.