Public needs for "barrier free" has brought the rapid expansion of the market of Easy Peel Film that is easy to open a lid in the packaging material fields. To meet this market demand, Sumitomo Chemical Co., Ltd has been making an extensive research and succeeded in the development of "Assist~R", the functional film by using its sophisticated resin design technology along with its extrusion processing technology. Sumika Plastech Co., Ltd, subsidiary of Sumitomo Chemical Co., Ltd has been engaging in production and marketing of this "Assist~R" film. Investigation of the fracture mechanism of the materials was the key to success for its product development. In this paper, several examples of product development to meet the client's various needs along with its product performance are addressed.
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