Hitachi Chemical Company, Ltd.

Kouhei Horiuchi

Michio Uruno

Junichi Imaizumi

Hiroaki Takahashi

Seiji Sunohara

Tomoyuki Nakamura

Yasushi Numaguchi

Mitsuyoshi Shimamura

An adhesive film includes a film-like adhesive layer and a pair of separators sandwiching the adhesive layer. The outer edges of both separators extend outward beyond the outer edge of the adhesive layer, and a blade is used to form a notch on the adhesive layer side of the heavy release separator, along the outer edge of the adhesive layer. The thickness of the heavy release separator is between 50 &#x3bc;m and 200 &#x3bc;m, the average notch depth is between 5 &#x3bc;m and 45 &#x3bc;m and the standard deviation for the notch depth is no greater than 15 &#x3bc;m. Specifying the notch depth allows complete cutting of the adhesive layer with the blade, while also limiting release problems between the heavy release separator and the adhesive layer.

Adhesive film

The adhesive film includes a film-like adhesive layer, a light release separator and a heavy release separator that are laminated on either side of the adhesive layer, and a carrier film further laminated on the heavy release separator. The outer edges of the light release separator and the carrier film forming the outer layer extend outward beyond the outer edge of the adhesive layer and the heavy release separator forming the inner layer. The outer edge sections of the adhesive layer are thereby protected. The outer edge section of the carrier film is gripped and released first, after which the outer edge section of the light release separator is gripped and released, and finally the heavy release separator is released, thereby allowing each separator and the carrier film to be reliably and easily released in the prescribed order.

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Chikusei, Japan

Kouhei Horiuchi