| 摘要 |
PROBLEM TO BE SOLVED: To prevent adhesive from projecting into a hole even if it is deep by providing a thermoplastic layer, fluidizing at the time of hot pressing, between upper and lower stripping films and specifying the breaking elongation and 100% elongation of the stripping film on the side touching a laminate under a specified heating temperature. SOLUTION: The die releasing material F comprises a laminar thermoplastic material C, fluidizing at the heating temperature for integrally bonding a multiplayer printed wiring board, sandwiched between upper and lower stripping films A, B. Breaking elongation of the stripping film A under the heating temperature is set at 600% or above and 100% elongation thereof under same temperature is set at 350 gf/cm width or below. When the hot press operation progresses to fuse an adhesive sheet 13, the thermoplastic material C in the die releasing material F fuses to flow smoothly and quickly toward a hole 14 under pressure. Consequently. the hole side stripping film A can adhere to the inner surface of the hole 14 and the adhesive 13 can be prevented surely from projecting without causing any leakage of the fusible thermoplastic material C. |
