| 摘要 |
PROBLEM TO BE SOLVED: To provide a multilayered synthetic film enabling effective sealing and also suitable for forming transverse sealing. SOLUTION: A composite film consists of a transparent support layer 1, a light absorbable thermoplastic absorbing and sealing layer (2) or absorbing layer 3 and a thermoplastic sealing layer 4. The sum total thickness of the layer 2 or layer 3 and the layer 4 becomes 10μm maximally. This composite film realizes an extremely short sealing time and a short cooling time and is held to a high rigid state even during sealing. |
