| 摘要 |
PROBLEM TO BE SOLVED: To prevent admixtures from remaining between films for packaging by means of a transverse seal part to the films for packaging and to provide an enough heat seal strength to the whole transverse seal part. SOLUTION: In a heat seal roll provided with a rotatably driven roll 1 and transverse heat seal blades 2 provided on this roll 1, in the crosssectional face of the transverse heat seal blade 2, the distance R1 from the center of the roll of the working surface of its side part 4 is made larger than the distance R2 of the working surface of the central part 5. |
