| 摘要 |
<p>Upper and lower continuous films are supplied intermittently, with the upper film being supplied in a direction to form an acute angle relative to the advancing direction of the lower film. A part of the upper film is made soft and expansible by heating and is pressed upon the lower film while both films are stopped for advancement in such a manner that the softened part of the upper film encloses a material on the lower film. The space between the upper and lower films and about the material is then vacuumized, an upper vacuum box having a lower open end is provided above the upper film and has heating means and vacuum suction means therein. The upper vacuum box is moved to an inclined position, in which the lower end of the vacuum box becomes parallel to the upper film, and is then descended to a position in which the upper film is pressed upon the lower film by the lower end of the vacuum box.</p> |
