| 摘要 |
A mechanism includes a series of half-shells pivotally interconnected to form an endless chain of elements and forms a series of half-sections from a film drawn by vacuum into the pivotally interconnected half-shells and such half-sections are secured to another series of similarly formed half-sections to envelop a plurality of primary packages. The pairs of half-sections are then sealed together and tightened about the primary packages and are subsequently severed from each other. In order to condition the film for lining the half-sections, it is necessary to apply heat thereto and such heating is effected by supplying fluid such as heated air at a constant temperature and a at a rate which varies in accordance with variations in the velocity of movement of the film through the heating station, such movement being a function of the speed of operation of the mechanism itself.
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