| 摘要 |
<p>The efficient machine conveyance of inexpensive, very thin-walled packaging material, especially plastic foils, presents special problems because of the low degree of firmness of these foils. In the present apparatus, the front end of a sheet of such material and blanks severed from it are transported continuously by suction air conveying members. These consist of a suction drum and perforated belts directly adjoining the drum, with no interruption occurring in the retention of the packaging material.</p> |
