| 摘要 |
The continuously formed wrapping material tube traversing a horizontal wrapping machine, and containing articles to be wrapped therein, is sequentially passed between a first pair of opposed, counter-rotating heat sealing bar sets, and then between a second pair of opposed, counter-rotating combination heat sealing and cutting bar sets, to heat seal and cut spaced apart longitudinal sections of the tube, each positioned between an adjacent pair of articles, to form individual, article-containing packages. As each of these longitudinal tube sections passes through the first bar set, corrugated outer ends of two bars therein mesh to compress and heat seal the tube section along a corrugated heat seal area whose ridges and valleys extend transversely to the tube length. As the heat sealed tube section passes through the second bar set, corrugations in the outer ends of two bars thereof precisely mesh with each other, and with the previously formed tube section corrugations, to further heat seal the tube section along its corrugations. Complementary knife and anvil sections carried by these latter two bars transversely cut the tube section simultaneously with this secondary heat sealing operation. By virtue of this dual sealing operation, highly efficient end sealing of the resulting packages is achieved. Precise rotational control of the two rotating bar sets is achieved using a synchronized, anti-backlash gear drive system.
|
