| 摘要 |
A continuous tubular film passes through two opposed vacuum plates. One of the vacuum plates has a heated die formed therein. The film is pillowed and a portion contacts the die. A section is cut from the film and removed and, subsequently, the pillowed film is deflated. These steps are repeated in timed sequence. The apparatus and process allows the forming of apertures or sections in one side of a tubular film alone.
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