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    • 6. 发明授权
    • Plastics bags production
    • 塑料袋生产
    • US4300892A
    • 1981-11-17
    • US076440
    • 1979-09-17
    • John G. BarnesCharles R. Murray
    • John G. BarnesCharles R. Murray
    • B31B1/64B31B1/84B31B19/60B31B19/64B31B19/84B31B23/60B31B1/66
    • B29C66/8511B29C65/18B29C65/305B29C66/1122B29C66/244B29C66/3452B29C66/431B29C66/81427B31B2219/603B31B2219/9058Y10S493/929
    • In the production of plastics bags, especially valved bags, from a web of plastics material by folding in the side margins of the web to form overlapping panels which are then longitudinally heat-sealed together for a major portion of one bag length, and then heat-sealing the web transversely and severing the web at intervals to produce individual bags, the two overlapping panels are heat-sealed together by forming two longitudinal seals which partially overlap to provide a forward longitudinal seal and a rear longitudinal seal with respect to the direction of travel of the web, the rear longitudinal seal of each bag being formed simultaneously with the forward longitudinal seal of the adjacent following bag. The apparatus comprises a pair of heat-sealing elements equipped for simultaneous operation and arranged for forming the rear seal in one bag and the forward seal in the following adjacent bag. The two elements may be a fixed distance apart, and at least one has suitably a hairpin shape.
    • 在通过在幅材的侧边缘折叠以形成重叠面板的塑料材料的卷材生产塑料袋,特别是阀袋中,然后将其纵向热密封在一起,使其长度大于一个袋子的长度,然后加热 - 横向地切割腹板并且间隔切断腹板以产生单独的袋子,通过形成两个纵向密封件将两个重叠的面板热封在一起,所述两个纵向密封件部分地重叠以提供相对于 腹板的行进,每个袋的后纵向密封件与相邻的后袋的前纵向密封同时形成。 该装置包括一对装配用于同时操作并被设置成用于在一个袋子中形成后密封件并且在随后的相邻袋子中的前密封件的热封元件。 两个元件可以是固定的距离,并且至少一个元件具有合适的发夹形状。