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    • 6. 发明专利
    • DRAW TAPE MACHINES AND METHODS
    • CA2192642C
    • 2006-02-14
    • CA2192642
    • 1996-12-11
    • CMD CORP
    • SELLE PAUL AGIETMAN PETER J JRDUTTER TIMOTHY RJANSEN THOMAS CSLAMA FRANK M
    • B31B19/74B31B19/90B31B21/74B31B23/74B31B25/74
    • This invention pertains to draw tape equipment, and methods for incorporating draw tapes into plastic and like bags. In general, a continuous plastic web is slit at a slitting station to form layers, and respective free edges. The web then passes to a hole forming station where holes are formed in the top and bottom layers adjacent the free edges. After holes are punched, edge regions of the top and bottom layers are separated from each other, followed by forming of hems in the separated layers at hem forming stations arranged in parallel with each other. Concurrent with forming of the hems, continuous draw tapes are fed to the hem forming stations and the hems are formed about the draw tapes. The formed hems, with the draw tapes incorporated therein, optionally pass through transverse stretching apparatus and/or through electrostatic pinning apparatus and/or through first temperature control stations where the temperature of the plastic web is controlled to a desired temperature before hem sealing. The formed hems are then sealed to the main bodies of the respective top and bottom layers. The sealed hems optionally pass through second temperature control stations to cool the web. The edge regions of the layers are then rejoined, in face-to-face relationship with each other.
    • 8. 发明专利
    • FR2568821B1
    • 1987-03-20
    • FR8412564
    • 1984-08-08
    • CLAIREFONTAINE PAPETERIES
    • GOETHALS ROGER
    • B31B19/00B31B25/74B65B51/02
    • The invention relates to a gumming unit for a machine for manufacturing envelopes, of the type comprising two adhesive-dispensing rollers which dip into a tank of adhesive, and a gumming cylinder. The shaft 22 of the gumming cylinder 14 is mounted rotatably in bearings 24 carried by the ends of lever arms 26, 28, which arms are fastened via their other end to a second shaft 30 mounted so as to swivel in the stationary frame of the machine, the gumming cylinder being entrained in rotation by a transmission comprising a first pinion 34, wedged on the shaft 36 of a cylinder 32 which is entrained by the main motor of the machine, a double pinion 38, 39 rotating freely on the said second shaft 30, a second pinon 40 wedged on the said first shaft 22 and two belts 42, 44 winding respectively around the said first pinion 34 and the double pinion 38, 39 and around the latter and the second pinion 40.