초록 ▼

A method and apparatus for successively forming, opening, filling and sealing plastic bags formed from a stock supply of plastic tubing and characterized by the elimination of handling of cut bags during formation and filling. The apparatus comprises a heat seal member and anvil for forming seals ac

A method and apparatus for successively forming, opening, filling and sealing plastic bags formed from a stock supply of plastic tubing and characterized by the elimination of handling of cut bags during formation and filling. The apparatus comprises a heat seal member and anvil for forming seals across portions of flattened plastic tubing advanced from a stock supply, a cutting blade for forming a slit partially across the flattened plastic tubing and extending through both juxtaposed portions of the flattened plastic tubing to thereby produce a sleeve defined by a seal and a slit and serially attached to the stock supply of plastic tubing across the unslit portions of the plastic tubing, suction apparatus for opening the sleeve at the slit, an injection cartridge for filling the sleeve with the desired filling material and a cutting blade for severing the filled sleeve at the slit from the remainder of the stock supply of plastic tubing while simultaneously forming a second seal across the sleeve and adjacent the severed portions thereof and while simultaneously forming a next corresponding seal across the next successive portion of flattened plastic tubing advanced from the stock supply.

대표청구항 ▼

A method of forming a foam cushion for packaging purposes wherein the foam cushion comprises a closed plastic bag substantially filled with a plastic foam, said method comprising: (a) advancing a length of plastic tubing in flattened form along a predetermined path of travel with the leading end of

A method of forming a foam cushion for packaging purposes wherein the foam cushion comprises a closed plastic bag substantially filled with a plastic foam, said method comprising: (a) advancing a length of plastic tubing in flattened form along a predetermined path of travel with the leading end of the tubing being sealed to provide a closed leading end; (b) cutting a transverse slit through both layers of the flattened tubing substantially parallel to said sealed leading end and across only a medial portion of the tubing with the slit being substantially parallel to and spaced from the closed leading end of the tubing and spaced from the side edges of the tubing to leave uncut portions adjacent the side edges; (c) moving the tubing apart adjacent the slit to provide an access opening into the tubing and thereby forming an opened bag defined by the access opening and the sealed leading end; (d) directing a foamable composition for a plastic foam into the opened bag so as to fill the bag with plastic foam; (e) closing the bag by moving the opposing sides of the bag adjacent the opening into contact with each other and then heat fusing the contacting sides of the bag; and (f) severing the uncut portions at opposite sides of the slit to completely separate the bag from the tubing and while sealing the new leading end of the tubing.