초록 ▼

A plastic bag is formed, filled, sealed and separated from a continuous web of longitudinally folded plastic material. The web passes downwardly between complementary L-shaped heat sealing jaws that reciprocate and cooperate to provide seams which form a pocket that is closed after it has been fille

A plastic bag is formed, filled, sealed and separated from a continuous web of longitudinally folded plastic material. The web passes downwardly between complementary L-shaped heat sealing jaws that reciprocate and cooperate to provide seams which form a pocket that is closed after it has been filled from above and indexed downwardly. The top seam of one pocket is formed simultaneously with the bottom seam of an adjacent pocket and a weakened line of juncture is provided therebetween. Grippers carried on the heat sealing jaws engage opposite sides of the plastic web above the location of the top seam of the filled pocket and cooperate with a separator that tensions the web along the weakened line to rupture the filled pocket from the web while the web is still in a thermally weakened condition.

대표청구항 ▼

Apparatus for filling plastic bags formed from a web of plastic material, comprising: frame means for receiving said web, means for guiding said web in a longitudinally folded manner downwardly into the frame means, complementary heat sealing jaw means mounted in said frame for lateral reciprocation

Apparatus for filling plastic bags formed from a web of plastic material, comprising: frame means for receiving said web, means for guiding said web in a longitudinally folded manner downwardly into the frame means, complementary heat sealing jaw means mounted in said frame for lateral reciprocation relative to said folded web to provide a longitudinal side seam and a transverse bottom seam cooperable with said folded web to provide an upwardly open pocket and to form a transverse top seam for closing the pocket after the web has been advanced downwardly a predetermined extent relative to the frame means, drive means connected to said heat sealing means for effecting said reciprocation thereof and for applying to said web a predetermined pressure for forming said seams, gripper means carried on said jaw means for releasably engaging opposite sides of said web above the location of formation of said top seam of said pocket, and separator means mounted in said frame means below said gripper means for frictionally engaging opposite sides of said web below the location of formation of said top seam therein and cooperable in timed relation with said heat sealing means during formation of said top seam to tension said web longitudinally and thereby to cause a filled and closed bag to be formed and separated from the folded web, whereby plastic bags are filled and closed in a continuous manner.