초록 ▼

A plastic bag is formed, filled, sealed and separated from continuous webs of plastic material. The webs pass downwardly between complementary U-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

A plastic bag is formed, filled, sealed and separated from continuous webs of plastic material. The webs pass downwardly between complementary U-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 webs above the location of the top seam of the filled pocket and cooperate with a separator that tensions the webs along the weakened line to rupture the filled pocket from the webs while the webs are still in a thermally weakened condition.

대표청구항 ▼

Apparatus for filling plastic bags formed from a plurality of webs of plastic material, comprising: frame means for receiving said webs, means for guiding said webs longitudinally downward into face-to-face juxtaposition into the frame means, complementary heat sealing jaw means mounted in said fram

Apparatus for filling plastic bags formed from a plurality of webs of plastic material, comprising: frame means for receiving said webs, means for guiding said webs longitudinally downward into face-to-face juxtaposition into the frame means, complementary heat sealing jaw means mounted in said frame for lateral reciprocation relative to said webs to provide longitudinal side seams and a transverse bottom seam cooperable with said webs to provide an upwardly open pocket and to form a transverse top seam for closing the pocket after the webs have 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 webs a predetermined pressure for forming said seams, gripper means carried on said jaw means for releasably engaging opposite sides of said webs 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 webs 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 webs longitudinally and thereby to cause a filled and closed bag to be formed and separated from the webs, whereby plastic bags are filled and closed in a continuous manner.