GB1232955A - - Google Patents

Abstract

1,232,955. Making flat packages. MULTIVAC SEPP HAGGENMULLER K.G. 10 Feb., 1970 [12 May, 1969], No. 6363/70. Heading B8C. An apparatus for manufacturing flat vacuum packages from heat-sealable plastics foils, comprises a heat sealing and forming tool 1, 2 having a bottom and top tool part, cavities in the bottom and top tool parts 1, 2 for receiving the packages, a channel system in the tool parts communicating with the cavities for evacuating the latter and a driven sprocket chain-path 32, 17 for clamping and intermittently advancing the bottom one 6 of two foil webs 6, 10 disposed in superposed relationship, whereby to convey intermittently the webs directly to the tool. As shown, each chain 17 carries clamps 17b on angle brackets 17a for holding the bottom web 6 which is drawn from a reel 18. The top web 10 is fed from a reel 28 and both webs are fed between the tool parts 1, 2, the bottom part 1 being pivoted towards and away from the top part 1 by means comprising a driven eccentric 26. Cutting wheels 23 perforate the bottom web 6. The cavity of the top part 2 houses three recessed moulding plates 11 adapted to cooperate with a recess 1<SP>1</SP> in the bottom part 1. An electrically heated sealing plate 14 is super posed on the plates 11 and a pressure plate 19 operated by a compressed air bag 15, acts on the plate 19 to move the plates 11 and 14 into the sealing position. When the tool parts 1, 2 are closed, the bottom part 1 is sealed by a strip 3 and the cavity is evacuated via channels 4, 5, 8 and subsequently the packages are evacuated through the perforations in the web 6 and channels 12, 13 which latter may also serve for supplying an inert gas to the packages. The plate 14 is then urged against the strip 3 and a knife 16 parts a row of packages from the web. The tool is then vented through channels 8, 13 and the tool parts separated and the webs advanced by one package length.