Bags

Claim 1

AN OPEN-MOUTH PLASTIC BAG ADAPTED WHEN FILLED TO HAVE A RECTANGULAR BOTTOM AND A RECTANGULAR TOP, SAID BAG BEING FORMED FROM A FLAT TUBE OF HEAT-SEALABLE SHEET PLASTIC MATERIAL AND HAVING A BOTTOM CLOSURE FORMATION AT ONE END THEREOF AND TOP CLOSURE FORMATION AT THE OTHER END, EACH OF SAID CLOSURE FORMATIONS COMPRISING A FOLDED-BACK END PORTION OF ONE OF THE WALLS OF THE TUBE WHICH IS FOLDED OVER ON THE OUTSIDE OF SAID ONE WALL ON A FIRST FOLD LINE EXTENDING TRANSVERSELY ACROSS SAID ONE WALL, AN UNFOLDED END PORTION OF THE OTHER WALL OF THE TUBE EXTENDING OUTWARD BEYOND SAID FIRST FOLD LINE OPPOSITELY TO SAID FOLDED-BACK END PORTION, AND INWARDLY DIRECTED END FLAPS AT THE CORNERS OF THE TUBE, EACH END FLAP HAVING A TRIANGULAR PORTION WITH ITS APEX AT A RESPECTIVE END OF SAID FIRST FOLD LINE, A PART OF ONE OF SAID END PORTIONS CONSTITUTING A MAIN CLOSURE FLAP WHICH IS FOLDED BACK ON A SECOND FOLD LINE EXTENDING PARALLEL TO SAID FIRST FOLD LINE AND SPACED THEREFROM HALF THE WIDTH OF THE CLOSURE FORMATION TO OVERLIE THE END FLAPS AND THE OTHER OF SAID END PORTIONS, SAID SECOND FOLD LINE DEFINING ONE SIDE OF THE CLOSURE FORMATION AND SAID FLAP EXTENDING THEREFROM TO THE OTHER SIDE OF THE CLOSURE FORMATION, EACH OF SAID CLOSURE FORMATIONS HAVING HEAT SEALS SECURING THE MAIN FLAP THEREOF TO THE RESPECTIVE END FLAPS, THE MAIN FLAP OF THE BOTTOM CLOSURE FORMATION BEING JOINED TO THE RESPECTIVE OTHER OF SAID END PORTIONS ALONG THE SAID OTHER SIDE OF THE BOTTOM CLOSURE FORMATION BY A LIP OF PLASTIC MATERIAL EXTENDING FROM ONE END PORTION AROUND THE EDGE OF THE OTHER END PORTION AND LYING ON THE OUTSIDE OF THE LATTER, AND AT HEAT SEAL FOR THE LIP ALONG A LINE EXTENDING ADJACENT SAID OTHER SIDE OF THE BOTTOM CLOSURE FORMATION FROM ONE END FLAP TO THE OTHER, THE MAIN FLAP OF THE TOP CLOSURE FORMATION BEING INITIALLY FREE OF THE RESPECTIVE OTHER OF SAID END PORTIONS ALONG THE SAID OTHER SIDE OF THE TOP CLOSURE FORMATION TO PROVIDE AN OPEN MOUTH AND ADAPTED, AFTER FILLING OF THE BAG, TO BE JOINED TO THE RESPECTIVE OTHER OF SAID END PORTIONS BY A LIP OF PLASTIC MATERIAL AND A HEAT SEAL FOR THE LIP ALONG A LINE EXTENDING ADJACENT SAID OTHER SIDE OF THE TOP CLOSURE FORMATION FROM ONE END FLAP TO THE OTHER, A STRIPE OF HEAT-SEAL-INHIBITING MATERIAL EXTENDING ACROSS ONE OF SAID END PORTIONS OF THE BOTTOM CLOSURE FORMATION BETWEEN THE END PORTIONS OF THE BOTTOM CLOSURE FORMATION ALONG THE LINE OF THE HEAT SEAL FOR THE LIP OF THE BOTTOM CLOSURE FORMATION AND INHIBITING BLOCKING OF THE BOTTOM CLOSURE FORMATION ALONG THE HEAT SEAL FOR THE LIP THEREOF, AND A STRIPE OF HEAT-SEAL-INHIBITING MATERIAL EXTENDING ACROSS ONE OF SAID END PORTIONS OF THE TOP CLOSURE FORMATION BETWEEN THE END PORTIONS OF THE TOP CLOSURE FORMATION ALONG THE LINE OF THE HEAT SEAL FOR THE LIP OF THE TOP CLOSURE FORMATION TO INHIBIT BLOCKING OF THE TOP CLOSURE FORMATION ALONG THE SUBSEQUENTLY MADE HEAT SEAL FOR THE LIP THEREOF.