Method for packaging flowable materials and apparatus for manufacturing packaging bags

Claim 1

A method for packaging a flowable material comprising forming a folded tubular packaging material by folding a flattened tubular film of a thermoplastic material so that both sides thereof are folded inward; sealing said folded packaging material at the positiOn which is to become the top after the packaging is finished; unfolding the opening spaced from the sealed portion by a predetermined distance so that the inwardly folded portions are turned outside and the opening comprises two layers; introducing said flowable material through this opening; sealing the opening in the two layer state; and pressing flat the two layer sealed end so as to form a flat bottom.

Claim 2

A method for packaging a flowable material comprising forming a folded tubular packaging material by folding a flattened tubular film of a thermoplastic material so that both sides thereof are folded inward; sealing said folded packaging material at the positiOn which is to become the top after the packaging is finished; unfolding the opening spaced from the sealed portion by a predetermined distance so that the inwardly folded portions are turned outside and the opening comprises two layers; introducing said flowable material through this opening; sealing the opening in the two layer state; and pressing flat the two layer sealed end so as to form a flat bottom.

Claim 8

An apparatus for manufacturing packaging bags comprising: a roller for supply of continuous flattened tubular film of a thermoplastic material; a long guide body for guiding the tubular film, the upper and lower ends of which are gradually reduced in thickness and width toward the tips, and which is provided with a groove on both sides and a recess at a position in the front face; supporting rollers which sustain the guide body in an upright position; a cutting edge which moves forward into the recess of the guide body at a predetermined cycle; a heat press member provided at a position spaced from the cutting edge by a predetermined distance and moving forward to the guide body at the predetermined cycle; a means for supplying a film for sealing between the heat press member and the guide body; a pair of guide plates which are provided on both sides of the guide body toward the upper end thereof and which turn inward the sides of the tubular film into the grooves provided in the sides of the guide body; a pair of pressing rollers which press flat the tubular film which has been provided with the inward side folds; a heat-sealer which seals the flat-folded tubular film at a predetermined interval; and a means for cutting off the sealed tubular film at the position immediately below the seal.

Claim 9

An apparatus for manufacturing packaging bags comprising: a roller for supply of continuous flattened tubular film of a thermoplastic material; a long guide body for guiding the tubular film, the upper and lower ends of which are gradually reduced in thickness and width toward the tips, and which is provided with a groove on both sides and a recess at a position in the front face; supporting rollers which sustain the guide body in an upright position; a cutting edge which moves forward into the recess of the guide body at a predetermined cycle; a heat press member provided at a position spaced from the cutting edge by a predetermined distance and moving forward to the guide body at the predetermined cycle; a means for supplying a film for sealing between the heat press member and the guide body; a pair of guide plates which are provided on both sides of the guide body toward the upper end thereof and which turn inward the sides of the tubular film into the grooves provided in the sides of the guide body; a pair of pressing rollers which press flat the tubular film which has been provided with the inward side folds; a heat-sealer which seals the flat-folded tubular film at a predetermined interval; and a means for cutting off the sealed tubular film at the position immediately below the seal.

Claim 10

A method for packaging a flowable material comprising forming a folded tubular packaging material by folding a flattened tubular film of a thermoplastic material so that both sides thereof are folded inwardly, sealing said folded packaging material at a position which is to become the top of the package after the packaging is finished to form a packaging bag, inserting the packaging bag in a forming case with the top of the packaging bag being in the bottom of the forming case, unfolding the opening, which is spaced apart from the sealed portion and which is to become the bottom of the packaging bag, by turning the inwardly folded portions outwardly, thereby forming two opposing layers, blowing air into the packaging bag, introducing a flowable material into the packaging bag, sealing the opening in the two layer state, pressing flat the two layer sealed end so as to form a flat bottom with triangular ears extending therefrom past the sides of the packaging bag, turning said triangular ears upwardly in alignment with said sides of the packaging bag and folding said triangular ears inwardly into the flat bottom.

Claim 11

A method for packaging a flowable material comprising forming a folded tubular packaging material by folding a flattened tubular film of a thermoplastic material so that both sides thereof are folded inwardly, sealing said folded packaging material at a position which is to become the top of the package after the packaging is finished to form a packaging bag, inserting the packaging bag in a forming case with the top of the packaging bag being in the bottom of the forming case, unfolding the opening, which is spaced apart from the sealed portion and which is to become the bottom of the packaging bag, by turning the inwardly folded portions outwardly, thereby forming two opposing layers, blowing air into the packaging bag, introducing a flowable material into the packaging bag, sealing the opening in the two layer state, pressing flat the two layer sealed end so as to form a flat bottom with triangular ears extending therefrom past the sides of the packaging bag, turning said triangular ears upwardly in alignment with said sides of the packaging bag and folding said triangular ears inwardly into the flat bottom.