초록 ▼

A method and apparatus are provided by which bag forming material is obtained by feeding sheet material (2) together with male and female closure elements (5, 6) to a nip between guide roller (3) and pressure rollers (9, 10) at which adhesive is applied from nozzles (11, 12). The resulting material

A method and apparatus are provided by which bag forming material is obtained by feeding sheet material (2) together with male and female closure elements (5, 6) to a nip between guide roller (3) and pressure rollers (9, 10) at which adhesive is applied from nozzles (11, 12). The resulting material assembly is fed by drive roller means (14, 15)to an accumulator (16) on a continuous basis and then intermittently over a forming shoulder (21) into a tubular form (22) while maintaining the closure elements (5, 6) at a predetermined distance apart before the forming shoulder (21) by means such as grooves (19) in guide roller (18) and locating the closure elements (5, 6) in predetermined positions facing each other downstream of the shaping shoulder by suitable means (23) which may include rotatable guide elements. The tubular form (22) is drawn through the apparatus by transverse reciprocating sealing bars (26) and a pilfer proof closure can be provided by vertical sealing bars (25).

대표청구항 ▼

A method including the steps of making and shaping a permanent assembly of bag making plastic sheet and separable and reclosable fastener strip into vertical upwardly opening tubular form adapted for gravitationally receiving bag filling contents in vertical form/fill/seal packaging; and the success

A method including the steps of making and shaping a permanent assembly of bag making plastic sheet and separable and reclosable fastener strip into vertical upwardly opening tubular form adapted for gravitationally receiving bag filling contents in vertical form/fill/seal packaging; and the successive steps of sealing lower end portions of the vertical tube into bag sections, effecting cyclical dwell and intermittent downward advancing of the tube by bag sections and severing the bag sections from the lower end of the tube; the improvement consisting in supplying the bag making assembly to said tube forming step from a location adjacent to the location of said tube forming step, and comprising the steps of: providing continuous length bag sheet material from a supply means; providing continuous length separable fastener strip from a supply means; continuously effecting joinder and securement of said sheet material and said fastener strip as derived from said supply means into a permanent assembly; at a location downstream from said joinder and securement step uninterruptedly advancing said assembly toward said shaping step, while said successive steps of tube sealing, severing and cyclical dwell and intermittent advancing of the tube continue progressively; and at a location intermediate said assembly advancing step and said tube shaping step, accumulating the uninterruptedly advancing assembly to compensate for dwells in the intermittent advance of the tube.