초록 ▼

A system for handling zipper-equipped wrapper sheet material to be used in a form, fill, and seal machine for wrapping product enables the wrapper sheet to be drawn from a supply with a flap sheet portion overlying a panel sheet portion and subsequently disposing the flap sheet portion such that it

A system for handling zipper-equipped wrapper sheet material to be used in a form, fill, and seal machine for wrapping product enables the wrapper sheet to be drawn from a supply with a flap sheet portion overlying a panel sheet portion and subsequently disposing the flap sheet portion such that it is folded back away from the panel sheet portion to fully open up the wrapper sheet material. The folding over of the flap sheet portion brought about by apparatus which permits continuously flow of wrapper sheet to the form, fill, and seal machine at conventional machine high speed production rates. The system is made adjustable to handle zipper-equipped wrapper sheet material of various sizes. Devices are included to ensure proper tensioning of the line of wrapper sheet material passing to the form, fill, and seal machine.

대표청구항 ▼

A method of longitudinally conducting a continuous elongated wrapper sheet to a form, fill, and seal machine taking in said wrapper sheet, said wrapper sheet having a panel sheet portion having one free end for receiving product thereon in said machine, a flap sheet portion formed by a web fold at t

A method of longitudinally conducting a continuous elongated wrapper sheet to a form, fill, and seal machine taking in said wrapper sheet, said wrapper sheet having a panel sheet portion having one free end for receiving product thereon in said machine, a flap sheet portion formed by a web fold at the other end of said panel sheet portion partially overlying said panel sheet portion width, and a reclosable zipper means in the form of a pair of cooperatively interlocked fastener profile strips extending longitudinally of said wrapper sheet and respectively disposed on facing surfaces of said panel and flap sheet portions between said web fold and a free edge of said flap sheet portion, said method comprising: providing spaced apart first and second guides at a first station wherein said first guide overlies said flap sheet portion from said web fold to beyond said zipper means but short of said free edge thereof and said second guide overlies said panel sheet portion from said free edge thereof to short of said free edge of said flap sheet portion, turning said flap sheet portion off of said panel sheet portion such that said free edge of said flap sheet portion is raised from said panel sheet portion in a gap betwen said first and second guides, folding over said flap sheet portion to expose said facing surface of said panel sheet portion previously underlying said flap sheet portion beyond said zipper means, and passing said folded over flap sheet portion beneath a third guide at a second station downstream of said first station in the direction of conduction of said wrapper sheet to said machine.