초록 ▼

A collapsible bulk bag which when filled with material has a generally cubical configuration with a pair of end walls and rectangular sidewalls extending between them with all of the walls being of a flexible material. Bowing and bulging of the sidewalls from a planar configuration is retarded and r

A collapsible bulk bag which when filled with material has a generally cubical configuration with a pair of end walls and rectangular sidewalls extending between them with all of the walls being of a flexible material. Bowing and bulging of the sidewalls from a planar configuration is retarded and restrained by loops of cord operably connected with the sidewalls. Preferably the loops of cord having portions inside the bag extending obliquely between adjacent sidewalls when the bag is filled. Method and apparatus for making the bag with the double knotted loops of cord are also disclosed.

대표청구항 ▼

The method of making a bulk bag comprising, providing a tubular blank of a flexible material, folding the blank so that it has eight overlying generally flat panels with adjacent panels connected together along adjacent side edges and top and bottom panels directly connected together along one of th

The method of making a bulk bag comprising, providing a tubular blank of a flexible material, folding the blank so that it has eight overlying generally flat panels with adjacent panels connected together along adjacent side edges and top and bottom panels directly connected together along one of their side edges, forming a first loop by passing one end of a first piece of cord through all eight of the folded overlying panels at a first location spaced between the side edges thereof and adjacent such directly connected side edges of the top and bottom panels, and securely connecting together portions of the first cord adjacent the free end thereof to provide a closed loop encircling such directly connected side edges of the top and bottom panels and having a predetermined length such that when the tubular blank is expanded into a bag and filled the panels form four generally rectangular sidewalls disposed in a generally rectangular cross section and the first loop has first portions extending in the bag obliguely between each pair of adjacent sidewalls and merging into second portions extending along the outside of central regions of associated sidewalls, and with the first loop having an overall length such that when the bag is filled, bowing and bulging of the sidewalls is restrained and retarded by the first loop of cord, forming at least one second loop spaced from the first loop by passing one end of a second piece of cord through all eight of the folded overlying panels at a second location spaced from the first location and between the side edges directly connected together of the top and bottom panels, and securely connecting together portions of the second cord adjacent the free end thereof to form a second closed loop encircling such directly connected side edges of the top and bottom panels and having a predetermined length such that when the tubular blank is expanded into a bag and filled the panels form four generally rectangular sidewalls disposed in a generally rectangular cross section and the second loop has first portions extending in the bag obliquely between each pair of adjacent sidewalls and merging into second portions extending along the outside of the central regions of associated sidewalls, and with the second loop having an overall length such that when the bag is filled, bowing and bulging of the sidewalls is restrained and retarded by the second loop of cord.