Claims
- 1. A method of making a plurality of collapsible bags which when expanded have a pair of spaced apart generally square ends interconnected by four generally rectangular side walls comprising; forming from an elongate web of a flexible material a plurality of substantially identical tubular blanks, each blank having a circumferentially continuous central portion and four substantially identical isosceles triangular portions adjacent each end thereof and each of which is integral with the central portion and without producing any substantial amount of waste material of the web between adjacent ends of adjacent blanks by severing the web along a zig zag line having substantially straight segments defining the sides of the isosceles triangular portions with said sides of each triangular portion being substantially at a right angle to each other, on each end of each tubular blank connecting together adjacent sides of adjacent triangular portions along connection lines extending from the central portion toward the apexes of the associated triangular portions at least one third of the length of such adjacent sides to provide when the bag is filled substantially square ends of the bag, and in at least one square end terminating each such line of connection short of the apexes of its associated triangular portions so as to form an opening through such one square end adjacent the center thereof, whereby when each bag is filled with material it has a pair of generally square ends interconnected by generally transversely extending side walls and when empty can be collapsed into a configuration having a pair of generally flat overlying panels with a generally hexagonal shape and a pair of folded gusset panels extending inwardly between the flat panels.
- 2. The method of claim 1 which also comprises providing the web in the form of an elongate and circumferentially continuous tube of flexible material before severing the blanks and having a configuration with two generally flat and overlying layers of material when severing them to form the blanks.
- 3. The method of claim 1 which also comprises providing the web in the form of an elongate and circumferentially continuous tube of flexible material before severing the web to form the blanks and having four generally flat and overlying layers of material when severing them to form the blanks.
- 4. The method of claim 1 which also comprises providing the web in the form of an elongate and circumferentially continuous tube of flexible material before severing the web to form the blanks and having a configuration with eight generally flat and overlying layers of material when severing them to form the blanks.
- 5. The method of claim 4 wherein the eight overlying layers are all severed along a straight line across the entire width of the folded tube by the same severing means.
- 6. The method of claim 1 wherein after being severed and before connecting the adjacent sides of adjacent triangles, each tubular blank is arranged in a configuration having a pair of generally flat overlying panels with a generally hexagonal shape with a pair of folded gusseted panels received therebetween, and while such blank is in such configuration the adjacent sides of adjacent triangular portions of each blank are connected together throughout at least one third of their length along such lines of connection.
- 7. The method of claim 2 wherein after being severed and before connecting the adjacent sides of adjacent triangles, each tubular blank is arranged in a configuration having a pair of generally flat overlying panels with a generally hexagonal shape with a pair of folded gusseted panels received therebetween, and while such blank is in such configuration the adjacent sides of adjacent triangular portions of each blank are connected together throughout at least one third of their length along such lines of connection.
- 8. The method of claim 4 wherein after being severed and before connecting the adjacent sides of adjacent triangles, each tubular blank is arranged in a configuration having a pair of generally flat overlying panels with a generally hexagonal shape with a pair of folded gusseted panels received therebetween, and while such blank is in such configuration the adjacent sides of adjacent triangular portions of each blank are connected together throughout at least one third of their length along such lines of connection.
- 9. The method of claim 1 wherein at only one end of each blank each line of connection of adjacent sides of adjacent triangular portions extends substantially to their apexes so as to provide a completely closed end of the bag.
- 10. The method of claim 1 which also comprises providing a circumferentially continuous tubular spout of a separate piece of a flexible material, disposing an end portion of the tubular spout in a central opening in one end of the blank formed by the triangular portions and connecting the spout adjacent such end portion to such triangular portions along a line of connection extending at least substantially around the periphery of the spout.
- 11. The method of claim 10 wherein the line of connection of the spout to its associated triangular portions is substantially rectangular with its corners closely adjacent the points of termination of the lines of connection of the adjacent sides of its associated triangular portions to which the spout is connected.
- 12. The method of claim 10 wherein such line of connection of the spout to its associated triangular portions is spaced from the apexes of such triangular portions and the parts of the triangular portions extending beyond such line of connection are constructed and arranged to provide flaps which can be disposed to overlie the spout.
- 13. The method of claim 12 which also comprises providing a grommet in each triangular portion associated with the spout adjacent the apex thereof and spaced from the line of connection of the spout to its associated triangular portions.
- 14. The method of claim 10 wherein at only one end of each blank each line of connection of adjacent sides of adjacent triangular portions extends substantially to their apexes so as to provide a completely closed end of the bag.
- 15. The method of claim 10 which also comprises providing a cover flap of a flexible material constructed and arranged to removably overlie the central opening with which such spout is associated and at least in part to underlie at least a portion of the part of at least one of the triangular portions extending beyond the line of connection of such triangular portion to such spout, and connecting such flap to such part of such one triangular portion.
- 16. The method of claim 15 which also comprises providing a grommet in such cover flap adjacent a free edge thereof.
- 17. The method of claim 1 which also comprises providing two central openings in the blanks, a first tubular spout and a second tubular spout each of a separate piece of material which is circumferentially continuous and flexible, disposing the first spout in one central opening of the blank with an end portion lapping the triangular portions of such opening and connecting such first spout to such triangular portions along a line of connection extending at least substantially around the periphery of such first spout, and disposing the second spout in the other central opening of such blank with an end portion lapping the triangular portions of such other central opening and connecting such second spout to such triangular portions along a line of connection extending at least substantially around the periphery of such second spout.
- 18. The method of claim 1 which also comprises providing at least two separate straps of a flexible material each forming a lifting loop having a pair of runs, and connecting the runs of the loops to the central portion of the blank so the loops are adjacent diagonally opposed corners of one of the generally square ends formed by triangular portions of the blank.
- 19. The method of claim 1 which also comprises providing four separate straps of a flexible material each forming a lifting loop having a pair of runs, and connecting the runs of the loops to the central portion of the blank so each loop is adjacent one of the four corners of one of the generally square ends formed by the triangular portions of the blank.
- 20. The method of claim 10 which also comprises providing four separate straps each of a flexible material each forming a lifting loop having a pair of runs, and connecting the runs of the loops to the central portion of the blank so each loop is adjacent one of the four corners of the one of the generally square ends formed by the triangular portions to which the spout is connected.
- 21. The method of claim 1 wherein such flexible material is a plastic material, and such connections are heat seals extending along such lines of connection.
- 22. The method of claim 1 wherein such flexible material is a fabric material and such connections are a series of stitches of thread extending along such lines of connection.
- 23. The method of claim 1 wherein such flexible material is a woven fabric material.
- 24. The method of claim 1 wherein such flexible material is a plastic material.
REFERENCE TO CO-PENDING APPLICATION
This is a divisional application of co-pending U.S. patent application Ser. No. 058,924 filed on June 5, 1987.
US Referenced Citations (5)
Foreign Referenced Citations (4)
Number |
Date |
Country |
256094 |
Apr 1963 |
AUX |
1931783 |
Mar 1971 |
DEX |
1101249 |
Oct 1955 |
FRX |
1525870 |
May 1968 |
FRX |
Divisions (1)
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Number |
Date |
Country |
Parent |
58924 |
Jun 1987 |
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