Claims
- 1. A tubular container having a readily removable corrugated side wall comprising:
- a corrugated inner sheet having a selected length and width and formed with the lateral ends of said inner sheet that define said length being adjacent each other to define a corrugated tubular inner ply of said container side wall;
- a bottom wall member engaged with the lower edge of said corrugated inner sheet and shaped to form the bottom of said container;
- a flat outer sheet having a selected length defined by lateral ends and a width defined by axially opposite edges which is greater than the width of the corrugated inner sheet, said outer sheet joined to said corrugated inner sheet to define a tubular outer ply of said side wall, with the lateral ends of said outer sheet adjacent each other and with a portion of said outer sheet projecting beyond said lower edge of said corrugated inner sheet and folded against and secured to said bottom wall member so that said inner sheet and outer sheet cooperate to restrain upward or downward movement, respectively, of said bottom wall member;
- said outer sheet and said bottom wall member defining a frangible joint along which said side wall can be severed from said bottom wall without severing said corrugated inner wall, so that the corrugated inner wall adds rigidity to said package without interfering with the ready removal of the side wall from the bottom wall; and
- the adjacent lateral ends of said inner sheet being unsealed to one another across said inner sheet which facilitates said removal of said side wall.
- 2. A container in accordance with claim 1 wherein the selected length of said flat outer sheet is longer than said corrugated inner sheet, so that a portion of one of said ends of said outer sheet forms a pull tab which can be gripped to sever the side wall from said bottom wall.
- 3. A container in accordance with claim 2 wherein the adjacent lateral ends of said corrugated inner sheet are joined to said outer sheet in non-overlapping substantially abutting relationship in the vicinity of said pull tab so that said side wall can be removed from said bottom wall without interference from said corrugated inner sheet.
- 4. A container in accordance with claim 1 wherein portions of the inner and outer sheets and said bottom wall member are secured together by being coated with a heat sensitive coating which is self-adhering upon the application of heat in a selected temperature range.
- 5. A container in accordance with claim 4 wherein said heat-sensitive coating comprises polyethylene has a melting point in the range of approximately 230.degree. F. to 280.degree. F.
- 6. A container in accordance with claim 4 wherein said inner sheet comprises lightweight paper sheet material coated on the outer side with heat-sensitive polyethylene; said outer sheet comprises lightweight paper sheet material coated on the inner side with heat-sensitive polyethylene; and said bottom wall member comprises paper material coated on the lower side with heat-sensitive polyethylene, so that said engaged portions of said sheets and wall member are self-adhering polyethylene.
- 7. A container in accordance with claim 6 wherein said inner and outer sheets comprise lightweight paper sheet material having a base weight in the range of approximately 30 to 40 pounds.
- 8. A container in accordance with claim 1 wherein the inside surface of said inner sheet has a first heat-sensitive coating with a first selected melting point range and portions of the inner and outer sheets and said bottom wall member have heat-sensitive coatings with a second selected melting point range below said first melting range, so that the application of heat to said container in said second melting point range will heat-seal said inner and outer sheets together and said outer sheet to said bottom wall without melting said first heat-sensitive coating.
- 9. A tubular container having a readily removable and moisture-resistant corrugated side wall comprising:
- a corrugated inner sheet having a selected length and width and formed with the lateral ends of said inner sheet that define said length being adjacent each other to define a corrugated tubular inner ply of the container side wall, with said inner sheet having a moisture-resistant inner coating having a first selected melting point range and a heat-sensitive outer coating having a second selected melting point range below said first melting point range;
- a bottom wall member engaged with the lower edge of said corrugated inner sheet and shaped to form the bottom wall member of said container, with at least the periphery of the outer surface of said bottom wall member including a heat-sensitive coating having said second melting point range;
- a flat outer sheet having a selected length defined by lateral ends and a width defined by axially opposite edges which is greater than the width of said corrugated inner sheet to define a tubular outer ply of the container side wall, with the lateral ends of said outer sheet adjacent each other and with the inner surface of said outer sheet having a heat-sensitive coating having said second melting point range and sealed to said heat-sensitive coating of said corrugated inner sheet and with a portion of said outer sheet projecting beyond said lower edge of said corrugated inner sheet and folded against and sealed to the heat-sensitive coating of said bottom wall member, so that the inner and outer sheets restrain movement of said bottom wall member, and said bottom wall and said outer sheet cooperate to define a frangible joint along which said side wall can be severed from said bottom wall without severing the corrugated inner sheet, so that the corrugated inner wall adds rigidity to said package without interfering with the ready removal of said side wall and the adjacent lateral ends of said inner sheet being unsealed to one another across said inner sheet which facilitates said removal of said side wall.
- 10. A container in accordance with claim 9 wherein said heat-sensitive coating applied to the inner and outer sheets and said bottom wall member comprises polyethylene.
- 11. A container in accordance with claim 10 wherein the inner surface of said inner sheet is coated with moisture-resistant polypropylene.
- 12. A container in accordance with claim 11 wherein the melting point of said polypropylene coating is approximately 280.degree. F., and the melting point of said polyethylene is approximately 230.degree. F., so that the application of heat to said coatings in the range of approximately 230.degree. F. to approximately 280.degree. F. seals the engaged polyethylene coatings without melting the moisture-resistant polypropylene coating.
Parent Case Info
This application is a division of application Ser. No. 974,065, filed Dec. 28, 1978, for "Apparatus for Making Corrugated Packages", which application issued on Feb. 17, 1981, as U.S. Letters Pat. No. 4,250,797.
US Referenced Citations (15)
Divisions (1)
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Number |
Date |
Country |
Parent |
974065 |
Dec 1978 |
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