Container end construction

• US 4,621,763 A
• Filed: 09/12/1985
• Issued: 11/11/1986
• Est. Priority Date: 09/12/1985
• Status: Expired due to Term

• Current Assignee: International Paper Company
• Original Assignee: International Paper Company
• Inventors: Brauner, Arne H.
• Primary Examiner(s): Price, William
• Assistant Examiner(s): Elkins, Gary E.
• Application Number:
  US06/775,293
• Time in Patent Office: 425 Days
• Field of Search: 229/5.5, 229/5.6, 229/5.8, 229/21, 229/48 SA, 229/48 SB, 229/48 T, 229/4.5, 229/1.5 B, 493/59-62, 493/109, 493/157, 493/308, 493/399, 156/69
• US Class Current: 229/5.5
• CPC Class Codes: B65D 3/18 and secured by rolling in the end of the body

Abstract

A paperboard container having a side wall formed from a single blank. A band or zone along one edge of the blank is provided with a plurality score lines each of whose edges are non-parallel to thereby yield a wedge score indentation. The blank is rolled to assume a round or rectangular cross-section tube, and the band is bent inwardly and sealed against a closure disc or panel. By virtue of the wedge shape of the scores, the resultant gathers in the band are substantially confined within the wedge scores to yield a more uniform seal between the inwardly bent band and the closure disc or panel.

Claims

1. A blank for forming a side wall and a portion of an end closure of a tube type container, the blank being formed of resilient, stiff and bendable sheet stock, such as paperboard, the blank including a lower rim and a band running therealong, the band having a plurality of generally wedge shaped scores therein, the scores being spaced from each other along said band, each score including a narrow end and a widest end, the widest ends of the scores being at the rim of the band, a continuous score of substantially uniform width running parallel to said rim and spaced therefrom and contiguous with the narrow ends of the scores, the band being adapted to be bent inwardly to form folds after the blank has been formed into a tube, the band also being adapted to contact and seal against an end closure disc or panel, so that the folds in the band are at least substantially contained within the wedge shaped scores to yield an improved seal of the inwardly folded band and the closure disc or panel.

2. The blank of claim 1 wherein said score running parallel with said rim communicates with the narrow ends of the wedge shaped scores.

3. The blank of claim 1 wherein the wedge shaped scores are uniformly spaced from each other.

4. The blank of claim 3 further comprising interscore regions between the wedge shaped scores, and wherein the width of the widest portion of each wedge shaped score, measured along said rim, is at least as great as the width of the interscore regions, also measured along said rim.

5. The method of making a tube-type container from a single blank of stiff, resilient and bendable sheet material, such as paperboard, and from an end closure disc having a periphery, comprising the steps of forming a plurality of wedge shaped scores along an edge band of the blank, bending the blank to form a tube, placing the end closure disc adjacent one open end of the tube to close said open end, bending the wedge shaped scores inwardly to form folds and gathers which abut the periphery of the closure disc on one surface thereof, fixing the bent-in wedge shaped scores to said disc periphery, whereby the folds and gathers of the edge band are each of substantially the same configuration.

6. The method of claim 5 wherein the wedge shaped scores include narrow ends which are spaced inwardly from a lower rim of said edge band, including the additional step of making a continuous score line in the blank, on the same blank side as the wedge shaped scores, the continuous score line communicating with the narrow ends of the wedge shaped scores.

7. The method of claim 5 wherein the wedge shaped scores include widest ends located at a lower rim of said edge band, and the wedge shaped scores further include interscore regions, the width of the widest portion of each wedge shaped score, measured along said edge band, is at least as great as the width of the interscore regions, also measured along said edge band.

8. The method of making a tube-type container of generally rectangular cross-section from a unitary blank of stiff, resilient and bendable sheet material, such as paperboard, and from a rectangular end closure, the method including the steps of providing an end forming edge band of the blank with a plurality of spaced groups of wedge shaped scores, each wedge shaped score having a widest part at a free edge of said end forming edge of blank, removing a portion of the widest portion of each wedge shaped score to thereby define a notch having non-parallel sides at each wedge-shaped score, bending the blank to form a container side wall of rectangular cross-section, positioning the end closure adjacent said end of the blank to close that end, each group of notches being adjacent a corner bend of the tube, bending the edge band inwardly so as to lie flat against the end closure, the non-parallel, opposite edges of each notch abutting one another in the regions of the corners of the end closure, whereby the edge band of the completed end closure lies in a single plane, and securing the bent band to the end closure.