MEMBRANE SEALED CARTON

• US 3,580,483 A
• Filed: 02/20/1969
• Issued: 05/25/1971
• Est. Priority Date: 02/20/1969
• Status: Expired due to Term

• Current Assignee: Young Chauncey
• Original Assignee: Young Chauncey
• Inventors: YOUNG CHAUNCEY
• Application Number:
  US04/800,866
• Time in Patent Office: 824 Days
• US Class Current: 229/208
• CPC Class Codes: B65D 5/0272 with end closures formed by applying a web on the edge of the body, and subsequent inward folding of flaps
• CPC Class Codes: B65D 5/541 the lines of weakness being provided in one or more closure flaps
• CPC Class Codes: B65D 5/563 Laminated linings; Coatings

Abstract

The disclosure relates to improvements in tear opening structures for end filled, end sealed cartons and, more specifically, to an improved opening structure for membrane sealed cartons of the type in which a separate '"'"''"'"''"'"''"'"'safety shield'"'"''"'"''"'"''"'"' material of polyethylene coated glassine or the like is heat sealed or otherwise tightly secured to the outfolded end flaps and side flaps of a carton prior to the infolding and adhering of at least a pair of said flaps to one another to complete the end structure.

Claims

1. An end sealed carton fabricated from a thermoplastic coated sheet material including a paperboard layer and a barrier layer, said carton comprising:

a. a carton body having consecutively articulated first side, front wall, second side and rear wall panels;

b. flaps articulated to the ends of each of said wall panels along hinge lines;

c. a sealing membrane having parallel side edges;

d. means strongly bonding said membrane to the inner surfaces of all of said flaps to close off the ends of said carton;

e. a line of weakness formed in each of a pair of said flaps at one end of the carton body proximate to said hinge lines and generally coincident with said parallel side edges of the membrane;

f. the lines of weakness with said hinge lines thereby delineating the edges of narrow delamination zones in the inner stratum of the paperboard of said flaps; and

g. at least one of the remaining flaps at said one end of the carton being freely severable from said carton body along its hinge line.

2. The carton of claim 1, in which:

a. the lines of weakness are formed by a series of check-shaped cuts impressed through the blank from the outer side thereof.

3. The carton of claim 1, in which:

a. the flaps having said lines of weakness are adhered and the portions lying between said lines of weakness constitute a readily removable compound tear strip.

4. The carton of claim 1, in which:

a. one of the pairs of flaps having said lines of weakness therein further includes a tab portion at its free edge while the other flap of said pair further includes a mating slot portion.

5. The carton of claim 1, in which:

a. said freely severable flap is articulated to said carton body by cuts impressed partially, but not completely, through the sheet material.

6. The carton of claim 1, in which:

a. said front and rear walls are wider than said sidewalls;

b. said lines of weakness are formed in the flaps articulated to said front and rear walls.

7. A one-piece paperboard blank for an end-fillable carton adapted to be end sealed with a membrane of predetermined width, comprising:

a. first sidewall, front wall, second sidewall, rear wall, and glue flap panels consecutively articulated along parallel vertical score lines;

b. dust flaps articulated to the ends of said sidewall panels along horizontal fold lines, at least one of said dust flaps is articulated to a sidewall panel along a line of severance;

c. end flaps articulated to the ends of said front and rear wall panels along horizontal score lines;

d. delaminable narrow strata of paperboard formed in said end flaps and bounded by said horizontal score lines and lines of weakness parallel thereto;

e. said lines of weakness being defined by a series of cuts and being arranged to be mutually spaced a distance substantially equal to said predetermined width of the membrane sealing material when said blank is formed into a parallelepiped carton tube and said end flaps are outfolded into a horizontal plane, whereby said delaminable strata may be readily separated from the remainder of said carton tube along with said membrane.

8. The blank of claim 7, further characterized in that:

a. said cuts are check-shaped.