Method for forming a seam release strip composite container

• US 4,428,741 A
• Filed: 11/22/1982
• Issued: 01/31/1984
• Est. Priority Date: 06/04/1981
• Status: Expired due to Term

• Current Assignee: Sonoco Development Inc (Sonoco Products Company)
• Original Assignee: Boise Cascade Holdings LLC (Madison Dearborn Partners LLC)
• Inventors: Westphal, Teddy M.
• Primary Examiner(s): Coan, James F.
• Application Number:
  US06/443,700
• Time in Patent Office: 435 Days
• Field of Search: 493/109, 493/108, 493/103, 493/102, 493/87, 493/158, 493/159, 229/5.6
• US Class Current: 493/103
• CPC Class Codes: B65D 15/06 with end walls made of metal

Abstract

A composite container for fluent materials in the liquid or semi-frozen state is disclosed, together with a method for making the same. The container includes a vertically arranged body member that is flared at its upper end, and an end closure member is provided including a circular central panel portion arranged within and extending across the upper end of the body member, annular chuck wall portion extending upwardly from the central panel portion adjacent the flared portion of the body member, and an annular connecting flange portion extending radially outwardly from the upper end of the chuck wall portion. The invention is characterized in that the connecting flange and chuck wall portions cooperate with the flared portion of the body member to define an annular space in which is arranged a resilient annular mass of sealing material. A seam release strip is arranged circumferentially about the outer surface of the upper portion of the body member, the connecting flange portion of the end closure being inwardly crimped into engagement with the body member and the seam release strip, thereby causing the mass of sealing material to be compressed to seal the annular space between the end closure member and the body member.

Claims

1. A method for forming a composite container for fluent material in the liquid or semi-frozen state comprising the steps of:

(a) providing a spirally wound, vertically arranged cylindrical body member including concentrically arranged fibrous body wall and fluid impervious inner liner layers;

(b) flaring the upper end portion of said body member radially outwardly approximately 15 to 30 degrees relative to the vertical to form a terminating flared portion having a length of approximately one-sixteenth of an inch;

(c) arranging a seam release strip circumferentially about at least the flared portion of said body member;

(d) providing an end closure member for closing the upper end of said body member, said closure member comprising;

(1) a circular central panel portion;

(2) an annular chuck wall portion extending upwardly from said central panel portion; and

(3) an annular connecting flange portion extending radially outwardly from the upper end of said chuck wall portion;

(e) applying an annular bead of sealing material adjacent the junction between said flange and chuck wall portions of said end closure member;

(f) positioning said end closure member relative to the upper end of said body member to place said central panel portion within and extending transversely across the upper end of said body member and to place said chuck wall portion adjacent the outwardly flared portion of said body member, said connecting flange and chuck wall portions cooperating with the inner surfaces of said body member flared portion and the adjacent portion of said body member, respectively, to define an annular space, whereby said annular bead of sealing material is contained in at least the upper portion of said annular space; and

(g) crimping said connecting flange portion inwardly into connecting engagement with said body member and said seam release strip without causing substantial deformation of said body member, thereby causing said mass of sealing material to seal the annular space between the end closure member and the body member, whereby upon pulling of the seam release strip, the end closure member is released for removal from said body member.

2. A method for forming a composite container as defined in claim 1, wherein said sealing material is a plastisol, and further including the preliminary step of heating said end closure member to plasticize the annular bead of sealing material and causing the same to adhere to said end closure member.

3. A method for forming a composite container as defined in claim 2, and further including the step of coating the inner surface of said end closure member with a modified dispersion vinyl coating layer prior to the application of said sealing material, whereby when said end closure member is removed from said body member, said mass of sealing material adheres to said vinyl coating layer and is removed therewith.