Filing Information

Inventor(s)	Richard E. Fredricks · Michael A. Breining · William R. Pucci · Donald C. McCarthy · David C. Brown · Richard A. Segan · Walter Malakhow ·
Assignee(s)	Fort James Corporation ·  View assignee updates
Attorney/Agent(s)	Burns, Doane, Swecker & Mathis, L.L.P. ·
Primary Examiner	Eugene Kim ·
Application Number	US9087956
Filing date	06/01/1998
Issue date	10/10/2000
Predicted expiration date	06/06/2017
U.S. Classifications	493/110  · 493/903  ·
International Classifications	B31B 100  ·
Kind Code	A
International Classifications	49352;110;903 ·
Related U.S. Application Data	This application is a continuation-in-part application of U.S. Ser. No. 08/870,486, filed Jun. 6, 1997, the contents of which are hereby incorporated by reference.

Patent Family

Abstract

A heat insulating paper cup having an improved seal. The cup can include a body member having an inside surface and an outside surface, and a bottom panel member having a upper surface and a bottom surface. The body member is coated (or in some instances partially coated) on its outside surface with a foamed low density polyethylene, and on its inside surface with an unfoamed modified low density polyethylene. The bottom panel member is coated on its upper surface with a foamed or an unfoamed low density polyethylene or foamed or unfoamed modified low density polyethylene. The body member and bottom panel member are oriented and joined to form a heat seal at an interface between a portion of the unfoamed modified low density polyethylene coated on the inside surface of the body member and a portion of unfoamed low density polyethylene or unfoamed modified low density polyethylene coated on the upper surface of the bottom panel member.

Independent Claims | See all claims (20)

1. 1. A method for fabricating a heat insulating paper container from a paper-based body member with an inside surface and an outside surface, and a paper-based bottom panel member with an upper surface and a bottom surface, said method comprising:applying to the inside surface of said body member an inside surface laminate of a polyethylene component effective to prevent penetration of liquid into the paper during use, and applying to said outside surface an outside surface laminate of foamable low density polyethylene, wherein the inside surface laminate is selected from a material effective to form an improved seal between the bottom panel member and the body member of a twelve ounce cup fabricated at a speed of about 165 cups/minute by a HORAUF MODEL BMP-200 machine with temperature controls set at between about 350.degree. to about 460.degree. C. and a bottom expansion pressure set at about 3000 kilopascals for two revolutions per cup; andfabricating said container so that said body member is bonded to said bottom panel member, and said outside surface laminate of low density polyethylene is foamed.
2. 3. A method for fabricating a heat insulating paper container from a paper-based body member with an inside surface and an outside surface, and a paper-based bottom panel member with an upper surface and a bottom surface, said method comprising:applying to the inside surface of said body member an inside surface laminate of a modified low density polyethylene which is not foamable under fabrication conditions, applying to said outside surface of said body member an outside surface laminate of low density polyethylene which is foamable under fabrication conditions, and applying to the upper surface of said bottom panel member a low density polyethylene or modified low density polyethylene; andorienting and joining said bottom member and said body panel member to form a heat seal at an interface between a portion of the unfoamed modified low density polyethylene coated on the inside surface of the body member and a portion of the low density polyethylene or the modified low density polyethylene coated on the upper surface of the bottom panel member,wherein the modified low density polyethylene is selected from materials effective to provide an improved seal between the bottom panel member and the body member of a twelve ounce cup fabricated at a speed of 165 cups/minute by a HORAUF MODEL BMP-200 machine with temperature controls set at between about 350.degree. to about 460.degree. C. and a bottom expansion pressure set at about 3000 kilopascals for two revolutions per cup.