High gloss paper cup

• US 5,085,366 A
• Filed: 06/27/1991
• Issued: 02/04/1992
• Est. Priority Date: 05/26/1989
• Status: Expired due to Fees

• Current Assignee: Sweethart Cup Company Incorporated
• Original Assignee: Sweetheart Cup Company, Inc. (Robert Charles Dart)
• Inventors: Matheson, Derek S., Kennet, Carlton L., Hammett, Daniel E., Durgin, Ronald A., Border, Delvin K.
• Primary Examiner(s): Elkins, Gary E.
• Application Number:
  US07/722,314
• Time in Patent Office: 222 Days
• Field of Search: 229/1.5 B, 229/3.1, 229/4.5
• US Class Current: 229/400
• CPC Class Codes: B05D 1/002 the substrate being rotated
• CPC Class Codes: B05D 2203/22 Paper or cardboard
• CPC Class Codes: B05D 2501/10 Wax
• CPC Class Codes: B05D 3/00 Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials successively applying liquids or other fluent materials B05D1/36; drying ovens F26B
• CPC Class Codes: B05D 3/12 by mechanical means

Abstract

A method is described for continuously producing a smooth, high gloss coating on a paper container comprising the steps of applying a substantially uniform coating of melted wax material to the outside surface of the container or sheet stock, maintaining the temperature of the wax coating above its melting point and above its congealing temperature, imparting a constant surface velocity to the outside surface of the container or sheet stock and applying a substantially uniform film of liquid coolant, particularly water, to the outside surface of the container or sheet stock whereby the surface velocity of the coolant is substantially equal to the surface velocity of the container or sheet stock.

Claims

1. A paper cup of the type having a smooth, high gloss coating and being produced by the method comprising the steps of:

(a) applying a substantially uniform coating of melted wax material to at least the outside surface of said container;

(b) maintaining the temperature of said wax coating at a temperature above its melting point;

(c) imparting a constant angular velocity to said container; and

(d) applying a substantially uniform thin film of liquid coolant to said outside surface of said container, said coolant having a linear velocity substantially equal to said absolute surface velocity of said container and being applied substantially tangential to said outside surface.

2. A paper cup of the type having a smooth, high gloss coating and being produced by the method comprising the steps of:

(a) heating said paper container and said wax coating to a temperature above the congealing temperature of said wax for a time sufficient to cause said wax to form a uniform liquid film on said outside surface;

(b) imparting a constant angular velocity to said container;

(c) maintaining the temperature of said wax coating at a temperature above its melting point; and

(d) applying a substantially uniform thin film of liquid coolant to said outside surface of said container, said coolant having a linear velocity substantially equal to said absolute surface velocity of said container and being applied substantially tangential to said outside surface.

3. A paper cup of the type having a smooth, high gloss coating formed on he outside surface thereof comprising:

(a) a paper substrate formed in a truncated cone configuration to thereby define an outside surface portion thereof;

(b) a substantially uniform coating of wax material applied to said outside surface of said cup; and

(c) a substantially uniform film of liquid coolant overlaying and contacting said uniform layer of wax material, said coolant covering a portion of said outside surface of said cup during the formation of said smooth, high gloss coating.

4. A flat paper web of the type having a smooth, high gloss coating and being produced by the method comprising the steps of:

(a) advancing said flat paper web along a horizontal path while applying a substantially uniform coating of melted wax material to the top surface thereof;

(b) maintaining the temperature of said melted wax above the congealing point of said wax material for a time sufficient to cause said wax material to form a uniform liquid film across the top surface of said flat paper web;

(c) imparting a constant linear velocity to said coated surface of said flat paper web; and

(d) applying a substantially uniform thin film of lqiuid coolant to said coated surface of said flat paper web, said coolant having a linear velocity substantially equal to said linear velocity of said flat paper web and being applied substantially tangential to said coated surface.

5. A flat paper web of the type having a smooth, high gloss coating formed on the top surface thereof comprising:

(a) a flat paper substrate;

(b) a substantially uniform coating of wax material applied to said outside surface of said flat paper web; and

(c) a substantially uniform film of liquid coolant overlaying and contacting said uniform layer of wax material, said coolant covering a portion of said outside surface of said flat paper web during the formation of said smooth, high gloss coating.