Method for producing high gloss cup

A method for continuously producing a smooth, high gloss coating on a paper container, said paper container having a coating of hardened wax previously applied to substantially the entire outside surface thereof, 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 to thereby define an outside surface velocity of 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 outside surface velocity of said container and being applied substantially tangential to said outside surface.

A method for continuously producing a uniform, smooth, high gloss coating on a flat paper web 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 liquid 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.

A method for continuously producing a uniform, smooth, high gloss coating on a flat paper web, said flat paper web having a coating of hardened wax previously applied to substantially the entire top surface thereof, comprising the steps of:

• (a) heating said paper web 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 top surface;
• (b) imparting a constant linear velocity to said top surface of said paper web;
• (c) maintaining the temperature of said melted wax above the congealing point of said wax;
• and
• (d) applying a substantially uniform thin film of liquid 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.

A method for continuously producing a smooth, high gloss coating on a paper container 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) rotating said container at a constant angular velocity;
• and
• (d) bringing a substantially uniform thin film of liquid coolant into substantially tangential contact with said outside surface of said rotating container at a velocity such that after said contact, said liquid film follows said outside surface of said rotating container at substantially said angular velocity.

A method for continuously producing a smooth, high gloss coating of wax on a paper cup of the type having a generally cylindrical configuration, said method comprising the steps of:

• (a) applying a substantially uniform coating of melted wax material to the outside surface of said paper cup;
• (b) maintaining the temperature of said wax coating at a temperature above its melting point;
• (c) rotating said cup at a uniform spin rate to thereby define an outside surface velocity of said cup;
• (d) applying a substantially uniform film of water at a temperature below said melting point of said wax coating, said film of water being applied tangential to the rotating cup surface under laminar flow conditions and having a velocity which is substantially equal to said outside surface velocity.