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Wax briquettes

IP.com Disclosure Number: IPCOM000030456D
Publication Date: 2004-Aug-13
Document File: 9 page(s) / 46K

Publishing Venue

The IP.com Prior Art Database

Related People

David Cochrane: ATTORNEY [+4]

Related Documents

US 4,822,380: PATENT [+2]

Abstract

A stronger and improved coating for solid fuel elements. According to a first aspect of the invention there is provided a coating for a solid fuel element, the coating including a wax and a copolymer resin.

This text was extracted from a Microsoft Word document.
This is the abbreviated version, containing approximately 24% of the total text.

BACKGROUND OF THE INVENTION

This invention relates to solid fuel elements.

United States Patent No. 4,822,380 discloses a carbonaceous fuel, such as coal, charcoal or charcoal briquettes, which incorporates a flammable liquid and which is covered with a coating of a wax material.  A drawback with the use of the wax material disclosed in this document is that the wax material does not have great strength.  As a result a latex coating is used, in preference to a wax coating, for coal.

It is an object of this invention to provide a stronger and improved coating for solid fuel elements.

 

SUMMARY OF THE INVENTION

According to a first aspect of the invention there is provided a coating for a solid fuel element, the coating including a wax and a copolymer resin.

The coating may comprise 85%-95% by weight wax and 5%-15% by weight copolymer resin, preferably 92% by weight wax and 8% by weight copolymer resin.

The coating preferably has a congealing point of at least 65°C.

A preferred wax coating of the invention has a needle penetration at 25ºC (1/10mm) of more than 10, typically 13 and a kinematic viscosity at 100ºC (cst) of more than 15, typically 18.

The wax is typically a synthetic paraffin wax, such as a Fischer-Tropsch derived wax.

The copolymer resin is typically an ethylene vinyl acetate resin.

According to a second aspect of the invention there is provided a solid fuel element which is coated with the coating described above. 

The solid fuel element may be a carbonaceous product and is preferably a briquette made of a compressed combustible material, typically compressed charcoal or coal dust.

The solid fuel element may be impregnated with a liquid fuel or accelerants, such as liquid paraffin.

According to a third aspect of the invention there is provided a method of making a solid fuel element, the method including the steps of:

1.                  at least partially immersing a fuel element made from combustible material in a liquid fuel or accelerant so that some of the liquid fuel or accelerant is absorbed by the fuel element to produce a liquid fuel-containing fuel element;  and

2.                  coating or sealing the liquid fuel-containing fuel element with a wax coating.

Step 2 preferably includes a first coating stage wherein the liquid-containing fuel element is coated with a primary coating comprising a mixture of liquid fuel or accelerant and coating wax and a second coating stage where the primary coated liquid-containing fuel element is coated with coating wax.

The coating wax preferably includes a wax and a copolymer resin.

 

BRIEF DESCRIPTION OF THE DRAWINGS

The drawing is a cross-sectional view of a fuel element covered with a coating according to the invention.

DETAILED DESCRIPTION OF THE INVENTION

With reference to the drawing, the numeral 10 indicates generally a coated fuel element of the invention.  The fuel element 10 comprises a body 12 which, in this embodiment of the invention, is a briquette made from compressed charcoal and charcoal dust. ...