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Flame treatment of a substrate

Inactive Publication Date: 2013-10-24
TETRA LAVAL HLDG & FINANCE SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is about controlling the flame treatment of a substrate to improve adhesion. The method involves monitoring the presence of radical emissions from the flame using a flame analyzer and comparing it with pre-defined data. This data is used to adjust various factors like the mass flow of fuel and air, the angle between the burner and the substrate, and the distance between them. This results in a more efficient use of flame treatment for the substrate. The invention also includes a system for controlling flame treatment of a substrate which includes a burner and flame analyzer.

Problems solved by technology

The adjustment is thus operator dependent and it is not normally easy to visually determine what part of the flame is suitable for placing the substrate.
By visual adjustment repeatability is a problem.
There are drawbacks when arranging the substrate too close to the edge of the inner part (3).
There are also drawbacks in arranging the substrate to far from the part of the flame having the highest temperature.
In either case it is likely that sufficient treatment is not obtained.

Method used

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Embodiment Construction

[0011]There are many factors affecting the flame treatment of a substrate. Some important parameters are gas flow, gas type, fuel mixture (mixture of fuel and oxygen, such as air), the distance between the burner and the substrate, the angle between the burner and the substrate, and the speed of the web substrate. Naturally it is preferred if many of the parameters are kept constant but normally this is not possible due to factors such as clogging of part of the burner nozzle, affecting the gas flow; variations in the fuel mixture; and variation of the line speed (the line transporting the substrate). According to the present invention any fuel and mixture of different compatible fuels may be used, non-limiting examples thereof are natural gas, liquid petroleum gas (LPG) and methane. The fuel mixture is normally a mixture between one or more fuel(s) and oxygen. Air is often used as the oxygen source and the air-fuel ratio is often expressed as percent excess combustion air. As an ex...

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Abstract

The present invention relates to a method and system for controlling flame treatment of a substrate.

Description

TECHNICAL FIELD[0001]The invention generally relates to the field of treatment of a substrate such as a paper, paperboard or carton with a flame.BACKGROUND OF THE INVENTION[0002]The present invention relates to flame treatment of a substrate, such as a paper, paperboard or carton. The substrate is flame treated in order to oxidize its surface to make it more polar. Combustion chemistry involves mixing a fuel and oxygen, for example propane and air and provide ignition. The combustion reaction is in fact not only one reaction but many reactions. The flame contains many reactive species, such as hydroxyl radicals, carbonyl radicals, carboxyl radicals, oxygen atoms and ions etc. The reactive species are used to increase the surface energy of the substrate and improve adhesion. The flame also heats and dries the substrate, which also can improve adhesion to a plastic material. There are many factors affecting the result, for example the mixture of the fuel and air (oxygen). Conventional...

Claims

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Application Information

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IPC IPC(8): F23N5/00
CPCF23N5/003B29C59/08D21H25/04F23N5/082F23N2229/20
Inventor SANDSTROM, ANDERS
Owner TETRA LAVAL HLDG & FINANCE SA
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