Coater
AssigneeOy Wartsila Ab
InventorsRaimo Tuhkanen, Markku Grasten, Sivert Westergard
Life of this patent
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Abstract
An appliance for a double-sided coating of a moving web by means of two coating substance applicators and a smoothing nip comprising a back-up roll on one side of the web and a adjustable levelling blade or the like on the other side of the web. The coating substance is supplied on the web directly on the side facing the levelling blade and on the surface of the back-up roll or the web on the other side of the web. The smoothing nip and the both applicators are located within a 30 degrees sector of the back-up roll, preferably within a 20 degrees sector.
Claims20
An appliance for a double-sided coating of a moving web,
- for instance a paper or a cardboard web, comprising in combination:
- means for advancing the web in a direction from below upwards;
- a first and a second applying station for applying a coating substance to respective moving surfaces;
- a smoothing nip for the final evening-out of the coating, which nip is located separately after the applying stations in the moving direction of the web, said nip comprising an adjustable levelling blade or bar on one side of the web and a rotatable back-up roll on the other side of the web;
- said first applying station including a first applicator, located between the web and said back-up roll, said first applicator being mountable and adjustable into first and second positions for applying coating substance selectively to the moving surface of either said back-up roll or the web;
- said second applying station including a second applicator, located on the web side facing said levelling blade, for applying coating substance directly on the web.
An appliance for double-sided coating of a running web, comprising a rotatable back-up roll, a levelling member which cooperates with the roll to define a smoothing nip, first and second coating substance applicators positioned below the smoothing nip and spaced apart therefrom along a path of movement of the web, the first applicator being located between the back-up roll and the path of movement of the web and being adjustable between a first condition in which it is disposed for applying coating substance to the moving surface of the back-up roll and a second condition in which it is disposed for applying coating substance to the web, and the second applicator being disposed for applying coating substance directly to the side of the web facing the levelling member.
An appliance for coating at least one side of a running web, comprising a rotatable back-up roll, a levelling member which cooperates with the roll to define a smoothing nip, and a coating substance applicator positioned below the smoothing nip and spaced apart therefrom along a path of movement of the web and adjustable between a first condition in which it is disposed for applying coating substance to the moving surface of the back-up roll and a second condition in which it is disposed for applying coating substance to the web.
A method of coating running lengths of web material, for instance webs of paper or cardboard, using an appliance comprising a rotatable back-up roll, a levelling member which cooperates with the roll to define a smoothing nip, and a coating substance applicator positioned below the smoothing nip and spaced apart therefrom along a predetermined path of movement, the applicator being located between the back-up roll and said path of movement and being adjustable between a first condition in which it is disposed for applying coating substance to the moving surface of the back-up roll and a second condition in which it is disposed for applying coating substance to a length of web material being advanced along said path of movement, said method comprising advancing a first length of web material upwardly along said path of movement while said coating substance applicator is in said first condition, delivering coating substance to the coating substance applicator, whereby coating substance is applied to the moving surface of the back-up roll and is transferred to the first length of web material, adjusting the coating substance applicator to its second condition, advancing a second length of web material upwardly along said path of movement, and delivering coating substance to the coating substance applicator, whereby coating substance is applied directly to the web.
Dependencies are inferred from the claim text.