Method of controlling thickness of coated film on web-like member by roll coater
AssigneeKawasaki Steel Corporation
InventorsIchiro Tanokuchi, Takao Ikenaga
Life of this patent
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Abstract
A paint in a paint pan is picked up through a gap h.sub.PA formed between a pickup roll and an applicator roll, part of the paint is attached to the applicator roll and delivered to a sheet as a supply flow rate q.sub.A. The film thickness coated on the sheet is controlled in accordance with a model equation: M={(q.sub.A -q.sub.L).multidot..gamma..multidot.C}/LS which has evaluated a difference between the supply flow rate q.sub.A and a leak flow rate q.sub.L not transferred onto the sheet, remaining on the applicator roll and escaping through a gap h.sub.AS (.gamma. is the specific gravity of the paint, C the concentration of a solid content of the paint and LS a moving speed of the sheet).
Claims15
A method of controlling thickness of a coated film of paint on a continuously moving sheet member, the paint being transferred and coated on the sheet member by a roll coater comprising a pickup roll and an applicator roll, at least a surface of the applicator roll being formed of an elastic material, the method comprising the steps of:
- determining a distance between the pickup roll and the applicator roll;
- determining a rotating speed of the pickup roll and a rotating speed of the applicator roll;
- determining a total flow rate in accordance with the determined distance between the pickup roll and the applicator roll and the determined rotating speed of the pickup roll and the rotating speed of the applicator roll;
- determining a supply flow rate of paint delivered to the sheet member by rotation of the applicator roll in accordance with the determination of the total flow rate;
- determining a distance between the applicator roll and the sheet member;
- determining a leak flow rate in accordance with the determined rotating speed of the applicator roll and the distance between the applicator roll and the sheet member;
- and
- controlling the thickness of the coated film of paint in accordance with the determination of the supply flow rate and the determination of the leak flow rate.
A method of controlling thickness of a coated film of paint on a connecting portion of a first continuously moving sheet member in a suspended state and a second continuously moving sheet member in a suspended state, the paint being transferred and coated on the connecting portion by a pickup roll and an applicator roll, the method comprising the steps of:
- determining a tension of the first sheet member;
- determining a tension of the second sheet member;
- and
- controlling the thickness of the coated film of paint in accordance with the determination of the tension of the first and second sheet members.
Dependencies are inferred from the claim text.