JP2006516472A5 - - Google Patents

Claims (30)

A method of curing an aqueous paint applied as a liquid on a substrate and forming a paint coating on the substrate, the method comprising: (a) bringing the coated substrate to a temperature below the boiling point of water in the paint Heat and hold at that temperature to evaporate some amount of water in the paint from the paint and then boil the paint coating on the substrate after the subsequent curing step (as described in the specification) stage by heating the substrate to a temperature higher than the evaporation temperature of step (a) in the curing step and after (b), to cure the paint; but steps to prevent substantially
Characterized in that it comprises a method for curing the water-based paint.   The method of claim 1, wherein step (a) comprises evaporation of a substantial amount of water in the paint.   The method of claim 1, wherein step (a) comprises evaporation of at least 50 wt% water in the paint.   The method of claim 1, wherein step (a) comprises evaporation of at least 60 wt% water in the paint.   A method according to any one of the preceding claims, wherein step (a) comprises maintaining the temperature at the evaporation temperature for up to 5 seconds.   A method according to any one of the preceding claims, wherein step (a) comprises holding the temperature at the evaporation temperature for 1-5 seconds.   A process according to any one of the preceding claims, wherein the evaporation temperature of step (a) is as close as possible to the boiling point of water in the paint.   A process according to any one of the preceding claims, wherein the evaporation temperature of step (a) is selected to be at least 5 ° C below the boiling point of water in the paint.   A process according to any one of the preceding claims, wherein the evaporation temperature of step (a) is selected to be at least 5-10 ° C below the boiling point of water in the paint.   A method according to any one of the preceding claims, wherein step (a) comprises heating the coated substrate from a low onset temperature to an evaporation temperature. A method according to any one of the preceding claims, wherein step (a) comprises raising the temperature from the start temperature to the evaporation temperature in 2 seconds or less . A method according to any one of the preceding claims, wherein step (a) comprises raising the temperature from the start temperature to the evaporation temperature in 0.5-1.5 seconds.   A method according to any one of the preceding claims, wherein step (a) comprises supplying moving hot air to promote the evaporation of water in the paint.   A method according to any one of the preceding claims, wherein step (b) comprises heating the substrate to an elevated temperature in 6 seconds or less.   A method according to any one of the preceding claims, wherein step (b) comprises heating the substrate to an elevated temperature in 4 seconds or less.   A method according to any one of the preceding claims, wherein step (b) comprises heating the substrate to an elevated temperature in 2 seconds or less.   A method according to any one of the preceding claims, wherein step (b) comprises heating the substrate from the evaporation temperature to a peak metal temperature of 180-260C.   A method according to any one of the preceding claims, wherein step (b) comprises heating the substrate from an evaporation temperature to a peak metal temperature of 190-260C.   A method according to any one of the preceding claims, wherein the paint comprises 25-50% solids volume (polymeric material and pigment) and the remaining liquid, mainly water.   A method according to any one of the preceding claims, comprising heating the substrate in an evaporation stage (a) and a curing stage (b) within 10 seconds.   21. The method of claim 20, comprising heating the substrate in steps (a) and (b) within 8 seconds.   21. The method of claim 20, comprising heating the substrate in steps (a) and (b) within 6 seconds. The coated substrate is performed continuously pass is allowed to evaporate stage evaporation in an oven at evaporation oven (a), curing the paint subsequently the coated substrate with only passes in another curing oven curing oven A method according to any one of the preceding claims comprising:   21. The method of claim 20, comprising heating the coated substrate to an evaporation temperature in an evaporation oven and continuing the evaporation for a time during which the coated substrate moves from the evaporation oven to the curing oven.   21. The method of claim 20, wherein the spacing between ovens and the rate of movement of the substrate between ovens are selected such that there is sufficient time to achieve the required amount of evaporation at the evaporation temperature.   A method according to any one of the preceding claims, wherein the substrate is a steel strip having a zinc or zinc / aluminum alloy coating on the strip. (A) applying a water-based paint as a liquid on the substrate to form a paint coating on the substrate; and (b) curing the paint according to the method of any one of the preceding claims, and A method of forming a coating of paint on a substrate comprising the step of forming a dry paint coating on the substrate. (A) forming a metal film on the substrate;
(B) applying a water-based paint as a liquid on the metal- coated substrate to form a paint coating on the substrate; and (c) curing the paint according to the method of any preceding claim 1-26. And forming a dry paint coating on the substrate,
A method of forming a coating of paint on a substrate comprising the steps of: Suitable for use as starting material in the manufacture of building cladding sheets and other steel metal products for the building industry, having a water-based paint coating cured by the method of any preceding claim Is a metal strip. A paint line for forming a paint coating of a predetermined dry paint coating thickness on a metal-coated strip, the paint line comprising: (a) applying a water-based paint as a liquid on the metal-coated strip and painting on the strip Means for forming a coating; and (b) means for curing a paint according to the method of any one of the preceding claims 1 to 25 to produce a dry paint coating on a metallized strip, Paint line to be.