AN IMPROVED, CONTINUOUS COATING LINE AND A PROCESS OF CONTINUOUSLY COATING METAL STRIP

摘要

Essentially, the invention is related to the treatment of strip tension dynamics to values never before employed on horizontal oven specifically the highly sensitive near infrared/infrared radiation/ induction heated curing oven device or near infra red/ ultra-violet radiotion curing oven of solvent-based paints/ water based paints/ powder coatings with a capability to attain curing temperature measured as peak metal temperature for the finish needs in a time of two to three seconds. It is yet another object of invention to maintain horizontal pass line and path of strip travel, paint coated strip on one side and two side coatings with the horizontal oven orientation, either horizontal configuration or with calculated slope in the direction of strip travel and/or mounting the oven with such mechanical gadgets and position transducers to swing or tilt the horizontal oven complete with its heating source towards the operating side direction or drive side direction to liquidate any catenary sag of the strip inside the oven presenting the strip surface to receive the optimum radiation heat from source both top and bottom surface of strip surface including strip edges to achieve uniformity of radiation heat for allowing the required PMT in two to three seconds commensurate with the high speed of the line without any limit to the strip propelling speed and more significantly the need of only normal application of pressure of applicator rolls on to the strip at high strip process speeds to low process speed range per se no limitation on line speed hitherto not achieved. Finally, yet another object in the application of judicious mixing of heave thinners in proper ration to the NIR formulated paints to provide the best quality of coated surface at top speed with short curing times int the range of 1.5 to 3.0 seconds to avoid cracking, edge blisters, surface roughness etc.