John Bingham provides information for,
coating applications and the vital roll the anilox roll plays in this application.
He explains the importance of engraving specifications and how to ensure you have the right specs.
John Bingham with Bingham flexo services.
Bingham Flexo services are the Midwest representatives for Pamarco.
What I want to talk about today is the information that we need from our customers to make an engraving recommendation for a coding application where the customer measures the amount of coding applied by weight per a given area. So what we need to get from our customers is the number of pounds per ream either wet or dry of coding that they want to apply a ream is 3000 square feet. Some customer measures in grams per meter squared. In other other areas as well but we need to make that conversion to pounds per ream.
base rolls for internal use as well a variety of OEM specification cylinders
The second thing is the method of application either direct gravure. Where the coating is being applied directly from the engraved roll to the substrate. Offset gravure or the coating is being applied from the engraved roll to a rubber covered roller and then to the substrate. Or the third one is reverse gravure where the coating is being applied directly from the engraved roll to the substrate but the engraved roll turns in the opposite direction of the substrate. This will affect the transfer rate the transfer rate is the amount of coating on the surface of the engraved roll that actually is deposited on the surface of the substrate. In a direct or application typically 40 to 45 percent. Is transferred from the engraved roll to the surface of the substrate and an offset gravure application generally 20 to 25 percent in a reverse gravure application. It really depends on whether or not there is a rubber nip role backing up the substrate or the substrate just wraps around the engraved roll. Reverse gravure applications can have a widely varied transfer rate but that’s that’s the second thing that we need. The third thing is the percent of solids. You know what is the percent of solids in the in the coating specifically for dry weight applications where customer measures the amount applied in pounds per diem Drive versus what and then the last thing that also influences the transfer rate is the weight per gallon of the coding solution. So those are the four things the pounds per ream the method of application. The percent of solids and then the weight per gallon of the coding solution if that’s available we should be able to help you make a good decision as to what volume is necessary to apply the amount of coding that is desired.