From: Debra Jacobson (email@example.com)
Date: Thu, 02 May 2002 07:41:59
In reply to your 2nd question about gravure cylinders, I am not sure I clearly understand the question as you phrased it, but I will reply as I have interpreted it. Gravure cylinders themselves are not varnished. They are chrome plated. Varnish or other overprint coatings are applied to a substrate (paper, etc) with a gravure cylinder. Varnish is a coating very much like an ink that can either be water based or solvent based depending on the operation. It is commonly used in water based gravure printing operations. Water based varnishes are typically non-hazardous. In terms of discharging non-haz. water based varnish waste to the POTW the BOD of the waste water may be a consideration. Solvent based varnishes my be hazardous due to the flash point of the solvent or it contains a "listed" solvent.
In the case of some solvents used in the printing industry they may be classified by RCRA regulations as an F-Listed hazardous waste. For more guidance on determining if the waste is hazardous a review of the product data sheet or the MSDS and the regulations may be needed. More information about RCRA requirements can be found on the PNEAC web site at http://pneac.org/compliance/Waste-Land or refer to 40 CFR Part 261.