Printreg Archive
Re: Methylene Chloride & printers


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From: gjonesprinting@aol.com
Date: Thu Jul 10 1997 - 08:12:59 CDT


Dave:

In response to your question regarding the use of methylene chloride in
lithography, I have found it used in several different products. It can be
found in:

1) Blanket and roller wash - This includes a wide varity of cleaning
solutions including metering roller cleaners.

2) Copper plating solution - This is used to place a thin layer of copper on
carbon steel rollers in the inking train. The carbon steel rollers are
principally used to distribute the ink evenly into the inking train. They
will become desensitzed due to the fountain solution and repel the ink. The
copper plating makes the rollers more ink receptive.

3) Blanket Fix - There are several different names for this type of product,
but it is used to temporary restore a blanket's thickness after a "smash". A
smash occurs when the thickness of the substrate exceeds the thickness of the
printing nip and since the blanket is the only material that is compressible
the substrate causes the blanket to become permanently indented or damaged.
Examples of smashing occur when a folded corner or two sheets are fed
simultaneously through the press. The blanket fix will swell the blanket back
to original size until the job is finished and the blanket is either replaced
or repacked.

Call or e-mail with questions.

Gary Jones

 


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