Web Coating Blog

Response to Question on “Corona Treatment of metallized CPP film”

                        Response to Question  on “Corona Treatment of metallized CPP film”

                                            Rory Wolf
                                        Enercon Industries Corporation|
                                        rwolf@enerconmail.com

You mentioned that corona treatment of metallized CPP drops from 40 to 37 dynes in 15 days, but corona treatment of un-metallized CPP stays at 40 dynes after the same 15 days.

Comments by Edgar B. Gutoff to Joel DeVito on Bubbles in Slot Die Coating

     First of all, even when the coating solution has no air bubbles, it  contains dissolved air, and this air can come out of solution as bubbles if the air pressure is reduced below atmospheric.  This can occur where the solution velocity is high and therefore the pressure of the solution is low, such as where there may be a constriction in the line as in a valve.  If this occurs, a ow shear valve should help.  A hand-made low shear valve consists of a length of Tygon tubing (perhaps one or two feet long) inside of a length of metal pipe.  When the air pressure is increased inside the metal pipe, the Tygon tubing is compressed and flow inside the tubing is restricted uniformly.

Response to Query on Mayer Rod Coater

                        Response to Query on Mayer Rod Coater
                            Edward Cohen

In response the question on the web coating blog, about sources for mayer rod coater.  The specifications you gave are fairly standard and can be met by several companies.

The following is a list of coater manufacturers who can meet this need:

Response to Question on Laboratory Coater Vendors

Response to Question on Laboratory Coater Vendors
Edward Cohen

IN response the question on the web coating blog, about sources for laboratory coaters. There are several companies that specialize in laboratory coating machines. The contact information is listed below

Response to Query on Measuring Cell Volume of Gravure roll

Response to Query on Measuring Cell Volume of Gravure roll

There are two possible sources for the oil to use with the URMI device:

     Pamarco Global Graphics
    www.pamarcoglobal.com/

    Carolina Roll Engravers
          www.carolinaroll.com/

There is also a supplier who provides a unique one time use test strip that give a very accurate determination of the bcm/volume available on a cylinder. The strips work well on most cylinders. Initially they weren't able to be used on high volume cylinders however they developed a new strip that does. Here is the supplier info:

Cylinder test strips, Capatch at www.capatch.com

Swiss company with representatives in the US.

Sani-Blast in Spring Grove, MN and ESCA in Hatfield, PA