The trend to finer lines and spaces continues to challenge processors of innerlayer material. With thinner core laminate and thinner copper foil, mechanical cleaning — the cleaning method of choice for years — is no longer an option.
01/30/2013–RBP Chemical Technology Inc., Milwaukee, Wis., a developer, manufacturer and distributor of high performance chemicals and consumable supplies, announced today its asset acquisition of RD Chemical Company, Mountain View, California-based RD Chemical has been supplying application-specific process chemicals for the printed circuit board, chemical milling, medical implant device, and semiconductor packaging and test equipment industries for more than 30 years.
Antifoam is unfortunately a necessary evil for developing and resist stripping spray processes. I say unfortunate because antifoams are typically petroleum- based products that we do not want on the panel.
However, the surfactants which are in the resist are dissolved into the developer or resist stripper bath and must be controlled. If this foaming isn’t controlled, it can lead to not only a mess, but a loss of spray pressure, due to pump cavitation.
Hey Rob, my tin stripper works great most of the time. However, when I run high aspect ratio boards greater than 8:1, I am seeing tin in the hole. What’s wrong?
Toning is the inability to remove fine ink particles that deposit on to the non — image area of the plate.
Bands of ink that form and look like rail road tracks. They appear on the roller train and may transfer and appear in the print. They may appear in rows across the sheet anywhere from the lead edge to the tail edge.
Inability for plates to clean up quickly at startup and restart of press
Ink may appear to be drying out in the roller train or press seems to be unable to adequately supply the proper ink water emulsion to the plate.
Fine lines and dots disappear. Work loses clarity and printing becomes streaky with weak solids and densities. Images disappear.
Plates become sensitive during the run, and will start to transfer ink in the non- image area.
Ink or other material accumulates on the blankets or transfer cylinders on the outside dimensions of the paper stock being run.
Printed solid areas are not uniform or smooth in appearance. Ink density is uneven or light.
Ink is transferring from one page to the next or book to book when completed.
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