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How is graining and anodizing of aluminum litho plates done?

Q. We have a coating unit to manufacture aluminum presensitized printing plates. We import the grained, anodized and post-treated aluminum sheets and then coat them in our plant. We now intend to set up a coil line comprising of graining, anodizing and post-treatment. We'd like to know graining and anodizing for litho plates are done, particularly the materials to be used, the equipment required, etc. We would appreciate any assistance you can provide.

Thanks and regards.

Ashraf Lakhani
Pakistan
1998

A. Having been involved in this type of activity a number of years ago I can give you a few general pointers.

1.) Graining can be accomplished several ways, mechanically by brushing or use of abrasives, or chemically.

2.) Anodizing, can be coil or sheet, will depend on your current coating equipment. Anodic coating thickness may have an effect on subsequent presensitized coating adhesion to the plate and wear factors.

3.) Sealing (or not sealing) is going to be a very important factor with respect to presensitized coating adhesion, and how well non image areas remain hydrophillic (carry water or "fountain solution") while running on a press.

Paul Stransky
- Putnam, Connecticut
1998

RFQ: We are looking for positive coating which can be coated on grained plates. if you know please inform us.

k.j.paul
India
1999

Ed. note: Contact info is no longer available for this outdated RFQ -- sorry. Technical replies are welcome, but no public commercial suggestions please! ( huh? why?). If you want private brand or sourcing suggestions, please post an RFQ.

RFQ: Dear Sirs,

With pleasure we are willing to introduce our self to your esteemed Co., we are a Jordanian Co., dealing and marketing all kinds of printing press materials in H.K.of Jordan and in other countries such as GULF AREA, SYRIA, LEBANON, Etc., and we are interested in your products start with:

1- "ALFA ñ OFFSET POSITIVE PLATES" Size 0400.0510.015 6

2- "OFFSET NEGATIVE PLATES"

We are going to place "trial order" for one container, So please send us your Performa invoice, your terms and conditions, your competitive and rock bottom price to enable us inter and take Good shares from the market.

We are waiting your prompt reply as soon as possible. Best Regards,

Sharif n [last name deleted for privacy by Editor]
- amman-jordan
2000

RFQ: DEAR SIR,

WE ARE LOOKING FOR POSITIVE PLATES, KINDLY CONTACT US IF YOU CAN SUPPLY US.

REGARDS,

VIRAJ PAWANI
- MUSCAT, OMAN
2002

RFQ: Interested in Brush graining machine for offset printing ps plates, can anybody send me address of manufacturer.

Barun Shahi
holographics - Bihar, INDIA
March 3, 2012

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