[Misc] GR3770 inks drying method

[Guest]

Hello all,
I'm printing with a gr3770 since last year and everything is great but the problem of the never-dried inks, wich is somewhat inherent of the process. It didn't really matter until now, because I've got two new books to print, including their covers and I'd like to avoid sending books that make stains all over the client's hands... I know I'm not the only one with the problem (http://www.copytechnet.com/forums/sh...3750-Risograph), so I'd like to find a technique to resolve it (other than putting a plastic sheet on the cover).

I tried several papers (Munken Print, Munken Lynx, Multidesign), some are better than others but the problem remains.

I was thinking maybe to accelerate the drying process by making a drier with a small electric heater and some pc fans. Do you think that blowing hot air on the prints could make it?
Also, I know that in silkscreen printing, one can use products that, mixed with the inks, accelerate the drying process. It seems a little difficult and maybe not very safe for the riso but maybe injecting a little bit of this product inside the toner cartridge would work... And there is still the solution of spraying fixative on the prints but I'd like to avoid that if possible (not very healthy to empty a bottle of fixative indoor without proper aeration).

Thanks in advance for any thought!

[Iowatech]

Re: GR3770 inks drying method

Maybe try photo mode? Or maybe the dot modes if newspaper quality prints would work?
Sorry, that might just be something that happens with obsolete machines.

[Kev]

Re: GR3770 inks drying method

Hello all,
I'm printing with a gr3770 since last year and everything is great but the problem of the never-dried inks, wich is somewhat inherent of the process. It didn't really matter until now, because I've got two new books to print, including their covers and I'd like to avoid sending books that make stains all over the client's hands... I know I'm not the only one with the problem (http://www.copytechnet.com/forums/sh...3750-Risograph), so I'd like to find a technique to resolve it (other than putting a plastic sheet on the cover).

I tried several papers (Munken Print, Munken Lynx, Multidesign), some are better than others but the problem remains.

I was thinking maybe to accelerate the drying process by making a drier with a small electric heater and some pc fans. Do you think that blowing hot air on the prints could make it?
Also, I know that in silkscreen printing, one can use products that, mixed with the inks, accelerate the drying process. It seems a little difficult and maybe not very safe for the riso but maybe injecting a little bit of this product inside the toner cartridge would work... And there is still the solution of spraying fixative on the prints but I'd like to avoid that if possible (not very healthy to empty a bottle of fixative indoor without proper aeration).

Thanks in advance for any thought!

Not sure if this is any help.I publish a small community newspaper on 2 x GR3770s & have been for about 12 yrs. We average between 600-700 copies of 5 or 6 A3 sized sheets double sided fortnightly. Have just picked up one of the last issue published 4 days ago & couldn't smudge the black ink with my finger or knuckle. We do a two colour front page, and the red does smudge fairly easily. We use photo setting for the black, & line for the colour. have never had a customer, (Whether advertiser or reader) complain about smudging. Which sort of leaves the paper. Being other side of the world, I'm not familiar with the paper you mention. The paper I am using is a standard 'run of the mill' 80gsm laser copy paper. Not for any tech reason, just that it is the cheapest I can find that will run on the machine. Best of luck.

[psykolio]

Re: GR3770 inks drying method

thank you Iowatech and Kev!
I'll have to use both modes for the two books, I got some texts, some images... all in black. But I'm going to print a small magazine in april in two colours also... Interesting that the ink smudge depends on the colour used... Did you ever try something to dry or "fix" the colours other than changing paper or printing mode?

[gillje]

Re: GR3770 inks drying method

Unfortunately heat doesn't aid in drying. I have a conveyor drier in my shop along with my Riso and the same idea crossed my mind. I tried it out and no noticeable difference in how the ink dried.

Your best bets are your choice of paper and using new ink. Older inks don't print as well and don't get absorbed into the paper as well either.

I've seen riso books where the cover is laminated and others where they are overprinted with a clear varnish...

[Kev]

Re: GR3770 inks drying method

thank you Iowatech and Kev!
I'll have to use both modes for the two books, I got some texts, some images... all in black. But I'm going to print a small magazine in april in two colours also... Interesting that the ink smudge depends on the colour used... Did you ever try something to dry or "fix" the colours other than changing paper or printing mode?

May not be simply the colour. The colour run is mainly for our masthead (Logo) which is quite blocky, however the red ink is fairly old, as we don't use much, & I bought a quantity from a business that was going out of these machines, so age could also be an issue. Just tried the surrounding box & some smaller print which doesn't smudge. We are in a newspaper scenario, so don't really have the time during a production run to add fixing or drying processes. Typically we print, assemble, manually insert about 180 into envelopes for mail outs, & get the remainder into the shops in about 8 hours. The cover pages we always print colour first as this is the smaller ink area & less likely to cause skewing or other 'wandering' during the subsequent pass. So we print the colour, about 10% coverage, and straight back to the feed tray & print the black. We don't get any machine smudging during this process. We do get a slight pink stripe during the finishing from a roller on our stand alone booklet maker. Most people don't notice it, but I must try to remember to clean that roller! Tried to put an attachment on so you could see what I'm on about, but not sure if it happened.

[psykolio]

Re: GR3770 inks drying method

ok, thank you, I'll be more careful on the age of ink. I think the paper I got is good for absorbing, I've seen it in several riso publications. I'll just go with it and see what happens.

[LA TECH]

Re: GR3770 inks drying method

Use OEM ink, if using aftermarket or so call generic you'll have so many problem, OEM works better but fresh not expired.

[joelsa12]

Re: GR3770 inks drying method

riso inks have always dried by being absorbed. i beleave the word is imulsification. i bet i murdered that spelling. if your paper is too glossy it will not dry.....ever