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screen printing => Ink and Chemicals => Topic started by: Itsa Little CrOoked on May 28, 2015, 06:47:08 PM

Title: Nazdar NB72 Catalyst in Plastisol for Non-Woven Polypropylene Totes???
Post by: Itsa Little CrOoked on May 28, 2015, 06:47:08 PM

I remember reading a thread but I can't seem to find it. 

I did a run this morning with IC's Catalyst 900 in black plastisol on lime green totes and it seemed to work okay @ 300º.

But I ran out of catalyst, and I can't get it in before Monday. I have another batch for a different custy in WHITE ink tomorrow.

Does anybody use NB72 as a plastisol catalyst to aid adhesion to polypropylene cinch bags?  Cure temp?

Thanks!

Stan

Title: BUMP Nazdar NB72 Catalyst in Plastisol for Non-Woven Polypropylene Totes???
Post by: Itsa Little CrOoked on May 29, 2015, 08:37:01 AM

Let's try just one BUMP.

I know a shop that uses this for Nylon, even though it was developed for Nazdar's flatstock inks, like 9700 series which I used years ago.

Here's a link to their PDF on the subject.

https://sourceone.nazdar.com/portals/0/tds/Nazdar-NB72.pdf (https://sourceone.nazdar.com/portals/0/tds/Nazdar-NB72.pdf)

Title: Re: Nazdar NB72 Catalyst in Plastisol for Non-Woven Polypropylene Totes???
Post by: Rocky Bihl on May 29, 2015, 09:01:29 AM

Non-Woven Polypropylene Bags are not difficult to get plastisol inks to stick to if the ink film is fully cured. When you add nylon catalyst to regular cure temp plastisol inks, you can reduce your oven temp. down to 300F or so, and even if the ink film is not fully cured, the catalyst will continue to cross link to the nylon, polyprolylene bag, or any other temperature sensitive material and eventually fully cure in a few days. True low cure plastisol inks like our ELT Series that cure all the way down in the 250-260F range and can be printed straight out of the can on these polypropylene bags without any cure or adhesion issues. As for the Nazdar NB72, I have never sampled that particular catalyst, but I would think it would perform the same as the IC Catalyst for this application.

Title: FOLLOW UP: Nazdar NB72 Catalyst in Plastisol for Non-Woven Polypropylene Totes
Post by: Itsa Little CrOoked on June 01, 2015, 02:39:37 PM

Just a quick follow up.

I printed the job and the red totes were fine, with the target temp @ 300º.

All the totes seemed to adhere to the ink, which was Wilflex Quick White with 10% of the NB72 added by weight.

BUT the Black Totes didn't like the 300º as measured with an Infrared Thermometer. I anticipated that, (black. duh.) but even turning the temp down where they read about 275º, they wrinkled. 265 was even slightly disruptive to the BLACK material only.

About half the black bags ended up with some minor damage which didn't seem to matter to the custy. We pointed it out to disinterested shrugs.

I am awating some extra low temp white from One Stroke, which oughta make for a better result, next time....