Author Topic: URGENT...Printing on Polypropylene Bags  (Read 7413 times)

Offline Parker 1

  • Sr. Member
  • ****
  • Posts: 473
URGENT...Printing on Polypropylene Bags
« on: April 04, 2013, 05:37:01 PM »
I need to print an order of Polypropylene Bags Tomorrow.
I need a ink that will cure at very low Temps (under 270).


Offline brandon

  • Gonzo Member
  • ******
  • Posts: 1709
Re: URGENT...Printing on Polypropylene Bags
« Reply #1 on: April 04, 2013, 05:54:45 PM »
There is a catalyst for plastisol inks that will help you out. But be careful and test first. I am sure all of the ink companies make the same thing. Sorry, at home with a root canal. Ugh...

Offline ericheartsu

  • Gonzo Member
  • ******
  • Posts: 3539
Re: URGENT...Printing on Polypropylene Bags
« Reply #2 on: April 04, 2013, 06:12:47 PM »
we added the catalyst, and still had our belt speed super high
Night Owls
Waterbased screen printing and promo products.
www.nightowlsprint.com 281.741.7285

Offline blue moon

  • Administrator
  • Ludicrous Speed Member
  • *****
  • Posts: 6366
Re: URGENT...Printing on Polypropylene Bags
« Reply #3 on: April 04, 2013, 07:48:36 PM »
I need to print an order of Polypropylene Bags Tomorrow.
I need a ink that will cure at very low Temps (under 270).

add nylonbond and run them just enough to be flashed. NB will make them solidify on their own over few days. You might get away with 250 or so this way.

pierre
Yes, we've won our share of awards, and yes, I've tested stuff and read the scientific papers, but ultimately take everything I say with more than just a grain of salt! So if you are looking for trouble, just do as I say or even better, do something I said years ago!

Offline Inkworks

  • !!!
  • Gonzo Member
  • ******
  • Posts: 1761
  • Pad&Screenprinter
Re: URGENT...Printing on Polypropylene Bags
« Reply #4 on: April 04, 2013, 08:53:54 PM »
Some companies have a low-temp plastisol that works fine out of the bucket, but it can be pricey. Failing that, nylon additive as some have mentioned.
Wishin' I was Fishin'

Offline ScreenFoo

  • Gonzo Member
  • ******
  • Posts: 1296
  • Semper Fidelis Tyrannosaurus
Re: URGENT...Printing on Polypropylene Bags
« Reply #5 on: April 04, 2013, 09:47:29 PM »
Got lucky last week--did 600, catalyzed ink as mentioned, turned down the heat till the chamber was around 320, and ran them through rather slow.

I'd be rather interested in hearing from anyone who reps the companies that make these.  There are several types of PP manufactured, and the melting points range from 266-340F.  I've gotten bags that started balling up well under 300F.


Offline JBLUE

  • !!!
  • Gonzo Member
  • ******
  • Posts: 2036
Re: URGENT...Printing on Polypropylene Bags
« Reply #6 on: April 04, 2013, 09:57:52 PM »
Wilflex performance. Cures at 280. That is what I use. Spendy but so is replacing F'd up bags.
www.inkwerksspd.com

We are all born ignorant, but one must work hard to remain stupid...... Ben Franklin

Offline 3Deep

  • !!!
  • Ludicrous Speed Member
  • *******
  • Posts: 5323
Re: URGENT...Printing on Polypropylene Bags
« Reply #7 on: April 04, 2013, 10:58:47 PM »
We run regular plastisol one nice stroke and off to the dryer, I speed the belt up just enough the bags are hot and the ink is cured...I look at these bags as a one time thing no washing just grab an go, we print them for a doctors office every other month.

Darryl
Life is like Kool-Aid, gotta add sugar/hardwork to make it sweet!!

Offline Inkworks

  • !!!
  • Gonzo Member
  • ******
  • Posts: 1761
  • Pad&Screenprinter
Re: URGENT...Printing on Polypropylene Bags
« Reply #8 on: April 05, 2013, 12:47:35 AM »
Got lucky last week--did 600, catalyzed ink as mentioned, turned down the heat till the chamber was around 320, and ran them through rather slow.

I'd be rather interested in hearing from anyone who reps the companies that make these.  There are several types of PP manufactured, and the melting points range from 266-340F.  I've gotten bags that started balling up well under 300F.

the bags I've done go through at about 260-280 for about 1 minute dwell. 320 would shrivel them down to almost nothing.
Wishin' I was Fishin'

Offline abchung

  • !!!
  • Sr. Member
  • ****
  • Posts: 481
Re: URGENT...Printing on Polypropylene Bags
« Reply #9 on: April 05, 2013, 06:39:18 AM »
For synthetic printing, we use Sericol Nylobag.
To speed up the drying, we just flash at low temp.
Just be careful when stacking because the ink can still be wet in the inside.

http://www.fujifilmsericol.co.uk/ff/pi_sheets/PIforWEB23_5_00/Nylobag%20NB.pdf

Offline tonypep

  • Ludicrous Speed Member
  • *******
  • Posts: 5679
Re: URGENT...Printing on Polypropylene Bags
« Reply #10 on: April 05, 2013, 07:40:47 AM »
We always keep a LCA (low cure additive) for this. Reduce dryer temp by 100 degrees. Does'nt have a pot life

Offline mk162

  • Ludicrous Speed Member
  • *******
  • Posts: 7856
Re: URGENT...Printing on Polypropylene Bags
« Reply #11 on: April 05, 2013, 07:45:32 AM »
tony, who's low cure additive do you use?  I am not sure I've seen it at my regular ink supplier.

Offline tonypep

  • Ludicrous Speed Member
  • *******
  • Posts: 5679
Re: URGENT...Printing on Polypropylene Bags
« Reply #12 on: April 05, 2013, 08:33:28 AM »
Excalibur LCA PF (Phthalate Free) from the Lancer group. Tell my friend Brannon to stock it. Its a well kept secret for some reason.

Offline ScreenFoo

  • Gonzo Member
  • ******
  • Posts: 1296
  • Semper Fidelis Tyrannosaurus
Re: URGENT...Printing on Polypropylene Bags
« Reply #13 on: April 05, 2013, 11:28:18 AM »
Got lucky last week--did 600, catalyzed ink as mentioned, turned down the heat till the chamber was around 320, and ran them through rather slow.

I'd be rather interested in hearing from anyone who reps the companies that make these.  There are several types of PP manufactured, and the melting points range from 266-340F.  I've gotten bags that started balling up well under 300F.

the bags I've done go through at about 260-280 for about 1 minute dwell. 320 would shrivel them down to almost nothing.

Chambers at 320--bags got right around 300--had to hit 320 before they puckered around the print.  Good bags, got lucky.
Had an order last year I could not do anything with.  Even at 250 they started to pucker.  The quality of the polypropylene, and how it's manufactured directly affects it's melting point, I can tell you that much.

Anthony:  Great tip, that nylobag looks like the ticket from the spec sheet. 

Offline royster13

  • !!!
  • Gonzo Member
  • ******
  • Posts: 1975
Re: URGENT...Printing on Polypropylene Bags
« Reply #14 on: April 05, 2013, 12:33:48 PM »
I think most ASI suppliers print these bags with air dry inks......Maybe the Nazdar folks can chime in on this subject...
« Last Edit: April 05, 2013, 12:55:08 PM by royster13 »