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[Kornit 931] Polyester Drying

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  • 3 Post By mikejmance
  • 1 Post By coriewright1979

 
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Old August 24th, 2016 Aug 24, 2016 3:17:56 PM -   #1 (permalink)
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Default Polyester Drying

Has anybody had any drying issues when it comes to printing on a 100% polyester garment? Currently we are using a M&R Sprint 2000 dryer and either the polyester shirts are coming out either too tacky/sticky or to dry. I cannot find the middle ground. It's getting frustrating as more and more customers are wanting the lighter polyester fabric and the design prints great but it just doesn't dry correctly. Any suggestions will help.

Kornit Storm II & Kornit Storm 931DS

Currently dry settings for dark polyester shirts:
240* @ 6 min; 2 times through the dryer
230* is to tacky, same with 220*

Thanks
Corie Wright
GO USA Inc.
Wenatchee, Washington
 
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Old August 29th, 2016 Aug 29, 2016 10:28:32 AM -   #2 (permalink)
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Default Re: Polyester Drying

Try 275 (fahrenheit) @ 12 minute belt speed.
 
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Old September 1st, 2016 Sep 1, 2016 6:30:10 AM -   #3 (permalink)
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Default Re: Polyester Drying

Quote:
Originally Posted by mikejmance
Try 275 (fahrenheit) @ 12 minute belt speed.
Are you using single white or double white when printing on Polyester? Single white at that temp will crack and I have had the same experience with Double white. Problem I'm running into is the belt speed only goes up to 8 min! Any other suggestions?
 
 
Old September 1st, 2016 Sep 1, 2016 6:51:44 AM -   #4 (permalink)
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Default Re: Polyester Drying

We are using a double base for Nike Pro Combat Speed Jersey Black & White. We have also dealt with cracking in our testing but dialed it back to over fixation of the garment. Once we dialed the fixation back 30% the cracking disappeared. We have been very successful printing on crazy sports apparel.
 
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Old September 1st, 2016 Sep 1, 2016 6:57:05 AM -   #5 (permalink)
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Default Re: Polyester Drying

Quote:
Originally Posted by mikejmance
We are using a double base for Nike Pro Combat Speed Jersey Black & White. We have also dealt with cracking in our testing but dialed it back to over fixation of the garment. Once we dialed the fixation back 30% the cracking disappeared. We have been very successful printing on crazy sports apparel.
What is the amount of fixation you have been using? With the ambient humidity in our dryer room and printing room, 80% fixation seems to work best for us depending on the polyester garment. Since they are all different sometime we have to go up to 90% in order for the design to print correctly. Again, any good suggestions will help!

Thank you

Corie
 
Old September 1st, 2016 Sep 1, 2016 7:02:54 AM -   #6 (permalink)
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Default Re: Polyester Drying

We are right around 80% as well. We were initially spraying twice with fixation once at 80% and then added 30% on the 2nd hit.
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Old September 6th, 2016 Sep 6, 2016 3:26:29 AM -   #7 (permalink)
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Default Re: Polyester Drying

what are the print settings for this one? how much white ?? When i print the polyester color often breaks through white color, but it seem the curing is important for polyester... slower with smaller temp.. ?
 
Old September 26th, 2016 Sep 26, 2016 1:50:30 PM -   #8 (permalink)
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Default Re: Polyester Drying

Quote:
Originally Posted by Raivis
what are the print settings for this one? how much white ?? When i print the polyester color often breaks through white color, but it seem the curing is important for polyester... slower with smaller temp.. ?
Since I have been using the Kornit Storm II, My print settings for poly are:

Highlight: 40%
White under light:70%
White under Dark: 50%

80% - 90% spray (depending on type of polyester)

Our Dryer is the M&R Sprint2000 so I have been drying it at 240 degrees for 12 min and they have been coming out perfect now without any issues. any longer than 12 min and it starts to crack.
 
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Old September 26th, 2016 Sep 26, 2016 10:29:36 PM -   #9 (permalink)
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Default Re: Polyester Drying

Thanks, seems I need to try it out !!!

You put through the dryer several times ?? or you can set the belt speed very slow?
And it's double white layer ?
And the tempereture must be in Farenheit?? <-- Just cheking
 
Old September 27th, 2016 Sep 27, 2016 12:01:35 AM -   #10 (permalink)
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Default Re: Polyester Drying

Thanks, seems I need to try it out !!!

You put through the dryer several times ?? or you can set the belt speed very slow?
And it's double white layer ?
And the tempereture must be in Farenheit?? <-- Just cheking
 
Old September 27th, 2016 Sep 27, 2016 7:01:13 AM -   #11 (permalink)
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Default Re: Polyester Drying

Quote:
Originally Posted by Raivis
Thanks, seems I need to try it out !!!

You put through the dryer several times ?? or you can set the belt speed very slow?
And it's double white layer ?
And the tempereture must be in Farenheit?? <-- Just cheking
Before we print, all polyester goes through the dryer first. This sets any dye's from the manufacturer in the shirt to help eliminate die migration from the shirt to the primary white layer of ink.

We have the dryer set at 6 min and it goes through twice after printing. Our dryer only slows down to 8 min so we have to put it through twice in order to cure properly.

I always run polyester at double white! This insures that you don't get die migration like I mentioned above.

Temperature is in Fahrenheit. But if need be you can convert to Celsius if need be.
 
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Old September 29th, 2016 Sep 29, 2016 9:03:09 AM -   #12 (permalink)
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Default Re: Polyester Drying

Quote:
Originally Posted by mikejmance
We are right around 80% as well. We were initially spraying twice with fixation once at 80% and then added 30% on the 2nd hit.
Mike and Corie, this is a great thread, thank you for sharing. @mikejmance Would you be able to describe what you mean by double fixation hit? Are you doing a spray and wipe at 80%, and then another spray and wipe at 30% immediately after, or what do you mean exactly? Many thanks in advance.

Have been toying with polyester and have not had much luck thus far (on a Breeze 921 with varying printing tests for fixation and underbase, with the Adelco drawer dryer, 295F @ 8:30 - 10:30, and a few other times/temps).
 
Old September 29th, 2016 Sep 29, 2016 12:40:46 PM -   #13 (permalink)
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Default Re: Polyester Drying

Quote:
Originally Posted by NinjaTactics
Mike and Corie, this is a great thread, thank you for sharing. @mikejmance Would you be able to describe what you mean by double fixation hit? Are you doing a spray and wipe at 80%, and then another spray and wipe at 30% immediately after, or what do you mean exactly? Many thanks in advance.

Have been toying with polyester and have not had much luck thus far (on a Breeze 921 with varying printing tests for fixation and underbase, with the Adelco drawer dryer, 295F @ 8:30 - 10:30, and a few other times/temps).
On the Storm II, you have the option to send the garment into spray first before hitting the green buttons and sending it in for a normal print. There are some sweatshirts that I have to use 120% fixation to 130% fixation in order to get the coverage like I need (after drying you will see the ink has dried through the pits of the shirt).

In the QuickP software their is an arrow pointing to the right, next to the stop/pause buttons. I just open that up and if I need to add extra fixation, I can.
 
Old September 22nd, 2018 Sep 22, 2018 4:24:22 AM -   #14 (permalink)
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Default Re: Polyester Drying

How are you stopping the tackiness once cured
 
Old September 28th, 2018 Sep 28, 2018 5:56:42 PM -   #15 (permalink)
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Default Re: Polyester Drying

It's needs to be 280 degrees. The dryer being set to the lowest speed/voltage already going to the motor. You might try switching gears on drive to slow belt more while delivering more voltage to the motor. So, motor can run faster and cool itself better.
 






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