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Pre=treat issues

 
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Old February 16th, 2013 Feb 16, 2013 9:53:50 AM -   #16 (permalink)
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Default Re: Pre=treat issues

Yes, I do occasionally print white ink on light coloured garments but will always pre-treat as if it were a black garment - i.e. 100% pre-treat and no staining at all.
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Old February 16th, 2013 Feb 16, 2013 3:21:36 PM -   #17 (permalink)
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Default Re: Pre=treat issues

Seeing as I know nothing, but just a thought.. When I had gone on a demo and the pretreat was sprayed on a dark shirt, where there was no print you could see the residew was told it comes out in the first wash ? When I buy a new shirt I want a new shirt (evan though i wash everthing before wearing) still like it to look 100%.. Now my thought on this was to print a full size picture cut it out then spray the pt within the confines of the stencil ( of course it would be slightly larger then the actual print) would just have to figure the registration markings and so forth..Well its just an idea..
 
Old February 16th, 2013 Feb 16, 2013 6:43:12 PM -   #18 (permalink)
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Default Re: Pre=treat issues

i find that most people apply too much pretreat even to black shirts, and when i've had stains, it's been due to too much pretreat. back off a bit on the amount of pretreat applied as a light blue shirt doesn't need the same white intensity as a red or black shirt does. of course, you need to do a wash test. however, i've found that when i apply less pretreat, the washability (new word) is fine, so it's just a matter of how solid your white is. in other words, if it looks good after the print, then it will probably wash just fine...again assuming that you used LESS pretreat as compared to normal.

there is some confusion in the pretreat realm as AnaJet recommends cutting their pretreat 50/50 with distilled water and AA as well as others recommend using theirs full strength. i have heard that some manufacturers cut their pretreat PRIOR to shipping to us printers and other don't, so that may account for why there are different recommendations. it's been long thought that AnaJet relables DuPont ink (they will NOT discuss this subject), and i first had an AnaJet prior to my NeoFlex so i've used inks from both places. i can't tell a difference when looked at side-by-side. of course, i'm just an end-user with ZERO "real" info as to how the manufacturers handle things.
 
 
Old February 17th, 2013 Feb 17, 2013 10:22:29 AM -   #19 (permalink)
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Default Re: Pre=treat issues

I sell them whatever print they want, just working out a few bugs. I've just tested pre-treating one day, air drying over night. Then will hover for about 15 seconds the next day then press for about 15 to 20. Trying to remove the moisture first before flattening out the fibers for a better print. Will let you know how that works.
 
Old February 17th, 2013 Feb 17, 2013 1:03:10 PM -   #20 (permalink)
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Default Re: Pre=treat issues

Quote:
Originally Posted by billmatthis
I sell them whatever print they want, just working out a few bugs. I've just tested pre-treating one day, air drying over night. Then will hover for about 15 seconds the next day then press for about 15 to 20. Trying to remove the moisture first before flattening out the fibers for a better print. Will let you know how that works.
There are a few points to remember when pre treating or modifying the strength of the solution for light colours.

Dark pre treatment is designed to work with white ink, it may make CMYK brighter on white shirts but it is not designed for this. Using dark pre treatment with CMYK 100% or diluted will seriously affect durability in the wash regardless of ink brand.

All shirts sprayed with dark pre treatment stain in some way, it is not visible on most colours and depends on how much is put down.

Some manufacturers make a specific pre treatment that is designed to fix white & CMYK ink to light colours that does not leave a stain. You cannot use this on dark or black shirts as it does not stop the white enough but is sufficient on a light / white shirt. Light shirt pre treatment is a different formula to dark and is in no way the same as dark when diluted.

I am also a firm believer that if it works for you stick with it, the first port of call after getting a good print to cure if you do dilute prevtreatment is the washing machine.

Temperature can also play a big part in light shirt curing, the normal curing temp for white ink is 165c for two to three minutes. A white shirt will singe at 165c even with light or no PT applied. As long as you perform your own wash tests dropping the temp by ten degrees to 155c will normally make a lot of difference.

Hope the helps.
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Old February 18th, 2013 Feb 18, 2013 1:20:14 AM -   #21 (permalink)
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Default Re: Pre=treat issues

That did help some.
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Old February 18th, 2013 Feb 18, 2013 10:08:26 AM -   #22 (permalink)
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Default Re: Pre=treat issues

I have always used pretreatment on white shirts. But I use one for polyester! I have used the dupont for light colored shirts. It does make the colors brighter and for me it improves washability. If you want to use white ink on lights dupont makes a version for this as well.

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Old February 18th, 2013 Feb 18, 2013 2:46:07 PM -   #23 (permalink)
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Default Re: Pre=treat issues

spiderx1 - where do you buy your pt for white/lights and poly?
 
Old February 18th, 2013 Feb 18, 2013 9:44:54 PM -   #24 (permalink)
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Default Re: Pre=treat issues

Quote:
Originally Posted by spiderx1
I have always used pretreatment on white shirts. But I use one for polyester! I have used the dupont for light colored shirts. It does make the colors brighter and for me it improves washability. If you want to use white ink on lights dupont makes a version for this as well.

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Randy, i tryed to use deluted pretreat for dark when printing on white tees without white inks but get very bad washability. U gets improved washability with poly preatreat and with preatreat for light colored shirts? After my test i get to the point that preatret for whites is always bad washability because we dont use white inks.
 
Old February 19th, 2013 Feb 19, 2013 3:25:28 AM -   #25 (permalink)
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Default Re: Pre=treat issues

The polyester is from DTG pretreat. Com. It is clear. The other is standard Dupont pretreat for white or light shirts without white ink. I do not dilute dark shirt pretreat.
Amount sprayed on is about half that for. Dark shirt.
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Old February 19th, 2013 Feb 19, 2013 3:38:55 AM -   #26 (permalink)
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Default Re: Pre=treat issues

Where u going now?
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Old February 19th, 2013 Feb 19, 2013 4:49:11 AM -   #27 (permalink)
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Default Re: Pre=treat issues

safe travels Peter
 
Old February 19th, 2013 Feb 19, 2013 12:57:28 PM -   #28 (permalink)
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Default Re: Pre=treat issues

i too had poor washability when using the light pretreat, but it was because i was using too much. i use about 1/4 of the amount of light pretreat as compared to the dark pretreat. just a light misting is all you need.

do several tests with differing amounts of pretreat until you find your sweet spot.
 
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Old February 19th, 2013 Feb 19, 2013 2:17:58 PM -   #29 (permalink)
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Default Re: Pre=treat issues

OK....
Today I had to print 100 light blue shirts. I listened to John (Stitch-up) And Sean (23Spiderman). I didn't dilute my pretreat. I used it at 100% but, cut the application way down.
I have to say, I found that I am guilty of using way, way too much pretreat. I used about half as much as I normally do with NO PRETREAT STAINS AT ALL.
Thank you to both of you for the great information. The prints looked steller. I've always had trouble with the light shirts. Now, I think I got it...
Again thanks for letting me grill you John.
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