LOL. So...hey, i was just going by the big *** letter i got from Kornit..
its as follows...
From the Desk of Paul Borucki, Kornit N.A.:
As we continue to work with customers each day we are seeing complaints of dull prints, dye migration and fixation burn out. It has become very obvious that all of these customers are over curing their garments. As we make the recommended changes to the customers from our office to change the way they are curing, the results have been dramatic and keep them from "the burn out look".
We have seen customers that have been told to set their dryer at 345 to 360 degrees and that is ruining their chances of success. Once we teach them to reduce the temperature to 300 degrees to 310 degrees on forced air dryers, the colors stay brilliant.
I want to take this time to go over curing digital prints:
The whole issue with electric dryer is scorching of the inks. If you combine too much raw heat without sufficient airflow impingement to the garment surface the inks will dull and burn off too quickly rather than slowly evaporating the water to leave the pigments behind.
Sensitive garments such as polyesters and poly acrylic blends require very low cure temperatures but at extended cure times. Depending on the dryer, conveyor belt or cabinet dryer, the temperature needs to be approximately 250 degrees for 5 to 10 minutes.
Every dryer installation is unique beginning with the power supply. If the owner does not run the proper power to the dryer and read the supply power “at the dryer” all temperature and cure times will be different. A drop in power will mean reduced cure in any electric dryer.
The atmosphere around the dryer directly impacts the cure rates. Hot, dry or cold temperatures in the shop will change the time of cure.
The surrounding equipment in the building or building complex can cause a power draw down will affect the cure specs.
The weight of the garment ( a 6.1 oz t shirt versus a 20 oz sweatshirt) and the saturation of the number of garments that are physically placed on the conveyor belt will change the thermal mass in the dryer and affect cure rates. There will be a difference in the cure of the one off print going down the belt versus a fully loaded dryer.
We always recommend the following
Turn the dryer belt to its slowest setting.
Set the temperature to 310 degrees.
Airflow set at maximum.
Run a shirt through the dryer and check for cure.
smell the garment when it is cool. Check for any vinegar odor
stretch the garment and look for cracking
The prints should be odor free and very stretchable.
Slowly increase belt speed to achieve the most efficient cure rate at that temperature setting.
As the garment weight, the amount of ink on the print and the more wetting solution that is applied, all of these will change your cure specs.
It has come down to one simple factor at several companies, they simply do not have the correct dryer and it needs to be replaced. Color correction or the very bad practice of double color is band aiding the fact that their dryer is not sufficient.
Hehe, "Real Manual" would be a 3000 page flow chart in 8pnt type.that's just it...each day your settings are different!! rainy days... hot days...shirts that are made (same brand - ex. gildan 2000 ) in different countries...require different settings... its a freaking headache... someone should publish the "real manual for this thing"
We have virtually no cure or burn issues with 5500CFM air flow. Too manny people have gone cheap on their dryers after spending big bucks on a machine and they get bad results. You need a gas oven to cure waterbase ink effectively in screen printing or DTG. We use 2 dryer settings- white shirts and dark shirts. Thats it.LOL. So...
We need specific dryer settings for each garment, and different settings if we are running garments fast enough to fill the belt AND different settings for different temp/humidity combos?!?!?!!
Didn't Kornit advertise this friggin machine as EASY! dubbahueteafFFFFFF!
What is next? Do I have to check the phase of the damn moon? No religious holidays? Do not feed after dark? Don't look at it and say bloody mary 3 times? Don't step on a crack or you'll break your kornit's back. Don't hit both green buttons at once. Don't expect an actual workable solution to getting consistent prints from your Kornit!