Curing Inks On T-Shirts With A Textile Conveyor Dryer

T-Shirts Are Cured Not Dried

A common question we are asked is "how do the inks dry?" Actually, the term screen printers use is 'cure'. In most cases, we use plastisol inks, which will not dry with air. Plastisol is a suspension of PVC particles in a liquid plasticizer, with a consistency of toothpaste. Heat is required to cure the ink. The printed t-shirts are laid on a conveyor textile oven, which has a heat chamber set to 900-950 degrees. Only 320-350 degrees is actually necessary to cure the ink, but the dryer temperature is intentionally set high to speed up the process. T-shirts will exit the dryer within 1-2 minutes fully cured (dry).

The reason we use the term cure (not dry) is because the heat melts the ink, in essence a liquid vinyl, and upon cooling it becomes a solid sheet on vinyl that bonds to the t-shirt fabric. The t-shirts are immediately stacked, having cooled off enough as they exit the dryer. They are then folded into dozens, aka printers fold, and packed in boxes for shipping.

The entire process, with exception of setting up the press, is actually quite fast. In a typical hour, we can print, cure and pack 500 printed t-shirts.

Avoiding Cracked Prints and Ink Washout

Undercured Ink Plastisol T-Shirt Ink Cracking

If you have ever experienced imprints that crack after washing or worse yet, ink that actually washes off the shirt, then you know what happens when inks are not properly cured. Simply running t-shirts through a hot oven is not enough. A common problem is partial or surface cure, where the inks feel dry to the touch, but are not cured throughout the entire ink layer. Because only 320 degrees is needed to cure the ink and super heated drying chambers are used, printers often make the mistake of not curing the ink completely.

So those cracked prints you may have seen, were only cured on the surface, with the inner layer of the ink never reaching full curing temperature. To control this, the curing system must be monitored with a variety of steps. These steps include testing time & temperature variables to set production standards, periodic wash testing, heat measurement as shirts exit the dryer, and stretch testing.

Tip: If you happen to receive a bad batch of shirts, you can return them to your printer to have them fixed, as curing the ink can be redone.

Family Reunion T-Shirt

Family Reunions Are Perfect for Group Orders

We print a lot of family reunion t-shirts. For our customers, it can be a lot of work because they have to tabulate all the sizes for their family members. That's a lot of work for a large family and can be prone to mistakes. Wouldn't it be easier if all your family members ordered their own shirts? Think about it; they enter the sizes they want, then pay for their order. Done. 

About Group Orders

Just like setting up a fundraiser at our site FundraiserTee, you can create a group t-shirt order form. Pick a shirt, upload or create a design, set a price and launch. You get a unique sales page that you send to your family members by Facebook and email. You set a time frame to order and when the ordering is complete, we print the shirts and send them out. You decide if they should be mailed individually to family members or shipped in bulk to one location free of charge.

If you are not comfortable doing it yourself, have FundraiserTee do it for you.

No Upfront Costs

Not only does an online group order form make it easier on you the organizer, but you don't have to collect money either. In fact, you pay nothing to get the order started. Your family members pay for their own shirts when they order online.

Learn more about Group T-Shirt Orders