Sublimation depends on three essential variables: time, temperature and pressure exerted. These are responsible within the entire customization process.
These 3 factors change the paints physical state and turn it into steam, expanding and moving in any direction, until it find some resistance or material that will be deposited.
When using very thin paper or without a barrier treatment on one side, this vapor surpasses the paper on the opposite side of the print, transferring ink where you want it, but also depositing ink on the press.
Let's view it:
We performed a simple test to demonstrate what actually happens when sublimating using a lightweight, barrier-free paper:
1. We place the Sulfite paper printed with sublimatic ink on the fabric that would be sublimated.
2. We cover the barrier -free paper with another piece of paper to check for “leaking” to the opposite side.
3. When We opened the press and checked the transfer to both sides: it sublimated the fabric, but it also sublimated the paper used to cover and prevent stains on the press.
This transfer causes stains on the thermal presses and the stained press will embarrass its production.
How to prevent this?
The only way to avoid this problem is to use proper sublimation paper with proper weight and treatment on the back side.
The main one in this case is to present the thicker back, ensuring a barrier to vaporization of the paint. This will prevent it from also evaporating to the opposite side of the print, not allowing the ink to settle on any part of the press.
My press has already stained. How do I clean it?
If your press has already stained, take some fabric and do the pressing procedure (without using paper) and check how much the press will transfer from ink.
After some pressing use a damp cloth (detergent mild may be used) and finish cleaning. Remember that for any cleaning procedure that you need to touch the press, even with cloths, is IMPORTANT that it is FULLY COLD. Handling your press while it is hot can cause serious burns.
I have this problem, but I still have a lot of low quality papers and I need to use them. What to do?
Avoid using this paper for sequential productions as much as possible, but If necessary, a thin sheet of paper may be used between the sublimation paper and the press. This sheet will protect the paper from the press and should be discarded after each press to prevent it from smearing subsequent prints.
Remember that this is a temporary procedure. It only to ensure the production between the purchase and the deliver of the new stock.
Print Press Enjoy!