Screen Print Frequently Asked Questions
What do I use to clean ink from screens?
Check with your supplier or distributor for "Plastisol Screen Wash".
There are several different types, including "environment friendly"
screen wash products. Mineral spirits can be used for general clean
up of squeegees and spatulas. We recommend that you consult your local
city and state regulations for the proper storage and disposal of any
screen wash products.
What is the "shelf life" of your products?
By maintaining proper storage conditions, plastisol inks can have a shelf
life of 2 years or more, depending on the ink product. Two-part inks, such
as nylon inks, once mixed usually have a limited shelf-life. Refer to your
inks' product bulletins. After time, inks should be stirred as separation
can occur.
What does "flash" mean?
"Flash" refers to when a printer heats the surface of an ink
so it is dry to the touch. It also can refer to the actual
"flash cure unit". Flashed inks are not cured inks!
What does "cure" mean?
"Cure" occurs when the entire plastisol ink film fuses
and becomes a single solid entity. For an ink to fuse fully,
the entire film thickness must reach its correct cure temperature.
Can I throw away the inks I use in the trash?
No. Disposing of inks in the trash is not recommended. Check with your local and state regulatory
authorities regarding the proper disposal of ink products. Be responsible!
Improper disposal may result in stiff civil or criminal penalties.
Can I intermix other companies' inks if I need a special color?
It shouldn't be a problem, but we recommend that you first test print then wash test your garment before production.
Although you should be fine in most cases, there may be instances of incompatibility between
different branded products. Keep in mind, it is hard to go back to an ink company for technical
help after you have intermixed different companies' ink products. If you do intermix inks, try
to select inks that have the same cure or fusion temperature.
Why is "off-contact" printing important?
Screen-printing was designed as "off-contact" so that the ink will release
from the screen once the squeegee has passed the desired image area. Without
off-contact, the screen lifts up out of the ink creating an undesirable print
effect.
Are plastisol inks considered hazardous and are they safe to use on children's garments?
Plastisol inks when properly handled and used are considered "non-hazardous".
Lead-free plastisol inks properly applied are considered safe for children's garments.
Some children's sleepwear may require "flame-retardant" inks. Always check the
MSDS (Material Safety Data Sheet) for any product you are going to use.
Are your inks safe to use?
Yes, used properly according to our recommendations, our inks are considered safe.
Always check the MSDS (Material Safety Data Sheet) for any product you are going to use.
How or why should I modify an ink and when?
Knowing how, why, and when to modify an ink comes with experience. Most commonly, printers
modify inks with reducers to bring down viscosity when inks are too thick, or with soft hand
extenders to soften the hand or feel on white or light colored garments. Be sure to follow
the manufacturers' guidelines and USE a scale. Be careful! Over modifying an ink or using
incompatible products will create problems.
Why are there so many different "whites"?
Because it is such a critical color, International Coatings and others formulate specific
white inks to accommodate the wide range of garments and applications printers are likely to
run into. Printers can select white inks based on such factors as bleed, opacity, flash and
cure characteristics, or printability.
What is the best "white" to use?
Unfortunately, there is no simple answer to this question. Ask yourself what you want from
your white ink. Your answer should depend on the garment, art, desired effect, press, dryer,
etc. Then talk with your supplier or ink manufacturer about which white they recommend.
Why is my ink so thick and what can I do or use to thin it?
Plastisol inks can thicken over time, just sitting on the shelf. We recommend that you try
stirring or mixing the ink. This will help break down the "false body" that inks can get after
long periods of storage. If stirring or mixing is not sufficient, use our "Curable Reducer" at
the recommended percentages.
