March 14, 2011
To understand why ceramic imprints are permanent and
dishwasher safe we have to first know how ceramics are made and how they are
printed. To make ceramics you need a special kind of clay that has to be
molded into a shape. This shape is then placed into an oven at very high
temperatures where it is cooked for several hours. Then it is left to cool
down gradually so the end product won't be too brittle.
The painting of the ceramics takes place before the ceramics
are cooked, so while the ceramics are still a hardened mixture of clay,
water and several other ingredients that strengthen the final product, a
painter creates a design using a paint that will mix chemically with the
clay at very high temperatures. So, on the final product the ink is
imprinted and is a part of the ceramics and it cannot be washed away, not
even with powerful chemicals or high temperatures. The ceramics are created
to withstand temperature of 1000-3000 degrees Celsius, and the temperature
of your dishware is 100 degrees so it has no affect whatsoever on the
ceramic imprints. This is how the traditional printing is done but new
technologies open the way to many printing techniques.
Today ceramics are printed using modern technologies for most
important printing methods: pad printing, screen printing and heat stamping.
After the process of printing the objects are placed into an oven at very
high temperatures which solidifies the painting onto the surface. For most
daily home applications like oven cooking and dishwashing inside a machine,
the ceramic painting doesn't need to be cooked industrially so they are made
blank and later on a company may chose to print their own ceramics at lower
temperatures of less than 1000 degrees.
As a general idea, paints that are cooked in oven at high
temperature are permanent and can never be washed away, at least not with
water and soap alone.
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