|WHAT IS NO BAKE ?
When cores and molds are produced without baking
or heating, it is
known as NO BAKE process. Dry sand is mixed with
liquid or powder catalyst and then mixed with binder. This sand mix must
be used as soon as
possible.Otherwise with the passage of time there
will be deterioration in tensile strengthand compaction of sand resulting
in various deffects like
metal penetration, scabbing etc.Work time/ strip
time ratio depends on resin accelerators, temperature of sand, moisture
and humidity. Setting time can
be varied from a few minutes to several hours.
This process reduces, pollution and also saves energy.