HMA inside
melting
tank is
easy to be
charred or
yellowish
1. Temperature of
roller is too
high.
2. Length of
coating is too
long, causing
much air to be
brought into
melting tank.
3. HMA is poor in
the ability of
anti-oxidizatio
n.
1. Properly adjust temperature
of roller.
2. Please stop running motor
without coating.
3. Change HMA that has better
anti-oxidization.
Materials
rolled
into
melting
tank while
coating
1. Temperature of
roller is not
enough.
2. Materials are
too thin and
soft to be
coated.
1. Adjust temperature of
roller.
2. Select other kind of
applicator to coat HMA on
these soft or thin materials.
