Theo wrote:

I'm trying to find the name for a type of kitchen cupboard door.

They're made of chipboard, but then have a plastic surface moulded around
them - as if the chipboard has been put in a mould and surrounded in molten
plastic (Not sure what type. PE? PP? ABS?). The result is a door that
has a full continuous plastic coating - even inside - which ends up very
sturdy.

Can anyone suggest what this technique might be called?

I don't know, but the kitchen here seems to be of that type. The hinges
are the only thing with a brand name on that I can see: "Blum".

Maybe this one isn't as impressive as the one you're speaking of; the
plastic is lifting off from the chipboard below in many places.

Daniele