Fixing particle board, sorta...

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If I understand, the problem is that the particle
board strips out - nothing new there! Your best
bet is to put a backing behind the particle board
that WILL hold a screw. This could be a metal
plate, or a 1/2 inch thick piece of hardwood.
Don't try to get by with whitewood, OSB, etc.
You might get away with 5/8 or thicker plywood.
It needs to be something that will allow
you to really tighten the screw, because you will
be relying on the hardware and the backing to
'squeeze' the particle board to hold. Otherwise,
you'll put torque on the screw where it goes
through the backing, and either strip the backing
or break the screw, and in the meantime the door
won't open and close smoothly. You could help a
little with this movement by finding some tubing
or something that would make a bushing between the
screw and the particle board.

If you can use a bolt instead of a screw, there
are inserts that can go in from the back of the
hole, with prongs that will seat in the particle
board and keep the insert from spinning; but if
the screw-head shows from the front, or if it
doesn't allow much clearance, it's not too
likely that this will be an acceptable solution
for you. These inserts will be in the 'furniture
building/repair' section of your local home
improvement store.

Remember, though, there's no such thing as a
'permanent repair' to particle board. The stuff
really should be illegal, especially for any
application that requires holding a screw.

Good luck!