Be intersting in what you get in reply.
I regard "Plastics Engineer" as the term for some one with a college degree in plastics.
Foreman, General term for first level of supervision. Salaried position.
Molder, General term for experienced machine operator. Hourly Pay
Molding Tech, could be entry level or experienced level for floor personnel Hourly Pay
Molding-Supervisor, could be second management level, supervision more than one Foreman or shift supervision. Salaried position.
Plastics Tech, entry level or specialized experience. Hourly pay.
Plastics Engineer, Entry Level to experienced, Salaried at all levels, may or may not involve supervision of others such as Plastics Techs., Molders, Mold Techs, Processors Even Foreman or Floor Mngrs.
Floor Mngr, second or third plant management level. Salaried position. Maybe college degree required.
Processor, Experienced level & hourly pay.
Any body else want to stir the pot

Dr. Dick
"If you want to soar with the Eagles in the morning.......
You can't hoot with us Owls all night"