Unformatted text preview: ME 467
1 1. In injection molding with a reciprocating screw, what is the means by which the raw plastic
material is transported from the hopper entrance to the front of the barrel, where the nozzle is
a. The back-and-forth linear motion of the screw.
b. The screw flutes, pushing the polymer forward due to screw rotation.
c. Direct hydraulic pressure from the pump.
d. Direct pneumatic pressure from the pump.
12. Name one way to increase the stiffness in a product made of thermoplastic material without
changing the material molecular structure or the product shape.
Add Graphite fiber Cor just " Graphite Allowed: Use polymer blend.
13. A "draft" in a molding processes (metal or polymer) is ...
a. A reduction in thickness of a plate
b. Beer served to the casting engineers.
A stiff breeze in the casting shop.
d. The angle of the part sidewalls, with respect to the mold separation direction.
The cross-sectional area of an extrusion die.
Page 5 of 13
View Full Document
- Summer '19