It 341 Final Cal Poly

Front 1

shot

Back 1

amount of material injected into a mold

Front 2

Flash

Back 2

The occurrence of molten material seeping out of the mold cavity and solidifying.

Front 3

Regrind

Back 3

refers to scrap material that is reground into pellets and then mixed with unused material for reuse.

Front 4

regrind ratio

Back 4

The regrind ratio is the allowable amount of regrind relative to virgin material.

Front 5

Clamp force

Back 5

The force that is applied to a mold by the molding machine in order to keep it securely closed while the material is injected.

Front 6

four step injection molding process?

Back 6

clamping, injection, cooling, ejection

Front 7

problems of injection molding?

Back 7

insufficient filling, overfilling, high temperature can result in polymer degradation

Front 8

advantages of injection molding?

Back 8

Can form complex shapes and fine details Excellent surface finish, Good dimensional accuracy, High production rate, Low labor cost, Scrap can be recycled

Front 9

disadvantages of injection molding?

Back 9

Limited to thin walled parts
. High tooling and equipment cost . Long lead time possible

Front 10

molten material in extrusion blow molder sits where?

Back 10

accumulator

Front 11

injection blow molding three steps

Back 11

injection, blowing, eject

Front 12

4 steps of injecting stretch molding?

Back 12

injection (resin is heated preform is made), conditioning (preform is warmed or cooled), stretching and blowing (biaxially streteched using pneumatic stress rod and high pressure air), eject