Injection Molding (Test 4) Correctly
Solved
Injection molding - Answer The process in which melted plastic is forced into a mold
where it is shaped and cooled.
-Closures - caps and lids
-Valve and dispenser components
-Margarine tubs, 5 gal. Pails, etc.
-Preforms for injection and stretch-blow-molded bottles
Gate - Answer polymer flows from runner to gate
Runner - Answer used to keep plastic molten polymer flows through runners to gate
sprue - Answer polymer enters here then goes to runner then gate
hot side - Answer polymer injected
cold side - Answer cold side opens and closes to form part
shot - Answer molten plastic that is placed into mold
what are the main parts of an injection molding machine? be able to label a diagram
and describe the functions of the main components. - Answer look at slide 4 and 5
what are the major steps of the injection molding process? - Answer Step
1(plasticizing) - resin is melted
Step 2(injection) - screw moves forward; resin is injected into mold
Step 3(Removal and ejection) - screw withdraws; clamping pressure is released;
mold opens; part drops out
