Fabrication
What is the main advantage of injection molding?
Ability to make complex parts
Amorphous materials are typically transparent
True
What does "poly""mer" stand for?
Poly = many
Mer = units
Tm stands for what?
Melt temperature
What does TDS stand for?
Technical datasheet
What are the two types of blow molding?
Extrusion & injection blow molding
All polymers are plastic
False - but all plastics are polymers
What are the two types of thermoplastics?
Semi-crystalline & amorphous
What does HDT mean?
Heat deflection temperature
What does HS stand for?
Heat stabilizer
How are plastic pellets made?
Extrusion
PC has a Tm of 140°C
False - Tg of 140°C
Explain the difference between semi-crystalline and amorphous
Semi-crystalline materials have areas of tightly packed crystal regions where amorphous materials are without structure
What does RTI mean?
Relative thermal index
What does PP stand for?
Polypropylene
What are the two clamping unit types for injection molding?
Electric & hydraulic
PA 6/6 has a Tg of 60°C & Tm of 260°C
False - Tm of 260°C and Tg of 60°C
What are the two types of plastics?
Thermoplastic & thermoset
transition
What does LGF stand for?
Long glass fiber
Name 5 of the plastic fabrication processes we covered in class
Injection molding
Extrusion
Thermoforming
Blow molding
Rotational molding
I can compare the melt flow value of ABS to PC
False - because of the difference in shear thinning
What three things determine a plastic's properties?
Chemical composition
Alignment of chains
Shape of chains
RTI testing is across how many hours?
100,000
What does LLDPE stand for?
Linear low density polyethylene