100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
IET 365 Exam 2 || Already Graded A+. $11.29   Add to cart

Exam (elaborations)

IET 365 Exam 2 || Already Graded A+.

 5 views  0 purchase
  • Course
  • IET 365
  • Institution
  • IET 365

________ or ________ must be present to be classified as a molding process. correct answers Pressure, Force What is compression molding? correct answers A molding compound is placed in an open mold cavity, the mold is closed, and then heat and pressure are applied until the material has cured/co...

[Show more]

Preview 2 out of 9  pages

  • August 4, 2024
  • 9
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • IET 365
  • IET 365
avatar-seller
FullyFocus
IET 365 Exam 2 || Already Graded A+.
________ or ________ must be present to be classified as a molding process. correct answers
Pressure, Force

What is compression molding? correct answers A molding compound is placed in an open mold
cavity, the mold is closed, and then heat and pressure are applied until the material has
cured/cooled.

What is a key word for thermoset? correct answers Cured

What is the general rule-of-thumb for amount of pressure used in compression molding? correct
answers 2900 psi for plastics up to 1" thick, add 725 psi for every additional 1" thick of plastic

When possible use what kind of molds? correct answers Vented

What are the type of plastic(s) used for compression molding? correct answers Thermoset

Bulk Molding Compound (BMC) correct answers polyester base with fillers, resins, hardening
agents, plus other additives

What are the advantages of compression molding? correct answers 1. little waste
2. low tooling costs
3. automated or hand-operated
4. parts are true and round
5. material flow is short (less product stress)
6. multiple cavity placement not dependent on a balanced feeder system
7. cheaper than injection molding to produce higher quality short-run parts

What are the disadvantages of compression molding? correct answers 1. hard to mold complex
parts
2. inserts/ejector pins are easily damaged
3. complex shapes are hard to achieve
4. long molding cycles may be needed
5. unacceptable parts can not be reprocessed
6. trimming flash can be difficult
7. molds must be high quality steel (difficult to machine)

How to increase productivity or decrease cycle time in compression molding? correct answers 1.
pre-heat plastic
2. pre-heat molds
3. use steel molds
4. use screw extruders
5. use higher temperatures
6. use automation

, What are product examples of compression molding? correct answers automotive body panels,
distributor caps, bath tubs, dinnerware, buttons, buckles, knobs, handles, appliance housing,
radio cases, large containers

What is injection molding? correct answers A heat-softened plastic is forced from a cylinder into
a relatively cool cavity giving the item the desired shape

What are two types of injection molding? correct answers (plunger, piston, ram) and
reciprocating screw

What type of injection molder was used in lab? correct answers Reciprocating screw

What are the three zones of a reciprocating screw injection molder? correct answers 1. Feed (1/2)
2. Transition/Compression (1/4)
3. Metering (1/4)

What zone does the most plastic melt? correct answers Transition/Compression

What are the two units of an injection molder? correct answers Injection and Clamp

What is shot size? correct answers The amount of plastic that comes out of the sprue into the
mold in one cycle

What is the range of plastic that comes out of a shot size? correct answers .7 oz to 19.8 lbs

What are the major specification for injection molding? correct answers Shot size and clamp
tonnage

What is the amount of clamp tonnage? correct answers 786 lbs-force per cm squared

What is the time cycle for injection molding? correct answers 1. Fill time
2. Pack Time
3. Cooling/Dwelling Time
4. Dead Time

What is fill time in injection molding? correct answers The time it takes to displace the air in the
mold cavity with plastic material

What is pack time in injection molding? correct answers The time required to maintain enough
pressure to fill out the part and to achieve gate freeze

What is cooling/dwell time in injection molding? correct answers The time required to cool or
set enough for safe removal from the mold cavity

What is dead time in injection molding? correct answers Time required to open the mold, remove
the molded part and close the mold

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

Guaranteed quality through customer reviews

Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.

Quick and easy check-out

Quick and easy check-out

You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.

Focus on what matters

Focus on what matters

Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!

Frequently asked questions

What do I get when I buy this document?

You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.

Satisfaction guarantee: how does it work?

Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.

Who am I buying these notes from?

Stuvia is a marketplace, so you are not buying this document from us, but from seller FullyFocus. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for $11.29. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

79271 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy study notes for 14 years now

Start selling
$11.29
  • (0)
  Add to cart