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Quiz about Injection Molding Bits and Bites
Quiz about Injection Molding Bits and Bites

Injection Molding Bits and Bites Quiz


So you think you're a molder?

A multiple-choice quiz by jmoutoux. Estimated time: 4 mins.
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Author
jmoutoux
Time
4 mins
Type
Multiple Choice
Quiz #
324,012
Updated
Sep 02 23
# Qns
10
Difficulty
Average
Avg Score
7 / 10
Plays
419
Last 3 plays: Guest 98 (4/10), Guest 136 (10/10), Guest 92 (6/10).
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Question 1 of 10
1. The time between cycles that your molten plastic sits in the barrel is called? Hint


Question 2 of 10
2. When molten plastic is injected in to your mold at high speed what happens to the polymer strands? Hint


Question 3 of 10
3. You hear a process technician say that your part has splay. Which of these could have caused this? Hint


Question 4 of 10
4. Why would I want glass fibers in my resin? Hint


Question 5 of 10
5. A resin's (plastic) tensile strength is? Hint


Question 6 of 10
6. What type of resin is used to make CD's? Hint


Question 7 of 10
7. If my molded part does not cool enough before being ejected from the mold what happens? Hint


Question 8 of 10
8. Why would you not mold a toothbrush with PVC(Polyvinyl chloride) plastic? Hint


Question 9 of 10
9. Why would we want to make vents in our molding die? Hint


Question 10 of 10
10. How does gas from molten plastic cause burning in the plastic? Hint



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Most Recent Scores
Mar 24 2024 : Guest 98: 4/10
Mar 18 2024 : Guest 136: 10/10
Mar 17 2024 : Guest 92: 6/10
Mar 10 2024 : Guest 175: 0/10
Mar 07 2024 : Guest 12: 8/10
Mar 06 2024 : Guest 162: 10/10
Mar 01 2024 : Guest 75: 1/10
Feb 25 2024 : Chhhhhh: 6/10
Feb 23 2024 : scrive: 8/10

Score Distribution

quiz
Quiz Answer Key and Fun Facts
1. The time between cycles that your molten plastic sits in the barrel is called?

Answer: Residence Time

The longer your melted plastic sits in the barrel of your Injection Molding machine causes the plastic to degrade reducing its overall properties.
2. When molten plastic is injected in to your mold at high speed what happens to the polymer strands?

Answer: They become linear aligned.

The faster you inject plastic the more linear your polymer strands become.
3. You hear a process technician say that your part has splay. Which of these could have caused this?

Answer: There was moisture in the melted plastic.

When you mold a part with moisture still in the plastic, it causes the polymer strands to break. Once the strands are broken you cannot reuse the plastic anymore. Splay can also be caused by overheating the plastic or by heating for too long.
4. Why would I want glass fibers in my resin?

Answer: To increase part strength.

Glass reinforced resins are used when you need to increase your overall part strength. However glass filled resins can make your overall part stronger it also makes it less visually appealing.
5. A resin's (plastic) tensile strength is?

Answer: The amount which polymer strands can be stretched before breaking.

A resin's tensile strength is important when finding the correct resin to use for parts requiring strength and resistance to breaking.
6. What type of resin is used to make CD's?

Answer: PC(Polycarbonate).

Polycarbonate is a very strong and durable plastic. It one of the more difficult resins to mold due to its non-Newtonian properties.
7. If my molded part does not cool enough before being ejected from the mold what happens?

Answer: The part warps and shrinks.

If your part does not have enough time to cool before ejection it can lose its shape including shrinking.
8. Why would you not mold a toothbrush with PVC(Polyvinyl chloride) plastic?

Answer: PVC is Toxic.

PVC has some carcinogenic properties.
9. Why would we want to make vents in our molding die?

Answer: To allow gas to escape.

When plastic is injected into your mold, gases from the molten plastic build up in the tool causing problems such as voids or even burning of the plastic.
10. How does gas from molten plastic cause burning in the plastic?

Answer: The trapped gas ignites from the heat generated by pressure.

The pressures used to inject molten plastic is tremendous. Pressure creates heat and eventually the gas reaches a point where it ignites burning the plastic in the mold.
Source: Author jmoutoux

This quiz was reviewed by FunTrivia editor crisw before going online.
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