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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.

Author
jmoutoux

Time
4 mins

Type
Multiple Choice

Quiz #
324,012

Updated
May 10 24

# Qns
10

Difficulty
Average

Avg Score
7 / 10

Plays
443

Last 3 plays: Guest 223 (7/10), Guest 49 (8/10), Guest 108 (2/10).

One at a Time - Single Page - Timed Game

Question 1 of 10

1. The time between cycles that your molten plastic sits in the barrel is called? Hint

Cycle Time

Wait Time

Residence Time

Down Time

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Question 2 of 10

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

They bunch up and stop flowing.

They become linear aligned.

They break.

Nothing!

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Question 3 of 10

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

There was dirt in the molten plastic.

Distortion of the plastic.

There was moisture in the melted plastic.

A broken mold.

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Question 4 of 10

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

To make my part clear.

To make my part shiny.

For decoration.

To increase part strength.

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Question 5 of 10

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

The amount which polymer strands can be stretched before breaking.

Polymers resistance to heat.

The ability for polymer strands to stretch.

A polymers UV resistance.

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Question 6 of 10

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

ABS (Acrylonitrile butadiene styrene).

PC(Polycarbonate).

PVC(Polyvinyl chloride).

PP(Polypropylene).

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Question 7 of 10

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

It falls apart.

The part is too hot too touch.

The part warps and shrinks.

The plastic loses its color.

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Question 8 of 10

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

It has a bad smell.

It is too hard to mold.

PVC is Toxic.

It is not the right color.

NEXT>

Question 9 of 10

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

To allow excess plastic to escape the mold.

So air can get into the plastic.

To allow gas to escape.

So we can see what is happening.

NEXT>

Question 10 of 10

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

Gas catches fire!

The gas is hotter than the plastic.

The gas mixed with air explodes.

The trapped gas ignites from the heat generated by pressure.

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Most Recent Scores

Nov 10 2024 : Guest 223: 7/10
Oct 10 2024 : Guest 49: 8/10
Oct 10 2024 : Guest 108: 2/10

Score Distribution

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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