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By Paulson Training Programs
Related links: Injection Molding | InSite360
1. Arrange the 7 steps below in correct order to form the typical practical injection molding sequence:
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Plastic raw material is stored in the hopper |
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When enough melted plastic has accumulated ahead of the screw, the screw stops rotating |
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It is conveyed forward by the flights of the screw and is gradually melted as it moves forward |
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The plastic goes through the nozzle, sprue, runners, gates and on into the mold cavities |
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Packing occurs – a little more plastic is forced in after the cavities are full |
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The plastic falls on the rotating screw |
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The screw, acting as a plunger, pushes the melted plastic out of the injection barrel |
2. What are the four functions of the mold?
3. What are baffles and bubblers?
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Cooling devices used in recessed areas in the mold (for example deep cores) to cool plastic. |
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The small flow passage at the end of the runners that allows plastic to flow into the mold cavities. |
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None of the above |
| Answers |
Question 1
Here is the correct order of the steps:
- Plastic raw material is stored in the hopper.
- The plastic falls on the rotating screw.
- It is conveyed forward by the flights of the screw and is gradually melted as it moves forward.
- When enough melted plastic has accumulated ahead of the screw, the screw stops rotating.
- The screw, acting as a plunger, pushes the melted plastic out of the injection barrel.
- The plastic goes through the nozzle, sprue, runners,gates, and on into the mold cavities.
- Packing occurs – a little more plastic is forced in after the cavities are full.
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Question 2
1. Provide flow passages for the plastic to quickly fill cavities
2. Provide for escape of air from the cavities
3. Cool the plastic
4. Provide a way to eject the molded parts
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Question 3
A
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March 26, 2007
Paulson Training Programs has been providing top-level training to the plastics industry since 1976.
They offer training for every plastics processor at every job level.
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