Injection molding involves various components and pieces of plastic at different stages of the process. Each of these pieces has specific names that are commonly used in the industry. Here are the key terms:
1. Resin/Pellets
Description:
- The raw plastic material used in the injection molding process. These are usually in the form of small granules or pellets.
Importance:
- The quality and type of resin determine the properties of the final molded part.
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2. Melt
Description:
- The molten plastic that has been heated and is ready to be injected into the mold.
Importance:
- Proper melting of the resin is crucial for ensuring the material flows correctly into the mold cavities and fills them completely.
3. Sprue
Description:
- The channel through which the molten plastic travels from the injection nozzle to the runner system of the mold.
Importance:
- Ensures that the molten plastic reaches the runners and subsequently the mold cavities.
4. Runner
Description:
- A system of channels within the mold that guides the molten plastic from the sprue to the mold cavities.
Importance:
- Distributes the molten plastic evenly to all cavities in the mold, ensuring consistent part quality.
5. Gate
Description:
- The small opening through which the molten plastic enters the mold cavity from the runner system.
Importance:
- The design and placement of the gate affect the flow of plastic into the cavity and the quality of the final part.
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6. Cavity
Description:
- The hollow space within the mold that gives the molten plastic its shape as it cools and solidifies.
Importance:
- Determines the final shape and features of the molded part. Multiple cavities can be used to produce several parts simultaneously.
7. Core
Description:
- The mold component that forms the internal features of the part. It works with the cavity to define the part’s geometry.
Importance:
- Creates internal shapes, holes, and other features within the molded part.
8. Part/Component
Description:
- The final molded piece that results from the injection molding process.
Importance:
- This is the usable product or part that meets the specified design and functional requirements.
9. Ejector Pin Marks
Description:
- Marks left on the part where the ejector pins pushed the part out of the mold.
Importance:
- Proper design and placement of ejector pins minimize visible marks and ensure smooth ejection of the part from the mold.
10. Flash
Description:
- Excess plastic that escapes from the mold cavity and forms a thin layer on the part, typically along the parting line.
Importance:
- Indicates issues with mold clamping or improper pressure settings. Needs to be trimmed off to meet part specifications.
11. Sprue Puller
Description:
- A feature or component that helps remove the sprue from the mold during the ejection phase.
Importance:
- Ensures smooth removal of the sprue and prevents damage to the molded part or the mold itself.
12. Cold Slug Well
Description:
- A small well in the runner system designed to trap the initial cold slug of plastic that enters the mold.
Importance:
- Prevents the cold slug from entering the cavity and causing defects in the part.
13. Vents
Description:
- Small channels that allow air to escape from the mold cavity as the molten plastic fills it.
Importance:
- Prevents air traps and voids in the final part, ensuring better surface quality and structural integrity.
Conclusion
Understanding the terminology of the various pieces of plastic and components involved in injection molding is essential for anyone working in or with the injection molding industry. Each piece, from the raw resin pellets to the final molded part, plays a critical role in ensuring the success of the injection molding process. Proper management and design of these elements lead to high-quality, consistent, and efficient production of plastic parts.
Related Conten: Injection Molding Factory
