Injection mold design: injection runner
author: Universe Plastic
2024-07-24
In the design of injection molds, the injection runner is a key component. It is responsible for transporting molten plastic from the nozzle to the mold cavity and plays an important role in injection molding.
Reasonable flow channel design can ensure uniform distribution of plastic, reduce waste and improve product quality. The following are the key points and steps shared by Universe Plastics engineers when designing injection molding runners.
Injection molding runner type
1. Circular flow channel
The most commonly used runner type, with the best flow and cooling effects.
2. Trapezoidal flow channel
Often used in rapid mold manufacturing, but the fluidity and cooling effect are not as good as circular runners.
3. Semicircular flow channel
It is suitable for multi-cavity molds and is relatively simple to manufacture, but has slightly poor fluidity.
Key points of injection mold runner design
1. Type selection
For the injection molding production of different products, the selection of runner type is very important. It is necessary to design the appropriate runner type according to the product shape, mold structure and production needs.
2. Runner size
The diameter of the flow channel should be suitable for the viscosity and fluidity of the molten plastic. The larger the flow channel, the smaller the pressure loss, but the cooling and solidification time increases; the smaller the flow channel, the pressure loss increases, but the cooling and solidification time decreases.
3. Flow channel balance
Runners in multi-cavity molds should be designed to be balanced to ensure that all cavities are filled with molten plastic at the same time. Unbalanced runners can result in inconsistent product size and quality.
4. Cooling and exhaust
The layout of the cooling channels needs to be considered when designing the flow path to ensure uniform cooling. It is also necessary to design an effective exhaust system to avoid air bubbles and burn defects.
5. Verification and adjustment
Use simulation software to simulate and verify the flow channel design, and adjust the design in a timely manner if problems are found.
Frequently asked questions about runner design
1. Improper flow channel size
As a result, the mold filling is incomplete or the flow is uneven. The flow channel size needs to be adjusted according to the specific materials and injection parameters.
2. Unbalanced flow channel
Some cavities in multi-cavity molds are insufficiently filled, which needs to be solved by adjusting the length and diameter of the runner.
3. Uneven cooling
It will lead to product dimensional errors and quality problems, and cooling channels need to be arranged appropriately.
4. Poor exhaust
Leading to bubbles and burn defects, vents need to be added at strategic locations.
Summarize
Designing the injection molding runner requires comprehensive consideration of many factors, and ensuring the quality and consistency of the final product through reasonable design and verification.
Dongguan Universe Plastic Factory has more than 15 years of experience in mold design and manufacturing. It has a professional team and advanced processing equipment, and can provide high-quality and cost-effective injection mold manufacturing services.
If you are looking for a professional mold manufacturer, please contact us to get the latest service price.
Comprehensive Guide to Injection Mold Design
Plastic manufacturing process: multi-stage injection molding
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