Understanding Low Pressure Molding Materials ...

Understanding Low Pressure Molding Materials

Low-pressure molding is a superior method for encapsulating delicate components. The different types of plastics used in this process significantly influence the strength, durability, and thickness of the final product. PA (polyamide) has become the prevalent material in low-pressure molding systems because of its high mechanical properties and melting points. When choosing the right material for your electronic designs, you may be overwhelmed by the options available. Let us guide you through the basics to make an informed decision.

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Overview of Low Pressure Molding

Low-pressure molding involves injecting plastic into a mold at low pressure, which then forms an overmold around an electronic component. This method protects the component from damage and offers strain relief. It is also more efficient than traditional overmolding techniques because it requires less force to push the plastic into the mold.

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Common Materials for Low Pressure Molding

The chosen plastic must exhibit strength, fluidity, thermal stability, and corrosion resistance. Typically, the plastic is heated to between 180°C and 240°C in the molding machine, allowing it to flow smoothly around the object without clogging channels required for air evacuation during injection. PA, particularly PA alloy, stands out due to its high mechanical properties and melting points. Its unique molecular structure makes it tough, wear-resistant, self-lubricating, and fatigue-resistant, making it a popular engineering plastic.

The main PA materials used include:

• KY88** series (Kane New Material)
• Model BOSTIK (Bostik Findlay) TRL S.A. series
• TECHNOMELT (Henkel)® PA 668PA
• And more

Bio-based Polyamide (Biopolyamides), derived from renewable resources like natural fats and oils, is another option available for low-pressure injection molding machines. These materials are suitable for electronics applications that require UV light resistance, thermal stability, solvent resistance, and chemical resistance.

Tips to Select the Right Low Pressure Molding Materials

Low-pressure materials can endure higher temperatures than regular silicone rubber, making them useful for electrical components like heat sinks and connectors. They are also ideal for flexible parts such as cables or wires because they don't need post-curing at elevated temperatures. Here are some tips to select the right materials for various applications:

• Automotive Electronic Parts

  : Choose high-temperature-resistant materials due to the high ambient temperatures.

• Outdoor Electronics

  : For applications like wearable devices, bicycle components, underwater devices, or certain sensors, higher viscosity materials may be required.

Versatile Low Pressure Injection Molding Machines

Most PA materials are compatible with King's low-pressure injection molding machines, especially modified PA or PA alloy materials that offer improved strength, modulus, hardness, stiffness, and wear resistance. To meet electronic device requirements, King’s Solution Corp has invested significantly in R&D to enhance functionalities like component sealing, moisture-proofing, water-proofing, and dust-proofing.

Contact us to discuss your requirements for 5-Axis CNC Machining For Automotive Part Prototypes. Our experienced sales team will assist you in identifying the best options for your needs.

Read also : C Type Shuttle Table Low Pressure Molding Machine

Critical Steps in Understanding How to Process Them Correctly for Low Pressure Overmolding

Before processing, physical property inspections such as impact resistance, melting index, softening point, deflection temperature, tensile strain, and Young's Modulus are essential. Mechanical processing requires the use of screw shear mixing to inject, extrude, and mix color compounds, considering material applicability and mold design. King's technical team employs a non-screw design and back pressure controllers for low-pressure plastic professional models.

PA's crystalline nature affects its water absorption, dimensional stability, and mold fit. It is crucial to lower moisture content by drying at 80°C for over 4 hours. Higher temperature and longer drying times may be necessary to avoid air bubbles or poor shape post-formation.

Low Pressure Molding Machine Manufacturer

We hope this article helps you understand the materials used in low-pressure molding. Remember, selecting the appropriate material is vital for your electronic overmolding project to ensure it can withstand wear and tear over time.

For more information about injection molding machines, please refer to Low Pressure Injection Molding Turn-Key Solution or contact us today.

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Low Pressure Molding

Low-pressure molding offers multiple protective benefits, making it ideal for applications like potting, waterproofing electronics, and conformal coating replacement. Learn more by exploring the infographic.

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