Low Pressure Molding

Low pressure molding is an advanced encapsulation process that uses thermoplastic polyamide materials to protect and seal electronic components, printed circuit boards, and sensitive assemblies against environmental factors. This innovative low pressure molding process combines speed, precision, and environmental protection, making it ideal for industries requiring superior component protection without the risk of damage from high temperatures or pressures. At Accelerated Assemblies, we specialize in providing superior low pressure molding services that deliver exceptional protection, reliability, and cost effectiveness for your electronic assemblies.

Our Capabilities

We leverage state-of-the-art equipment and proven methodologies to deliver high-quality low pressure molding services. Our key capabilities include:

1. Advanced KAPPA 1000H Low Pressure Molding System: We utilize the industry-leading KAPPA 1000H production platform, featuring horizontal injection, single-station operation, and external melt tank for maximum flexibility and high-volume production capability.
2. High-Performance Polyamide Materials: We work with premium hot-melt polyamide compounds that provide outstanding adhesion, environmental resistance, and protection against moisture, dust, chemicals, vibration, and temperature extremes (-40°C to 130°C).
3. RoHS and REACH Compliant Materials: Our low-pressure molding services use polyamide materials that are environmentally sustainable. These materials are RoHS and REACH compliant, and VOC-free.
4. PCB and Component Encapsulation: We specialize in encapsulating circuit boards, sensors, control modules, and delicate electronic assemblies without the risk of thermal or mechanical damage.
5. Custom Mold Design and Fabrication: Our engineering team designs and fabricates precision molds tailored to your specific component geometry and protection requirements.
6. Waterproofing and Environmental Sealing: We achieve superior sealing performance, including IP67 and IP68 ratings, protecting assemblies from water ingress, dust, and harsh environmental conditions.
7. Cable Overmolding and Strain Relief: Our low-pressure molding services include cable and connector overmolding, providing mechanical strain relief and waterproof sealing for wire harness assemblies.
8. Fast Turnaround for Prototypes and Production: Whether you need prototype validation or full production runs, we deliver rapid turnaround times while maintaining strict quality standards.

Benefits of Low-Pressure Molding

The low-pressure molding process offers distinct advantages over traditional encapsulation methods, making it the preferred choice for protecting sensitive electronic assemblies.

1. Superior Environmental Protection: Low pressure molding provides excellent resistance to moisture, dust, dirt, chemicals, UV exposure, shock, and vibration, ensuring long-term reliability in harsh operating environments.
2. Gentle Processing for Delicate Components: The low injection pressure (50-200 PSI) and moderate processing temperature (180-210°C) prevent damage to fragile solder joints, sensitive ICs, and delicate electronic components that would be compromised by traditional high-pressure injection molding.
3. Faster Cycle Times: Complete molding cycles typically take 15-60 seconds, compared to hours required for traditional potting and curing processes, significantly increasing production throughput and reducing manufacturing costs.
4. Reduced Material Waste and Weight: The precision of low-pressure molding allows for skylining around components with minimal material thickness (as low as 1mm), reducing material consumption, product weight, and shipping costs.
5. Enhanced Design Flexibility: Low pressure molding materials can be formed into complex geometries, embossed or debossed with branding, and even serve as the product housing, eliminating the need for separate enclosures.

Process of Low-Pressure Molding

At Accelerated Assemblies, we follow a systematic and precisely controlled low pressure molding process that ensures consistent quality, superior protection, and reliable performance.

• Design Review and Material Selection: Our engineering team reviews your component specifications, environmental requirements, and performance criteria to select the optimal polyamide material and establish process parameters.
• Custom Mold Design and Fabrication: We design precision molds tailored to your component geometry, ensuring proper material flow, complete encapsulation, and the desired final form factor. Prototype and production tooling options are available.
• Component Preparation and Cleaning: Electronic assemblies and components are inspected and cleaned to ensure proper material adhesion and contamination-free encapsulation.
• Material Heating and Conditioning: High-performance polyamide material is heated to the optimal processing temperature (typically 180-210°C), achieving low viscosity for complete cavity filling and gentle component encapsulation.
• Mold Loading: The prepared component or PCB assembly is precisely positioned in the mold cavity, with fixtures ensuring correct alignment and preventing movement during injection.
• Low Pressure Injection: The liquefied polyamide material is injected into the mold cavity at low pressure (50-200 PSI) using our KAPPA 1000H system's precision gear pump. This ensures complete encapsulation without damaging delicate components.
• Cooling and Solidification: As the material contacts the relatively cool mold and components, it begins solidifying immediately. Continuous pressure is maintained to compensate for material shrinkage during the cooling phase, ensuring void-free encapsulation.
• Mold Opening and Part Removal: Once the material has fully solidified (typically 15-60 seconds), the mold opens and the encapsulated assembly is removed, ready for immediate handling and testing.
• Quality Inspection and Testing: Each molded assembly undergoes visual inspection and, if required, functional testing to verify complete encapsulation, proper sealing, and correct operation.
• Packaging and Delivery: Completed assemblies are securely packaged and delivered within the agreed timeframe, ready for integration into your final products.

Industries We Serve

At Accelerated Assemblies, our low-pressure molding services protect critical electronic assemblies across diverse industries where reliability, durability, and environmental resistance are essential.

1. Medical Devices: Our low-pressure molding protects components in diagnostic equipment, patient monitoring systems, and implantable device electronics while meeting stringent biocompatibility and sterilization requirements.
2. Consumer Electronics: We provide waterproofing and impact protection for wearables, smart home devices, fitness trackers, and portable electronics exposed to daily wear and environmental challenges.
3. LED Lighting: Our services protect LED driver circuits, outdoor lighting assemblies, and automotive lighting modules from moisture ingress, thermal cycling, and UV degradation.
4. Military and Aerospace: We deliver ruggedized encapsulation for avionics, communication systems, and defense electronics requiring MIL-SPEC environmental protection and long-term reliability.
5. Telecommunications: We safeguard network equipment, base station electronics, and outdoor communication devices from weather exposure, moisture, and environmental contamination.
6. Energy and Renewable Power: Our low-pressure molding protects solar inverters, battery management systems, wind turbine controllers, and charging infrastructure electronics in demanding outdoor installations.

Contact us today to discuss your low-pressure molding needs and experience superior environmental protection for your electronic assemblies.

Frequently Asked Questions (FAQs)

Can low-pressure molding materials be recycled or reused?
Our polyamide materials are environmentally responsible and RoHS/REACH compliant. While they are thermoplastic and theoretically recyclable, reuse depends on your local recycling capabilities and contamination of the material after molding. We can advise on sustainable disposal options.

How does low-pressure molding handle heat dissipation for electronic components?
Polyamide compounds used in low-pressure molding offer moderate thermal conductivity. For heat-sensitive assemblies, mold designs can include ventilation channels or thin encapsulation layers to help dissipate heat while maintaining protection.

Can low-pressure molding include embedded components such as LEDs or sensors?
Absolutely. The gentle processing conditions allow delicate components to be embedded without damage, enabling integrated functional features within the molded assembly.