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PolyTect tm OVERMOLDING PROCESS & MATERIAL for ELECTRONIC MODULE ASSEMBLIES

PolyTect tm OVERMOLDING PROCESS & MATERIAL for ELECTRONIC MODULE ASSEMBLIES. ELECTRONIC MODULE Overview.

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PolyTect tm OVERMOLDING PROCESS & MATERIAL for ELECTRONIC MODULE ASSEMBLIES

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  1. PolyTecttm OVERMOLDING PROCESS & MATERIAL for ELECTRONIC MODULE ASSEMBLIES

  2. ELECTRONIC MODULE Overview Electronic modules are encapsulated for various reasons, e.g., protection of delicate components due to environmental conditions including dust, dirt, and moisture, protection in thermally unstable environments, and to protect technologies and designs. Applications: Hand held equipment, industrial controls, retail security, automotive components, electronic sensors (motion, photonic, etc..)

  3. ELECTRONIC MODULE COMPOSITION • Electronic Modules may consist of: • Populated Printed Circuit Boards • Custom Components • Input/Output Connectors • RF Transmission Capability • Mounting Hardware

  4. CONVENTIONAL ENCAPSULATION Option 1: Injection mold housing and insert PCB into housing. Then fill housing cavity with a potting compound and bake unit. Total assembly time up to 3 hours.

  5. CONVENTIONAL ENCAPSULATION Option 2: Cast or formed housing and insert PCB into housing. Place seal or gasket around parameter. Affix cover plate with fasteners. Total assembly time 2-3 minutes.

  6. INJECTION MOLDING ENCAPSULATION Process: Typical injection molding cavity pressures range between 1200psi and 2400 psi Problem: Shear stress of common solder (63%sn, 37%pb) for mounting components to PCB’s is @ 500 psi Result: Component solder failure would occur during injection molding due to shearing of solder joints

  7. INJECTION MOLDING ENCAPSULATION Process: Typical injection molding material temperatures range between 218 C (425 F) and 382 C (720 F) Problem: Melting point of common solder is 183 C (361 F) Result: Component solder failure would occur during injection molding due to melting of solder joints

  8. PCB ENCAPSULATION PARAMETERS • PolyTect molding pressures less than 500 psi • PolyTect molding temperatures less than 180 C

  9. ADVANTAGES OF THE PolyTect PROCESS • Low molding pressures of 100 psi • Low material temperatures of 100F • Low mold temperatures of 140F • Use of solid or foam materials

  10. PolyTect OVERMOLDING PROCESS 1. The populated PCB’s and any associated hardware components are placed into the mold base Conventional multi-cavity mold

  11. PolyTect OVERMOLDING PROCESS 2. The molding cycle takes between 30 and 120 seconds and monitors material temperature, pressure, velocity and shot size Molding press closed during polymer injection

  12. PolyTect OVERMOLDING PROCESS The PolyTect process can be a single or multi-mold depending on the part size Molds can be single or multi-cavity Multi-cavity molds can be located in a single press, carousel-rotating press or a self-contained press

  13. PolyTect OVERMOLDING PROCESS 3. Completed parts are removed and inspected

  14. PolyTect OVERMOLDING PROCESS The PolyTect process allows parts to be molded clear then opaque sequentially providing for preprogrammed QC inspection. Parts can be molded with or without color providing part security and/or identification.

  15. PolyTect MATERIAL PROPERTIES Mechanical and thermal properties are custom tailored for each application. Materials used are proprietary multi-component polyurethane systems. Tensile strengths range between 2500 psi and 9000 psi Elongation values range between 20% and 300% Operating temperatures range between –40C and +85C Very low absorption rates

  16. PolyTectMATERIALS • Have the ability to be custom blended to provide: • Foam (Low density and rigid) • Solid (high density and rigid or very flexible) • Soft or Hard (shore A 55 to shore D 95) • Fast or slow reactivity (1 second gel to 45+ seconds)

  17. PolyTect OVERMOLDING PROCESS & MATERIAL SUMMARY Developed to address the market need for an efficient way to encapsulate electronic modules. Modules consist of fully populated printed circuit boards Eliminates the need to mold polymer housings used in conjunction with standard sealing methods with a one step molding process.

  18. PolyTect OVERMOLDING PROCESS & MATERIAL SUMMARY Made of specialty-formulated materials to mold at temperatures and pressures below the shear stress of solder joints. Allows for over molding of delicate components without degradation of performance Cost Reduction of traditional manufacturing and assembly methods

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