Extended-Length Ceramic Hot Bar Technology
July 2001
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MicroJoin, Inc., a subsidiary of Palomar Technologies, Inc., further expanded the productivity potential and deployment flexibility of its Ceramic Hot Bar Technologyâ„¢ (CHBT) by introducing new extended-length CHBT devices up to 7.87 in (200 mm) long. While conventional metal hot bars are said to be impractical for precision bonding at lengths beyond 3 in (76 mm), the company's CHBT hot bars have already been successfully deployed for precision production bonding operations in lengths of more than 6.5 in (165 mm). The new extended length CHBT configurations of up to 7.88 in (200 mm) are said to provide even more flexibility for performing large bonding jobs in a single pass or bonding multiple connections simultaneously.

Due to its excellent coplanarity and uniform thermal characteristics, CHBT has proven to be a good solution for achieving consistent high quality yields from precision Anisotropic Conductive Film (ACF) and Heat Seal Connector (HSC) processes used in the manufacture of flat panel displays, hand-held devices, and other electronic assemblies, according to the supplier. When compared to conventional metal hot bars, CHBT ceramic hot bars reportedly deliver better performance in all of the critical attributes, including flatness, thermal conduction, and electrical isolation. Ceramic's lower thermal coefficient of expansion (TCE) reportedly means less distortion, and its inherently flat crystalline structure is said to optimize coplanarity and thermal conduction, even across lengths of 7.87 in (200 mm) and longer.

The new extended length CHBT can also be custom configured with cutout notches to accommodate intervening components at heights of up to 0.25 in (6.35 mm), without any loss of bonding consistency. This reportedly gives manufacturers the flexibility to work around existing components while still maintaining the high throughput of a single bonding pass, thereby easily accommodating either larger or more complex assemblies or enabling the option to bond multiple smaller assemblies at the same time. The CHBT hot bars can be used on any of the company's Model 2000 or Model 4000 series bonding systems and provide full compatibility with its full range of embedded thermocouple feedback and process control mechanisms.

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