Accession Number : ADA302512

Title :   Liquefied Metal Jet Program (LMJP). Environmental Impact Study.

Descriptive Note : Technical rept.,

Corporate Author : TEXAS INSTRUMENTS INC DALLAS DEFENSE SYSTEMS AND ELECTRONICS GROUP

Personal Author(s) : Priest, John ; Dringenburg, Nick ; Smith, Charles ; DuBois, Patrick

PDF Url : ADA302512

Report Date : 15 DEC 1995

Pagination or Media Count : 8

Abstract : Department of Defense (DoD) agencies are major users of electronics and are responsible for much of the current printing wiring board (PWB) manufacturing. Current manufacturing of PWBs utilizes photolithography and chemical etchings which are subtractive processing techniques creating tons of hazardous waste materials and waste water each year. The current processing techniques apply photoresist to the surface of a copper clad board only to remove more than 90 percent of both copper and resist in the next phase of processing. The subtractive process is by design a wasteful processing technique. Current manufacturing processes limit the line size and spaces which determine the circuit density and number of PWB layers. The proposed alternative manufacturing technology is Liquid Metal Jetting (LMJ) While offering significant reductions in hazardous waste produced and overall processing cost, LMJ can excel in one-of-a-kind and replication type PWB production. The proposed LMJ process can produce extremely fine PWB patterns with circuit lines much smaller than existing technologies. With a direct computer-aided design (CAD) interface, the LMJ process is especially compatible with one-of-a-kind and rapid prototyping applications. jg p.4

Descriptors :   *ENVIRONMENTAL IMPACT, *JET FLOW, *PRINTED CIRCUIT BOARDS, *LIQUID METALS, ELECTRONICS, METALS, DENSITY, METHODOLOGY, DEPARTMENT OF DEFENSE, MANUFACTURING, PRODUCTION, COMPUTER AIDED DESIGN, SIZES(DIMENSIONS), WASTE WATER, PROCESSING, PHOTORESIST COATINGS, COSTS, SURFACES, COPPER, CIRCUITS, HAZARDOUS WASTES, CLADDING, HAZARDOUS MATERIALS, PHOTOLITHOGRAPHY, PHOTORESISTORS.

Subject Categories : Inorganic Chemistry
      Physical Chemistry
      Electrical and Electronic Equipment
      Environmental Health and Safety

Distribution Statement : APPROVED FOR PUBLIC RELEASE