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Browse Prior Art Database

Improved Laminate Book Construction

IP.com Disclosure Number: IPCOM000107230D
Original Publication Date: 1992-Jan-01
Included in the Prior Art Database: 2005-Mar-21
Document File: 1 page(s) / 42K

Publishing Venue

IBM

Related People

Conn, RB: AUTHOR [+4]

Abstract

Disclosed is a laminate book construction which produces printed circuit boards with improved flatness, dimensional stability, surface conditions, and laminate integrity. Key elements are a paper press pad (2 sheets blotter paper) and a silicon rubber press pad (1/16' COHRlastic (Trademark of CHR Industries) silicone solid rubber reinforced with fiberglass). The paper press pad is placed on the outside of the registration plate and the rubber press pad is placed on the inside (figure).

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Improved Laminate Book Construction

      Disclosed is a laminate book construction which produces
printed circuit boards with improved flatness, dimensional stability,
surface conditions, and laminate integrity.  Key elements are a paper
press pad (2 sheets blotter paper) and a silicon rubber press pad
(1/16' COHRlastic (Trademark of CHR Industries) silicone solid rubber
reinforced with fiberglass).  The paper press pad is placed on the
outside of the registration plate and the rubber press pad is placed
on the inside (figure).

      In the manufacture of printed circuit boards one of the first
steps, prior to laminating under high pressure and temperature, is
lay-up.  During this step, not only the material to be laminated
(i.e., copper, prepreg, cores), but also related tooling (i.e.,
planishing plates, registration plates, press pads) are placed upon
each other to form books.  These books are then placed between
platens of the laminations press.

      There are numerous variations of press pad materials and
placements used in the printed circuit board industry. This
disclosure describes one which significantly reduces defects commonly
attributed to the laminations process.

      Disclosed anonymously.