Browse Prior Art Database

Face Protection of Printed Circuit Boards

IP.com Disclosure Number: IPCOM000089881D
Original Publication Date: 1968-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 65K

Publishing Venue

IBM

Related People

McDermott, CJ: AUTHOR

Abstract

Removable protective plastic sheet 1 is rolled over or otherwise adhered to external copper foil faces 2 of a partially formed printed circuit device 3 as shown at A. This protects the surface copper 2 from contamination during formation, as in drawings B...D, of plated through filled holes such as 4. In the formation of such holes, a resin filler 5 is pressed over and into the drilled and plated hole areas to reinforce the substrate structure of the device. This is useful, for example, to permit incorporation of the device into a multilayer structure. When the filler resin in the plated through-holes has cured, sheet 1 is removed by peeling or chemical dissolution. Resin stubs and copper burrs at the hole entrances are then removed mechanically.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

Face Protection of Printed Circuit Boards

Removable protective plastic sheet 1 is rolled over or otherwise adhered to external copper foil faces 2 of a partially formed printed circuit device 3 as shown at A. This protects the surface copper 2 from contamination during formation, as in drawings B...D, of plated through filled holes such as 4. In the formation of such holes, a resin filler 5 is pressed over and into the drilled and plated hole areas to reinforce the substrate structure of the device.

This is useful, for example, to permit incorporation of the device into a multilayer structure. When the filler resin in the plated through-holes has cured, sheet 1 is removed by peeling or chemical dissolution. Resin stubs and copper burrs at the hole entrances are then removed mechanically.

1

Page 2 of 2

2

[This page contains 3 pictures or other non-text objects]