Source: http://www.google.com/patents/US5605719?dq=6,587,403
Timestamp: 2016-08-29 18:59:59
Document Index: 174556550

Matched Legal Cases: ['art 12', 'art 12', 'art 12', 'art 12', 'arts 12', 'arts 12', 'arts 12']

Patent US5605719 - Method of transporting and applying a surface treatment liquid using gas bubbles - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA method is provided for dynamically transporting and applying a liquid to a surface, such as the bottom surface of a printed wiring assembly (PWA). The liquid may comprise an aqueous reducing agent solution for removing surface oxides prior to a soldering operation. The PWA is placed in proximity with...http://www.google.com/patents/US5605719?utm_source=gb-gplus-sharePatent US5605719 - Method of transporting and applying a surface treatment liquid using gas bubblesAdvanced Patent SearchPublication numberUS5605719 APublication typeGrantApplication numberUS 08/398,473Publication dateFeb 25, 1997Filing dateMar 3, 1995Priority dateMar 3, 1995Fee statusLapsedAlso published asCA2154415A1, EP0730395A2, EP0730395A3Publication number08398473, 398473, US 5605719 A, US 5605719A, US-A-5605719, US5605719 A, US5605719AInventorsD. Morgan Tench, Egbert U. BeskeOriginal AssigneeRockwell International CorporationExport CitationBiBTeX, EndNote, RefManPatent Citations (9), Referenced by (21), Classifications (15), Legal Events (6) External Links: USPTO, USPTO Assignment, EspacenetMethod of transporting and applying a surface treatment liquid using gas bubbles
US 5605719 AAbstract
After solution 16 has been applied to part 12 by dynamic bubbles 22 (and detrimental oxides on part 12 have been reduced), most of solution 16 can be removed by a dry system using an angled gas jet 24 (such as a "nitrogen knife") to move any residual solution 16 along the top a surface of part 12. A vacuum source 26 may be used to remove solution 16 from the bottom surface. In addition, part 12 may be rinsed, if necessary, by a fine spray of deionized water 28 (top and bottom), driven by nitrogen gas, for example. Spray units 28 can travel back and forth along the surface of parts 12 and spray only small quantities of water. Most of the residual rinse water can be removed (if necessary or desirable) by a second nitrogen knife and vacuum system, as illustrated. All of solution 16 and rinse water removed from parts 12 can be collected and fed into a separate holding tank or a solution regeneration unit (not shown). Excess water can be removed by evaporation, for example. Final drying of parts 12, if necessary before soldering, can be accomplished in a convection oven along conveyor line 10. The suitability of the present method for use in a soldering operation was tested using a small applicator system having a square (10 cm�10 cm) porous polypropylene or polyethylene sheet 18 for generating bubbles 22 in oxide reduction solution 16. Tin-lead coated printed wiring board (PWB) coupons (having the same dimensions) were positioned on a rack 2 cm above the level of solution 16 inside a nitrogen atmosphere glove box. Solution 16 was recirculated through inlet 15 by a peristaltic pump from a regeneration cell to/from reservoir 14. Nitrogen gas 20 was fed to the bottom side of the porous sheet 18 with sufficient pressure to produce a bubble layer rising at least 2 cm above the static level of solution 16. Porous sheets 18 having various average pore sizes (10 to 120 μm) and thicknesses (0.6 to 1.0 cm) were evaluated with comparable results. After treatment of the PWB coupons for various times (10 to 30 seconds), through-holes on the PWB coupons were analyzed to determine the extent of oxide removal. Testing of PWB coupons as received (prior to treatment with solution 16) indicated large amounts of detrimental oxides, which were effectively removed by the dynamic bubble application of solution 16 as described above. Good uniformity of the application of solution 16 was demonstrated by testing through-holes at various locations on the PWB coupons.
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