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Bernoulli Air-Knife-Type Greensheet Cleaner With Self-Leveling Feature

IP.com Disclosure Number: IPCOM000046627D
Original Publication Date: 1983-Aug-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Mueller, WF: AUTHOR [+2]

Abstract

A Bernoulli air-knife cleaner for multilayer ceramic (MLC) greensheets is provided with a self-leveling feature. The air knife cleans the bottom side of the MLC greensheet as it is transported from the punch station to a verifier station. At the same time that the bottom side of the greensheet is being cleaned, the top surface and punch vias are also being cleaned with another Bernoulli air knife. As shown in Fig. 1, when transport carriage 3 with greensheet 1, held in place by vacuum chuck 2, moves over air knife 4 on its way from the punching station to the verifier station, the escaping air 5 causes the air knife to be attracted to the greensheet by the Bernoulli effect. Parallelogram 6 permits the air knife to move with a minimum of friction and to maintain a perpendicular orientation with respect to the greensheet.

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Bernoulli Air-Knife-Type Greensheet Cleaner With Self-Leveling Feature

A Bernoulli air-knife cleaner for multilayer ceramic (MLC) greensheets is provided with a self-leveling feature. The air knife cleans the bottom side of the MLC greensheet as it is transported from the punch station to a verifier station. At the same time that the bottom side of the greensheet is being cleaned, the top surface and punch vias are also being cleaned with another Bernoulli air knife. As shown in Fig. 1, when transport carriage 3 with greensheet 1, held in place by vacuum chuck 2, moves over air knife 4 on its way from the punching station to the verifier station, the escaping air 5 causes the air knife to be attracted to the greensheet by the Bernoulli effect. Parallelogram 6 permits the air knife to move with a minimum of friction and to maintain a perpendicular orientation with respect to the greensheet. As the greensheet moves across the air knife, the high velocity air flow 5 moves any debris which may have been produced during the prior punching process. The removed particles are absorbed by vacuum produced in chamber 7. To eliminate distortion of the greensheet by the weight associated with the air knife which clings to the greensheet by the Bernoulli effect, several small slots 9 are added to the bottom of the air knife, as shown in Fig. 2. Air flow 8 is adjusted to make the resulting force equal to the mass of the air-knife assembly 4. This results in a high velocity clea...