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Automatic MLC Screening Mask Cleaner

IP.com Disclosure Number: IPCOM000051285D
Original Publication Date: 1981-Jan-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 4 page(s) / 158K

Publishing Venue

IBM

Related People

Davis, GT: AUTHOR [+4]

Abstract

This apparatus is used in an automatic multilayer ceramic (MLC) screening machine for automatically cleaning and drying the stencil masks used to print the conductive patterns on the ceramic greensheets. The molybdenum paste which is screened through the stencil mask has a consistency somewhere between that of tar and putty. The mask must be cleaned after each greensheet is screened. The molybdenum paste, which is to be cleaned off the mask, is somewhat difficult to remove. Heretofore, the mask has been cleaned manually.

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Automatic MLC Screening Mask Cleaner

This apparatus is used in an automatic multilayer ceramic (MLC) screening machine for automatically cleaning and drying the stencil masks used to print the conductive patterns on the ceramic greensheets. The molybdenum paste which is screened through the stencil mask has a consistency somewhere between that of tar and putty. The mask must be cleaned after each greensheet is screened. The molybdenum paste, which is to be cleaned off the mask, is somewhat difficult to remove. Heretofore, the mask has been cleaned manually.

Fig. 1 is a perspective view of the automatic cleaning unit, and Fig. 2 is a plan view showing the location of the cleaning unit immediately in back of a screening station of the automatic MLC screening machine. The cleaning unit includes a mask removal station 10, a lefthand (L.H.) cleaning station 11 located on its left side, and a righthand (R.H.) cleaning station 12 located on its right side.

Both cleaning stations are of identical construction. Two identical stencil masks are used in the system such that one mask is being cleaned while the other mask is being used to print a greensheet.

Fig. 3 shows the shuttle and carrier mechanisms used to shuttle the masks back and forth between the cleaning stations and the mask removal station. A pair of carrier mechanisms 13 and 14 are loosely mounted on a rotatable shaft 15 which extends through all three stations. A movable door 16 is hung on the shaft 15 intermediate the carrier mechanisms 13 and 14. Items 13, 14 and 16 are moved as a single unit back and forth on the shaft 15 by a piston mechanism
17. The door 16 serves to seal off the cleaning station in which the cleaning operation is currently being performed. Each of the carrier mechanisms 13 and 14 includes a pair of carrier arms 18 which are used to support and hold the outer frame portion of a stencil mask.

The por...