Attachment_A_Panel_Specifications.docx

Attachment A, PORCELAIN SPECIFICATIONS

1. Porcelain Enamel Imaging

Imaging: Line art/script shall be screened one color at a time with intermediate firing of each color before subsequent color is screened. The quality of the screen image shall be of high resolution with no ragged edges. Line art shall be screened over background colors, so that characters are not obscured by the application of color. Line art resolution shall be accurately printed at a standard which accepts as a minimum ½ point line thickness and type in sizes as small as 4 lines per inch (lpi).

Black and white and color photographic / lithographic imaging shall be available at a resolution of up to 200 lpi.

Multiple color work shall maintain (+ / -) 1/500 registration of all layers, one to another. Color layers shall be fully opaque, with no bleed-through, or change in hue, value or intensity as a result of the layering of color in the imaging process. Color shall match the specified color as converted from PMS reference to porcelain enamel and as approved by the COR as a match sample prior to imaging the job. Colors shall match CMYK with color shift base on inherent qualities of base frits.

The contractor shall:

A. Image in tight register in full color on a panel size range from 6" x 9" up to 42" x 72".

B. Maintain a capacity to handle the above described imaging in a group of subjects (average 30 subjects) comprising one job. All production phases of the work described shall be concurrent and continuous.

C. Fuse glass (enamel) to various substrates including enameling steel, stainless steel and plate glass.

D. Image four-color process images in perfect registration of separation rulings up to 150 lines per inch.

E. Image fine line detail including mezzotint and other special effect conversion screens, 150 line half-tones and duo-tones, and 6 pt.

serif typefaces without discernable saw-tooth edge or other character defects.

F. In-house capability to accomplish the required mechanical and chemical substrate preparation prior to imaging.

G. In-house capability to fabricate, image, and reclaim screens.

H. In-house capability to mix, apply, expose, develop, and fix enamel bearing photosensitive emulsions.

I. Mix and match enamel colors to PMS color specifications or government-furnished color swatches.

J. Maintain facilities and equipment required to prepare films, mix and match colors, fabricate screens, image screen stencils, screen print, apply presensitized coatings, prepare metal for the enameling process, and image and fire porcelain enamel exhibits.

K. Capability to round the panel edges and apply a continuous coat of porcelain enamel around the edges from the front of the panel to the back.

2. Film Preparation

The preparation of film mechanicals (positives and negatives) shall include the development of graphic layouts based on government furnished design concepts. This phase is intended to support the production of the previously described porcelain enamel imaging and shall specifically involve the following:

A. Preparation of original black and white and full color illustrations and photographic images for reproduction, i.e., the intermediate photomechanical steps required to convert original images into the necessary film form for porcelain enamel imaging.

B. Table work to include paste up, negative stripping, and assembly of film positive and negative elements into final color separated and registered format required for porcelain enamel imaging.