Release liners for molded product production

Details Release liners for molded product production Release liners for molded product production

1997-05-15

1998-12-08

Pezzuto, Helen L.

Stock material or miscellaneous articles

Composite

Of carbohydrate

428218, 428534, B32B 2106

Patent

active

058466622

ABSTRACT:
A mold release liner for a heated pressure mold for making products such as printed circuit boards is made utilizing two or more wet-laid fiber layers of cellulose or cellulose derivative fibers (such as wood, cotton, cellulose acetate, or rayon fibers, or mixtures of these). The first layer has a sufficiently low density so that it acts as a cushion and absorbs deformation when used as a release liner in the mold (typically it has a thickness of between 8-250 mils, most desirably 40-90 mils, and a basis weight of about 25-350 pounds per ream, most desirably 130-160 pounds per ream). A second layer is of much higher density than the first layer and readily releases from the molds, for example comprising condenser tissue or a similar product, having a thickness of between 0.5-10 mils and a basis weight of 4-50 pounds per ream of 500 sheets. The first and second layers are in face-to-face engagement with each other, and may be adhesively laminated together with sheet, spray, liquid, or powder adhesive. A third layer, substantially like the second layer but on the opposite side of the first face, may also be provided. The second and third layers may have a chromium complex release agent applied to them.

REFERENCES:
patent: 4166150 (1979-08-01), Mattor et al.
Montecell Chromium Complex Product Sheets, 1989; Seppic S.A., Paris, France .

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