Champion International Corporation Limited

Waldorf Corporation

George M Seiter

Richard J Gould

Iver L Nelson

Curtis H Broz

Loren J Klitzke

A toxic substance extraction cell includes a chamber for housing a heated solvent, a pair of gaskets adapted to be seated on the solvent housing between which is clamped a specimen to be tested; the space between the gaskets being liquid tight, and a cover for clamping the gaskets to the solvent housing. After assembly of the cell with the preheated solvent in the housing and the specimen to be tested between the gaskets, the cell is inverted and supported on a plurality of legs provided on the cover. The solvent is thus placed in contact with the specimen in order to dissolve any toxic substances contained within the specimen. The cell is then reinverted and supported on a suitable stand and allowed to cool, disassembled, and the solvent removed and tested for toxic residue.

Extraction cell

Apparatus for testing the abrasion resistance of a printed area on a carton which is also subjected to flexing during the abrasion process. The apparatus includes means for holding the two carton samples in proximity to each other while one sample is oscillated over and abraded with the other. One of the samples is provided with a raised center portion to simulate flexing of the carton samples as they are abraded.

Apparatus for testing abrasion resistance of printed surfaces

A press-formed plastic coated paperboard tray is hermetically sealed by applying a hot melt or wax to indentations (e.g. relief depressions or wrinkles) formed in a flange of the tray at the corners of the tray. A film cover is then adhered to the tray over the flange and the hot melt or wax filling the indentations in the corner of the flange of the tray provides a hermetic seal for the interior of the tray and its contents, such as sterilized medical instruments, and precludes leakage of liquids housed within the tray.

Hermetically sealed tray

The browning of paperboard subjected to temperatures of up to about 205.degree. C. is minimized by applying to the paperboard a first coating comprising titanium dioxide and an acrylic copolymer and one or more over-coatings comprising a clear acrylic copolymer.

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Minneapolis, MN, United States of America

George M Seiter