Plastic and nonmetallic article shaping or treating: processes – With severing – removing material from preform mechanically,... – Dividing work to form plural articles
Patent
1979-01-12
1980-12-16
Hoag, W. E.
Plastic and nonmetallic article shaping or treating: processes
With severing, removing material from preform mechanically,...
Dividing work to form plural articles
260 173, 264176R, 264232, 264239, 264294, 264297, 264DIG34, B29C 1700, B29C 2500, B29G 200
Patent
active
042397219
ABSTRACT:
A process for the manufacture of patterned urea thermoplastic molding compound preforms is disclosed where such preforms are suitable for the compressive thermocasting of buttons containing cast holes and displaying an undistorted and consistent pattern. The process utilizes commercially produced molding compound, pigment, adhesives, crystalligerous material plus water which are united to form pliable, self-adhesive aggregates of various colors or hues. These masses are volumetrically measured and/or formed and then assembled in various specific arrangements. This mass is then contained and compressed to expel excess air and cause adhesion of the constituents. The mass is then extruded to a consistently patterned soft rod of a specific diameter. The rod is subsequently sliced to a specific thickness and weight and then dried prior to shipment. In the preferred embodiment of the process, excessive drying is performed by thermal dehydration and necessary minimum water content levels are re-established by specifically prolonged exposure to supersaturated air.
REFERENCES:
patent: 1819811 (1931-08-01), Clemens
patent: 1944464 (1934-01-01), Richardson
patent: 2022895 (1935-12-01), Morrell
patent: 2573050 (1951-10-01), Orsini
patent: 2689981 (1954-09-01), McCarthy
patent: 3981951 (1976-09-01), Richman
Simonds et al., Handbook of Plastics, Van Nostrand, _N.Y., (1944), pp. 193-198.
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