摘要:
A rotating separator removes air coating from pigmented paper coating liquid stock. The separator employs a cylindrical tank which is mounted for rotation about a vertical axis. The separator is operated in a filled condition and an air laden or froth fraction is removed from a radially central region of the tank at the top of the tank, while a non-rotating pickup receives air free coating from a region adjacent the wall of the tank near the tank bottom. A method of treating and applying such a coating includes the steps of pumping an air laden coating into a centrifugal separator while maintaining the separator in a filled condition, removing an air froth from the separator for return to the supply tank, and delivering a substantially air free coating directly to the inlet of a control without the imposition of any intermediate pumping apparatus. The centrifugal pumping action of the separator supplements the pressure head on the coating material.
摘要:
A paper which resists significant distortion in planarity in response to moisture comprises a web which carries a predetermined amount of a polymer-filler blend and which has been dried after application of said blend to a finished moisture level below about 4%, by weight.
摘要:
The invention relates to a method for improving the thermal stability and dielectric integrity of a cellulosic web product. The cellulosic web is impregnated with a nitrogen donor compound such that the web contains not less than 0.2% by weight of the compound and thereafter impregnated with an aqueous vegetable protein solution at a pH of not less than about 8.5.
摘要:
Compositions and method for producing chemical watermarks in finished paper products, the watermarks being produced by applying to the surface of the paper a synthetic resin composition having a chemical grouping therein capable of being insolubilized upon exposure to high frequency radiation, and thereafter exposing the resin composition to such high frequency radiation to insolubilize the resin.
摘要:
THIS INVENTION RELATES TO A PROCESS FOR TREATING PAPER AND OTHER FLEXIBLE SUPPORTS SO AS TO PRODUCE A COATED PRODUCT WHICH PROVIDES A MORE UNIFORM COATING AND A GLOSS GREATER THAT CAN BE OBTAINED BY CONVENTIONAL PROCESSES FOR MAKING STUCCO PAPER.
摘要:
Substrate composites, well adopted for the production of metallized printed circuits and facilely prepared by, e.g., papermaking procedures, include a central core layer comprising fibrous cellulosic material or flaked mica within a matrix of a thermosetting resin binder, said central core element having coextensively laminated to at least one of the face surfaces thereof, a lamina of a thermosetting resin comprising non-conductive metal oxide filler material distributed therethrough, and said metal oxide being borohydride reduceable and reactive to form unstable metal hydride intermediates.
摘要:
A composition for the treatment of paper which improves the wet strength of paper is provided. This composition contains(a) a water-soluble mono- or binuclear hydantoin compound containing glycidyl groups, and(b) a water-soluble copolymer of maleic acid or of one of its derivatives such as maleic anhydride and of a further ethylenically unsaturated copolymerizable comonomer with 2 to 20 carbon atoms such as vinyl methyl ether, dec-1-ene, styrene and/or ethylene or a water-soluble salt of such a copolymer.Also a process for the treatment, preferably the surface treatment of paper with the above composition is provided.
摘要:
Porous carbon sheets suitable for use as fuel cell electrode support plates are produced by stabilizing acrylic filament precursors through the controlled addition of oxygen thereto. The stabilized filaments are thereafter chopped into short lengths, felted and pressed into sheets with the pressing step being performed at a temperature determined by the oxygen content of the stabilized filaments. The sheets are thereafter pyrolyzed to produce the desired porous substrate material.