Abstract:
A coating method and apparatus with which a liquid medium is passed to the nip of two co-acting rolls and atomized therein. One of the rolls comprises a spreader roll having an elastomeric open porous lining, while the other comprises a pressure roll adapted to depress the spreader roll lining along the roll nip to change the kinetic state of the liquid passing through the nip.
Abstract:
A mould for the manufacture of plastic articles consists of a precipitation-hardening alloyed steel containing up to 0.05% carbon, 5-7% nickel, 4.5-7% manganese, up to 2% molybdenum, the remainder, apart from impurities, being iron. A blank is first soft-annealed, subsequently machined to the desired shape, hardened by a heat-treatment, and finally polished.
Abstract:
A falling stream of a liquid tends to obtain a circular cross sectional shape, owing to the surface tension of the liquid. In the manufacture of metal powder by atomizing a falling stream of molten metal it is desired, however, that the stream shall have a flattened cross sectional shape. It has been found useful to make the molten metal flow through an orifice having a rectangular cross sectional area, and to make the molten metal follow the short sides of the orifice for a longer distance than it follows the long sides of the orifice.