摘要:
A device to dissolve solid processing agents and to replenish the dissolved processing agents to an automatic processing apparatus for a silver halide photographic light-sensitive material which has a processing tank and a circulating path for a processing solution provided in the processing tank. The device includes a dissolving tank for storing a dissolved solution therein, and a processing solution supplier provided between the processing tank and the dissolving tank independent of the circulating path, which supplies the processing solution from the processing tank to the dissolving tank. The device further includes a replenisher to replenish the dissolved solution from the dissolving tank to the processing tank. The dissolving tank and the processing tank are communicated through another circulating path.
摘要:
There is disclosed a method for processing a silver halide photographic light sensitive material comprising the steps ofdeveloping the light sensitive material with a developing solution,treating the light sensitive material with a fixing capacity-having solution, and thentreating the light sensitive material with a processing solution (S), wherein part of or the whole of overflow from a tank containing the processing solution (S) is allowed to flow into a tank containing the fixing capability-having solution, and wherein solid processing chemicals are added to the fixing capacity-having solution or the overflow from the tank containing the processing solution (S).
摘要:
The present invention providesa process for the dehydrating and purifying treatment by heating a porous glass preform for an optical fiber comprising passing the porous glass preform through a muffle tube having a SiC layer at least on its inner surface at a high temperature under an atmosphere comprising an inert gas and a silicon halogenide gas;a process for the fluorine-doping treatment by heating a porous glass preform for an optical fiber comprising passing a porous glass preform through a muffle tube having a SiC layer at least on its inner surface at a high temperature under an atmosphere comprising a fluorine compound gas and an inert gas; anda process for the vitrifying treatment by heating a porous glass preform for an optical fiber comprising passing the preform, which has been previously dehydrated and purified, through a muffle tube having a SiC layer at least on its inner surface at a high temperature under an atmosphere gas.
摘要:
A heating furnace for heating a porous preform made of fine particles of quartz base glass for an optical fiber which comprises a heater and a muffle tube positioned inside the heater to separate a heating atmosphere from the heater, wherein the muffle tube body consists of highly pure carbon and an inner wall and an outer wall of the body is coated with a carbon material selected from the group consisting of pyrolytic graphite and solid-phase carbonized glassy carbon.
摘要:
A glass preform for use in the fabrication of an optical fiber having a reduced transmission loss is produced by synthesizing a soot preform by a vapor synthesis method and consolidating the soot preform in an electric furnace to obtain a glass preform, wherein an intermediate body consisting of a core portion and an inner part of a cladding portion is consolidated under atmospheric pressure and an outer part of the cladding portion which surrounds a periphery of the intermediated body is consolidated under reduced pressure or in vacuo.
摘要:
This invention relates to a sintering furnace for the production of a quartz preform which can be used for carrying out dehydration, fluorine-addition and/or sintering of a porous quartz soot preform prepared by a flame hydrolysis method such as a VAD method or a OVD method, and in particular, to such a furnace in which joints in a long furnace muffle so long that fabricating it as open body is impossible can be maintained fully gas-tight, so that it is possible to prevent H.sub.2 O, O.sub.2 and other impurities in the air from entering the muffle from outside, and corrosive and poisonous gases in the muffle are prevented from leakage to outside the muffle. This sintering furnace has a muffle of high purity carbon, the inner wall and/or outer wall of which is coated with a gas-impermeable film, which muffle is a cylinder with an axis in the longitudinal direction and divided into a plurality of parts in the longitudinal direction, the parts each having the upper and lower ends finished so as to be flat and abutting adjacent parts sealed by a carbon gasket between them, and further has an air cylinder for pressing the parts together in the axial direction with a uniform force around the circumference of the muffle.