Abstract: A fused coating material is injected from a nozzle onto a copper foil, the temperature of which is lower than a fusion start temperature of the coating material, and the thus injected coating material is coagulated so as to form a mask on the copper foil. According to a mask pattern of the mask composed of the coagulated coating material, the copper foil is etched for patterning. After that, the coating material, which is the mask, is heated and fused so as to remove the coating material, which is the mask, from the copper foil.

Abstract: A workpiece fixing sheet comprises: a PET sheet as a base body; and a workpiece fixing agent coated on the PET sheet, for fixing a workpiece when the workpiece fixing agent is fused and coagulated according to a temperature, and a difference between a fusion start temperature and a fusion end temperature of the workpiece fixing agent is not more than 5° C.

Abstract: A fusion/coagulation work fixing agent and a machining method are disclosed. The workability of the machining method is improved using the fusion/coagulation work fixing agent (3) which utilizes the fusion and coagulation of itself to fix a work (1). The difference between the fusion start temperature and the fusion end temperature of the fusion/coagulation work fixing agent (3) is not more than 2° C.

Abstract: A mixture of a low-temperature active-type non-corrosive flux and a low-melting point brazing material consisting of zinc, or zinc-aluminum alloy mainly composed of zinc, is applied to at least one 10 of a plurality of aluminum members 10 to 13, and the plurality of aluminum members 10 to 13 are brazed with each other by heating an assembly of the plurality of aluminum members 10 to 13 at a temperature exceeding a melting activity-initiating point of the non-corrosive flux and a melting point of the low-melting point brazing material.

Abstract: In a method of mechanical processing in which mechanical processing is performed while a coolant 19 is sprinkled over a workpiece 13 fastened to a fixing surface using a coagulating agent, any agent having melting point equal to or higher than ordinary temperature from among calcium nitrate tetrahydrate, polyethylene glycol, and paraffin is used as the coagulating agent 12 for fastening the workpiece 13 to a workpiece-fastening stage 14 as the fixing surface, the coagulating agent 12 being solidified to thereby fasten the workpiece 13 to the workpiece-fastening stage 14, and a coolant 19 at an ordinary temperature is used.

Abstract: A phase separation of a salt hydrate as a heat accumulating medium is prevented, thereby maintaining a heat accumulating density of a heat accumulator for a long period of time. A heat accumulating pipe contains Ba(OH).sub.2 .cndot.8H.sub.2 O as a heat accumulating medium which is not subjected to supercooling and a sphere movable in the heat accumulating pipe. A heat insulating vessel having a cooling water inlet pipe and a cooling water outlet pipe is filled with the heat accumulating pipes. By vibrating a heat accumulator having an agitating function which includes the heat accumulating pipes and the heat insulating vessel, the sphere moves in the heat accumulating pipe to agitate the heat accumulating medium, so that a distribution of water becomes uniform and a phase separation is prevented.

Abstract: A heat exchanger made of aluminum alloys comprising a tube made of an aluminum alloy consisting of 0.2 to 1.0 wt % of Cu and the balance Al and inevitable impurities, and fins jointed to the tube, at least a portion of each fin being formed from another aluminum alloy exhibiting and electrochemical potential value lower than that of the aluminum alloy from which the tube is made, so as to provide a sacrificial corrosion effect. Disclosed also is an aluminum alloy material having superior hot-extrusion characteristics and pitting corrosion resistance suitable for use as the material of heat exchanger tubes, the aluminum alloy material consisting of 0.2 to 1.0 wt % of Cu and the balance Al and inevitable impurities.