This invention relates to a foamed heat insulation material for refrigerators and freezers which makes it possible to reduce the quantity of a fluorocarbon foaming agent used therein. Said foamed heat insulation material is obtained by mixing a carbon dioxide adsorbent prepared by treating the surface of the carbon dioxide absorbent so as to make it hydrophobic with a water-containing premix component and an isocyanate component and stirring the resulting mixture. The foamed heat insulation material thus obtained can reduce the quantity of the fluorocarbon foaming agent at the time of foaming owing to the use of water as a foaming agent, and after the foaming, can adsorb off with the carbon dioxide adsorbent the carbon dioxide generated by the isocyanate-water reaction and thereby purify the gas in foams into a fluorocarbon gas.

Foamed heat insulation material

Provided is a substrate washing method in which the process time necessary to remove foreign matter on a substrate surface can be reduced and the surface can be prevented from being irregularly ground. The substrate washing method for washing a substrate (10) by grinding the same comprises a step of conveying a first substrate (10) and a second substrate, a step of grinding the first substrate (10) by a roller grinding stone (20), and a step of grinding the second substrate by the roller grinding stone (20). In the step of grinding the first substrate (10), the roller grinding stone (20) is slid in a direction (40) perpendicular to the conveyance direction (50) of the first substrate (10) and in the longitudinal direction of the roller grinding stone (20).

Substrate washing method and substrate washing apparatus

This invention relates to an expanded heat-insulating material containing a reduced amount of a fluorocarbon blowing agent for use in a freezer, refrigerator or the like. It is produced by stirring a mixture of a carbon dioxide adsorbent having a hydrophobic surface, a premix component containing water, and an isocyanate component. According to the expanded heat-insulating material thus produced, the amount of the fluorocarbon blowing agent to be used can be reduced since water is used as the blowing agent, while carbon dioxide generated by the reaction of the isocyanate with the water can be removed after foaming by adsorption with the carbon dioxide adsorbent, and the gas present in the bubbles becomes enriched with the fluorocarbon gas.

Expanded heat-insulating material

A bracket structure resistant to fatigue and a process of making same are shown. The structure can be useful for conveyances such as parts of automobiles; it comprises: a first and a second member joined together at a junction and extending out therefrom to form a gap between the resulting diverging surfaces; and a stressed gusset spanning the gap, the gusset having a first contact surface abutting said first member and second contact surface abutting said second member, the first contact surface being affixed to said first member, the second contact surface being in vibration-dampening frictional contact with said second member due to the stress on said gusset. Steel members and a steel gusset are preferred, together with a plug-welded connection of the first contact surface to the first member.

Friction-dampened gusset

PURPOSE:To obtain a stainless steel for coloring having uniform surface potential by cold-rolling austenitic stainless steel, and subjecting the cold-rolled steel plate to bright annealing in a gaseous atmosphere of specified compsns. of N2/H2 under controlled dew point of the atmosphere gas. CONSTITUTION:After cold rolling of austenitic stainless steel, said steel is subjected to bright annealing at 800-1,200 deg.C in a gaseous atmosphere contg. 1/1- 1/3 N2/H2. Here the steel plate is subjected to the bright annealing for a specified time while the compsns. and temp. of the atmosphere gases are maintained respectively constant within the above-mentioned ranges. Further the dew point of the atmosphere gases during the annealing is controlled to + or -3 deg.C in a -35- -65 deg.C range. By this method the components of the surface layer of the steel plate are made uniform, the surface potential is made uniform and the stainless steel for coloring free from generation of uneven coloring in chemical coloring is obtained.

Production of stainless steel for coloring

PURPOSE:To absorb the vibration of a pressing member by a method wherein a second member which is linked with the pressing member slides shakily on the first member fixed on the surface of a cylinder. Dry friction between both the members absorbs vibrational energy from the pressing member. CONSTITUTION:A first member 5 which is a component having a trapezoidal groove in cross section is fixed on the outer peripheral surface of a cylinder body 1. A second member 6 which is of the same shape as the confronting groove and can fit in the trapezoidal groove with slight gaps is connected with a pressing member 4 through links 8, 10, 11, 13. As the mechanism is operated, the pressing member 4 vibrates but the vibration of the pressing member 4 can be suppressed by absorption of the vibrational energy because dry friction acts on the slanted contacting surfaces between the member 6 and member 5.

Vibration absorbing type press cylinder

Running orbit of urban traffic system

PURPOSE:To facilitate the damping of a structure, by allowing a plurality of plates arranged in a hollow part of a mechanical structure to come in contact with each other and to move relatively in the dry state thereby damping vibrations. CONSTITUTION:A bed 1 is formed with the hollow part 2 therein, two fixed plates 3 are secured to the bottom surface 2a with a space therebetween, and three depending plates 4 are hung from a ceiling surface 2b with the plates 4 in contact with the surfaces of the fixed plates 3. When a shock is applied from outside, friction occurs between the contacted surfaces of the fixed plates 3 and the depending plates 4 in the dry state due to the slight vibrations, so that the vibration energy is converted into heat energy and therefore the vibrations can be absorbed and damped.

Apparatus for damping vibration of mechanical structure

PURPOSE:To absorp vibration and prevent a noise, by providing a groove on the peripheral part of the body of a feeder made of an electric conductor and by filling a vibration absorber in the groove. CONSTITUTION:A feeder comprises a feeder body 21 made of an electric conductor of prescribed electric conductivity and a vibration absorber 23 filled in a groove 22 provided on the peripheral part of the body 21. The cross section of the feeder body 21 is shaped as U. A sliding surface 24 for a pantograph shoe is provided on the bottom of the body 21. The groove 22 is located in the body 21. The body 21 is made of iron alloy, aluminum alloy or the like. A solid material such as concrete, a high-molecular substance such as rubber or the like is used as the vibration absorber 23. The feeder is vibrated because a pantograph slides thereon. A solid vibration sound is made by the vibration. Since the vibration energy of the feeder is absorbed by the absorber 23, the magnitude of the vibration is lowered. This results in greatly reducing the solid vibration sound of the feeder itself.

Feeder for transport facilities

PURPOSE:To improve a dynamic stiffness incremental effect as well as to reduce the cost of machining and assembling operations, by installing a form-memory alloy-make intermediate material provided with a curved surface interposingly in an engaging part between elements making up a structure. CONSTITUTION:A form-memory alloy-make intermediate material 8 provided with a curved surface is interposingly installed in position between a roll 1 and a friction damping element 2'. With this constitution, at a contacting part C between the roll 1 and the friction damping element 2' and the intermediate material 8, both these members are surely made contact with each other whereby a dynamic stiffness incremental effect grows large, while troublesome operations for machining and assembling can be eliminated, so that the cost of machining and assembling operations can be reduced.

Katayama Keiichi

Papers

Vibration absorbing type press cylinder

Running orbit of urban traffic system

Apparatus for damping vibration of mechanical structure

Feeder for transport facilities

Dynamic stiffness incremental structure