The Furukawa Electric Co., Ltd.

Takashi Shimano

Katsumi Orimo

Shoji Yamamoto

Misao Sakano

Shinichi Mukoyama

Masao Azuma

Yoshimasa Masukata

Hiromitsu Sato

Superconducting accelerating tube comprised of half-cells connected by

A superconducting accelerating tube which is constructed in a manner such that a plurality of components, formed of a superconducting material and individually having peripheral end portions adapted to be butted to one another, are butted to one another at the peripheral end portions, and the butting portions butted to one another are welded together. In the superconducting accelerating tube according to the present invention, the butting portions are welded by means of a laser beam, and the laser beam is applied to the butting portions so that the components are laser-welded to one another. Preferably, the accelerating tube is designed so that at least only the respective inner surfaces of the butting portions are laser-welded, and the depth of welding is not greater than half the thickness of the superconducting material and not smaller than 150 .mu.m.

Superconducting accelerating tube and a method for manufacturing the same

This invention relates to a process of producing a foamed plastic insulated conductor. This process comprises the steps of forming a foamed insulation on a conductor wire by means of a gas injecting extruder and passing said conductor wire having said foamed insulation through telescopic cooling trough means including a movable trough to be adjusted in its position relative to a head of said gas injecting extruder so as to obtain a given value of a capacitance of the foamed plastic insulated conductor in accordance with an electrical signal from a capacitance monitor to detect a value of said capacitance of the foamed plastic insulated conductor. The process of the invention is characterized by further comprising the steps of detecting the position of the movable trough adjacent to its critical or limit positions and adjusting the injection rate of the foaming gas so as to move the movable trough to the middle position of the range of movement thereof. This invention also relates to an apparatus for effecting the above-mentioned process.

Process of producing a foamed plastic insulated conductor and an

An infinitesimal gas flow regulator has a valve seat member having a valve seat provided at a gas inlet thereof, and a valve body including a hemispheric portion seated on the valve seat so that said valve body is rollingly movable about the center of the hemispheric portion while the valve body is kept on said valve seat. The valve body has an orifice in the form of a notch provided in the hemispheric portion of said valve body. An adjusting screw is provided to adjust the position of the valve body about the center of the hemispheric portion whereby a predetermined degree of opening is provided to the orifice in the valve body.

Infinitesimal gas flow regulator

This invention generally pertains to a process for producing a foamed thermoplastic resin article by utilizing the phenomenon that a solid thermoplastic resin sorbs a gas under pressure, and more particularly to a process for producing a foamed thermoplastic resin article comprising the steps of making a solid thermoplastic resin containing a nucleating agent quickly sorb a gas under a high pressure P.sub.1, lowering said gas pressure to a low pressure P.sub.2 (P.sub.1 &gt; P.sub.2 &gt; the atmospheric pressure) when the gas sorption quantity reaches a predetermined value so as to equilibrate or stabilize said predetermined gas sorption quantity, feeding said gas sorbed thermoplastic resin into an extruder while said gas pressure is maintained at said low pressure P.sub.2 and extruding the resultant resin to thereby produce a foamed thermoplastic resin article. In this invention, the gas sorbed by the thermoplastic resin contributes to foam in the thermoplastic resin.

Process for producing a foamed thermoplastic resin article

An apparatus for producing a foamed thermoplastic resin comprising an extruder including a barrel through which a thermoplastic resin is fed while being melted and a head to extrude said molten resin from said barrel, and gas injector means to inject a gas into said molten resin in said barrel through a gas injecting port in said barrel whereby said foamed thermoplastic resin article is formed by extruding said gas containing molten resin, said gas injector means characterized by comprising a gas metering means or gas flow rate setting means disposed adjacent and connected to said gas injecting port to conduct said gas therethrough while a constant flow rate is maintained, and a volume of a gas passage from said gas flow rate setting means to said gas injecting port in said barrel being sufficiently set for the gas pressure in said gas passage to respond to variation in the pressure of said molten resin in said barrel.

Growing community of inventors

Yokohama, Japan

Takashi Shimano