Abstract:
The purpose of the present invention is to provide: polyketone fibers having excellent strength and water resistance, which are manufactured from a polyketone solution prepared from a copolymer of carbon monoxide, ethylene, and propylene; and a manufacturing method therefor. The industrial polyketone fibers manufactured according to the present invention have excellent strength, elongation, water resistance, heat resistance, and thermal conductivity, and thus are suitable for the use in marine ropes, hoses, protective products, Geotextile, fibers for enhancing FRP composite materials, cables, fishing nets, air bags, heat insulators, seat belts, safety nets, roung sling, flying-quality film materials, non-woven fabrics, spun bonds, conveyor belts, flexible containers, fishing lines, sports cords, carbon fiber composite materials, longlines, carpets.
Abstract:
The present invention relates to a gaseous fuel supplying apparatus and a fuel cell system including same, wherein the gaseous fuel supplying apparatus has the structure of an integrated single unit to supply a gaseous fuel to each part of a fuel cell system. According to an embodiment of the present invention, the gaseous fuel supplying apparatus for supplying a gaseous fuel containing air and gas to a fuel cell system comprises: a gaseous fuel inlet section having an input port to receive the gaseous fuel through a blower; a flow division section allowing the gaseous fuel supplied through the gaseous fuel inlet part to be divided into a plurality of flow passages by means of a branch pipe having an orifice structure; a flow control section including a plurality of proportional control valves which are respectively installed on the flow passages of the flow division section to control the degree to which each flow passage is open; and a gaseous fuel outlet section including a plurality of output ports which respectively correspond to the plurality of proportional control valves.
Abstract:
The present invention relates to polyethylene terephthalate chips which have intrinsic viscosity from 0.8 to 1.3 and which are made by spinning multi-filament polyethylene terephthalate. The present polyethylene terephthalate fabrics for making air-bags have improved energy absorption capability which is induced by adjusting the polyethylene terephthalate fiber strength / deformation curve. To adjust the strength / deformation curve, multi- filament polyethylene terephthalate is subject to the following stresses: an initial stress of 1.0 g / d at room temperature with extensions of less than 4 %, followed by a medium stress of 4.5 g / d with extensions of less than 12 %, and up to at least 7 g / d tensile stress and right up to the point the fibers snap, such that the polyethylene terephthalate has elongation of 15% or more, carboxy terminus (CEG) content of less than 35 mmol/kg and fiber thickness of less than 5 denier.
Abstract:
The present invention relates to an apparatus for detecting partial discharge for electric power devices, comprising: an insulator having a predetermined shape; a receiving unit arranged inside or outside the insulator to receive signals of a plurality of sub-bands; and a connection electrode which transmits signals of a receiving electrode to a coaxial cable in conjunction with the connected coaxial cable.
Abstract:
The present invention relates to a spandex fiber of which the chlorine resistance is improved by comprising an inorganic chlorine resistant agent such as a hydrotalcite compound, a mixture mineral of huntite and hydromagnesite, hydromagnesite, zinc oxide, magnesium oxide and the like, and a symmetrically di-hindered hydroxyphenyl-based additive, and a preparation method thereof. Since the spandex fiber of the present invention has excellent chlorine resistance, it can be more effectively used in sports or leisure clothes such as swimwear and the like.
Abstract:
The present invention relates to a mobile seam welder and to a method for controlling the welding operation thereof. A mobile resistance seam welder of the present invention comprises an upper control unit (110) and a lower control unit (120) for synchronizing the movement speed of a mobile unit and the rotating speed of an upper disk electrode (101) and of a lower disk electrode (101'). The upper control unit (110) and the lower control unit (120) comprise: respective first measuring units (111, 121) for measuring the driving force (F1) produced by the friction force between the upper and lower disk electrodes (101, 101') and a welding target (m); respective second measuring units (113, 123) for measuring a force (F2) resistant to the rotation of the upper and lower disk electrodes (101, 101'); and first and second motor force determining units (114, 124) for determining the driving force (F3) of upper and lower servomotors (107, 107') such that a condition (F1>F2) in which the measured driving force (F1) is always bigger than the measured force (F2) is achieved in order to prevent slippage between the disk electrodes (101, 101') and the welding target (m). The first and second motor force determining units (114, 124) determine the driving force of the upper and lower servomotors (107, 107') such that the force (F2) resistant to the rotation of the upper and lower disk electrodes (101, 101') has a minimum value in accordance with the static friction force and kinetic friction force which are calculated by the torque values of the upper and lower servomotors (107, 107'). According to the present invention, the speed of the mobile unit and the speed of the disk electrodes are synchronized in spite of the variation in the outer diameters of the disk electrodes, to thereby maintain welding quality at a constant level and to thus improve welding performance.
Abstract:
The present invention relates to a method for separating and refining high purity 2,6-naphthalene dicarboxylic acid having an excellent color and purity of 99.9% or more by using crude 2,6-naphthalene dicarboxylic acid. And more particularly, the present invention relates to a method for separating and refining 2,6-naphthalene dicarboxylic acid, in which adjustment of pressure and temperature during multiple-step crystallization process enables controlling nucleation and the crystal growth rate, thereby allowing a particle size distribution and form to be controlled.
Abstract:
The present invention relates to a welding server and a welding management system. A welding server of the present invention comprises a first LAN card (104) and a second LAN card (102), wherein an application (110) for selecting one of said first LAN card (104) and said second LAN card (102) is provided. Further, if said first LAN card (104) is selected by said application (110), the welding server (100) reads IP information of welding control devices (200) connected to a network, and performs a grouping operation. In addition, the welding server (100) continuously communicates with communication-capable welding control devices (200), and collects and manages welding data and event information, and for communication-capable welding control devices (200), the welding server (100) searches for the communication-capable welding control devices by performing a continuous scanning operation. According to the present invention as mentioned above, the invention improves reliability in the management of welding quality, and prevents communication loads and the waste of resources that constitute the network.
Abstract:
The present invention relates to a spandex fiber which comprises hydrotalcite, mono-hindered hydroxyphenyl-based compounds, symmetrical di-hindered hydroxyphenyl-based compounds, and semicarbazide-based compounds or hindered amine-based compounds, thus achieving improved chlorine resistance and discoloration resistance. The present invention also relates to a method for preparing the spandex fiber. The spandex fiber of the present invention has superior chlorine resistance, and therefore may be effectively used in sports clothing and leisure wear such as swimsuits.
Abstract:
The present invention relates to a submerged hollow fiber membrane module that includes a partition membrane having a slanted slit-shaped opening, and thus capable of not only improving operating efficiency of a hollow fiber membrane module by accelerating the water flow, but also allowing easy discharge of highly concentrated raw water around the hollow fiber membrane to the outside of the module during a reverse wash process.