Topic
Pressboard
About: Pressboard is a research topic. Over the lifetime, 1123 publications have been published within this topic receiving 9089 citations.
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Patent•
25 Jun 2008
TL;DR: In this article, the authors proposed a utility model which combines a hydraulic proportional valve and a displacement sensor to control the thickness of the plate and precision during pressing the artificial board by press, and also has the advantages of improving the quality of the board and lowering the manufacturing cost.
Abstract: The utility model relates to a thickness control device which combines a hydraulic proportional valve and a displacement sensor, comprising a hydraulic proportional valve which can control an upper hot pressboard to move and a displacement sensor which can measure the distance between the upper hot pressboard and the lower hot pressboard The utility model can control the thickness of the finished plate and the precision during pressing the artificial board by press, and also has the advantages of improving the quality of the artificial board and lowering the manufacturing cost
4 citations
Patent•
21 Jan 1980
TL;DR: In this paper, a surge voltage arrester consists of at least one stack of nonlinear resistors which are enclosed in heat conductive insulating material and a duct for the discharge of gas parallel to the stack is a bush, made of laminated pressboard, which has openings in its wall, closed by a heat shrinkage polyethylene.
Abstract: Surge voltage arrester consists of at least one stack of nonlinear resistors which are enclosed in heat conductive insulating material. A duct for the discharge of gas parallel to the stack is a bush, made of insulating material such as laminated pressboard, which is also enclosed by the insulating material and has openings in its wall, closed by an insulating foil, such as heat shrinkage polyethylene. The pref. insulating material is a mixt. of porcelain chips and fine alumina particles, inside a ribbed porcelain tube. This prevents any direct contact of a short-circuit arc and of hot gases with the inside of the housing.
4 citations
Patent•
17 Apr 2013
TL;DR: In this article, a hot pressboard for the hot press is described, and the problem of scratches can be left on the surface of a decorating board easily by a traditional hot press board is solved.
Abstract: The utility model discloses a hot pressboard for a hot press. The hot pressboard for the hot press comprises a hot pressboard body (1) and a thermal cycle pipeline (2) which is arranged in the hot pressboard body (1) and used for heating and drying board materials and is characterized in that a stainless steel layer (3) is covered on the surface of the hot pressboard body (1). By means of the hot pressboard for the hot press, the problem that scratches can be left on the surface of a decorating board easily by a traditional hot pressboard and the problem that the decorating board is prone to breakage caused by high temperature on a part due to the fact that a traditional heat transfer board transfers heat unevenly when the decorating board is machined through a traditional hot press are effectively solved.
4 citations
01 Oct 2013
TL;DR: In this paper, the breakdown strength of two new mineral insulating oils and a pressboard immersing in these oils under different temperature has been systematically investigated, and it can be obtained that the break strength of oil increased with the increase of temperature whereas the oil-pressboard showed opposite tendency.
Abstract: AC-DC converter transformer is one of the most important equipments in the high-voltage D.C. transmission system. And the mineral insulating oil and pressboard immersing in oil are important insulation dielectrics used in AC-DC converter transformers. Thus, it is very significant to understand the dielectric properties of the mineral insulating oil and oil-pressboard. In this paper, the DC breakdown of two new mineral insulating oils and a pressboard immersing in these oils under different temperature has been systematically investigated. The oil and oil-pressboard was degassed and dehydrated before the test. In the testing progress, the test device of breakdown strength was protected by nitrogen and isolated from outside. The breakdown strength of two kinds of mineral insulating oil were tested at five temperatures with the range of 25-80°C, and the breakdown strength of pressboard immersed in both oil were also tested at three temperature with the same range. From the results, it can be obtained that the breakdown strength of oil increased with the increase of temperature, whereas the oil-pressboard showed opposite tendency. This paper enhanced the understanding of the breakdown strength for mineral insulating oil and pressboard immersed in oil, provided the theoretical and test basis to expand the engineering application of this mineral insulating oil and pressboard.
4 citations
23 Aug 2021
TL;DR: In this paper, a continuous fiber-optic-based Distributed Acoustic Sensing (DAS) system was used to detect and analyse partial discharge at the oil-pressboard interface.
Abstract: This paper investigates novel, initial experimentation in detecting and analysing Partial Discharge at the Oil-Pressboard interface using a continuous fibre-optic-based Distributed Acoustic Sensing (DAS) system. Discharge was successfully detected at a minimum of 223 pC despite the sample rate of DAS being lower than the spectra of acoustic emission. DAS presents multiple advantages over conventional Partial Discharge techniques including inherent localisation, immunity to electrical and magnetic noise, as well as much greater detection distances.
4 citations