Showing papers on "Pressboard published in 1989"
Patent•
15 Nov 1989
TL;DR: In this article, a machining machining tool with adjustable bit-regrinding strong cut-off lathe tool is described, and the utility model has the advantages of reasonable structure, firmness, regrinding blade and large adjusting range.
Abstract: The utility model discloses relates to the machining cutter, in particular to an adjustable bit-regrinding strong cut-off lathe tool, comprising a cutter body, a blade, a pressboard, a cutter support board, a countersunk head screw, a countersunkgasket and an inner hexagon screw. A swallow tail slide mechanism is arranged between the cutter body and the cutter support board, and the pressboard is composed of an upper pressing block and an upper pressboard. And a tooth-typed adjusting mechanism is arranged between the upper pressing block and the upper pressboard. So the utility model has the advantages of reasonable structure, firmness, regrinding blade and large adjusting range, and the extending length of the cutter support board can be adjusted according to the diameter size of the work piece.
2 citations
Patent•
18 Jan 1989
TL;DR: In this article, the authors propose a paper separator for paper transportation system, which mainly comprises a bracket, a rotating shaft, a pressboard, an elastic press board, a cam and elastic rubbing paper sheet, a crank, a driving pull rod, etc.
Abstract: The utility model relates to a paper separator for paper transportation system, which mainly comprises a bracket, a rotating shaft, a pressboard, an elastic pressboard, a cam and elastic rubbing paper sheet, a crank, a driving pull rod, a paper pile table, etc. The utility model has the advantages of simple structure, low lost, continuous and reliable operation, which can match with general paper transportation system and can realize the single sheet input of paper. With the utility model, a large amount of paper can be saved and the work efficiency can be improved.
1 citations
29 Oct 1989
TL;DR: In this paper, a Couette charger facility has been built to simulate flow electrification processes in transformers, where transformer oil fills the annulus between coaxial cylindrical electrodes that can be bare metal or transformer pressboard covered.
Abstract: A novel Couette charger facility has been built to simulate flow electrification processes in transformers, where transformer oil fills the annulus between coaxial cylindrical electrodes that can be bare metal or transformer pressboard covered Flow electrification charge density measurements as a function of inner cylinder speed have been performed using a newly developed absolute charge sensor (ACS) which brings a sample of fluid from the turbulent core into a Faraday cage and measures the total charge with no extraneous contributions from charge separated within the ACS itself Transient measurements with a step change in temperature have shown the charge density to change from an initial to a new steady-state value These charge density values depend on equilibrium moisture levels which in turn depend on the temperature For all oils tested thus far with bare metal and T4 pressboard, the oil charge density is positive, but with HiVal pressboard there are some moisture and temperature regimes where the charge polarity reverses The effects of transformer energization were also simulated by applying low-frequency (1 to 4 Hz) high voltages (field strength up to 18 kV/cm peak) across the cylinder of the Couette charger >
1 citations