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176results about How to "Good balance" patented technology

Polypropylene-base resin composition and products of injection molding thereof

InactiveUS6441081B1Good balanceExcellent injection moldabilityFilm/foil adhesivesPolypropyleneTalc
A polypropylene resin composition which comprises:(1) 55 to 75% by weight of (A) a polypropylene resin consisting of a mixture of the following polymers (i) and (ii):(i) a propylene-ethylene block copolymer having a propylene homopolymer part which is the first segment and having a propylene-ethylene random copolymer part which is the second segment and(ii) a propylene homopolymer having an intrinsic viscosity [eta]P of 0.8 to 1.8 dl/g as measured in tetralin at 135° C.,(2) 21 to 30% by weight of (B) an ethylene-1-octene copolymer rubber having a melt flow rate (JIS-K-6758 at 190° C.) of 2 to 10 g/10 min and having a 1-octene component content of 20 to 25% by weight, and(3) 5 to 20% by weight of (C) talc having an average particle diameter of not more than 3 mum, wherein when the amount of the second segment contained in the propylene-ethylene block copolymer of the polypropylene resin (A) is designated as (A)' and the ethylene-1-octene copolymer rubber content is designated as (B)', the following expression is satisfied:and when the above composition is subjected to a tensile test according to ASTM D638, it exhibits, an ultimate elongation of at least 400%, and the melt flow rate (JIS-K-6758 at 230° C.) of the composition is at least 30 g/10 min, and an injection-molded article obtained by injection molding the above polypropylene resin composition.
Owner:SUMITOMO CHEM CO LTD +1

High-speed pantograph head

The invention discloses a high-speed pantograph head, comprising a sliding plate, small bow angles, large bow angles and a frame-shaped spring, wherein the section of the sliding plate is in a stream line form, the lower part of the sliding plate is an elongated sliding plate slot, the slot is embedded with carbon slide blocks or other materials, the frame-shaped spring is connected below the sliding plate by virtue of a bracket, the front end of the frame-shaped spring is connected with the sliding plate by virtue of a support and the bracket, the rear end of the frame-shaped spring is hinged with the upper frame of a pantograph, and a group of large bow angles are inserted and fixed in a hinge at the upper end of the upper frame of the pantograph. Under the coordination of a pantograph balanced beam, the frame-shaped spring can always maintain the sliding plate of the pantograph to be parallel to a guide rail plane, and the sliding plate can be always in close contact with a contact wire under the regulating action of the bracket. The structure of the pantograph head is simple, the weight is light, the air resistance when the pantograph head moves, the impact resistance is high, the current of the pantograph at a high speed is favourable, the current of the pantograph of a train on a conventional railway or a light railway can be improved.
Owner:CENT SOUTH UNIV
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