35results about How to "Small residual strain" patented technology

The invention relates to a tilt angle sensor based on optical fiber Bragg gratings and a method for measuring a tilt angle of the tilt angle sensor and belongs to the technical field of measurement of a structural tilt angle. The tilt angle sensor comprises a fixed base plate (12), a fixed pressing block (6), a thin-wall type uniform-section metal beam (9) and a quality block (7), wherein the upper end of the thin-wall type uniform-section metal beam (9) is arranged on the fixed base plate (12) in a mode of fitting with the fixed pressing block through a first movable pressing block (10) and a fifth screw (11); the quality block (7) is fixed at the lower end of the thin-wall type uniform-section metal beam (9) through a sixth screw (15) and a second movable pressing block (16); and a first optical fiber Bragg grating (13) and a second optical fiber Bragg grating (14) are respectively adhered to opposite positions on two sides of the thin-wall type uniform-section metal beam (9). By the method, the size and direction of the tilt angle can be detected according to a correspondence relation between the change of central wavelengths of the two optical fiber Bragg gratings and the tiltangle. The invention is high in measurement accuracy and has a temperature self-compensation function.

A polypropylene based nonwoven fabric is excellent in surface appearance and stretch properties and exhibits a small residual strain and excellent adhesiveness to polyolefins. The nonwoven fabric is obtained by forming a polypropylene resin composition comprising 1 to 40 weight parts of (i) an isotactic polypropylene, and 60 to 99 weight parts of (ii) a propylene/ethylene/α-olefin copolymer obtained by copolymerizing 45 to 89 mole % of propylene, 10 to 25 mole % of ethylene and the balance of α-olefin having 4 to 20 carbon atoms (with the proviso that the copolymerized amount of the α-olefin having 4 to 20 carbon atoms does not exceed 30 mole %), characterized by a small residual strain after stretching at a stretch ratio of 150%. The nonwoven fabric can be effectively used as sanitary materials or the like by virtue of its characteristics including stretch properties.

This invention is a conductive elastic roller (1) comprising a shaft member (2) and one or more elastic layers (3) disposed on an outside of the shaft member (2) in a radial direction, wherein at least one of the elastic layers (3) is composed of an ultraviolet-curing type resin formed by curing a raw material for the elastic layer comprising a urethane acrylate oligomer (A), a photo-polymerization initiator (B) and a conductive agent (C) through ultraviolet irradiation, and the urethane acrylate oligomer (A) is a urethane acrylate oligomer synthesized by using as a polyol a polyether polyol (a1) having a proportion of primary hydroxyl groups in hydroxyl groups located at molecular ends of not less than 40% obtained by an addition polymerization of propylene oxide to a polyhydric alcohol alone, or the polyether polyol (a1) and another polyol (a2), and provides a conductive elastic roller (1) provided with an elastic layer having a low hardness, a small compression residual strain and an improved stain resistance to an adjoining member such as Organic Photoconductors or the like.

Objects of the invention are to obtain ethylene copolymers which have excellent rubber elasticity even without being crosslinked and maintain sufficient shaping processability even when filled with significantly large amounts of additives, and to provide methods for producing with good productivity films or sheets having flexibility and high stretchability. The invention is directed to an ethylene copolymer (X) including structural units derived from a component [A], a component [B] and a component [C] which are ethylene [A], an α-olefin of 3 to 20 carbon atoms [B] and a polyene and/or a cyclic olefin [C]. In the ethylene copolymer, (1) the content of structural units derived from the ethylene [A] is in the range of 50 to 90 mol % in 100 mol % of all the structural units in the copolymer (X); (2) the content of structural units derived from at least one polyene and/or the cyclic olefin [C] is in the range of 1.0 to 5.0 mol % in 100 mol % of all the structural units in the copolymer (X); and (3) the intrinsic viscosity [η] of the ethylene copolymer (X) as measured at 135° C. in a decalin solution is in the range of 7.8 to 13.0 dl/g. The invention also concerns with a composition including the ethylene copolymer (X), and uses.

The invention discloses a processing method of a nickel-titanium shape memory alloy high-strength wire material. The processing method comprises the following steps that (1), a nickel-titanium alloy wire blank is subjected to peeling treatment, and the nickel-titanium alloy thick wire material is obtained; (2), the nickel-titanium alloy thick wire material in the first step is subjected to hot drawing, and the thick wire material in the nickel-titanium alloy is obtained; and (3), high-temperature annealing and water quenching are carried out on the thick wire material in the nickel-titanium alloy in the second step; (4), cold drawing and on-line annealing treatment are carried out on the thick wire material in the high-temperature annealed and water-quenched nickel-titanium alloy obtainedin the third step, and the nickel-titanium alloy fine wire material is obtained; and (5), on-line aging treatment and peeling treatment are carried out on the nickel-titanium alloy fine wire materialobtained in the fourth step, and the nickel-titanium shape memory alloy high-strength wire material is obtained.

The invention discloses a Cu-Al-Mn shape memory alloy damping device for a precise instrument and a manufacturing method of the Cu-Al-Mn shape memory alloy damping device. The damping device comprises a workbench, a damping assembly and a base. The damping assembly connects the workbench with the base. The damping assembly is composed of a plurality of columnar crystal tissue Cu-Al-Mn shape memory alloy plates with high anisotropism. The Cu-Al-Mn shape memory alloy damping device has the advantages that the damping device has the functional anisotropism, in other words, 10% or more high recovery strain can be provided in the vertical direction, the damping performance is superior, and good energy absorbing and damping functions are achieved; 7% or more high recovery strain in the horizontal direction can be provided, the energy absorbing and damping functions are achieved, and due to higher strength and rigidity of plates in the thickness direction, the damping device has good inclination resisting and shaking resisting functions, and the precise instrument can be kept stable in the using, or moving or transporting process.

A fiber mixture according to the invention comprises fibers A comprising a polymer A containing a thermoplastic polyurethane elastomer and fibers B comprising a thermoplastic polymer B other than the thermoplastic polyurethane elastomer, said thermoplastic polyurethane elastomer having a solidifying point of 65 DEG C or above as measured by a differential scanning calorimeter (DSC) and containing 3.00x10<6> or less polar-solvent-insoluble particles per g counted on a particle size distribution analyzer, which is based on an electrical sensing zone method, equipped with an aperture tube having an orifice of 100 mu m in diameter. An elastic nonwoven fabric comprises the fiber mixture.

A (meth) acrylic resin composition containing at least 99.5% by mass (meth) acrylic resin including 80%-100% by mass of a structural unit derived from methyl methacrylate and 0%-20% by mass of a structural unit derived from acrylic ester; having a difference of no more than 3 between a yellow index (YI4) at an optical path length of 200 mm in an injection-molded article obtained at a cylinder temperature of 280°C and a molding cycle of 4 minutes, and a yellow index (YI1) at an optical path length of 200 mm in an injection-molded article obtained at a cylinder temperature of 280°C and a molding cycle of one minute; and having a melt flow rate of at least 25g/10 mins. under conditions of 230°C and a 3.8 kg load.

An expanded porous polytetrafluoroethylene film having residual strain of at most 11.0% as measured after a load required to indent a rod, which is in a columnar form that its outer diameter is at least 2 mm and at least 1.9 times as much as the thickness of the film, and has a smooth plane perpendicular to its axis at a free end surface thereof and a modulus of longitudinal elasticity of at least 1.0×10⁴ kgf/mm², up to 20% of the film thickness at a strain rate of 100%/min from the free end surface is applied repeatedly 20 times, and a production process of the porous film, in which a step of compressing an expanded porous polytetrafluoroethylene film having a high draw ratio is provided.

First corrugated portions in a first direction are sequentially formed by die-pressing a raw metal plate. Second corrugated portions formed in a second direction intersecting the first direction are sequentially formed by die-pressing a primary formed plate having the first corrugated portions using elongate projections, so that each of the second corrugated portion has a half-height and a pitch larger than those of each of the first corrugated portion. Third corrugated portions formed approximately in the first direction are sequentially formed by die-pressing a secondary formed plate having the second corrugated portions using elongate projections, so that each of the third corrugated portions has a half-height and a pitch larger than those of the first corrugated portion.

The invention discloses a manufacturing method of a fine-grain NiCr20TiAl alloy forged material, which comprises the following steps: in the smelting process, controlling the C element to be 0.06-0.10%, controlling the Cr element to be 20.0-22.0%, and adding 0.15-0.50% of Mo element at the same time; the vacuum induction melting and electroslag remelting ingot is subjected to a high-temperature homogenization heat treatment process, so that the C, Cr and Mo elements are uniformly diffused; and the heating temperature and the deformation time of the final heating number are controlled during forging. Through the measures, the NiCr20TiAl alloy forged material produced through the method can eliminate the grain coarsening tendency during subsequent high-temperature solution treatment, the forged material is subjected to solution heat treatment at the temperature of 1050-1080 DEG C for 8 h, the average grain size can obtain five-level fine grains or a better level, and meanwhile the forged material has good obdurability after aging treatment.

To provide a resin composition which is suitable for use as a material for optical parts and disk substrates and molded products thereof. The resin composition comprises: (1) 10 to 90 wt % of a first hydrogenated, polymerized styrene which contains a hydrogenated, polymerized styrene unit in an amount of more than 95 wt % and 99.99 wt % or less and has a weight average molecular weight of 30,000 to 300,000; and (2) 10 to 90 wt % of a second hydrogenated, polymerized styrene which contains a hydrogenated, polymerized styrene unit in an amount of 60 to 95 wt % and has a weight average molecular weight of 30,000 to 200,000, “wt %” being based on 100 wt % of the total of the first hydrogenated, polymerized styrene and the second hydrogenated, polymerized styrene.

The invention relates to a 1300Mpa grade high tenacity cold-formed steel plate and a production method thereof and belongs to the technical field of metallurgy. The steel plate comprises the chemical components in percent by mass: 0.1-0.2% of C, 1.8-2.5% of Mn, less than or equal to 0.005% of S, less than or equal to 0.02% of P, 1.0-1.5% of Si, less than or equal to 0.08% of Als, 0.01-0.04% of Nb, 0.02-0.08% of Ti, 1.0-2.0% of Ni and the balance Fe and inevitable impurities. The production method comprises the following steps: steelmaking, continuous rolling, heating, rolling, pickling, continuous annealing and level pulling straightening. A temperature of a soaking zone in the continuous annealing step is 760-820 DEG C, and an insulating time is 60-225s. The yield strength of the steel plate is greater than or equal to 850 MPa, a tensile strength is greater than or equal to 1300 MPa, and a ductility A50 is greater than 8%. The steel plate has a good cold-forming property and meets a requirement on light weight steel for an automobile.