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

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.

There is provided 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.

The object is to provide a thermoplastic polyurethane tape having an excellent elasticity function. The polyurethane tape is a thermoplastic polyurethane tape characterized by having a residual strain of 5 to 40% after stretching by 300% at 20 DEG C, preferably having a rate of recovery of 85% or higher after repeating the 300%-stretching / recovery cycle three times at -10 DEG C.

A spunbonded elastic nonwoven fabric according to the invention comprises fibers formed from a polymer comprising a thermoplastic polyurethane elastomer, wherein the thermoplastic polyurethane elastomer has a starting temperature for solidifying of 65° C. or above as measured by a differential scanning calorimeter (DSC) and contains 3.00×106 or less polar-solvent-insoluble particles per g as 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 μm in diameter, and wherein the fibers have diameters such that the standard deviation of fiber diameters (Sn) divided by the average fiber diameter (Xave) (Sn / Xave) gives a value of 0.15 or less.

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.

This production method of silicon carbide single crystal, for sublimating a silicon carbide raw material to grow a silicon carbide single crystal on a seed crystal substrate with a silicon carbide single crystal growth device provided with at least a growth vessel and a heat insulation vessel having a temperature measurement hole around said growth vessel, is characterized by measuring the temperature of the growth vessel through the temperature measurement hole during growth of the silicon carbide single crystal, and by blocking the temperature measurement hole with a shielding member when growth of the silicon carbide single crystal is complete and the silicon carbide single crystal is cooled. In this way, a production method and production device of a silicon carbide single crystal areprovided which decrease breakage and cracking of silicon carbide single crystal ingots and wafers.

A bone fixer able to be easily taken out is prepared from NiTi alloy through pre-treating, quenching at 780-830 deg.C, thermally mechanical treating with 0.2-0.3 strain for each deformation, bidirectional shape memory processing, cutting for shaping, and chemical polishing. It must be cooled at -6-10 deg.C before implantation or taking-out.

A methacrylic resin composition containing a methacrylic resin which contains 50-90mass% of structural units derived from methyl methacrylate and 10-50mass% of structural units derived from a methacrylic acid alicyclic hydrocarbon ester, wherein the difference between the yellowness index (YI4) at an optical path length of 200nm for an injection molded article obtained at a cylinder temperature of 280°C and a molding cycle of 4 minutes and the yellowness index (YI1) at an optical path length of 200nm for an injection molded article obtained at a cylinder temperature of 280°C and a molding cycle of 1 minute is 3 or less, and the melt flow rate at a temperature of 230°C and under a load of 3.8kg is at least 5g / 10mins.

A 1300Mpa-grade high-toughness cold-formed steel sheet and a production method thereof belong to the technical field of metallurgy. The chemical composition and mass percentage content of the steel plate are C: 0.1-0.2%, Mn: 1.8-2.5%, S≤0.005%, P≤0.02%, Si: 1.0-1.5%, Als≤0.08%, Nb: 0.01-0.04%, Ti: 0.02-0.08%, Ni: 1.0-2.0%, and the balance is Fe and inevitable impurities. The production method includes the steps of steelmaking, continuous casting, heating, rolling, acid rolling, continuous annealing, and leveling and leveling; the temperature of the soaking section of the continuous annealing step is 760-820 DEG C, and the holding time is 60-225s. The steel plate of the invention has a yield strength of ≥850 MPa, a tensile strength of ≥1300 MPa, and an elongation of A50 of ≥8%, has good cold forming performance, and meets the requirements of lightweight automobile steel.

A (meth)acrylic resin composition containing 99.5% by mass or more of a (meth)acrylic resin containing 80 to 100% by mass of methyl methacrylate-derived and 0 to 20% by mass of structural units derived from acrylate, the optical path length of the injection molded product obtained from the (meth)acrylic resin composition at a cylinder temperature of 280°C and a molding cycle of 4 minutes is 200mm The difference between the yellow index YI4 and the yellow index YI1 of the injection molded product with an optical path length of 200mm obtained at a barrel temperature of 280°C and a molding cycle of 1 minute is 3 or less, and the melt under the conditions of 230°C and 3.8kg load The flow rate is above 25 g / 10 minutes.

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.

The invention discloses a staggered splicing type steel plate-RPC anti-detonation door and a construction method thereof. According to the anti-detonation door, a cavity formed by a door leaf front side steel plate, a door leaf reverse side steel plate and a plurality of inner ribbed beams is filled with an RPC inner core. The construction method of the anti-detonation door comprises the steps that firstly, the door leaf front side steel plate, the door leaf reverse side steel plate and the inner ribbed beams are manufactured according to the size; secondly, the number of needed steel bars is calculated; thirdly, steel bar holes are formed in the inner ribbed beams in the length direction; fourthly, the door leaf front side steel plate is welded to the odd-number inner ribbed beams, and the door leaf reverse side steel plate is welded to the even-number inner ribbed beams; fifthly, the door leaf front side steel plate and the door leaf reverse side steel plate are spliced in a staggered manner, and the steel bars penetrate the steel bar holes; sixthly, reactive powder concrete is poured in the cavity formed by the door leaf front side steel plate, the door leaf reverse side steel plate and the multiple inner ribbed beams and is standing for 48 h; seventhly, the anti-detonation door is conveyed into a steam curing room at the temperature of 90 DEG C to be cured for 72 h; and eighthly, after 28 days, the RPC and the steel plates are effectively bonded to form the steel plate-RPC anti-detonation door. The staggered splicing type steel plate-RPC anti-detonation door and the construction method thereof are applied to anti-detonation protection projects.

A stretch-formed container having a layer comprising a blend of an ethylene terephthalate type polyester resin and another material, characterized in that the layer comprising the blend has a dispersion structure composed of a continuous phase comprising the ethylene terephthalate type polyester resin and a dispersed phase comprising the other material and that at least the container body part has a tand maximum temperature of 115 DEG C or lower in a dynamic viscoelasticity examination. Due to the constitution, even when the mechanical stretching rate reaches a limit, strain hardening effectively occurs. Thus, a stretch-formed container of a polyester resin can be provided which has both of excellent heat resistance attributable to high-temperature stretching and a stretch balance attributable to strain hardening.