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.

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.

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.