86results about How to "Compensation for shrinkage" patented technology

A dental article is fabricated from an SMC material using three-dimensional data captured from natural dentition to guide a computer-controlled milling machine. The three-dimensional data may include scans of an original tooth structure and a prepared tooth surface to characterize all surfaces of a dental article, or certain features may be created within a computer-assisted design environment taking account of occlusion, proximal contacts, and the like. In addition the model applied to a computer-controlled milling machine may account for shrinkage of the SMC material during any post-milling curing steps in order to ensure an accurate fit to the prepared tooth surface.

An object of the present invention is to prevent the deterioration of a TFT (thin film transistor). The deterioration of the TFT by a BT test is prevented by forming a silicon oxide nitride film between the semiconductor layer of the TFT and a substrate, wherein the silicon oxide nitride film ranges from 0.3 to 1.6 in a ratio of the concentration of N to the concentration of Si.

The invention relates to a low-shrinkage early-strength type mine filling cementing material. The cementing material comprises the following components in percentage by weight: 50-90% of slag powder, 5-25% of cement or cement clinker, 1-30% of mineral additive, 0-10% of gypsum, 0.5-10% of alkali activator and 0.1-10% of shrinkage-reducing and cracking-resistant material. The invention solves the problem that fillers are prone to high shrinkage, cracking, slow setting and low strength when a slag-based alkali activation material is used for full tailing filling of a mine and the concentration of filling slurry is low especially in case of improper curing. The material is used instead of cement for mine filling, has favorable adaptability for tailings of different concentrations (55-80%), and has the advantages of fast filler setting, high strength and low shrinkage.

The invention discloses micro-expansion fiber reinforced concrete for a steel-concrete combined beam bridge panel wet joint and a preparation method of the micro-expansion fiber reinforced concrete, and relates to the preparation field of the micro-expansion fiber reinforced concrete. The micro-expansion fiber reinforced concrete comprises gel materials (cement, coal ash, slag powder and an expanding agent), aggregate, reinforcing materials, imitated steel fibers, a water reducer and water, wherein the 28 compressive strength of the micro-expansion fiber reinforced concrete is not lower than 69.0MPa, the 28d breaking strength of the micro-expansion fiber reinforced concrete is not lower than 7.0 MPa, the 28d splitting tensile strength of the micro-expansion fiber reinforced concrete is not lower than 5.0 MPa, the 28d elasticity modulus of the micro-expansion fiber reinforced concrete is not lower than 36.0 GPa, the cracking resistance level of the micro-expansion fiber reinforced concrete reaches L-IV level, the 28d bending toughness index I20 of the micro-expansion fiber reinforced concrete is not lower than 8, the 56d chlorine ion diffusion coefficient of the micro-expansion fiber reinforced concrete is lower than 4.0*10<-12>m<2>/s, the 21d shrinkage percentage of the micro-expansion fiber reinforced concrete is lower than 200*10<-6>. By using the preparation method, the shrinkage cracking of the micro-expansion fiber reinforced concrete can be effectively avoided, so that the reinforced concrete is relatively compact. The micro-expansion fiber reinforced concrete disclosed by the invention is relatively high in strength, relatively low in shrinkage percentage, good in bending toughness and durability, relatively low in cost and conveniently to widely use.

The invention belongs to the technical field of concrete engineering, and in particular relates to a composition for inhibiting concrete alkali-aggregate reaction and a preparation method thereof. The composition for inhibiting the concrete alkali-aggregate reaction comprises the following compositions: 10 to 50 percent of plasticizing agent, 10 to 70 percent of aluminate and 10 to 30 percent of alkali metal salt or alkaline-earth metal salt, wherein the alkali metal salt or the alkaline-earth metal salt is selected from at least one group of lithium compounds, barium compounds or calcium-magnesium compounds, and the total content of various compositions is 100 percent. The composition can cover or coat active elements of aggregate, prevent or isolate contact reaction between alkali metal ions such as K<+> and Na<+> and the active elements of the aggregate, prevent generation of soluble swelled gel and generation of insoluble compounds, and further eliminate alkali-aggregate reaction and improve the durability of concrete.

A method of molding an ophthalmic lens product by using a mold assembly which has a mold cavity, the lens product having a configuration corresponding to that of an ophthalmic lens or a precursor of the ophthalmic lens and being obtained by polymerizing a liquid monomer composition in the mold cavity to provide a polymer product which gives the lens product, the method comprising the steps of: preparing the mold assembly having a monomer storage space for storing the liquid monomer composition, which storage space is held in fluid communication with the mold cavity; filling the mold cavity of the mold assembly with the liquid monomer composition while the liquid monomer composition is accommodated in the monomer storage space; and polymerizing the liquid monomer composition at a temperature of 10-80° C. while a pressure higher than the atmospheric pressure is applied directly to a liquid surface of a mass of the liquid monomer composition accommodated in the monomer storage space.

The invention belongs to the technical field of concrete admixtures, in particular to a concrete water-retaining agent, made from the following materials according to parts by weight: 30-50 parts of hydroxypropyl methylcellulose, 10-18 parts of diatomaceous earth, 5-15 parts of glyceryl monostearate, 3-15 parts of calcium sulfoaluminate and 2-10 parts of alkyl glycoside. The concrete water-retaining agent of the invention has high water-retaining rate and stable properties and can improve the strength, cracking resistance and durability of concrete.

A process for producing an electrical rated glove configured to fit the hand of an individual, comprising the steps of making a three dimensional image of the individual's hand; using an appropriately programmed computer to create a three-dimensional model from the image; using the three-dimensional model to create, through the three dimensional printer, a 3-dimensional glove former corresponding to the 3-dimensional image of the wearer's hand; dipping the glover former in a rubber to form a rubber glove on the former corresponding to the shape to the glove former, thus corresponding to the wearer's hand. In another aspect, the process comprises making a three dimensional image of and individual's hand; constructing a mold based upon the three dimensional image of the hand; molding a glove former in the mold; and forming a rubber glove on the glove former.

The invention discloses steel slag sulphoaluminate-based expanding type base layer stabilization special cement, which is prepared from the following ingredients in parts by weight: 10 to 45 parts of steel slag, 20 to 60 parts of portland cement clinker, 10 to 25 parts of sulphoaluminate cement clinker and 3 to 15 parts of gypsum. The portland cement clinker and the sulphoaluminate cement clinker are used in a compound way; solid wastes such as the steel slag and the gypsum are effectively used; the initial setting time of the cement material is greater than or equal to 6h; the final setting time is smaller than or equal to 10h; the 7-day linear expansivity is greater than or equal to 0.15 percent; the 28-day free expansivity is smaller than or equal to 1.0 percent; after popularization and application, the important significance is realized for promoting the comprehensive utilization of the steel slag and improving the anti-cracking performance and the strength of a pavement base layer; meanwhile, the cement production cost is effectively reduced.

A holographic recording medium 10 is configured to have a recording layer 12 on which information can be recorded as holograms; and first and second heat generating layers 14A and 14B provided in a pair so as to sandwich the recording layer 12. Then, the first and second heat generating layers 14A and 14B are allowed to generate heat by being irradiated with a heat generating laser beam LB3 having a wavelength that is different from that of a signal beam LB1 or a reference beam LB2 for reproducing or recording information. The holographic recording medium and a method for recording and reproducing the same, and a recording and reproducing apparatus can compensate for shrinkage of the recording layer due to recording or variations in temperature, thereby allowing for reproduction of the holograms under optimum conditions.

The invention discloses environment-friendly decoration cement and belongs to the technical field of building materials. The environment-friendly decoration cement is prepared from the following raw materials in parts by weight: 45-60 parts of Portland cement, 0-4 parts of an expanding agent, 4-10 parts of metakaolin, 2-6 parts of silicon powder, 1-3 parts of crystal whiskers, 5-10 parts of redispersible emulsion powder, 1-2 parts of a water reducer, 0.3-1.0 part of a defoaming agent, 0.1-0.15 part of cellulose ether, 5-10 parts of ground calcium carbonate and 10-15 parts of an environment-friendly material. The environment-friendly decoration cement disclosed by the invention has no problems such as alkali efflorescence and cracking and has good peaceability, corrosion resistance and environment-friendly performance.

A method for manufacturing a post insulator. A core is introduced into a tube of an insulating stiff material while leaving a small circumferential space separating the core and inner walls of the tube. Adhesive is introduced under an overpressure into an interior of the tube and is cured while maintaining an overpressure in the interior of the tube.

A low-temperature ball valve comprises a valve body (10), a ball spool (20) and a valve rod (30). Axis of the valve rod (30) is coaxial with a rotary axis of the spool (20) and is fixedly connected with the spool (20). One end of a tubular support (40) is fixed on the valve body (10) and coaxially sleeved on the valve rod (30) to support the valve rod (30). A gap is reserved between the valve rod (30) and the tubular support (40). A decompression passage for communicating the gap with a through hole (21) is further arranged. In the prior art, the decompression passages of the low-temperature ball valves discharges hazardous gases during decompression and is high in cost. The low-temperature ball valve is environment-friendly and low in cost.

The invention discloses self-compacting concrete applicable to the joint section of a steel structure concrete composite beam. The concrete is prepared from the following components in parts by mass:100 to 150 parts of water, 450 to 500 parts of cement, 50 to 55 parts of a mineral admixture, 675 to 725 parts of fine aggregate, 1000 to 1100 parts of coarse aggregate, 5 to 10 parts of a high-performance polycarboxylate superplasticizer and 50 to 55 parts of a composite expanding agent, wherein the cement is ordinary Portland cement with a grade of 42.5 or above; the mineral admixture is fly ashwith a grade of national standard I or above; the fine aggregate is natural medium sand or machine-made sand; the coarse aggregate is broken stone with a particle size of 5-25 mm; the water reducingrate of the high-performance polycarboxylate superplasticizer has to be 25% or above. According to the invention, automatic compaction and no shrinkage of concrete in the joint section of a hybrid beam are realized; and the concrete has stable working performance and mechanical performance, and can be applied to concrete structure construction under occasions like construction space is narrow, only self-compaction concrete pouring can be adopted and concrete can only be conveyed from the outer side.

The invention belongs to the field of alkali-activated inorganic nonmetal cementing materials, and particularly relates to an alkali-activated cementing material doped with high-silicon iron tailings and red mud and a preparation method of the alkali-activated cementing material. The material comprises the following raw materials: 30 to 50 parts of high-silicon iron tailings; 15 to 20 parts of red mud; 20 to 35 parts of coal gangue; 10 to 15 parts of alkaline residues; and 1-5 parts of an alkaline activator. The preparation method comprises the following steps: adding the high-silicon iron tailings, the red mud and the coal gangue into a stirrer, performing uniform stirring, dissolving the alkaline residues into the alkaline exciting agent, adding the mixture into the stirrer after the alkaline residues are completely dissolved, performing stirring and mixing at a low speed, pouring the standard sand into a stirring pot, stopping stirring, and performing stirring again to obtain alkali-activated cementing material slurry; injecting the obtained alkali-activated cementing material slurry into a mold, carrying out coagulation and hardening to remove the mold, and performing curing in a curing device to obtain the target product. The concrete is good in gelling property, ideal in impermeability and high in compressive strength, and has a micro-expansion compensation function.

The invention discloses light-weight anti-corrosion concrete for a light steel structure wall body and a preparation method thereof, and relates to the technical field of a building material. The light-weight anti-corrosion concrete for the light steel structure wall body is prepared from the following ingredients in parts by weight: 170 to 190 parts of ordinary Portland cement, 114 to 139 parts of fly ash, 35 to 50 parts of expanding agents, 0.5 to 1.0 part of hydroxypropyl methyl cellulose, 0.8 to 1.2 parts of redispersible powder, 8.5 to 9.5 parts of EPS particles, 3.7 to 4 parts of water reducing agents and 135 to 140 parts of water. The concrete provided by the invention has the advantages that the concrete cracking is reduced; the moisture seepage is prevented; the sulphate corrosionresistance is realized.

The invention discloses a self-flowing castable prepared from blast furnace iron runner cover waste and a preparation method thereof. The self-flowing castable is prepared from the following components in parts by mass: 15-25 parts of iron runner cover waste, 30-60 parts of brown fused alumina clinker, 10-20 parts of white fused alumina, 15-25 parts of silicon carbide, 4-9 parts of silica powder,5-10 parts of activated alumina powder, 3-8 parts of pure calcium aluminate cement, 3-5 parts of an expanding agent, 0.5-1 part of a water reducing agent and 0.05-1 part of an anti-explosion agent. The preparation method of the self-flowing castable comprises the following steps: selecting materials, crushing, screening, mixing, packaging and warehousing. According to the invention, the waste blast furnace iron runner cover material is recycled, the production cost is reduced, the compactness and strength of the castable after pouring are improved, the erosion resistance is enhanced, the service life of the iron runner cover is prolonged, and the preparation method is simple and suitable for industrial popularization.

The invention relates to a method of welding a laminate for the production of flexible tubular plastic bodies, which method comprises the following operations:

• • a laminate is shaped around a welding rod;
  • the ends of the laminate to be welded are heated;
  • said ends are pressed together and at least partly cooled;
  • the welded zone is deformed so as to increase its area; and
  • the welded zone is cooled.

The invention also relates to a device suitable for using the aforementioned method.