359results about How to "Shrink evenly" patented technology

The invention discloses a method for manufacturing a surfacing composite wear-resistant steel plate, which comprises the following steps of: tiling a steel base plate on a water-cooled platform, and compacting the steel base plate by employing front and rear side compaction devices respectively; after a weld pass is welded, opening the front and rear side compaction devices, and conveying the steel base plate for a certain distance forward through a pinch roll device; and repeating the steps for surfacing, until a flat surfacing composite wear-resistant steel plate with a high-chromium alloy wear-resistant layer is obtained on the whole steel base plate. A piece of equipment for manufacturing the surfacing composite wear-resistant steel plate applied to the method for manufacturing the surfacing composite wear-resistant steel plate comprises a portal frame, a welding device, a rear side compaction device, a front side compaction device, a water-cooled platform, a pinch roll device and a frame, wherein the rear side compaction device is arranged on the rear side of the welding device; and the front side compaction device is arranged on the front side of a welding gun of the welding device. The composite wear-resistant steel plate welded through the manufacturing method is small in deformation and high in welding quality and is not limited to specifications.

An electric heater for pipeline is an electric heater used for heating the pipeline or the medium therein. A temperature control unit is composed of a SCM and a temperature sensor, also has two bush-shape metal endoconches. On the inwall side of the two metal endoconches is fixed with an electric heating pipe, also has two bush-shape molding heat-conducting layers made of heat conducting materials used in shrinking on the pipeline. The outerwall side of the molding heat-conducting layers is joint with the inwall side of two metal endoconches. Also provided are two bush-shape molding insulating layers joint with the outerwall side of the two metal endoconches, two bush-shape shell on the external surface of the two molding insulating layers. Also provided are the fixed links joining the heating module on the pipeline. The invention has the advantages of high thermal efficiency, convenient to assemble and disassemble and is widely used in a variety of pipeline heating occasions.

The invention discloses glass fiber air filter paper with high dust holding capacity, which is prepared from alkali-free glass fiber chopped strands and alkali-free glass fiber cotton in the diameter of 0.3-0.4 mu m, as well as an adhesive, wherein the glass fiber air filter paper comprises 3-8 parts by weight of the alkali-free glass fiber chopped strands and 92-97 parts by weight of the alkali-free glass fiber cotton, and the adhesive is a water repellent containing fluorocarbon. The invention further discloses a production process of the glass fiber air filter paper with the high dust holding capacity, and the production process comprises the following steps: firstly beating and dispersing raw material to obtain pulp, then performing wet process forming on the pulp to obtain wet paper, removing water in the wet paper, then performing two-sided sizing on the dehydrated wet paper, and finally drying to obtain a product, wherein the beating degree during beating is 52-56 degrees SR, suction dehydration is performed in three stages, and drying treatment is performed in four stages. The glass fiber air filter paper disclosed by the invention has the advantages of smooth and uniform surface, large specific surface area and dust holding capacity, high mechanical strength and resistance to acid and alkali corrosion.

The invention discloses a preparation method of a heat shrinkable polyester film. The method comprises the following steps of: carrying out esterification and condensation polymerization reaction on multi-component dicarboxylic acid and multi-component dihydric alcohol in the presence of a catalyst, a stabilizing agent, an antistatic agent, a chain extender, an anti-caking agent or a modifying agent to prepare a multi-component polyester; carrying out melt extrusion, extension and pelleting on the multi-component polyester to prepare a multi-component polyester slice; and carrying out melted extrusion, die head casting, transverse far infrared drawing, cooling molding, rolling and cutting on the multi-component polyester slice to prepare the heat shrinkable polyester film. The heat shrinkable polyester film with high shrinkage percentage prepared by using the method is pretty high in strength and heat shrinkage performance, excellent in transparency, malleability, and toughness, good in glossiness, uniform in shrinkage, non-toxic, odorless, and easy to recycle, and a product of the film is suitable for labels for various containers and direct packaging of a food product, a beverage product, an electronic product, an electric product, a mechanical product, a hardware product and the like.

The invention relates to a partial pressure sintering method for sintering a neodymium-iron-boron magnet. Certain inert gases Ar are filled into various deflation sections in the sintering process, the pressure of the Ar gases inside a furnace is regulated according to blank deflation velocity and vacuum pump system exhaust velocity through vacuum degree control, so that heating sintering is carried out by uniformly deflating under different partial pressures of the Ar gases, and negative pressure is still kept. The partial pressure sintering method disclosed by the invention ensures the consistency and uniformity of magnetic property and saves the sintering time.

The invention discloses a full-automatic film seal-cutting packaging machine. The full-automatic film seal-cutting packaging machine is characterized by comprising a machine frame, a film conveying and sleeving device, a seal-cutting device and a conveying device; the conveying device comprises a first conveying mechanism, a second conveying mechanism and a third conveying mechanism; the seal-cutting device comprises an upper seal-cutting piece, a lower seal-cutting piece, a vertical rod and a swing piece; when the swing piece is driven to rotate in the forward direction or in the backward direction, the upper seal-cutting piece and the lower seal-cutting piece are driven to get close to or get away from each other; the swing piece is arranged movably in the vertical direction, so that the seal-cutting position when the upper seal-cutting piece and the lower seal-cutting piece are folded and the relative height of the working plane of the conveying device are adjusted; the machine frame is provided with an encoder and a programmable controller; the encoder is used for monitoring the stir quantity in real time and feeding the stir quantity back to the programmable controller; and the driving distance of a second motor is the new film packaging length of a packaged product. By the adoption of the full-automatic film seal-cutting packaging machine, the front film allowance length and the rear film allowance length of the product can be kept consistent, the height of a longitudinal seal-cutting mechanism can be easily adjusted according to to-be-packaged objects of different specifications, and the packaging quality is improved.

The invention belongs to the field of composites, and discloses a method for preparing a C/C-SiC composite part and a product prepared through the method. The method comprises the following steps that firstly, carbon fiber/phenolic resin composite powder is prepared by using a solvent evaporation method; secondly, according to a three-dimensional model of the part, the carbon fiber composite powder is molded into an initial molded blank by means of the 3D printing technology; thirdly, the initial molded blank is subjected primary densification and a C/C porous body is obtained; fourthly, the C/C porous body is subjected to a molten silicon infiltration reaction, high-temperature desilication and secondary densificaiton, and the final C/C-SiC part is obtained. By means of the method, the C/C-SiC composite part with a complex structure can be shaped in a near-net mode, the method is short in production period and low in cost, and the C/C-SiC composite part obtained through the method is low in residual silicon content and has excellent performance.

An electrowetting pixel structure includes a substrate, a hydrophobic dielectric layer, a non-polar liquid, a polar liquid, at least one electrode, and at least one contact hole. The hydrophobic dielectric layer is formed on the substrate, the non-polar liquid covers one surface of the hydrophobic dielectric layer, and the polar liquid is provided on the hydrophobic dielectric layer where the non-polar liquid and the polar liquid are immiscible. The electrode is formed on the substrate and divides the substrate into an electrode section and a non-electrode section. When a voltage is applied to the electrowetting pixel structure, the non-polar liquid contracts on the hydrophobic dielectric layer and is confined to an area substantially overlapping the non-electrode section. The contact hole is formed on the substrate at a position away from the non-electrode section of the electrowetting pixel structure.

The invention provides a preparation method of zirconium oxide aerogel, which comprises the following steps of: dissolving alkoxide into anhydrous ethanol, and stirring and mixing to obtain an ethanol solution containing the alkoxide; dropwise adding concentrated nitric acid, then adding a mixed solution containing deionized water, formamide and epoxy propane, and continuously stirring for 20-60 minutes to obtain clear transparent sols; transferring the sols into a mould, and standing and ageing to obtain ZrO wet gels; respectively soaking the ZrO wet gels at 35-100 DEG C by using ageing liquids; and finally supercritically drying an object obtained by soaking with a drying medium solvent for 2-5 times to obtain a complete block-shaped ZrO aerogel. The method provided by the invention realizes the preparation of the block-shaped ZrO aerogel and solves the technical problem of preparing a low-density medium-intensity block-shaped zirconium oxide; and in addition, the block-shaped zirconium oxide aerogel has the density of 100-250 kg/m<3>, the normal-temperature heat conductivity of 0.018-0.031 w/mk and the compressive strength of 100-300 KPa.

A high-elastic and high-fluffy ultra-cotton-imitated fabric is formed by weaving ultra-cotton-imitated filaments and spandex filaments into a gray fabric with a single-face organization structure, and produced successively through weaving, open-width washing, initial shaping, dyeing, a post-treatment, drying, sanding and a shaping technology. The high-elastic and high-fluffy ultra-cotton-imitated fabric adopts a new technological process of conducting gray fabric shaping after the open-width washing, a rationally designed initial shaping technology and an improved dyeing technology, and solves problems in the prior art that a hand feeling, fluffiness and elasticity of the fabric are obviously weakened after the ultra-cotton-imitated elastic fabric is shaped by high-temperature heating. The fabric has good stretching resilience, can be stretched freely, is free of compression or tension, has the high fluffiness and a good texture, is equipped with functions of moisture absorption and sweat release, and has very excellent wearing comfort like cotton. Meanwhile, raw materials are cheap and no additional investments are added, but performances of the product far exceed the performances of common cotton-imitated elastic cloth. The high-elastic and high-fluffy ultra-cotton-imitated fabric has very high additional product values, promises a good market prospect and can generate good economic and social benefits.

The invention discloses a three-layer composite filter paper. The first layer of the composite filter paper is polytetrafluoroethylene fiber, the second layer is polypropylene fiber, and the third layer is superfine glass fiber. The invention also discloses a method for preparing a three-layer composite filter paper, the steps of which are as follows: prepare the first layer by a single-layer filter paper preparation process, put it into a hand sheet after drying, sprinkle the second layer of slurry on the surface of the first layer of filter paper, vacuum Dehydration forming, glue spraying treatment, double-layer composite filter paper drying, sprinkle the third layer of slurry to cover the surface of the second layer of filter paper, vacuum dehydration forming, glue spraying treatment, three-layer composite filter paper into the dryer for drying. The three-layer composite filter paper prepared by the invention forms a gradient structure material, and the three different fibers have different adsorption properties to different particles, and has the advantages of high filtration efficiency, high dirt-holding capacity, long service life, good temperature resistance and wide application.

The invention relates to a dumping and sintering process for a 3D printing ceramic body. The process comprises the steps that 1, the ceramic body with the 3D printing solid content being 20-95 wt.% is placed into a crucible, and raw material powder with the same component as the ceramic body is used for embedding and filling the ceramic body; 2, the crucible which contains the ceramic body is placed into a muffle furnace, and segmented dumping is carried out in an air atmosphere; 3, the temperature is raised to sintering temperature at the temperature rise rate of 1-3 DEG C per minute, and sintering time is 1-12 hours, wherein the densification temperature is 300-1,000 DEG C lower than the sintering temperature of the ceramic body. The raw material powder with the same component as the ceramic body is used for embedding and filling the ceramic body, the raw material powder needs to wrap the ceramic body, and holes and other hollow structures in the ceramic body need to be filled with the raw material powder so that the ceramic body can be heated uniformly and slowly to prevent sudden change of temperature, prevent internal stress from being generated inside the ceramic body and reduce the probability of collapse.

The invention relates to an aluminium-doped perovskite phase negative temperature coefficient thermal sensitive ceramic material. The aluminium-doped perovskite phase negative temperature coefficient thermal sensitive ceramic material is prepared from La2O3, MnO2 and Al2O3 by steps of preparing a perovskite phase LaMn1-xAlxO3 powder material by adopting an oxide solid-phase method, then doping Al2O3, forming and sintering at a high temperature. The electrical parameter range of the aluminium-doped perovskite phase negative temperature coefficient thermal sensitive ceramic material is B25/501817-3920K+/2%, rho25 DEG C 4.7-6.13*10<6>omega.cm+/-3%. The aluminium-doped perovskite phase negative temperature coefficient thermal sensitive ceramic material has the advantages of wide adjustment range of electrical parameter and high repeatability. The aluminium-doped perovskite phase negative temperature coefficient thermal sensitive ceramic material is simple in a preparation technology and convenient to operate. The material formulation can be flexibly selected in a wide range according to the need. The aluminium-doped perovskite phase negative temperature coefficient thermal sensitive ceramic material is applied to thermistor elements for temperature measurement, control compensation and the like under different conditions.

The invention relates to the field of the injection molding of transparent ceramics and ceramic powder, which discloses a degreasing method used for a transparent alumina ceramic injection molding product. The method comprises the following steps: firstly, injecting and molding a ceramic crude blank, wherein the assistant materials of the ceramic crude blank are alumina and an adhesive, and the adhesive comprises the following components by weight percent: 18-20% of polypropylene, 70-80% of paraffin and 1-12% of stearic acid; secondly, immersing the ceramic crude blank in an extraction solvent and extracting for 3-4h at the temperature of 45-60 DEG C, wherein the extraction solvent is prepared by mixing 20-30% of alcohol by volume and 70-80% of normal heptane by volume; then, discharging the extraction solvent and drying the ceramic crude blank in the air at room temperature; and finally, burying the ceramic crude blank in alumina powder and carrying out thermal degreasing for 56-60h hot.

The invention discloses a high elastomer material equiaxial tensile testing machine. The high elastomer material equiaxial tensile testing machine comprises a rack and a tensile mechanism arranged onthe rack, wherein the tensile mechanism comprises a circular platform, a rotary table, a circular fixture, a pulling rope and a pulley mechanism, the circular platform and the rotary table are coaxially and sequentially arranged on the rack, the rotary table is driven by a driving mechanism arranged in the rack, the circular fixture is arranged on the circular platform, one end of the pulling ropeis connected with the circular fixture, and the other end of the pulling rope is connected with the rotary table by virtue of the pulley mechanism. A circular sample is placed on the circular fixture, and the circular fixture clamps the circular sample, the driving mechanism drives the rotary table to rotate, the rotary table pulls the circular fixture by virtue of the pulling rope and the pulleymechanism, and the circular fixture stretches the circular sample, so that the circular sample is uniformly expanded and contracted, and the equiaxial tensile effect is realized. The high elastomer material equiaxial tensile testing machine disclosed by the invention enables stress and deformation of the circular sample to be more uniform and is more applicable to carrying out a stress-strain relation test on a high elastomer material, and the strain measurement accuracy is higher.

The invention discloses a PVC heat shrinking film which is prepared by raw materials in parts by weight as follows: 90-100 parts of PVC resin, 1-5 parts of an assistant, 2-5 parts of a lubricating agent, 1-3 parts of a plasticizer and 2-5 parts of an antioxidant. The invention further discloses a preparation method of the PVC heat shrinkage film. The PVC heat shrinkage film obtained by adopting the preparation method has better transparency compared with a common PVC heat shrinkage film, and is uniform in shrinkage, high in shrink rate and environment-friendly; and the preparation method is simple and easy to operate, and can realize large-scale production.

The invention relates to a nanocrystal ceramic corundum abrasive material and a preparation method thereof, and belongs to the field of ceramic corundum abrasive materials. The nanocrystal ceramic corundum abrasive material is prepared from the following components of Al2(SO3)3.18H2O and additives, wherein the additives comprise a dispersant, a liquid composite sintering additive and an Al2O3 (aluminum oxide) sol crystal seed. The preparation method of the nanocrystal ceramic corundum abrasive material comprises the following steps of adding the liquid composite sintering additive and the Al2O3 sol crystal seed into an Al2(OH)3 gel precursor; performing uniform ball milling, and drying by stages, so as to obtain a dry gel; crushing the dry gel, granulating, and screening, so as to obtain gel particles meeting the particle size requirement; calcining the gel particles by sections, cooling along with a furnace, and screening, so as to obtain the ceramic corundum abrasive material with different particle sizes. The invention also discloses a preparation method of the Al2O3 sol seed crystal and the prepared ceramic corundum abrasive material. The nanocrystal nanocrystal ceramic corundum abrasive material has the advantages that by introducing the Al2O3 sol crystal seed, the defects of difficulty in introducing of solid-state nanocrystal seeds and nonuniform mixing are overcome, andthe uniform mixing of the raw materials and additives is guaranteed; the microtopography with fine and uniform crystal seed size is realized, and the compressive strength and grinding property are improved.