1387 results about "Thin sheet" patented technology

An MIM preparation method for an ultrahigh heat-conducting composite material based on diamonds and red copper. The method comprises the preparation of a mixture, internal mixing granulation, injection molding, and degreasing sintering. By means of the MIM process, not only can uniform mixing and high-density molding of diamonds and a red copper powder be achieved, thereby effectively overcoming the technical problems of non-uniform dispersity, low density, etc. during the preparation of a high-heat-conductivity composite material by means of a traditional process, but the shape and size of a product can also be accurately controlled, particularly during the production of a sheet material having a thickness of less than 1 mm; moreover, the heat conductivity (the heat conductivity thereof being up to 500-800 W / (m·K)) thereof is significantly improved and is significantly higher than that of a traditional metal material. In addition, by optimizing MIM process parameters and selecting raw materials having higher cost effectiveness, the present invention effectively reduces the production cost, such that large-scale use of the high heat-conducting composite material based on diamonds and red copper becomes possible, thereby satisfying the high-standard requirements of high-performance electronic equipment for heat dissipation materials.

The invention discloses a hydrophobic micro-nano flexible thin film structure and a characterization method, relates to the technical field of thin film structure characterization, and aims to solve the problems of poor supporting performance of a flexible thin film and inaccurate standard data acquisition. Different acceleration voltages and currents are set for the coarse thinning stage and the fine thinning stage, fine removal of materials can be achieved, the accuracy of the thinning thickness is guaranteed, the thickness, the surface fluctuation amplitude and the microstructure feature size of a thin film in a measured image are measured with the help of a scale tool, and the measurement accuracy is improved. The morphological characteristics of the hydrophobic micro-nano flexible film can be converted into accurate data, rigid support is provided for the film by utilizing high hardness, high chemical stability and good thermal conductivity of tungsten, the upper side and the lower side of a target area are milled, hole digging is conducted on surrounding materials to form a preliminary sheet contour, then U-shaped milling and back-splashing material cleaning are conducted, and the thin film is obtained. The sample form is effectively controlled, and damage of processing stress to the sample structure is reduced.

The invention discloses a silicon carbide / graphene composite material and a preparation method thereof, the composite material is of a three-dimensional network structure generated through in-situ reaction of multilayer graphene and silicon powder, silicon carbide nanowires in the structure are distributed on graphene sheets, the length of the silicon carbide nanowires is 1-5 microns, the diameter of the silicon carbide nanowires is 50-100 nm, and the silicon carbide nanowires are in a beta-SiC crystal form. The material is prepared through a carbon thermal reduction method, specifically, silicon carbide nanowires grow on the surface of graphene in situ, so that electromagnetic parameters and impedance matching characteristics of the material are optimized. The prepared composite material has the characteristics of light weight, high specific surface area, good dielectric loss and the like, and shows good broadband wave-absorbing performance in the frequency band of 2-18 GHz, the minimum reflection loss can reach-23.535 dB, and the effective absorption bandwidth reaches 1.498 GHz. The method is simple in process, low in energy consumption and suitable for large-scale production, and has wide application prospects in the fields of stealth technology, electromagnetic shielding and the like.

A keyboard membrane, which is a thin sheet molded object thermoformed by a thermoplastic wear-resistant molding membrane, comprising a plurality of concave-convex parts, the concave-convex part comprises a plurality of upwardly protruding pressing parts, each of the pressing parts has a top wall and a peripheral wall extending downward from a periphery of the top wall; the keyboard membrane is disposed on a key module with keys; each of the pressing parts is connected with one of the keys of the key module; a periphery of the keyboard membrane has a peripheral edge extending outward from the pressing part, and the peripheral edge wraps the key module to form a waterproof and dustproof keyboard.

The invention belongs to the technical field of high polymer material processing, and particularly relates to a melt extrusion molding method of an ultra-high molecular weight polyethylene wide sheet. Aiming at the technical bottlenecks of poor melt flowability, extrusion fracture and the like caused by molecular chain entanglement of UHMWPE, continuous and stable extrusion of UHMWPE wide sheets is realized by compounding a specific flow modifier and combining a stepped precise temperature control strategy and a forced symmetric cooling process. According to the method, the melt fracture phenomenon is eliminated, the intrinsic performance such as high wear resistance and low temperature resistance of UHMWPE is completely reserved, the efficiency and size limitation of a traditional mold pressing process is broken through, and a large-scale production solution of high-performance sheets is provided for the high-end fields such as food machinery and medical implants.

The utility model provides a film capacitor glue pouring shaping and pin positioning work fixture, which is characterized by comprising a base, a filler strip and a tooth-shaped positioning clamping plate, the tooth-shaped positioning clamping plate, the filler strip and the base are sequentially arranged from top to bottom, the base is provided with a plurality of cavities, the sizes of the cavities are matched with the sizes of product shells, and the tooth-shaped positioning clamping plate and the filler strip are matched with each other. The product shell is loaded with a product and then is arranged in the base cavity; the appearance size of the tooth-shaped positioning clamping plate is consistent with that of the base, the middle of the tooth-shaped positioning clamping plate is an empty slot, a plurality of convex teeth are vertically symmetrical in the empty slot and are provided with cavities matched with sheet pins to insert, and the neutral lines of the convex teeth are consistent with the neutral line of the cavity of the base; the base cavity is through up and down, so that the product is easy to demould after the glue pouring material is cured; the hollowed-out parts of the tooth-shaped positioning clamping plate are more, so that the glue filling operation is easy to complete; a cavity of a base of the product shell is matched, so that deformation of the shell in the high-temperature drying process is prevented; the tooth-shaped positioning clamping plate fixes the sheet pins, so that the pin positioning problem of the capacitor is solved, and deviation of the pins in the transfer process after glue pouring is prevented.

The invention belongs to the technical field of fault diagnosis, and particularly relates to a base rod forming device and a fault diagnosis method and system thereof. The method comprises the following steps: S1, acquiring fault diagnosis section data in an operation process of a base rod forming device; the fault diagnosis data comprises real-time operation parameters and physical state parameters of the base rod forming device; the real-time operation parameters comprise the real-time operation speed of a pressing roller used for shredding sheets, the real-time operation speed of a cloth belt used for conveying forming paper and the real-time operation speed when a cutter cuts a base rod; the physical state parameters comprise one or a combination of two or three of temperature, pressure and vibration; and S2, inputting the fault diagnosis data into a pre-trained fault diagnosis model in the form of time sequence data to obtain the fault type of the base rod forming device. The technical problem that in the prior art, misjudgment and missed judgment are prone to occurring in fault diagnosis of the base rod forming device is solved.

Provided is a three-dimensional pattern card and a method of manufacturing the same. The method includes: (a) preparing a master mold in which a pattern of a three-dimensional shape is engraved on one surface; (b) fabricating a three-dimensional pattern module by forming a three-dimensional pattern on a surface of a transparent sheet made of a synthetic resin material using the master mold; (c) fabricating a rear card body module by sequentially laminating and bonding a first core sheet, an antenna inlay sheet, a second core sheet, and a rear protective sheet; (d) applying a UV adhesive to a surface of the first core sheet of the rear card body module; and (e) laminating the three-dimensional pattern module on the UV adhesive applied surface of the rear card body module and irradiating UV to cure the adhesive so as to bond the rear card body module and the three-dimensional pattern module.

To highly accurately calculate a lamination deviation amount between two layers of a laminated sheet body.SOLUTION: The sheet body 2 has a first sheet body 3 and a second sheet body 4 which are alternately laminated. The first sheet body includes a first mark 3334 and first through-holes 30c, 30d. The second sheet body includes a second mark 4344 and second through-holes 440c, 40d. The first marker is formed such that the first direction D1 can be specified. The second mark is formed so that the second direction D2 can be specified. When the first sheet element is accurately stacked on the second sheet element, the second mark is located at a predetermined second ideal position with respect to the first mark. When the second sheet element is accurately stacked on the first sheet element, the first mark is located at a predetermined first ideal position with respect to the second mark. In the upward view, the positional relationship between the position of the first marker and the second ideal position with respect to the first direction coincides with the positional relationship between the position of the second marker and the first ideal position with respect to the second direction.SELECTED DRAWING: Figure 6

The present invention concerns a paper-based barrier multilayer packaging material structure (1) being formed as a unitary sheet and comprising from its outer surface to its inner surface, the following layers: —a polymer dispersion coating (9) having a thickness of 1 to 10 μm, —a paperboard (8) having a grammage of between 120 g / m2 and 500 g / m2, —a water-based or solvent-less adhesive (7) having a thickness of 1 to 10 μm, —a barrier metallized paper layer (MBPL) having substance weight between 30-120 g / m2, preferably 45 to 90 g / m2 and a Water Vapour Transmission Rate (WVTR) of 10 to 0.1 g / m2 / d, preferably a WVTR of 1.0 to 0.1 g / m2 / d measured at 38° C. and 90% RH, and an Oxygen Transmission Rate (OTR) comprised between 100 and 0.1 cc / m2 / d, measured at 23° C. and 50% RH, preferably an OTR comprised between 1.0 and 0.1 cc / m2 / d. —at least one layer of a polymer dispersion coating (2) having a thickness of 1 to 25 μm, preferably of 5 to 15 μm.

The application provides a micron-thick graphite film and a growth method thereof. A substance with high carbon content is dispersed in an organic solvent and coated on a metal foil, and after drying, a carbon film / metal foil is obtained; or the substance with high carbon content is made into a sheet and placed on a metal foil, and a carbon film / metal foil is obtained; in a protective atmosphere, a current is applied to the sample, the carbon film / metal foil is heated by using the Joule effect of the current, and the power supply is stopped, so that a micron-thick graphite film is obtained on the surface of the metal foil. The graphite film is prepared by using the dissolution-precipitation of carbon in the metal substrate in the process of high-temperature-low-temperature temperature change. Since the metal substrate has an epitaxial relationship with the graphite lattice, the graphite film with AB stacking can be directly precipitated, so that the graphitization of carbon can be realized at a lower temperature. The reaction system is radiated and heated by using the Joule heating characteristic of the current, the heating efficiency is effectively improved, the temperature is raised from room temperature to the growth temperature in a few seconds, the influence of the side reaction is reduced, and the raw material utilization rate is improved.

A pressure sensing conductive elastomeric composite material, the material comprising a polymer matrix, itself comprising an elastomeric material, and a conduction network within the polymer matrix. The conduction network comprises: a plurality of particle chains, with each particle chain comprising a plurality of metallic ferromagnetic particles, a plurality of liquid metal droplets, and a plurality of non-ferromagnetic conductive platelets, wherein the conductivity of the composite material varies as a function of the pressure applied to the material.

The invention relates to the technical field of material sealing, in particular to a high-performance insulating ceramic sealing method for a neutron tube, which comprises the following steps: sequentially carrying out organic solvent ultrasonic cleaning and argon plasma etching activation treatment on a sealing surface of a cylindrical high-purity aluminum oxide ceramic piece, and depositing a titanium transition layer through magnetron sputtering, the ceramic piece with the titanium transition layer is obtained; the sealing face of the kovar alloy cylindrical flange plate is subjected to acid pickling, an oxide layer is removed, cleaning and drying are conducted, and a metal sealing part is obtained; preparing an active brazing filler metal sheet; the components are assembled in sequence to form a pre-assembled component; the pre-assembled component is placed in a vacuum brazing furnace, axial pre-tightening force is applied to the pre-assembled component, sealing is completed, then cooling is controlled, and a sealing piece with an airtight brazing joint is formed; and carrying out annealing treatment to obtain a finished product sealing assembly. Therefore, the problems of low dielectric strength, large thermal expansion coefficient difference, difficulty in interface quality control and the like in the prior art are solved.

A method for producing an extruded plastic sheeting material (12; 12′; 12″) having a multitude of parallel hollow chambers (14) in its interior, includes the steps of extrusion of a sheet of the sheeting material (12; 12′; 12″) that is continuous in the running direction (x) of the hollow chambers (14) while applying compressed air to the hollow chambers (14) from the inside, the production of weakening lines (16) in the sheet running transversely to the running direction (x) of the hollow chambers (14) by introducing creases (50) into the sheeting material (12), the depth of which is dimensioned in such a way that the hollow chambers (14) are not interrupted by the creases (50).

The invention discloses a low-loss high-frequency transformer based on nanocrystalline alloy, and belongs to the technical field of transformers, the low-loss high-frequency transformer comprises a mounting plate, an n-shaped framework, a columnar magnetic core, a winding and a protective heat dissipation mechanism, the columnar magnetic core is of a three-column type composite structure and is formed by staggering and laminating nanocrystalline thin film layers and ferrite sheet layers, a stepped air gap structure and an insulating isolation layer are arranged on the outer surface; and the winding leading-out end is connected with an external circuit through symmetrically distributed plug connectors. The protective heat dissipation mechanism is composed of an epoxy layer containing boron nitride filler, a heat conduction ring, heat dissipation fins, a heat dissipation fan and a flow guide plate. The advantages of nanocrystalline and ferrite materials are combined, a composite heat dissipation system is matched, the magnetic core loss under the high-frequency working condition is remarkably reduced, temperature rise is effectively controlled, the insulation performance and assembly stability are improved, low-loss, high-efficiency and high-stability operation is achieved, and the requirements of the fields of new energy automobiles, photovoltaic energy storage and the like are met.

The invention belongs to the technical field of brazing, and particularly relates to a contact-shaped composite brazing filler metal and a preparation method and application thereof.The preparation method comprises the steps that a sheet made of a material A is obtained; stamping the sheet by using a stamping die so that the surface of the sheet is bent to form a plurality of trapezoidal grooves to obtain a honeycomb array structure sheet; solder paste is sprayed and printed in the trapezoidal grooves of the honeycomb array structure sheets, and the solder paste comprises brazing filler metal B and scaling powder; the honeycomb-shaped array structure sheet sprayed with the soldering paste is put into a reflow oven to be heated, the brazing filler metal B in each trapezoid-shaped groove is melted to form a protruding contact, and a contact-shaped composite brazing filler metal sheet is obtained; wherein the scaling powder is separated out in the heating process and flows to cover the outer surface of the contact-shaped composite brazing filler metal sheet; the high-strength composite welding spot can be prepared, and the characteristics of low-temperature welding and high-temperature application are achieved.

Systems and methods for press-forming a flexible thin sheet of ceramic paste, such as, e.g., barium titanate, into a wavy shape. The wave may be 1-dimensional, such as, e.g., a sinusoid, or 2-dimensional, such as, e.g., an egg-crate shape. A mold embossed with a reverse, or negative, of an intended form of the wavy shape may be used. The egg-crate shape ceramic layers may be stacked with alternating sheets of a conductive, or electrode, material before being sintered and densified. Alternatively, the ceramic sheets can be layered with the sheets of conductive material, and then pressed into the wavy shape together. Optionally, conductive ink may be applied to the ceramic sheets instead of using sheets of conductive material in both cases.

The invention relates to a flash spinning sheet material with better single stripping degree and application of the flash spinning sheet material, the flash spinning sheet material comprises polyethylene as a raw material, and the thickness of the flash spinning sheet material is 0.11-0.29 mm; the single stripping degree of the flash spinning sheet material is 10-26 (Ns / mm); the single peeling degree = (logarithmic peeling strength * Gurley ventilation resistance) / thickness, and the peeling strength in the CD direction of the flash-spun sheet material is greater than the peeling strength in the MD direction. The sheet material provided by the invention has relatively good single stripping degree, so that the sheet material has a wide application scene.

The present disclosure describes a method of making a composite product (20) by additive manufacturing. The method includes providing an additive manufacturing apparatus having a build platform, the build platform having a planar face on which the product is formed; securing a fabric (22) sheet to the planar face (11) to provide a planar fabric surface thereon; additively manufacturing an intermediate object on the planar fabric surface in the apparatus (12) by light polymerizing a dual cure resin to produce an intermediate object on the build platform, the intermediate object including the fabric (22) sheet having the three-dimensional object (21) adhered thereto; and concurrently with or following the additively manufacturing step, further curing the intermediate object to produce a composite object including the fabric sheet having the three-dimensional object adhered thereto. Composite object and products are also described herein.

The invention discloses a preparation method for rare earth permanent magnet single-piece forming, and belongs to the technical field of rare earth permanent magnet preparation. Comprising the following steps that 1, raw material powder is prepared, specifically, rare earth alloy is smelted and then condensed into sheets, then fine powder is obtained through a hydrogen explosion crushing technology, an antioxidant and a grain refiner are added, and the raw material powder is obtained through uniform mixing; 2, single-sheet mold orientation pressing, wherein the single-sheet mold with a nanometer coating is used for conducting two-step pressing on the raw material powder under the pulsed magnetic field; step 3, sintering and post-processing: sintering the material obtained by pressing in the step 2 in stages, and then applying an auxiliary magnetic field for cooling; the invention specifically focuses on an innovative method for preparing a high-performance rare earth permanent magnet by means of a single-piece forming process. The method has remarkable advantages and wide applicability in the aspect of efficient and low-cost production of permanent magnets such as neodymium iron boron and samarium cobalt.

The invention belongs to the technical field of metal stamping, and particularly relates to a forming device of a sheet stamping part for an aviation structure and a using method thereof.The forming device comprises a base, an L-shaped supporting plate is fixedly installed at the upper end of the base, a stamping hydraulic cylinder is fixedly installed on the horizontal portion of the L-shaped supporting plate, and the output end of the stamping hydraulic cylinder is fixedly connected with an upper die; and a pressure sensor is arranged between the punching hydraulic cylinder and the upper die. The stamping pressure, speed and pressure maintaining duration are automatically regulated and controlled based on the thickness of the thin sheets, the thin sheets with the standard thickness are preheated before stamping, die abrasion is automatically calculated, maintenance is reminded in time, the stamping forming quality and precision of the aviation thin sheets with different thicknesses can be comprehensively guaranteed, the problem that the thick and thin sheets are insufficient in formability is effectively solved, and the production efficiency is improved. The die is prevented from being excessively abraded to affect quality, so that the aviation sheet stamping requirement is better met, and the stamping work reliability is improved.

The present invention addresses the problem of providing a multi-layer sheet comprising: an adhesive agent layer that contains an acid modified polyolefin; and a base material layer that contains a polyphenylene ether. The peeling strength of the adhesive agent layer and the base material layer is high. This multi-layer sheet is characterized by comprising: a base material layer (A) which contains 40-99.9 mass% polyphenylene ether (a1), 0-59.9 mass% polystyrene (a2), and an amino-group-containing polymer (a3); and an adhesive agent layer (B) which contains an acid modified polyolefin.

The utility model discloses a detector test strip fixing module convenient for non-professionals to use, which relates to the technical field of fast detection detectors and comprises a base and an insertion piece. When the kit is used, the bottom end of a reagent strip is fixed in the fixing groove and is matched with the fixing block to fix the reagent strip, and during detection, the sampling rod punctures the thin sheet A between the solution cavity and the communication cavity from top to bottom, so that a diluent with a sample enters the communication cavity and reaches the other side of the insertion sheet through the through hole; due to the fact that the bottom of the reagent strip is fixed in the fixing groove and makes contact with the diluent passing through the through hole, detection is achieved, the diluent is blocked below the first water blocking baffle and does not make direct contact with other parts of the reagent strip, and the purpose that the diluent gradually seeps to the top of the reagent strip is achieved; and therefore, the operation convenience and the accuracy of a detection result during detection by a non-professional user are further improved.

The article of the present application is used to store thin plate-like parts such as semiconductor wafers (substrates) for transport, storage, etc. Multiple articles of the present application can also be stacked for use.

The utility model discloses a temporary storage mechanism which is suitable for temporarily storing photovoltaic sheets. The temporary storage mechanism comprises a temporary storage assembly and a lifting assembly for driving the temporary storage assembly to ascend and descend. The temporary storage assembly comprises a mounting plate, a profile rod body, a connecting piece and a temporary storage rod; the mounting plate is mounted on the lifting assembly, scale marks and a plurality of sliding grooves are formed in the mounting plate, and the scale marks are arranged on the edges of the sliding grooves; a weight-reducing through hole is formed in the profile rod body; one end of the connecting piece is connected with the sliding groove, and the other end of the connecting piece is connected with the weight reduction through hole located in the first end face of the profile rod body. The profile rod body is suitable for moving in the sliding groove. A plurality of groups of opposite surfaces of the section bar body are provided with weight-reducing grooves, and a plurality of connecting holes are formed in the weight-reducing grooves; the temporary storage rods are installed in the connecting holes, and the installed temporary storage rods are suitable for supporting the photovoltaic sheets. According to the temporary storage mechanism, the profile rod body provided with the weight reduction groove, the weight reduction through hole and the connecting hole is adopted, and on the premise that the structural stability of the temporary storage mechanism is guaranteed, light weight of the profile rod body is achieved.

The utility model relates to the technical field of bionic pressure sensors, in particular to a broadband wide piezoresistive sensing structure simulating scorpion threshold response characteristics, which comprises a threshold adjusting structure and a piezoresistive sensing unit. The threshold value adjusting structure comprises a flexible deformation cover and a threshold value sensing structure base, the flexible deformation cover covers the top end of the threshold value sensing structure base, the piezoresistive sensing unit is arranged in the threshold value sensing structure base, and a rectangular through groove is formed in the bottom of the threshold value sensing structure base; a threading hole is formed in the side wall of the threshold sensing structure base; the flexible deformation cover comprises a sheet, and the center of the lower surface of the sheet is integrally connected with an inverted-cone-shaped protruding block. The problems that the inherent contradiction exists between the sensitivity and the bandwidth performance of an existing piezoresistive sensor, in particular, structural instability under large signals is easily caused when the sensitivity is improved through a traditional design, and the response capacity to small signals is greatly reduced by increasing rigid support to expand the measuring range are solved.

A machine comprises a pick and place stage and includes a plurality of releasable connectors.A support material is wound over rollers onto a storage roller or spool. The backing support material provides a substantially flat surface upon which a sheet of flexible material is placed by the pick and place stage.The sheet of material and the backing support material are then wound onto the storage roller or spool which may be removed for storage and / or transportation.Delicate sheets of pieces of flat material, such as carbon fibre, may thus be protected from damage during handling, storage and transportation that may otherwise result in damage to the material.The process is reversed to lay down the material, for example into a mould, during manufacture of, for example, an aeroplane wing.

The invention relates to the technical field of computer vision and automatic control, and discloses an automatic checking method for the number of stacked sheet materials, which comprises the following steps: identifying a standard number table image to obtain a platform standard identifier and a material standard number; performing visual identification processing on the field material image, identifying a platform identification target and all material targets corresponding to the platform identification target, and obtaining position information of the material targets; identifying the platform identification target to obtain a platform analysis identifier; and outlier elimination processing and gap filling processing are carried out on the material target according to the position information. And finally obtaining a platform analysis identifier and a material analysis quantity. And matching the platform analysis identifier with the platform standard identifier, comparing the material analysis quantity corresponding to the matched platform with the material standard quantity, and outputting a verification conclusion according to a comparison result. Through the arrangement, accurate detection of the material quantity is realized, and the accuracy, the efficiency and the automation level of warehouse checking work are improved.

The application discloses a kind of X waveband wave-absorbing honeycomb composite layer structures based on graphene derivative, composite material and preparation method and application thereof, method steps include: honeycomb material processing: cutting and washing to honeycomb material;Configuration wave-absorbing slurry: configuration graphene derivative wave-absorbing slurry, and stirring and sanding are carried out;Two times of impregnation: aramid paper honeycomb sheet is impregnated into graphene derivative wave-absorbing slurry, then drying is carried out, and two times of impregnation are carried out;Surface bonding treatment: glass fibre and / or epoxy resin skin are bonded on the upper surface of honeycomb sheet, and conductive carbon fibre and / or epoxy resin skin are bonded on the lower surface of honeycomb sheet.The application can realize the strong absorption (RL<-15dB) characteristics of X waveband electromagnetic wave under thin thickness (8mm), and the material has good structural strength and environmental adaptability, and the preparation method is simple, the cost is moderate, and is suitable for large-scale industrial production.

This invention provides a method for encapsulating a ceramic housing and the ceramic housing itself. The method includes: providing a ceramic encapsulation base, the ceramic encapsulation base having a cavity for device encapsulation, and multiple preset areas at the bottom of the cavity; fabricating a low-resistance sheet with a shape matching the preset areas, wherein the thickness of the plating on the low-resistance sheet matches the plating thickness requirement of the preset areas; fixing the corresponding low-resistance sheet in the preset areas of the ceramic encapsulation base, and mounting and bonding the electronic components to be encapsulated; and sealing the ceramic encapsulation base with a cover plate. The ceramic housing encapsulation method provided by this invention has a simple manufacturing process and is easy to process.