57 results about "Composite strength" patented technology

The invention provides an intelligent temperature control method for a corrugating machine, and belongs to the technical field of corrugated paper products.The intelligent temperature control method comprises the steps that a steam temperature sensor set and a linear speed detection device are installed on a corrugating machine production line, and a speed-steam temperature dynamic compensation mathematical model based on nonlinear regression analysis is established; a feedforward control system architecture is constructed to realize real-time calculation and transmission of a steam temperature compensation value, a double-layer game optimization model is established to coordinate steam energy consumption minimization and composite quality optimization targets, and a self-adaptive adjustment algorithm is started according to composite strength and appearance quality feedback signals to dynamically adjust model parameters. Steam temperature coordination control is implemented to optimize temperature distribution, a steam temperature control effect evaluation system is established for real-time evaluation, and the technical problem that in the prior art, steam temperature dynamic compensation control cannot be achieved according to the speed change of a production line in the production process of the corrugating machine is solved.

The invention discloses a multi-material composite injection molding method and system, and the method comprises the steps: carrying out laser surface etching on a continuous fiber reinforced substrate to form a microgroove array, and spraying an activator to generate an activated fiber preform; performing infrared partition heating on the marginal area, constructing a temperature gradient field, positioning the marginal area to a mold cavity, injecting engineering plastic melt into a mold, synchronously collecting mold vibration frequency spectrum and infrared thermal imaging data, establishing a mapping relation between vibration dominant frequency characteristics and temperature gradient values, and dynamically regulating and controlling injection molding pressure and pressure maintaining switching time. A foaming elastomer material is injected into a reserved groove position of the matrix-fiber composite blank, a self-foaming reaction is triggered through blank waste heat, and a composite structural part is generated; based on vibration frequency spectrum and infrared thermal imaging data continuously collected in the injection molding process, the process health index is calculated, the product qualification is judged, control over a multi-material interface is achieved by fusing infrared thermal imaging, and efficient and low-consumption production is achieved while the composite strength and the sealing performance are improved.

The utility model discloses composite bag production equipment, and relates to the technical field of composite bag production, the composite bag production equipment comprises a rack, a lower hot press roll and an upper hot press roll, the lower hot press roll and the upper hot press roll are used for carrying out a composite process on a first base material and a second base material, fixed columns are fixedly mounted on the rack, a pair of fixed columns is provided with sliding chutes, and sliding rods are arranged in the sliding chutes in a penetrating manner; a lifting assembly is further arranged on the sliding rod and used for adjusting the position of the pressing roller, a pair of supporting columns is fixedly installed on one side of the rack, fixing bases are fixedly installed on the supporting columns, a rectangular frame is rotationally connected between the fixing bases through bearings, and tensioning assemblies are further arranged between the supporting columns and the rectangular frame. The tensioning assembly comprises a pair of tensioning rollers rotationally installed on the rectangular frame and a semicircular gear fixedly installed on one side of the rectangular frame. Compared with the prior art, by arranging the lifting assembly, control over the base material compounding strength by the pressing roller is achieved, and the base material compounding quality is improved.

The invention relates to a metal piece and engineering plastic composite product and a preparation process thereof, in particular to a high-composite-strength metal and engineering plastic injection molding composite product and a preparation process thereof. Through a metal surface treatment process, micron-sized holes are formed in the surface of metal through laser etching, and further surface treatment is carried out on the surfaces of the micron-sized holes, so that strong combination of the metal and engineering plastic is realized. According to the composite product and the preparation process thereof, the technical difficulties that the injection molding bonding strength of a metal part and engineering plastic is not high, a metal part rubber coating mold is difficult to design, and the process environment is not friendly are effectively solved.

The invention is suitable for the field of composite non-woven fabric processing, and provides a composite non-woven fabric hot-rolling film laminating device which comprises a workbench, the workbench is fixedly connected with a hot-pressing box, one side of the hot-pressing box is provided with a supporting frame A, the supporting frame A is connected with two discharging machines used for discharging non-woven fabric and films, and the two discharging machines are connected with the workbench. A corona mechanism is arranged between the feeding machine and the hot pressing box and used for conducting corona treatment on the non-woven fabric and the thin film, and the other side of the hot pressing box is connected with a winding machine used for winding through a supporting frame C. The problem that the interface bonding force is weakened due to uneven temperature distribution in the non-woven fabric film covering process is solved, and the wrinkle defect caused by heat shrinkage of the material is effectively inhibited. Through the synergistic effect of bidirectional gradient heating and stretching, the bonding uniformity of the film and the non-woven fabric is improved, and meanwhile, the composite strength of the edge area of the wide material is enhanced.

The invention relates to the technical field of non-woven materials, in particular to a composite non-woven fabric processing method and system and a composite non-woven fabric. Firstly, the first fiber net layer is subjected to electrostatic treatment, so that the surface of the first fiber net layer is provided with electrostatic charges, then hot melting polymer powder is sprayed on the surface of the second fiber net layer, then the two fiber nets are overlapped, the powder is evenly transferred to the first fiber net layer through the electrostatic adsorption effect to form a pre-composite green body, and then the pre-composite green body is subjected to ultrasonic needling through an ultrasonic needling device. According to the method, accurate distribution and transfer of the powder are achieved through electrostatic adsorption, efficient combination of fibers is achieved at the normal temperature through the synergistic effect of electrostatic adsorption and ultrasonic needling, the structural strength of the non-woven fabric is effectively improved, and the non-woven fabric has the advantages of being simple in preparation process, low in cost and easy to popularize and use. The composite strength of the composite non-woven fabric is improved while the fluffy structure and the inherent characteristics of the raw materials are kept.

The invention discloses an automobile crash dummy skin material composite strength detection device and method, and relates to the technical field of material mechanics analysis, and the automobile crash dummy skin material composite strength detection device comprises a main body support unit, an impact unit, a stretching unit, an alignment unit and a control unit. The main body support comprises a cross beam, the impact unit is provided with an impact force regulation and control assembly with a punch, a clamping structure on the stretching unit is arranged on the cross beam, a two-dimensional translation sliding table bearing belt turntable is arranged below the cross beam, and the alignment system comprises a cross laser projector and a machine vision unit which are arranged on the cross beam. The height of the impact and stretching unit is adjusted by adjusting the height of the cross beam, the impact force is accurately adjusted by the impact unit, and the dynamic force sensor collects mechanical data in real time; and the stretching unit feeds back adaptive clamping force by means of a multi-force sensor, so that the result is prevented from being influenced. The alignment system realizes translation and rotation of a sample through a two-dimensional translation sliding table and a turntable, and laser positioning and machine vision precise position control are combined, so that the dispersion is reduced. The device can accurately detect the impact and tensile composite strength of the polyurethane material, reduce manual intervention and shorten the test time.

The application relates to the technical field of filter materials, and discloses a kind of ultra-low resistance high-efficiency air filter screen material and preparation method thereof, the material includes filter layer, first grid layer that is attached with filter layer and second grid layer that is bonded with filter layer, the surface of second grid layer is provided with adhesive, adhesive includes 30~45 parts low melting point EVA, 5~8 parts high crystalline EVA and 10~20 parts curing agent, curing agent is arranged on the surface of crystalline EVA, and the raw material of curing agent is thiol and epoxy compound with mass ratio 0.16~2.68:1;The curing time of the second grid layer of the material can be extended to 5~10 min when being combined with filter layer, the adhesive can be fully infiltrated on the surface of filter layer when being combined, the composite strength of grid cloth and filter layer can be guaranteed, the influence of adhesive on filter material can be significantly reduced, and the air resistance of filter material can be reduced to 0.5~0.7 Pa.

The invention discloses a special back-drilled composite aluminum foil for a PCB (Printed Circuit Board), which relates to the technical field of composite aluminum foils and comprises an aluminum foil layer, a hot-melt composite layer and a waterproof insulating layer which are sequentially laminated and attached, the hot-melt composite layer is prepared from the following components in percentage by weight: 40%-60% of hot-melt polymer particles, 15%-25% of a stabilizer, 10%-20% of nano reinforced particles and 5%-15% of an inorganic filler; the waterproof insulating layer is prepared from the following components in percentage by weight: 40%-50% of reinforced fiber fabric, 30%-40% of thermosetting resin, 8%-12% of a hydrophobic coupling agent and 8%-12% of nano filler. According to the back-drilled composite aluminum foil special for the PCB, the composite strength is improved, the defect of interlayer stripping is effectively overcome, and the occurrence rate of cloak and entangling is reduced; the waterproof performance is excellent, the moisture absorption problem of a traditional base material is solved, and the back drilling precision and the signal integrity are ensured.

The utility model discloses a heat-insulating anti-aging hose, which belongs to the technical field of hoses and comprises a lining layer, a reinforcing layer, a heat-insulating layer and a protective layer which are sequentially wrapped and fixed from inside to outside. The heat insulation layer is formed by winding and coating an aerogel felt tape outside the reinforcing layer, the aerogel felt tape comprises an aerogel body and a connecting body, and the aerogel body is fixedly connected with the connecting body. The heat insulation layer of the hose is high in composite strength and not prone to delaminating, the heat insulation effect can be effectively achieved for a long time, and the service life of the heated radiation pipe body can be prolonged.

The utility model relates to the technical field of fabric compositing, in particular to a composite structure for enhancing fabric compositing strength, which comprises a first unwinding component and a second unwinding component. A first fabric unwound by the first unwinding assembly and a second fabric unwound by the second unwinding assembly sequentially enter the compounding assembly and the drying oven and then are wound by the winding assembly, and the spraying assembly is arranged on the upper side of the first fabric between the first unwinding assembly and the compounding assembly. A first box body is arranged on the lower side of the first fabric between the spraying assembly and the compounding assembly, a first negative pressure opening is formed in the upper end face of the first box body, a second box body is arranged on the upper side of the second fabric between the compounding assembly and the drying oven, a second negative pressure opening is formed in the lower end face of the second box body, and extraction openings are formed in the first box body and the second box body; according to the air suction device, the permeation of an adhesive to the fabric can be effectively enhanced, and the composite strength of the fabric is enhanced.

The invention provides a composite material strength parameter inversion method considering an in-situ effect in an ultralow-temperature environment, and the method comprises the steps: obtaining the elastic section test data of a composite material one-way plate and a composite material laminated plate in the ultralow-temperature environment, and employing a composite material finite element model and a particle swarm optimization (PSO) algorithm, taking consistency of a response value of finite element simulation of the composite material and strain response of an elastic section measured by a test as a target, performing inversion to obtain constitutive parameters of the composite material, and establishing a progressive failure model of the composite material in combination with a failure criterion of the composite material and a rigidity degradation model; and finally, according to test data of the damaged sections of the composite unidirectional plate and the composite laminated plate, a composite progressive failure model and a PSO optimization algorithm are adopted, and composite strength parameters are obtained through inversion. The method solves the problem that the strength parameters of the composite material considering the in-situ effect are difficult to accurately obtain in the ultralow-temperature environment, is convenient to operate and accurate in parameter obtaining, can be repeatedly applied, and is used for simulation modeling, strength evaluation and the like of the composite material.

The present invention relates to the technical field of desiccant packaging materials, and in particular to a tear-resistant and moisture-proof desiccant packaging material and a production method thereof. The tear-resistant and moisture-proof desiccant packaging material comprises: a polyester non-woven fabric, and a polypropylene film and a polyethylene film respectively attached to both sides of the polyester non-woven fabric; the raw materials of the polyester non-woven fabric comprise: polyester fibers and prefabricated fibers. The polyester non-woven fabric is prepared by the following specific operations: prefabricated fibers are dispersed on the mesh curtain of the mesh machine to form a bottom layer, and then the polyester fibers are evenly dispersed on the surface of the bottom layer to form an intermediate layer, and then the prefabricated fibers are dispersed on the surface of the intermediate layer to form a surface layer, and then hydroentangled. Theoretically, without glue, hot pressing alone cannot achieve good composite strength. The present invention enhances the strength of the packaging material in a specific way. At the same time, the product is environmentally friendly and efficient, and improves the problems of water seepage and powder leakage of the desiccant packaging material. Compared with products on the market, the present invention has stronger tear resistance and improves the quality of the packaging material.

The application provides a paper-plastic sealing film and a preparation method and application thereof, and relates to the technical field of sealing films.The preparation method of the paper-plastic sealing film comprises the following steps: S1, a single-component polyurethane adhesive is coated on one side of a paper base layer to form a first adhesive layer, a printing layer is first combined with the first adhesive layer, winding is performed, and first aging is performed; S2, a single-component polyurethane adhesive is coated on the other side of the paper base layer to form a second adhesive layer, a polyester film layer is secondly combined with the second adhesive layer, winding is performed, and second aging is performed; and S3, a two-component polyurethane adhesive is coated on the side of the polyester film layer which is not combined to form a third adhesive layer, a polyolefin film is thirdly combined with the third adhesive layer, winding is performed, and third aging is performed.The paper-plastic sealing film prepared by the method has the advantages of improved flatness, excellent composite strength, no delamination, and no bubbles after heat sealing.

The application belongs to the technical field of toilet paper preparation, and particularly relates to water-absorbing and soluble toilet paper and a preparation method thereof, which comprises the following steps: S1, dosing and spreading pulp: long-fiber pulp board and short-fiber pulp board are taken according to a weight ratio to prepare long-fiber pulp and short-fiber pulp; S2, pulp refining: the long-fiber pulp is delivered to a refiner for refining, and the short-fiber pulp is delivered to a fiber defibrator for defibration; S3, pulp mixing: the long-fiber pulp and the short-fiber pulp after the treatment in step S2 are mixed to obtain mixed pulp, then modified inorganic fillers and composite strength improvers are added, water is added to dilute the pulp to a concentration of 0.1-0.3%, the pH of the pulp is adjusted to be less than or equal to 7, and a papermaking base material is obtained; S4, web forming; S5, pressing and drying; S6, doctor blade creping; and S7, winding into paper. The water-absorbing and soluble toilet paper provided by the application has reliable strength in a dry state, can maintain a complete structure in a wet state, and can be quickly dispersed after meeting water.

The invention discloses an aluminum-wood edge-wrapped composite board which comprises a composite board body, the composite board body comprises an upper wrapping aluminum sheet, a lower wrapping aluminum sheet and wrapped double-layer hollow boards, and a filling layer is arranged between the double-layer hollow boards; the double-layer hollow plate comprises an upper wood plate and a lower wood plate, and a supporting cylinder of an I-shaped structure is fixedly installed between the upper wood plate and the lower wood plate through rivets. According to the aluminum-wood edge-covered composite board, the supporting cylinders are supported between the upper wood board and the lower wood board, use of wood is reduced, compositing is firm, the compositing strength is high, and the supporting force is enhanced; the gap between the upper wood board and the lower wood board can be filled with any material and is not affected by toughness, flexibility and adhesion resistance of the material, the thickness can be reasonably selected according to the height of the supporting cylinder, a thicker heat preservation layer can be provided, and softer, lighter and heat preservation foam can be selected as the material. And the strength, the supporting force and the like are not influenced.

The utility model relates to the field of plastic packaging barrels, and discloses a multilayer composite strength polymer plastic packaging barrel which comprises a barrel body, the barrel body comprises an inner barrel, a supporting layer is fixedly arranged on the outer side of the inner barrel, a buffering structure is arranged in the supporting layer, the buffering structure comprises two air cavities which are symmetrical up and down, and the air cavities are communicated with the supporting layer. Springs are fixedly arranged on the inner walls of the upper sides and the lower sides of the two air cavities, pistons are fixedly arranged at the other ends of the springs, the pistons are slidably arranged in the air cavities in a sleeved mode, an anti-collision structure is fixedly arranged on the outer side of the supporting layer, and the anti-collision structure comprises a plurality of anti-collision pipes. The multiple anti-collision pipes are equally divided into an upper group and a lower group, connecting pipes fixedly sleeve the positions, close to the buffering structures, of the anti-collision pipes, and air guide pipes fixedly sleeve the sides, close to the supporting layers, of the connecting pipes. According to the anti-collision bucket, the anti-collision capacity of the bucket body can be enhanced through the cooperation of the anti-collision structure and the buffering structure, the flowing-out speed of liquid is reduced through the flow slowing cover, and splashing is prevented when the liquid is poured out.

The invention relates to the technical field of geomembranes, in particular to a multi-layer composite geomembrane and a preparation method thereof, which are used for solving the problems of insufficient anti-seepage performance, mechanical strength, puncture resistance and aging resistance of the existing composite membrane. The geomembrane is of a five-layer composite structure, a fortress layer, an adhesive layer, an anti-seepage layer and an oyster sand surface layer are laminated, hot-pressed and compositely molded through a unique layered structure design and a material formula, so that the geomembrane has excellent mechanical strength and composite strength; the fortress layer provides top layer protection; the carbon black, the light stabilizer and the antioxidant synergistically improve the anti-aging performance; the anti-seepage layer has good anti-seepage performance and serves as a main anti-seepage core, the processing fluidity of the anti-seepage layer is improved through low-density polyethylene, and internal defects are reduced; the nano SiO2 in the sand surface layer provides higher surface hardness and puncture resistance; the adhesive layer firmly combines all the layers through chemical bonding, interface defects among all the layers are eliminated, and good impermeability and adhesive performance are provided.

The invention belongs to the technical field of self-heating products, and particularly relates to a self-heating membrane core which is stable in heating and long in duration and a preparation process of the self-heating membrane core. Comprising the following steps: filling modified polytetrafluoroethylene with magnetic particles; preparing a shell-core fiber water guide agent; preparing a self-heating sheet core; preparing a heat-stabilizing electrolyte, guiding current, and pressing the self-heating sheet. According to the method, magnetic particle filling modified polytetrafluoroethylene is prepared and serves as a binder of the spontaneous heating sheet, and high shearing force is applied to the magnetic particle filling modified polytetrafluoroethylene for fibration by controlling the rotating stirring speed and the magnetic field size of a high-speed airflow shearing machine; according to the preparation method, polytetrafluoroethylene can fully construct a strong and continuous three-dimensional fiber network, all active substances, conductive agent particles and the like are firmly wrapped in the three-dimensional fiber network, and the prepared self-heating sheet core is high in composite strength and has good heating stability and heating durability.

The application provides a clamping type edge covering profile, which comprises an outer edge covering and an inner edge covering, and the outer edge covering and the inner edge covering are fixedly connected through a first connecting edge and a second connecting edge; the outer edge covering comprises two vertically fixed outer edge covering walls, and the lengths of the two outer edge covering walls are the same; the inner edge covering comprises two vertically fixed inner edge covering walls, and the lengths of the two inner edge covering walls are the same; the inner edge covering is arranged on the inner side of the outer edge covering, and the two outer edge covering walls and the two inner edge covering walls are arranged in parallel respectively, the two inner edge covering walls are fixedly extended to the outer edge covering walls respectively to form the first connecting edge and the second connecting edge, the first connecting edge and the second connecting edge are perpendicular to each other, the first connecting edge and the second connecting edge are perpendicular to the fixed outer edge covering walls respectively, the lengths of the first connecting edge and the second connecting edge are the same, the overall composite strength of the carriage is improved, and the traditional inner and outer installation is reduced to one-time installation forming.

The invention discloses a method for testing the composite strength of secondary particles, and relates to the technical field of new energy. The method for testing the composite strength of the secondary particles comprises the following steps: providing the secondary particles, measuring the average particle size Dv50 of the secondary particles, and recording the average particle size Dv50 as D1; preparing the secondary particles into a pole piece, and carrying out rolling treatment; recycling secondary particles in the rolled pole piece to obtain a recycled material, measuring the average particle size Dv50 of the recycled material, and recording the average particle size Dv50 as D2; the particle size change rate delta = (D1-D2) / D1 of the secondary particles is calculated and serves as the evaluation index of the composite strength of the secondary particles. According to the testing method provided by the embodiment of the invention, the composite strength of the secondary particles is evaluated through the particle size change rate before and after the pole piece is prepared, the method is closer to the actual use working condition of the material and is concentrated at the microscopic angle of particle size change, the real composite strength of the secondary particles can be judged more easily, testing operation and data processing are simple, and large-scale popularization and application are facilitated.

The present application relates to copper-aluminum composite plate strip technical field, especially a kind of copper-aluminum composite plate strip and production method, it is made of aluminum material and copper material composite, the oxygen content of copper material is 50ppm-500ppm, production method includes oxygen-increasing treatment to red copper or oxygen-free copper, the present application reduces the recrystallization temperature of copper material by increasing the oxygen content in copper material, in turn reduces annealing temperature, copper-aluminum composite blank heat treatment below 300 DEG C can satisfy copper material complete recrystallization, realize soft annealing, meet the demand of bending, while reducing the thickness of copper-aluminum intermetallic compound in heat treatment process, improve the composite strength of copper-aluminum composite plate strip.

The utility model relates to the technical field of aluminum-clad copper, in particular to an aluminum-clad copper composite plate strip with a stable structure, which comprises an aluminum strip and a copper strip, a groove is arranged on the aluminum strip, the copper strip is composited in the groove, a composite surface is arranged between the aluminum strip and the copper strip, the composite surface comprises a composite side surface and a composite bottom surface, and the composite surface further comprises an arc transition surface. And the arc transition surface is arranged at the intersection of the composite side surface and the composite bottom surface. The arc transition surfaces are arranged at the intersections of the composite side surfaces and the composite bottom surface, so that the stress is reduced, the aluminum-clad copper composite plate strip is not easy to break, the composite strength is improved, and the structural stability of the aluminum-clad copper composite plate strip is improved.

The invention discloses a production method of a high-composite-strength BOPA film. The BOPA film comprises a surface layer, a middle layer and an inner layer, and the surface layer is composed of PA6, melamine cyanurate, magnesium silicate, polytrimethylene terephthalate, POE-g-MAH and an antioxidant; the middle layer is composed of PA10 and PA12, multi-walled carbon nanotubes, pentadecyl phenol and surface modified cuprous oxide; the inner layer is prepared from PA6, glass fibers, phenolic resin, hollow glass beads, halloysite, an antioxidant and silicone. The BOPA film disclosed by the invention has relatively good composite strength.

The invention provides a paper-plastic sealing film as well as a preparation method and application thereof, and relates to the technical field of sealing films. The preparation method of the paper-plastic sealing film comprises the following steps: S1, coating one side of the paper base layer with a single-component polyurethane adhesive to form a first bonding layer, and carrying out primary compounding, rolling and primary curing on the printing layer and the first bonding layer; s2, the other side of the paper base layer is coated with a single-component polyurethane adhesive to form a second bonding layer, and the polyester film layer and the second bonding layer are composited for the second time, rolled and cured for the second time; and S3, coating the non-compounded side of the polyester film layer with the bi-component polyurethane adhesive to form a third bonding layer, compounding the polyolefin film and the third bonding layer for the third time, rolling, and curing for the third time. The flatness of the paper-plastic sealing film is remarkably improved, the composite strength is excellent, layering is avoided, and bubbles are avoided after heat sealing.

The application provides a preparation method of a multilayer lateral composite strip for a fuse, and specifically comprises the following steps: vacuum smelting and pouring oxygen-free copper into a plate with N square grooves, then putting silver blocks into the square grooves, heating under a protective gas, and then hot pressing by an extruder; then heating under a protective gas, opening and breaking by concave-convex rollers, milling off the upper and lower surfaces, and finishing rolling to a finished product. The square groove structure can accurately position the silver layer, save noble metals to the maximum extent, and ensure that the circuit protection equipment is cut off when an abnormal current appears in the circuit; through the concave-convex roller rolling composite, the problem of cracks generated between the silver and copper interfaces and the poor lateral bonding strength can be effectively solved, so that the bonding strength is firm and reliable, the lateral composite strength is high, and the yield is high. Moreover, the strip manufactured by the method has stable performance and can be mass-produced.

The application relates to the field of packaging material manufacturing, in particular to a packaging material manufacturing process for a heating bag, which specifically comprises the following steps: coating and drying AC agent on a non-woven fabric composite surface; cooling the non-woven fabric composite surface, then performing a second base material film coating treatment, and pressing and cooling the second base material; hot sealing a third base material to the second base material to form a three-in-one fabric; and performing printing, anti-static agent coating and punching treatment on the three-in-one fabric, so that the non-woven fabric and the second base material can have better initial composite strength.

The invention provides a melt-blown and carded fiber web gradient spunlace composite electret filter material and a preparation method thereof, and relates to the technical field of filter materials. The preparation method comprises the following steps: (1) feeding fibers into an opener for opening to obtain scattered fibers, carding the scattered fibers through a carding machine to obtain single fibers, and arranging the single fibers into a fiber web to form a carded cross web I or a carded straight web II; (2) unwinding melt-blown cloth, flatly laying the melt-blown cloth on a carding cross-laying net I, and flatly laying a carding straight-laying net II on the melt-blown cloth to obtain a composite fiber net; and (3) pre-wetting the composite fiber net, and sequentially carrying out spunlace compounding, spunlace electret compounding, drying and corona electret to obtain the target filtering material. According to the invention, the fluffy fiber net and the melt-blown fiber net cloth are carded for spunlace compounding, so that the fiber net and the melt-blown fiber can be mutually entangled, interspersed and cohered, the compounding strength is high and the filter material is not easy to layer under the condition that a chemical adhesive is not needed, and meanwhile, the filtering performance of the filter material is improved.

The present invention proposes a copper-aluminum composite plate prepared by continuous casting with molten aluminum, and a process for producing the same, which belongs to the technical field of composite plates. The process includes the steps of (S1) heating an aluminum ingot to 700-800°C and smelting it for 1-3 hours, (S2) degassing the smelted molten aluminum and leaving it at that temperature, (S3) texturing and cleaning a copper strip, (S4) heating the pre-treated copper strip to 200-650°C, (S5) continuously casting the molten aluminum onto the treated copper strip under inert gas protection, quenching and crystallizing the copper-aluminum composite material, and performing oxygen-free continuous casting, and (S6) continuously rolling the continuously cast copper-aluminum composite material and continuously casting it with molten aluminum to obtain a copper-aluminum composite plate. The copper-aluminum composite plate prepared by the present invention, which is produced by continuous casting of molten aluminum, has improved wettability at the metal interface between aluminum and copper, high bonding strength, small interfacial thickness, high composite strength, good mechanical properties, low cost, high efficiency, and wide applicability.

The utility model discloses a multi-position spraying piece type spraying glue gun which comprises a glue gun main body, a mounting seat and a spraying gun mold, one side of the surface of the glue gun main body is provided with the mounting seat and is detachably connected with the spraying gun mold through the mounting seat; a glue spraying head is arranged at the bottom of the spray gun mold, a glue inlet pipe extending into the glue gun body is installed at the feeding end of the spray gun mold, a connecting base is detachably connected to the top of the glue gun body, and an air supply base is arranged at the top of the glue gun body. Only a spiral glue spraying mode is needed for common glue consumption, the use cost is reduced, middle-low-speed or high-speed intermittent and continuous glue spraying work can be conducted, sprayed glue is in a fiber shape, fine, high in adhesive force, uniform in distribution, high in strength, resistant to abrasion, high in durability, high in structural design and convenient to refit, and the service life is prolonged. The device can be refitted and applied to hot melt glue machines of all brands in the world according to user requirements.