493 results about "Vacuum cooling" patented technology

The present invention is wear-resistant wood-plastic floor board and its production process, and belongs to the field of decoration material technology. Polyvinyl chloride resin or plastic material is added with waste wood powder or fiber material powder, active calcium carbonate, assistant, stuffer, etc, and the mixture is pelletized, and further treated through extruding, molding, vacuum cooling, settling, drawing and cutting to form the basic wood-plastic board. The basic wood-plastic board is polished, groove milled and covered with surface decoration layer to form the wear resistant wood-plastic floor board product. The wear resistant wood-plastic floor board is beautiful, wear resistant, fireproof, waterproof, non-skid, anticorrosive and environment friendly and has high strength, heat insulation, electrical insulation and other advantages.

The invention discloses a kind of window PCE shaped material with antistatic and dustproof function and its manufacturing method. It raw materials are composes of PVC resin powder, antistatic agent, impact modifier, stabilizer, filler and processing aid in accordance with the weight ratio of 100:0.2-20:1-10:2-8:5-20:1-10. Then it heats and stirs the raw materials at a temperature of 100 ~ 130deg.C in the high-speed mixer, and then it slowly cools the mixture to room temperature and transfers the materials to the extruder, finally it achieves the shaped material through extrusion molding mold, vacuum cooling, traction and cutting.

A method for preparing potassium nitrate and ammonium chloride employing double decomposition reaction comprises the following steps: dissolving ammonium nitrate and potassium chloride in water according to a defined ratio at 110 DEG C, continuously adding potassium chloride and water, heating while stirring to ensure that potassium nitrate is in supersaturation state, after stopping heating, cooling the solution in a vacuum cooling crystallizer to 36-40 DEG C to separate potassium nitrate crystal, placing the potassium nitrate crystal in a centrifugal machine with a filter cloth lining to obtain coarse potassium nitrate, then washing the potassium nitrate with cold water, drying to obtain the finished potassium nitrate; in addition, adding ammonium nitrate in mother solution I and cleaning solution to adjust solution concentration so that ammonium chloride can reach supersaturation state, using a vacuum concentration device to perform negative pressure evaporation, separating and precipitating ammonium chloride by centrifuging and obtaining a solid ammonium chloride product, wherein, when dissolving ammonium nitrate and potassium chloride, the ratio of ammonium ion to chlorine ion is 1:2 and when using the centrifugal machine to obtain the coarse potassium nitrate, the separated mother solution is another mother solution I sharing the same saturation point of potassium nitrate and ammonium chloride. The solution of feed liquid circular reaction overcomes the defects of the prior art that the price of potassium nitrate used in reaction is high, the resource of potassium nitrate is in short supply and the cost of devices used in ion-exchange method is high, thus being applicable to the production of potassium nitrate.

The invention relates to a craftwork for producing the industrial-level monoammonium phosphate consecutively with the phosphoric acid by wet process, which adopts the following steps: 1) phosphoric acid and phosphorite pulp are desulfurized to get the desulfurized phosphoric acid; 2) the acid is undertaken the first neutralization action to get a neutralized material pulp clarifying solution; 3) after the second neutralization reaction, the solution is reacted with the desulfrized phosphoric acid to get a secondary neutralized material pulp with the pH value being adjusted; 4) the secondary neutralized material pulp with the pH value being adjusted is primarily filtered to get a primary filtering solution and a primary filtering mass; 5) the primary filtering solution is secondarily concentrated and press filtered to get the secondary filtering solution; 6) the obtained secondary filtering solution is dissolved through the grain refining, is cooled down in vacuum, is crystallized, is centrifugally separated and dried to get the finished product of the industrial-level monoammonium phosphate. The invention has the advantages that the operation during the production process is consecutive; the labor intensity of the worker is reduced; the leakage rate of the ammonia is low and the loss is small; the secondary neutralized raw material solution is clear solution, so that the viscosity is low and the loss of the ammonia is small; the neutralization and the press filtering load is reduced; the crystallization production capacity is large; the heat energy is adequately used, thereby reducing the consumption of the vapor.

The invention provides a process for separating out high-purity ammonium salt and sodium salt by combining evaporation concentration crystallization and cooling crystallization aiming at wastewater comprising high-concentration ammonium salt and sodium salt according to characteristic difference that solubility of the ammonium salt and the sodium salt varies along with temperature. In the process, the wastewater is pretreated, molar weight proportion of Cl<-> and NH<4+> in the wastewater is adjusted, and high-purity sodium salt and ammonium salt are recovered by high-temperature evaporation concentration crystallization and vacuum cooling crystallization respectively. The wastewater which is subjected to evaporative condensation is recycled in a production system, and the separated ammonium salt and sodium salt are used by factories as raw materials, so the comprehensive utilization and absolute treatment of a wastewater resource are ensured, and economic benefit and social benefit of the factories are improved. The process is suitable for treating the wastewater which comprises high-concentration ammonium salt and sodium salt and is produced in wet metallurgy enterprises and salty chemical enterprises.

The present invention relates to a three-stage combined pretreatment method for prolonging fresh-keeping period of putrefactive fruit and vegetable. Said method includes the following processes: according to conventional method selecting fruit and vegetable, washing and grading, controlling water content, quickly vacuum cooling so as to reduce respiration action of fruit and vegetable, utilizing high-pressure mixed gas to make water content be structured to deactivate enzyme activity of fruit and vegetable, finally applying nano silver antibacterial film to reduce putrefactive rate of fruit and vegetable so as to implement invented goal.

The invention relates to a method for manufacturing a composite light wall made from WPC material/ rigid foam. The method comprises two procedures of the molding of the outer layer of a hollow wall member and the on-site filling of a core layer. After being mixed and plasticated, wood fiber material, polymer material, various accessory ingredients and additives are made into the granular WPC material by a screw extruder. After being added into the screw extruder, the granular material is made into the outer layer of the wall member. With the completion of processes of hand piece, vacuum cooling, shaping, traction and cutting, the outer layer of the hollow wall member is obtained. A froth placer is used for performing on-site rapid rigid aeration for polyurethane material that is filled into the outer layer of the wall member, thus making a composite light wall plate made from the WPC material/rigid foam. The method for manufacturing the composite light wall made from the WPC material/rigid foam avoids the problem that the core layer and the outer layer of the wall member can not be extruded simultaneously and the core layers with different densities can be filled and foamed according to the strength of the wall member and on-site requirements, thus ensuring the transverse compressive strength of the wall member. The method for manufacturing the composite light wall made from the WPC material/rigid foam is convenient and flexible and has wide application range.

A portable, durable, lightweight cooler system designed to maintain beverages, food, medical supplies, drugs, and other heat sensitive products at existing temperatures with substantially reduced heat gain or loss from the surrounding environment for extended periods of time, when no power source is available. This container is designed to greatly reduce radiant heat transfer along with conductive and convective heat transfer while diminishing decomposition effects of stored items and thus maintaining freshness. This system includes a cooler housing, a reinforced lid, a radiation reflective material application, and a system to remove air from the containment area, thus creating a vacuum within the cooler itself and sealing the lid to the cooler housing. Upon actuation of a vacuum release device, air is reintroduced into the containment area thus allowing the lid to be removed and the stored products be accessed.

The invention provides a method for preparing electronic-grade selenium-free trimanganese tetroxide with rhodochrosite as raw material. The method uses the rhodochrosite as the raw material; a mixture of manganese hydroxide and manganese carbonate is obtained through a manganese leaching process and an impurity removing process; through washing, dehydration, drying, roasting, vacuum cooling technical treatment and refining treatment, the electronic-grade selenium-free trimanganese tetroxide with gamma-type atoms in disorderly arrangement can be obtained. As the low-grade rhodochrosite raw material used in the method is low in price, the method is low in production cost and high in product purity, and raises the utilization ratio of manganese ore resources. Compared with a method using electrolytic manganese as the raw material to produce trimanganese tetroxide, the method of the invention reduces equipment investment, production cost and power consumption respectively by 40 percent, 40 percent and 80 percent.

The invention belongs to the technical field of edible fungus and particularly relates to continuous edible fungus sterilizing equipment. The continuous edible fungus sterilizing equipment comprises a spiral feeding machine, an edible fungus sterilizing, cooling and inoculating all-in-one machine, a storage warehouse and a bagging machine, wherein the edible fungus sterilizing, cooling and inoculating all-in-one machine comprises a transversely-arranged cylindrical shell; a stirring device is arranged in the cylindrical shell; a jacket is arranged on the cylindrical shell; a steam inlet, a cooling water outlet, a condensed water outlet and a cooling water inlet are formed in the jacket; a steam inlet and a fungus adding opening are formed in the cylindrical shell; the cylindrical shell is communicated with a vacuum cooling system; a discharging opening of the cylindrical shell is communicated with a feeding opening of the storage warehouse; a discharging opening of the storage warehouse is communicated with a feeding opening of the bagging machine. According to the continuous edible fungus sterilizing equipment provided by the invention, only one equipment space is needed in the edible fungus sterilizing, cooling and inoculating processes, so that the space is saved, the continuous production is realized, the labor efficiency is greatly improved, the labor strength is reduced, the energy consumption is reduced, and the ambient air pollution is eliminated.

The invention provides a method of extracting natural plant dye, which uses dye-containing plant as raw material to obtain pulverulent natural plant dye by water extraction, vacuum cooling and drying. The method includes steps: (1) abstraction: weight ratio of water and plant of 1:5-15, extraction temperature of 40-90 DEG C, extraction time of 20-60 min, extraction frequency of 1-3, combining extraction liquid; (2) precooling: temperature of minus 20 - minus 50 DEG C, time of 1-5 h; (3) vacuum freeze drying: temperature of minus 45 - minus 55DEG C, vacuum degree of 10-20Pa, time of 15-20 h. Outstanding character of the invention is: 1. preparing pulverulent product and not destructing original biochemical property of natural plant dye; 2. solving problem of bad staining reproducibility of natural plant dye liquid extracted by existent technique and increasing staining reproducibility of the natural plant dye liquid; 3. solving problem of conservation of the natural plant dye liquid and capable of storing the natural plant dye liquid for a long time.

The invention discloses a production process of refined potassium chloride, in particular to a process for refining 90% potassium chloride into more than 97% food grade potassium chloride. The process comprises the following steps of: adding 90% potassium chloride into a potassium chloride saturated solution (circulating solution) at room temperature to obtain a supersaturated solution; filtering the supersaturated solution by using a coarse filter, heating to 100-105 DEG C, and fully dissolving potassium chloride; filtering the high temperature saturated solution by using a heat insulating filter to obtain a refined saturated solution; cooling and crystallizing the refined saturated solution by a vacuum cooling crystallizer, dewatering by a centrifugal machine, and drying by a drying bed to obtain refined food grade potassium chloride, and returning the mother solution separated from the centrifugal machine back to the system to be used as a circulating solution. The method can be used for effectively removing soluble impurities and insoluble substances in the 90% potassium chloride product, and the content of the product achieves more than 97% and reaches the standard of food grade potassium chloride. The invention has the advantages of simple equipment, short process flow, no environment pollution and easy realization of industrialization.

The invention discloses a processing method of freshwater crayfish pre-prepared products. The method includes the steps of firstly, selecting and grading; secondly, cleaning; thirdly, frying; fourthly, vacuum cooling; fifthly, soaking with seasoning liquids; sixthly, nitrogen-filled packing; seventhly, quick-freezing; eighthly, performing cold storage. The method has the advantages that the crayfish is soaked with special cleaning fluids to allow the crayfish to spit out dirt in the intestine line, and complex manual intestine line removing is avoided; high-temperature fast frying and special soaking with special seasoning liquids are used, and the difficulties that crayfish meat protein deteriorates easily, flavor substances lose easily and flavor cannot enter the crayfish in subsequent processing are solved; the vacuumizing and nitrogen filling freshness keeping technology is used, and the crayfish is prevented from being oxidized by oil acid during storage.

Edible fungus antistaling method and apparatus are disclosed. The method includes dehumidifying fresh edible fungus with circulating wind inside a sealed vacuum processing chamber to reach set temperature and water content, and fast vacuum freezing to further eliminate water of edible fungus. The said method can maintain the metabolism of edible fungus and reach required temperature and water content of edible fungus without contamination and damage to look of edible fungus. The method and apparatus has low power consumption, results in homogeneous temperature and water content inside and outside the edible fungus, controls water content in edible fungus in 70-88 % and makes edible fungus capable of being preserved and transported at low temperature for long period.

The invention relates to a drum-type vacuum cooling dryer which comprises a circular drying drum, a heat insulation layer, an electric heater, a refrigerating unit, a cold trap and a vacuum pump. One end of the drum is provided with a drying-drum transmission shaft while the other end is provided with a sealing door; the end of the drying drum with the sealing door supports against a rotatable roller of the drying drum; a vacuumizing port communicating with the inside of the drying drum is arranged inside the drying-drum transmission shaft, and the tail end of the drying-drum transmission shaft is provided with a movable vacuum sealing assembly communicating with the vacuumizing port; a movable vacuum sealing element is arranged in the movable vacuum sealing assembly; the heat insulation layer wraps around the drying drum and is not in contact with the drying drum; the electric heater is arranged between the heat insulation layer and the drying drum; and the refrigerating unit, the cold trap and the vacuum pump are mutually connected by vacuum pipes. The drum-type vacuum cooling dryer has high drying speed, uniform drying and low drying cost.

The invention discloses a diffusion welding process for a heat exchanger core. The diffusion welding process comprises the following steps: (1) pre-welding pre-treatment: feeding the well assembled heat exchanger core into a diffusion welding furnace, and vacuumizing the interior of the furnace to be below 0.01 Pa; (2) diffusion welding: raising the temperature to 800-850 DEG C at the speed of 15-20 DEG C/min, keeping the temperature for 30 min, after that, raising the temperature to 1,100-1,150 DEG C at the speed of 10-15 DEG C/min, keeping the temperature for 3 h, and performing vacuum cooling to the room temperature, wherein the pressure (8-9.5 MPa) exerted before is kept in the first 2 h and reduced to 4-6 MPa in the last 1 h; and (3) postweld heat treatment: raising the temperature of the heat exchanger core to 1,150-2,000 DEG C, keeping the temperature for at least 20 h, and after that, reducing the temperature in a water quenching manner. According to the diffusion welding process, such parameters as welding temperature, diffusion time and pressure are controlled, the step of heat treatment after diffusion welding is added, so that brittle phases easily generated during diffusion welding are reduced, and the quality of a welded joint of the heat exchanger core is improved.

The industrial process of producing pot-stewed meat food includes the following steps: pre-treatment of material, scalding, pot-stewing in soy sauce, vacuum cooling in a constant temperature cleaning shop to below 10 deg.c, cutting with a high speed slicing machine in a constant temperature cleaning shop, weighing and packing in box, and final packing in an air conditioning and preserving package machine. The present invention has high production efficiency, and the pot-stewed meat food has stable quality, long preservation period and other advantages.

The invention discloses a production technique of EPS (expandable polystyrene) foam articles. The production technique is characterized by comprising the following steps: pre-foaming, curing, feeding, preparing mould, heating and forming, water cooling, vacuum cooling, demoulding, trimming, drying, trimming, packaging and storing in warehouse, and the production technique improves the compressed air, water circular cooling and drying process. The technique disclosed by the invention has simple and reasonable technique procedures and utilizes two paths of compressed air supply systems, so that the pipeline pressure is very stable, an electromagnetic valve acts flexibly, a cylinder switching valve quickly and reliably acts, and a cooling water circulating system can quickly cool to improve the cooling efficiency, save the electric energy and vapor and reasonably utilize the energy sources; besides, a mixed mode of high and low temperature air is used, so that the articles are not deformed or expanded irrespective to the foaming density, the drying time is shortened and the resources are reasonably utilized.

A processing method for prolonging shelf life of instant box convenience rice at normal temperature belongs to the technical field of deeply processing agricultural products. By adopting staging vacuum fast cooling technology and high-power electron beam cold sterilization technology, the processing method mainly comprises the steps of: selecting rice with proper amylose as raw materials, conducting cleaning and soaking, stewing, staging vacuum cooling and packaging sealing, and then carrying out high-power electron beam sterilization, thus obtaining instant box convenience rice capable of being stored for nine months at normal temperature. The processing method has the advantages that: the stewed rice is fast cooled by adopting a vacuumizing method, thus being capable of not only reducing aging of instant convenience rice, but also removing moisture on the surface of the product, and reducing secondary pollution probability of microorganism; cold sterilization to the instant convenience rice by adopting high-power electro beam processing can leads the product to be sterile, thus not only improving the shelf life of the product, but also leading the product to have no high-temperature treated can taste or stewing taste compared with the existing high-temperature sterilization technology, and further being capable of better showing the characteristics of original color, fragrance and flavor of the fresh rice.

The invention discloses a preparation method for high magnetic conductivity soft magnetic alloy composite materials, comprising the followings steps: firstly, ferrum, aluminum, silicon and titanium with a purity more than 99.9 weight percent are taken as raw materials and laid into a medium frequency vacuum induction furnace for smelting, and a master alloy is obtained; secondly, the master alloy after smelting is laid into a quick quenching device; an alloy ingot casting is quickly poured on a water-cooling roll wheel which rotates at high speed after arc remelting under the protection of high purity inert gases, and a quickly condensed sheet band or a quickly condensed sheet is obtained; thirdly, flat processing is performed by adoption of the ball milling technology, and flat powder is obtained; fourthly, the flat powder is laid into a stainless steel tube which is then vacuumized and filled with inert protective gases, and then the stainless steel tube is laid into a tube furnace for heating and cooling along with the furnace; fifthly, the flat powder and binding agents are mixed and milled for processing the flaky high magnetic conductivity soft magnetic materials which are then laid into a heat treatment furnace for heating, heat preservation and vacuum cooling. The preparation method for the high magnetic conductivity soft magnetic alloy composite materials is simple in technology and suitable for large-scale mass production; a magnet has high magnetic conductivity; the magnetic shielding effect is greatly improved.