39results about How to "Reduce cracking rate" patented technology

The invention discloses a watermelon plastic film full-mulching cultivation method. The watermelon plastic film full-mulching cultivation method comprises a first step of preparing a land and sowing laguminosae, a second step of evening the laguminosae, a third step of conducting irrigation and covering plastic film, and a fourth step of growing watermelon seedlings and conducting filed management. According to the watermelon plastic film full-mulching cultivation method, due to the fact that the land is fully covered by the two-color plastic film, the two-color plastic film has the effects of restraining weeds and avoiding aphids, the aphids and other insects are effectively prevented from spreading diseases, the land temperature inside a ridge is rapidly improved, and effective degradation of green manure plants is improved. Due to the fact that quick lime is applied, soil acidification can be effectively relieved, the calcium content of soil can be increased, and the rate of watermelon cracking in the watermelon mature period is reduced. Due to the fact that a layer of dry straw covers the plastic film arranged between every two ridges, moistures is absorbed, the dryness degree inside a green house is improved, fixation of watermelon vines is facilitated, and watermelon growth is facilitated. The incidence of fusarium wilt is reduced by 96% compared with that of the prior art. The quality of watermelons is remarkably improved. The sugar degree of each watermelon is increased by 1%-3%. The yield is increased by 200%-600% compared with that of the prior art.

The invention discloses a solar cell electrode printing method. The method comprises the following steps of cleaning and texturing, diffusion, laser doping, oxidation, back oxide layer removal, alkalipolishing, film coating, laser grooving and printing, a silicon nitride film is plated on the surface of a silicon wafer during film coating, and the thickness of the back silicon nitride film is 70-80 nm; laser grooving is carried out on the back face of the silicon wafer to obtain a positioning point, the vertical distance between the highest point of a fusion protrusion of the positioning point and the back face of the silicon wafer is not larger than 10 [mu]m, and a red light lamp is adopted in a printing machine for printing back face electric field slurry. When the method is used in laser grooving, local ablation and the protruding degree caused by positioning point punching are reduced by setting relevant technological parameters of the positioning points on the back face of the silicon wafer, so that the subfissure probability of a battery piece is reduced, and damage of the positioning points to a screen printing plate of a printing machine is reduced.

The invention discloses a preparation method for a back electrode of a solar battery. The preparation method includes that using soldering flux to form a soldering flux belt at the surface of an aluminum back field, forming a non-silver metal solder belt at the surface of the soldering flux belt, wherein the soldering flux belt can break an alumina film at the surface of the aluminum back field to expose fresh aluminum from the surface of the aluminum back field, the subsequently fed non-silver metal wires (solder) are melted by the heat effect of a soldering head, the molten liquid fuses with the aluminum, the molten solder is well bonded at the surface of the aluminum back field, the silver use is avoided, the cost is lowered, an ultrasonic vibration device is not used, the intensity of a finished product is obviously improved, fragment and crack are obviously reduced, and the quality of the back electrode of the solar battery is greatly improved. The back electrode of the solar battery prepared by the preparation method is low in fragment and crack rate, the adhesion between the back electrode and aluminum back field is strong, the welding with a photovoltaic soldering belt is good, the average photoelectric efficiency conforms to requirement, and the manufacturing cost is low.

The invention discloses a variable water ratio control method of the secondary cooling of a billet caster which can reduce the inner crack rate of casting blanks. The control method can realize that the water flow rate delta and the total amount of water Q increase by stages with the increasing of the casting speed V of casting blanks, namely when the casting speed V of casting blanks is 0-2m / min, the water flow rate delta is 1.35-1.39L / kg, the functional relationship between the secondary cooling total amount of water Q and the casting speed V of casting blanks is Q = 13.8-14.3V; when the casting speed V of casting blanks is 2-2.4m / min, the water flow rate delta is 1.58-1.64L / kg, the functional relationship between the secondary cooling total amount of water Q and the casting speed V of casting blanks is Q = 16.2-16.8V; when the casting speed V of casting blanks is 2.4-2.8m / min, the water flow rate delta is 1.67-1.71L / kg, the functional relationship between the secondary cooling total amount of water Q and the casting speed V of casting blanks is Q = 17.1-17.5V; when the casting speed V of casting blanks is 2.8-3.0m / min, the water flow rate delta is 1.73-1.76L / kg, the functional relationship between the secondary cooling total amount of water Q and the casting speed V of casting blanks is Q = 17.7-18.1V; and when the casting speed V of casting blanks is 3.0-3.6m / min, the water flow rate delta is 1.8-1.86L / kg, the functional relationship between the secondary cooling total amount of water Q and the casting speed V of casting blanks is Q = 18.5-19.1V.

The invention provides a curing agent for making bricks after curing water-based drilling cuttings as well as a preparation method and application of curing agent. The invention relates to the technical field of environment-friendly treating of oil field water-based drilling cuttings. The curing agent comprises 2%-5% of a solid surfactant, 30%-50% of industrial waste residues, 30%-50% of cement, 5%-10% of plant shell and 3%-5% of inorganic salt. According to the curing agent, the industrial waste residues such as coal gangue and the like are used, waste is treated with waste, the plant shell and the solid surfactant are introduced, the problems that the sintered brick prepared from the cured water-based drilling cuttings is prone to crisping, high in moisture content, adhesive and the likeare solved, the cured water-based drilling cuttings can be recycled to be used for preparing the sintered brick, and the practical value and the popularization prospect are achieved.

The invention discloses a rotating shoulder-expanding stable pulling-up method for large-kilogram sapphire crystals. The method comprises the steps as follows: heating for material melting to enable the raw materials to be just melted and enable the temperature of the melted material to be close to a melting point; lowering a crystalline style, and preheating a seed crystal mounted below the crystalline style; measuring temperature to adjust and control the temperature of the melted material to a crystal growth temperature; seeding, to be specific, placing the clean seed crystal above liquid level in a standing manner to enable the surface of the seed crystal to melt, rotating the crystalline style, and actuating the seeding process after an artificial cold-core is formed; actuating an automatic shoulder-expanding procedure, lifting the crystalline style at uniform speed, adjusting the power of a heater to lower the temperature gradually, at the same time, keeping the rotation of the crystalline style, stopping rotation when the weight of the crystal reaches 5 kg, enabling the rotating speed of the crystalline style to gradually decrease by stages when the weight of the crystal is 0-5 kg; actuating an automatic growing procedure when the weight of the crystal reaches 10 kg, lifting the crystalline style at uniform speed, adjusting the power of the heater to lower the temperature gradually; finally, separating, cooling, and taking out the crystal, so that the whole crystal growing process is completed. Through the method provided by the invention, the seeding and shoulder-expanding method in the prior art are improved, and the finished product rate as well as the yield are improved.

The invention provides a seedless watermelon anti-dehiscence method. According to the anti-dehiscence method, after a seedless watermelon grows to a fruit swelling period, a seedless watermelon anti-dehiscence agent is sprayed. The anti-dehiscence agent is prepared from ammonium molybdate, pectin, xylanase, calcium superphosphate, serine protease, astragalus polysaccharide and water. By the adoption of the seedless watermelon anti-dehiscence method, the fruit dehiscence rate of the planted seedless watermelon is lowered to 3.07-9.39%o.

The invention provides a seedless watermelon anti-dehiscence method. According to the anti-dehiscence method, after a seedless watermelon grows to a fruit swelling period, a seedless watermelon anti-dehiscence agent is sprayed. The anti-dehiscence agent is prepared from ammonium molybdate, pectin, xylanase, calcium superphosphate, serine protease, astragalus polysaccharide and water. By the adoption of the seedless watermelon anti-dehiscence method, the fruit dehiscence rate of the planted seedless watermelon is lowered to 3.07-9.39%o.

The invention provides an adhesion method for a crystal bar. The method comprises the steps that before the adhesion of the crystal bar and a bearing plate, adhesives are applied on the crystal bar in advance to form an adhesive layer, and after the adhesive is solidified, adhesion is conducted on the crystal bar with the adhesive layer and the bearing plate by applying the adhesive for a second time. The adhesion method for the crystal bar is simple and efficient, cracks on the adhesive surface of the crystal bar can be reduced, adverse effects caused by the empty adhesive phenomenon are eliminated, the breakage and hidden crack rate in silicon wafer cutting process is further reduced, and the yield of silicon wafers is improved.

The invention discloses a coating, a raw material composition, an investment casting mold shell and a preparation method and application of the investment casting mold shell. The raw material composition of the coating comprises the following components in parts by weight: 100 parts of silica sol, 200-500 parts of solid particles and 20-70 parts of aluminum dihydrogen phosphate, wherein the solid particles comprise a silicon-aluminum refractory material and a plastic material, the silicon-aluminum refractory material comprises a powder material of 200-400 meshes and an aggregate of 10-60 meshes, and the weight ratio of the aggregate to the powder material to the plastic material is 1: (1.5-3): (2.5-4); the particle size of silicon dioxide in the silica sol is 20-40nm. The coating is used for reinforcing the shell of the large precision casting, so that the strength of the shell is greatly improved under the condition of conventional shell layers, the shell explosion rate is reduced, and the coating is particularly suitable for casting of the large precision casting.

The invention discloses a method for heat-treating eccentric bodies of a multi-link press. The method comprises the following steps: placing the eccentric bodies of the multi-link press in a heating furnace; heating to 550 to 570 DEG C, and holding for 4 to 6 hours; then, placing the eccentric bodies in a heating furnace where the furnace temperature is lower than 400 DEG C, and holding for 2 hours; heating to 600 to 650 DEG C and holding for 2 hours; further heating to 880 to 900 DEG C, holding for 5 to 7 hours, discharging and cooling to the room temperature with compressed gas; and finally, placing the eccentric bodies in the heating furnace where the furnace temperature is lower than 400 DEG C, holding for 2 hours, heating to the tempering temperature of 550 to 570 DEG C, holding for 5 to 7 hours, then, discharging and naturally cooling. The invention has the following beneficial effects: (1) the cracking rate of the eccentric bodies of the multi-link press is reduced and the qualification rate is improved; and (2) the strength and the hardness of the eccentric bodies thereof are increased, thereby meeting the actual requirements for production.

The invention provides a method and device for reducing subfissure of a straightened silicon core rod crystal, and the method comprises the following steps: introducing cooling water into single crystal furnace equipment for preparing the silicon core rod crystal, so that the temperature of the single crystal furnace equipment is controlled within a preset range; a curing felt and a heat shield device are arranged at the upper part of a guide cylinder of the single crystal furnace equipment; starting the single crystal furnace equipment to enter a crystal growth stage; after the crystal growth stage is completed, the prepared silicon core rod crystal is separated from the liquid level to a preset height, meanwhile, the power of the single crystal furnace equipment is reduced, and after the silicon core rod crystal is cooled for a preset time, the power is turned off; the silicon core rod crystal needs to stand within a preset time and is discharged out of the furnace. By means of the method for reducing the subfissure of the straightened silicon core rod crystal and the device for executing the method, the defects of subfissure, cracks and the like in the straightening process of the silicon core rod crystal are effectively reduced, the prefabrication process of the silicon core rod crystal is not limited to single crystals, and therefore the difficulty of preparing the silicon core rod crystal is reduced.

The invention provides a heat-dissipating packaging adhesive film and a preparation method thereof. The heat-dissipating encapsulation adhesive film includes a base resin, a phase-change material / heat-conducting filler compound, an initiator and a cross-linking agent dispersed in the base resin. The invention effectively solves the problem that the heat dissipation packaging method of solar photovoltaic modules in the prior art cannot simultaneously take into account heat dissipation, cell cracks, photoelectric conversion efficiency, electrical conductivity safety, anti-PID performance and other aspects. Good, good packaging performance after being applied to solar photovoltaic modules, high conductive safety, high photoelectric conversion rate, good anti-PID performance, low cost, and broad application prospects.

A photovoltaic cell component and a production method thereof belong to the field of crystalline silicon solar cells, and in particular relate to a novel photovoltaic cell and component electrical connection method. The invention provides a photovoltaic battery module with low cost, low debris rate in the production process, improved power generation efficiency and product quality and a production method thereof. The photovoltaic cell assembly of the present invention includes a battery sheet, and is characterized in that: the battery sheet is only provided with auxiliary grid lines, and no main grid lines are provided; the battery sheet is provided with filamentary conductive materials perpendicular to the auxiliary grid lines.