35 results about "Permeability index" patented technology

A water-absorbent sheet composition containing a structure in which an absorbent layer containing a water-absorbent resin and an adhesive is sandwiched with two or more sheets of hydrophilic nonwoven fabrics, wherein the water-absorbent sheet composition has a structure in which the absorbent layer is separated in divided parts of a primary absorbent layer and a secondary absorbent layer with a water-permeable substrate having a water permeability index of from 20 to 90, and wherein the water-absorbent resin is contained in the absorbent layer in an amount of from 100 to 1000 g / m2. The water-absorbent sheet composition of the present invention exhibits some excellent effects that the water-absorbent sheet composition is capable of accomplishing thinning and avoidance of gel blocking phenomenon and liquid leakage, while obtaining basic properties as a water-absorbent sheet composition at a high level, even for a water-absorbent sheet composition containing a very small amount of pulps.

The invention provides a quantitative evaluation method of an oil reservoir water flooded layer. The quantitative evaluation method comprises the steps that an oil-water relative permeability curve ofa core sample is measured; irreducible water saturation S<wi> and residual oil saturation S<or> of the core sample are obtained, and a movable oil index K<o> and a movable water index K<w> of the core sample are calculated; a K<ro>-K<o> curve and a K<rw>-K<w> curve of the core sample are drawn in a simulated mode; a to-be-evaluated core sample of a target oil reservoir water flooded layer is taken, the irreducible water saturation S<wi>, the residual oil saturation S<or> and water saturation S<w> of the to-be-evaluated core sample are obtained, the relative permeability index K<rf> of the to-be-evaluated core sample is solved, and then the water flooded layer of a target oil reservoir is quantitatively evaluated. According to the quantitative evaluation method, the seepage characteristicsof a reservoir are taken as the basis, core relative permeability testing data serve as the basis, and the trend of the oil-water relative permeability curve changing with the water saturation is analyzed; and based on this, the oil-water relative permeability index is constructed to represent the water flooding degree of the oil reservoir, a logging interpretation model of the oil reservoir is established, and the oil reservoir water flooded layer is evaluated more accurately.

A test device and a test method for measuring aggregative permeability index of a sinter bed belong to the technical field of measuring sinter. The device comprises a main cup, an assistant cup, an exhaust base, an exhaust fan with a frequency conversion instrument, a pressure sensor, a mass flow sensor and a meter. The test method comprises the steps of respectively filling the main cup with grate layer materials and sintered mixing materials, turning on the exhaust fan to start an air regulation process, measuring the permeability index of a material bed by the minute with a permeability index formula during the process of gradually increasing the exhausted air flow from 0 to a preset upper limit air flow, and calculating the aggregative permeability index of the material bed with an aggregative permeability index formula after turning off the exhaust fan when the exhausted air flow reaches the upper limit air flow. The invention has the advantages that the fringe effect of the material bed is decreased, the permeability of the sinter bed can be truly and exactly reflected, and the permeability of the sinter beds with different height can be measured with higher flexibility. Thedata from the whole test procedure is collected by the meter so the comparable property of the test result can be greatly promoted.

The invention provides a method and a device for detecting the air permeability of tipping paper. A light source with high stability and uniformly distributed light intensity is adopted to directly irradiate the perforated tipping paper which moves at a high speed; a photoelectric sensor is arranged at a position below the tipping paper, which is over against the light source; light is directly focused on the photoelectric sensor through a hole on the tipping paper; the amount of the air permeated correspondingly to the air permeability of the tipping paper is converted into the intermediate variable luminous flux; the luminous flux is directly measured by the photoelectric sensor; a corresponding value relation between the air permeability of the tipping paper and the luminous flux is prestored in a database; after the measured luminous flux, i.e. real-time luminous flux data, is transmitted to a processing system, the value of the luminous flux can be compared from the database in which the data is prestored by the processing system, so that the air permeability of the corresponding perforated tipping paper is obtained, and thus, the whole-course real-time detection on the air permeability of the perforated tipping paper which moves at the high speed can be realized, an air permeability index of a product is accurate and reliable and the quality is effectively ensured.

The invention discloses a method for the large-proportion utilization of lump ores for a blast furnace. The method comprises the following steps: step 1, testing the high-temperature metallurgy performance of the lump ores to be put into the blast furnace, and selecting the condition-satisfied lump ores; step 2, sufficiently mixing the selected lump ores with nut coke at a mass ratio of (6-25):1,so as to obtain a mixture; and step 3, adding the mixture obtained in step 2 into a middle ring belt of the blast furnace at a mass ratio of the consumption of the lump ores in each batch of furnace charge to each batch of the furnace charge, putting the furnace charge into the blast furnace, and carrying out smelting, wherein the mass ratio is set to (1-3):10. According to the method disclosed bythe invention, the lump ores are put into the blast furnace in batches, so that the proportion of the lump ores being put into the blast furnace can be extremely improved under the premise that the stable and smooth running of the blast furnace is guaranteed; the lump ore and nut coke mixing ratio as well as other parameters are optimized, so that the high permeability index of the mixture can beachieved and the problem about a decrease in the coal gas efficiency of the blast furnace can be solved; and furthermore, the time for coal gas to stay in the blast furnace can be prolonged, the coalgas utilization efficiency of the blast furnace can be improved, the energy consumption of the blast furnace can be lowered, and the cost of raw materials being put into the blast furnace can be greatly reduced.

The invention discloses a method for measuring a permeability index of front coke or carbocoal of a COREX or a blast-furnace tuyere. The method comprises the following steps of: taking powder-containing slag-iron-free furnace burden at the blast-furnace tuyere as a total coke test sample; measuring a granule voidage E(total) of the total coke test sample; measuring a granule shape coefficient phi(total) of the total coke test sample; measuring granule specific surface average diameter de(total) of the total coke test sample; and obtaining a permeability index value of the total coke test sample according to a formula, FORMULA. By the method, the measurement of the furnace burden permeability index of the powder-containing furnace burden is realized; and the method can be widely applied tosmelting industries.

The invention discloses a determination method for the permeability of a paper-making reconstituted tobacco substrate coating liquid. The method includes the steps of: S01, cutting a smooth reconstituted tobacco substrate into round samples, performing folding and conducting opening from the middle to form cone, and putting the cone into a glass funnel; S02, using a pipette to suck 5-20ml of a coating liquid, transferring the coating liquid in the pipette all into the funnel, starting timing, letting the coating liquid gradually drip from the funnel into a conical flask, and taking out the conical flask 2-10min later; S03, mixing the solution in the conical flask uniformly, then detecting the turbidity, repeating the detection process and performing calculation to obtain the average turbidity T; S04, dripping a same volume of coating liquid directly into an equal amount of clear water, mixing the substances evenly, then performing detection to obtain turbidity T0, simultaneously detecting the clear water turbidity to obtain Tw; and S05, representing the permeability of the paper-making reconstituted tobacco substrate coating liquid as the permeability index X shown as the specification. The determination method for the permeability of a paper-making reconstituted tobacco substrate coating liquid provided by the invention has the advantages of simple operation and accurate measurement result.

The invention relates to a water pressure regulation method at seepage water outlet end, which comprises connecting a pipe filter with a sample seepage water outlet end, using a speed-regulating valve connected with the pipe filter to regulate the flux of the seepage water outlet end in 0-10L / min to keep stable seepage quantity at the water outlet end. When the water pressure at the seepage inlet end is stable and the sample seepage is balance with the regulation flux, the effusion end generates stable water pressure and forms stable water pressure difference at two ends of the sample. When the seepage water pressure difference and the flux are stable, the permeability test in the time section meets darcy law to obtain the sample permeability index at relative conditions. The invention has low cost, which resolves the high-pore water pressure and low hydraulic gradient simulation test of project to provide reliable water pressure regulation method at seepage water outlet end for sample permeability and mechanical property research.

The invention discloses a data-filtering-based method for judging the blast furnace hanging, which comprises the following steps of: carrying out filtering data in the actual operation of a blast furnace by using a grading processing method; according to the blast furnace technology, establishing a primary rule base module for monitoring changes and fluctuations of single parameters of the blast furnace; establishing a secondary rule base module for monitoring joint changes and fluctuations of multiple parameters of the blast furnace; according to data monitoring and evaluation results, timely warning or correcting the abnormal conditions of the blast furnace; flexibly adjusting a primary rule base and a second rule base as required. The data of the primary rule base include a gauge rod, the descent speed of the gauge rod, the ratio of a hot air pressure to an air volume after normalization calculation, permeability indexes, the ratio of an average edge temperature value of cross-shaped four temperature measuring points to the top temperature of the furnace, the ratio of the average edge temperature value of the cross-shaped four temperature measuring points to the throat temperature of the furnace and furnace heat indexes; the data of the secondary rule base include alarm data outputted by the primary rule base. According to the method disclosed by the invention, the problems that traditional rule bases are inconvenient to modify, difficult to maintain, complicated in structure, fuzzy in conclusion and the like are solved, and the conditions of the blast furnace hanging are subjected to targeted monitoring, thereby providing the basis for the production operation of the blast furnace and achieving the aims of reducing the fluctuation of furnace conditions, guaranteeing the stability and the smoothness of the furnace conditions, improving the production efficiency of the blast furnace and reducing the energy consumption.

The invention provides a tester for detecting permeability of textile exposed to rain in natural rainfall process simulation. The tester comprises a spraying device, a control panel, a cabinet, a water splash-proof cover, a sample fixing device and a water receiving box. The top in the cabinet is provided with the spraying device, a side of the top of the cabinet is provided with the control panel, the bottom of the cabinet is provided with the sample fixing device, the water receiving box is arranged below the sample fixing device, the water splash-proof cover is arranged outside the sample fixing device and the water receiving box, the control panel is respectively and electrically connected to the spraying device and the sample fixing device, and the spraying device, the sample fixing device and the water receiving box are arranged along the same line. The tester provides equipment support for detection of permeability of textile exposed to rain, provides two detection methods as choices, improves accuracy of detection of permeability of textile exposed to rain, realizes data detection of the permeability indexes of textile exposed to rain and provides basis for overall performance improvement of textile.

The invention discloses a method for fast detecting venting performance of filter tip of a cigarette made of high air permeability forming paper. The method comprises the following steps of: (1) determining closed suction resistance, circumference, length, hardness index processing parameters of the filter tip; (2) manufacturing test filter tip samples by using forming paper with different air permeability indexes; (3) testing opening suction resistance values of different filter samples; (4) making an alignment chart for the air permeability of the forming paper through the opening suction resistance obtained in step (2); (5) performing opening suction resistance testing on a to-be-tested filter tip, if the opening suction resistance value is close to a straight line, determining that the filter tip is normal in quality, if the opening suction resistance value is above the straight line, determining that the filter tip is bad in venting performance, and finding the reason from the aspects that whether the specification of the high air permeability forming paper is misused, and whether the glue in the filter tip is overflow; and if the opening suction resistance value is below the straight line, determining that the venting performance of the filter tip has a passed the design target, and finding the reason from the aspect that whether the specification of the high air permeability forming paper is misused.

The invention discloses a system and method for detecting the air permeability of a paper diaper. The system comprises a closed container, a control center and a urine injection device, wherein the urine injection device is used for injecting urine into the surface of a to-be-tested paper diaper; the paper diaper is upwards and horizontally spread in the closed container to divide the closed container into an upper cavity and a lower cavity which are not communicated with each other; a first constant temperature and humidity module, a first air circulating flow module and a first weighing module are arranged in the upper cavity, and a second constant temperature and humidity module, a second air circulating flow module and a second weighing module are arranged in the lower cavity; and the first constant temperature and humidity module, the second constant temperature and humidity module, the first air circulating flow module and the second air circulating flow module are connected with the control center. According to the system and the method, the quality of air volatilized from the front and rear surfaces of the paper diaper in the use process can be automatically detected, and then the air permeability indexes of the front and rear surfaces of the paper diaper can be measured, thereby guiding the research and development of the paper diaper.

A water-absorbent sheet composition containing a structure in which an absorbent layer containing a water-absorbent resin and an adhesive is sandwiched with two or more sheets of hydrophilic nonwoven fabrics, wherein the water-absorbent sheet composition has a structure in which the absorbent layer is separated in divided parts of a primary absorbent layer and a secondary absorbent layer with a water-permeable substrate having a water permeability index of from 20 to 90, and wherein the water-absorbent resin is contained in the absorbent layer in an amount of from 100 to 1000 g / m2. The water-absorbent sheet composition of the present invention exhibits some excellent effects that the water-absorbent sheet composition is capable of accomplishing thinning and avoidance of gel blocking phenomenon and liquid leakage, while obtaining basic properties as a water-absorbent sheet composition at a high level, even for a water-absorbent sheet composition containing a very small amount of pulps.

The invention discloses a riparian buffer zone water and soil conservation control method based on an optimal vegetation pattern. The method comprises the steps that firstly, setting vegetation distribution patterns of different scenes; comparing and analyzing the change of the permeability index LI under the vegetation distribution pattern of each scene in combination with the terrain condition of the riparian buffer zone site, so as to screen out an optimal vegetation pattern combination with the best blocking effect on runoff and sediment transport; and finally, based on the optimal vegetation pattern, performing simulation control on the vegetation distribution of the riparian buffer zone. According to the method, an improved permeability index LI is applied, on the basis of considering the possibility of water and sand transmission between landscape units, different vegetation distribution conditions are set through scene simulation by means of land utilization / coating and topographic space data, and an optimal vegetation pattern is screened out; and then the water and soil conservation function of the riparian buffer zone is controlled based on the optimal vegetation pattern.

The invention discloses a method and a system for improving the air permeability of an iron ore sintering mixture. The method comprises the following steps: preparing iron ore sintering raw materials, mixing the iron ore sintering raw materials, separating 10 to 50 weight percent of a material from the mixture for briquetting, and granulating other materials; and sintering the briquetted material and the granulated materials. The system comprises a burdening unit, a mixing unit, a granulation unit, a briquetting unit and a sintering unit, wherein an inlet of the mixing unit is connected with an outlet of the burdening unit; an outlet of the mixing unit is connected with an inlet of the granulation unit and an inlet of the briquetting unit; an outlet of the granulation unit and an outlet of the briquetting unit are respectively connected with an inlet of the sintering unit. According to the technical scheme provided by the invention, the average particle size of the sintering mixture can be effectively increased, and the air permeability index of the mixture is increased; and therefore, a sintering material layer can be heightened to 800 to 1,000 mm, and the production efficiency of sintering is effectively improved.

The invention relates to a medical packing material resisting impregnation, which comprises a surface layer and a bottom layer, wherein the surface layer is arranged above the bottom layer, contents are arranged between the surface layer and the bottom layer, the bottom layer comprises dialyzing paper and an impregnation resisting layer, the impregnation resisting layer is arranged on the outer side of the bottom layer, the dialyzing paper is arranged on the inner side of the bottom layer, and the dialyzing paper is directly contacted with the contents. In the medical packaging material resisting impregnation provided by the invention, the impregnation resisting layer is arranged at the bottom layer, so that liquids, such as blood, alcohol, distilled water and the like which are usually used in medical environments, can be prevented for impregnating, and sterilized medical instruments can be prevented from being contaminated. The impregnation resisting layer provided by the invention can ensure the air permeability of the bottom layer, and meets requirements on air permeability indexes in related standards.

The invention relates to a determination method of a material column liquid permeability index in a COREX smelter-gasifier. The determination method comprises the following steps: 1) sampling: taking tuyere test samples on a central plane of a tuyere of the COREX smelter-gasifier from the tuyere to different positions of the center of the COREX smelter-gasifier through a tuyere sampling device along the radial direction of the COREX smelter-gasifier; coding the obtained tuyere test samples; 2) screening the tuyere test samples to separate out carbon coke / semi-coke, furnace dreg and iron; combining the carbon coke / semi-coke to form a tuyere carbon coke test sample and combining the furnace dreg to form a tuyere furnace dreg test sample; 3) determining the voidage epsilon and the pressure difference P of the tuyere carbon coke test sample, and the temperature strength Q of the tuyere furnace dreg test sample respectively through corresponding tests; 4) calculating according to a formula to obtain the liquid permeability index L of the tuyere test samples at different positions (wherein the formula is shown as the description). The determination method provided by the invention is high in operability and is simple and feasible; the determined material column liquid permeability index can be used for effectively evaluating the activity of a hearth of the COREX smelter-gasifier.

The invention discloses a method for fast detecting venting performance of filter tip of a cigarette made of high air permeability forming paper. The method comprises the following steps of: (1) determining closed suction resistance, circumference, length, hardness index processing parameters of the filter tip; (2) manufacturing test filter tip samples by using forming paper with different air permeability indexes; (3) testing opening suction resistance values of different filter samples; (4) making an alignment chart for the air permeability of the forming paper through the opening suction resistance obtained in step (2); (5) performing opening suction resistance testing on a to-be-tested filter tip, if the opening suction resistance value is close to a straight line, determining that the filter tip is normal in quality, if the opening suction resistance value is above the straight line, determining that the filter tip is bad in venting performance, and finding the reason from the aspects that whether the specification of the high air permeability forming paper is misused, and whether the glue in the filter tip is overflow; and if the opening suction resistance value is below the straight line, determining that the venting performance of the filter tip has a passed the design target, and finding the reason from the aspect that whether the specification of the high air permeability forming paper is misused.

There is provided a high density woven fabric wherein air permeability under 50 kPa differential pressure is 2.5 L / cm2 / min. or less, and air permeability index (50 kPa) calculated by the formula 1 is 1.2 or more.Air permeability index (50 kPa)=(Log (Q (55 kPa))-Log (Q (45 kPa))) / (Log 55-Log 45) (Formula 1)Air permeability under Q(55 kPa): 55 kPa differential pressure is (1 / cm2 / min.); and Air permeability under Q(45 kPa): 45 kPa differential pressure is (1 / cm2 / min.).

The invention provides an object-oriented high-resolution remote sensing image impermeable layer extraction method. First of all, by use of an image segmentation technology, object segmentation of a remote sensing image is realized, a homogenous area is segmented into the same polygonal object, a normalization waterproof impermeability index and a normalization permeability index are extracted for the remote sensing image, an NDIPI graph and an NDPI graph are respectively obtained, by use of a permeability determination rule, permeability attribute interpretation of a segmentation object is realized, aggregation of impermeable objects is realized by use of an aggregation technology, and an impermeable layer of the remote sensing image is obtained. According to the invention, an impermeable area is rapidly extracted, the problems of too many terrain details, difficult terrain classification and the like of a high-resolution image are solved, and the extraction precision of the impermeable layer is greatly improved.

The invention discloses a method for judging a cohesive zone formation process in a blowing-in process of a blast furnace, and belongs to the field of blast furnace ironmaking. The method comprises the following contents: after air blowing is performed for 9-12 h, the CO2 content of stock gas is 12.0-15%; and after the air blowing is performed for 10-14 h, the thermal air pressure in a furnace is 204-242 kPa, and the differential pressure is 114-127 kPa. The method disclosed by the invention can guide the control on differential pressures and air permeability indexes in the cohesive zone formation process in the blowing-in process of the blast furnace, thereby providing production practice operation basis for the implementation of smooth air adding for blowing-in, promoting the smooth air adding for the blowing-in of large blast furnaces, and laying a good foundation for the rapid realization of target outputs and profits, so that better blowing-in technical and economical indexes are obtained.

Compositions for effectively delivering a water-soluble active material to a surface comprise: (a) from about 1% to about 30%, by weight of the composition, of a dialkyl quaternary ammonium compound having the formula: wherein R1 and R2 are independently C12 to C20 saturated alkyl chains; Y is wherein R4 is ethyl or isopropyl; R3 and R5 are independently methyl, ethyl, hydroxyethyl, or hydroxypropyl; m is 1, 2, or 3; n is 1 or 2; p is 0 or 1; and X− is a suitable anion; (b) from about 0.01% to about 10%, by weight of the composition, of water-soluble active material having a C log P of less than about 2.0; and (c) at least about 60%, by weight of the composition, of water; wherein the compositions contain vesicles having a vesicle permeability index of less than about 1.3. Processes to make the compositions comprise the steps of dispersing the dialkyl quaternary ammonium compound and the water-soluble active material in an aqueous solution to form vesicles having a vesicle permeability index of less than about 1.3.

The invention discloses a device for measuring permeability of a filter and belongs to the fields of water environment, traffic, chemistry and the like. The device comprises a galvanostat, a galvanostat connecting pipe, a pressure stabilizing tank, a pressure gauge, a valve, a sample container and a sample connecting pipe. The test process is completed on weighing equipment; before the test is started, the valve is closed, flowing water flow is introduced above the galvanostat until water flows out of an overflow port and the water flow is stable, and at the moment, the total weight of the device before the test is recorded; the valve is opened, the water flow starts to uniformly flow into the pressure stabilizing tank, and the reading of the pressure gauge and the test starting time are recorded; the test is ended when the liquid level of the pressure stabilizing tank rises to the lower edge of the glass tube, connected with the pressure stabilizing tank, of the galvanostat, and the total weight of the device and the test ending time are recorded; the air volume is calculated according to the weight difference, water and the air density under the corresponding pressure, and then the permeability index of the filter is calculated. The constant water flow device is adopted to replace a conventional air source method, so that the pressure is more constant and controllable; and the accuracy of measuring the permeability of the filter is improved.

The invention provides a method, device and equipment for determining the moisture content of an argillaceous sandstone reservoir. The method comprises the steps that the water saturation Sw, the reservoir permeability K and the reservoir porosity phi of the argillaceous sandstone reservoir are obtained; determining irreducible water saturation Swi and residual oil saturation Sor according to the reservoir permeability K and the reservoir porosity phi; determining the water relative permeability Krw according to the water saturation Sw and the irreducible water saturation Swi; according to the water saturation Sw, the irreducible water saturation Swi and the residual oil saturation Sor, the oil relative permeability Kro is determined; determining the moisture content Fw of the argillaceous sandstone reservoir according to the water relative permeability Krw and the oil relative permeability Kro; the water content Fw is used for representing the water content condition of the argillaceous sandstone reservoir. By means of the method, the moisture content of the argillaceous sandstone reservoirs with different pore permeability indexes can be determined, and the accuracy of determining the moisture content of the argillaceous sandstone reservoirs with different pore permeability indexes is improved.

Compositions for effectively delivering a water-soluble active material to a surface comprise:(a) from about 1% to about 30%, by weight of the composition, of a dialkyl quaternary ammonium compound having the formula:wherein R1 and R2 are independently C12 to C20 saturated alkyl chains; Y iswherein R4 is ethyl or isopropyl; R3 and R5 are independently methyl, ethyl, hydroxyethyl, or hydroxypropyl; m is 1, 2, or 3; n is 1 or 2; p is 0 or 1; and X− is a suitable anion;(b) from about 0.01% to about 10%, by weight of the composition, of water-soluble active material having a ClogP of less than about 2.0; and(c) at least about 60%, by weight of the composition, of water;wherein the compositions contain vesicles having a vesicle permeability index of less than about 1.3. Processes to make the compositions comprise the steps of dispersing the dialkyl quaternary ammonium compound and the water-soluble active material in an aqueous solution to form vesicles having a vesicle permeability index of less than about 1.3.

The invention discloses a system and method for detecting the air permeability of a paper diaper. The system comprises a closed container, a control center and a urine injection device, wherein the urine injection device is used for injecting urine into the surface of a to-be-tested paper diaper; the paper diaper is upwards and horizontally spread in the closed container to divide the closed container into an upper cavity and a lower cavity which are not communicated with each other; a first constant temperature and humidity module, a first air circulating flow module and a first weighing module are arranged in the upper cavity, and a second constant temperature and humidity module, a second air circulating flow module and a second weighing module are arranged in the lower cavity; and the first constant temperature and humidity module, the second constant temperature and humidity module, the first air circulating flow module and the second air circulating flow module are connected with the control center. According to the system and the method, the quality of air volatilized from the front and rear surfaces of the paper diaper in the use process can be automatically detected, and then the air permeability indexes of the front and rear surfaces of the paper diaper can be measured, thereby guiding the research and development of the paper diaper.

The invention discloses a method and a system for improving the air permeability of an iron ore sintering mixture. The method comprises the following steps: preparing iron ore sintering raw materials, mixing the iron ore sintering raw materials, separating 10 to 50 weight percent of a material from the mixture for briquetting, and granulating other materials; and sintering the briquetted material and the granulated materials. The system comprises a burdening unit, a mixing unit, a granulation unit, a briquetting unit and a sintering unit, wherein an inlet of the mixing unit is connected with an outlet of the burdening unit; an outlet of the mixing unit is connected with an inlet of the granulation unit and an inlet of the briquetting unit; an outlet of the granulation unit and an outlet of the briquetting unit are respectively connected with an inlet of the sintering unit. According to the technical scheme provided by the invention, the average particle size of the sintering mixture can be effectively increased, and the air permeability index of the mixture is increased; and therefore, a sintering material layer can be heightened to 800 to 1,000 mm, and the production efficiency of sintering is effectively improved.