News

Nordson What is the use of black high pressure hose? The black high-pressure hose structure is mainly composed of an inner rubber layer, a middle rubber layer, a four-layer or multi-layer alternately wound steel wire reinforcement layer and an outer rubber layer. The inner rubber layer has the effect of making the conveying medium withstand pressure and protecting the steel wire from erosion, the outer rubber layer protects the steel wire from damage, and the steel wire (Phi 0.3-2.0 reinforcement layer) layer is the skeleton material to enhance the effect. High pressure wire winding oil pipe (high pressure oil pipe) Use: High pressure steel wire reinforced hydraulic tubing is mainly used in mine hydraulic support, oil field development, Suitable for engineering construction, lifting and transportation, metallurgy and forging, mining equipment, ships, injection molding machinery, agricultural machinery, various machine tools and various industrial departments mechanized, automated hydraulic system transport with a certain pressure (high pressure) and temperature of petroleum (such as mineral oil, soluble oil, hydraulic oil, fuel oil, lubricating oil) and water-based liquids (such as emulsion, oil-water emulsion, water Such as and liquid transmission, high resistance to working pressure up to 70-120Mpa. Black high pressure hose application: High pressure steel wire reinforced hydraulic tubing is mainly used in mine hydraulic support, oil field development, Suitable for engineering construction, lifting and transportation, metallurgy and forging, mining equipment, ships, injection molding machinery, agricultural machinery, all kinds of machine tools and various industrial departments mechanized, automated hydraulic system transport with a certain pressure and temperature of petroleum-based (such as mineral oil, soluble oil, hydraulic oil, fuel oil, lubricating oil) and water-based liquids (such as emulsion, oil-water emulsion, water) and liquid transmission Move. Correct installation: To solve the oil leakage of the black high pressure hose, in addition to the quality of the black high pressure hose, it should be correctly assembled, and the pipe clamp should be installed in the correct position. Reasonable installation steps are: first used to screw on the two ends of the fastening nut on a few rings (do not tighten for the time being) and then tighten the fuel injector pressure plate bolt, determine the installation position of the fuel injector, gently tap the black high pressure hose with a wooden hammer, and then use a torque wrench to alternately tighten the fastening nut at both ends several times (torque is 40~6ON? m). If the injector assembly is not installed properly, and the center line inclination of the joint cavity and the horn head is too large, a large external stress will be generated after tightening the nut, resulting in damage to the black high-pressure hose joint. Reduce the resonance: the black high pressure hose has a large span, and the opening and closing of the injector needle valve when the diesel engine is working will cause the black high pressure hose to produce strong high-frequency vibration, which is one of the important reasons for the damage of the black high pressure hose. To this end, the middle of the black high pressure hose can be fixed on the adjacent bolts and other fixings to reduce resonance. Reasonable adjustment: the injection pressure of the injector meets the requirements of the instruction manual, and the stainless steel metal hose prevents the injection pressure from being too high and causing the black high pressure hose to break. When adjusting the oil supply advance Angle, do not force and push the black high pressure hose. Emergency treatment: If there is leakage in the black high-pressure rubber hose joint, you can use a soft metal sheet or plastic sheet cut into a small circle, pad in the joint cavity, and then press the horn head, you can also use a fuse, cotton thread along the tightening direction to wrap several laps at the shoulder, and then tighten the nut of the joint; If necessary, the nut seat can be coated with soap or on the pad chewed into a paste of bubble gum, maltose, etc. Develop custom knitted hose

In daily life, we can often see rubber tubes, its appearance has brought us great convenience, but how do we maintain it in daily life? What is the scope of its application? Below, our staff will give you a brief introduction to the relevant knowledge points. Cleaning: It is recommended that you empty the rubber hose after use. It should be cleaned if necessary. Inspection: The rubber tube must be inspected after each use to ensure that there is no structural damage. Pressure: If the rubber tube is under severe pressure during use or the outer layer of the rubber tube will be in contact with the transported liquid for a long time, a hydraulic test is recommended. Supporting electrical appliances, electronics, furniture equipment, toys, hardware, medical equipment, sporting goods, audio, lighting, machinery, cars, motorcycles, ships, aviation, harsh working environment of the wire jacket comb water, for many materials are non-stick, can play an isolating role in the field of industry. The relevant knowledge points about rubber tubes are introduced to you here first, I hope the above content can be helpful to you, if you don't understand where or want to consult you can contact our staff directly, we will serve you wholeheartedly. Develop custom knitted hose

Nordson Rubber & Plastics liweidong@nuoxincc.com First, product structure: steel rubber pipe structure is composed of liquid resistant synthetic rubber inner layer, middle rubber layer, Ⅰ or Ⅱ or Ⅲ layer steel rubber pipe reinforcement layer, and weather resistant performance of excellent synthetic rubber outer layer. Second, product use: Steel wire reinforced hydraulic rubber hose is mainly used in mine hydraulic support, oil field mining, Suitable for engineering construction, lifting and transportation, metallurgy and forging, mining equipment, ships, injection molding machinery, agricultural machinery, all kinds of machine tools and industrial mechanization, automatic hydraulic system with a certain pressure and temperature of petroleum-based (such as mineral oil, soluble oil, hydraulic oil, fuel oil, lubricating oil) liquid, water-based liquid (such as emulsion, oil-water emulsion, water), gas and liquid Body drive. Note: This standard is not suitable for castor oil-based and lipid-based liquids. Third, working temperature: oil -40℃ - +100℃, air -30℃ - +50 ℃, water emulsion +80℃ below, beyond the range, please choose our special products. Fourth, product features: 1. The hose is made of special synthetic rubber, which has excellent oil resistance, heat resistance and aging resistance. 2. The hose has high pressure and superior pulse performance. 3. The tube body is tightly combined, soft to use, and small deformation under pressure. 4. The hose has excellent bending resistance and fatigue resistance. 5. Steel braided rubber hose hose length is large, the longest can reach tens of meters or even more than 100 meters. Five, steel rubber hose hydraulic hose technical performance indicators: In the manufacture of reinforced rubber hose, vulcanization is an important process to produce a high bonding strength between the rubber and the reinforced layer, and make it a whole, and it is also an important link to ensure and improve product quality. In order to obtain good pulse performance and service performance of the wire reinforced rubber hose, in addition to reasonable structure and formulation, t must also ensure the density of the vulcanized hose. In order to meet this performance requirement, the traditional vulcanization method is to wrap water cloth on the hose semi-finished product before vulcanization to make it become a braided hose or steel wire reinforcement and vulcanization with steam vulcanization tank in batches. Low and medium pressure hose due to low performance requirements, rubber hose can also be directly placed in the vulcanization tank without tightening, although it can also increase the density of the hose, but its appearance is poor. In order to obtain smooth outer surface of the hose, the lead coated vulcanization method is widely used at home and abroad. For decades, people have been using this method as an effective way to vulcanize reinforced rubber hoses, especially high-pressure rubber hoses, and many manufacturers at home and abroad are still using this method to produce rubber hoses. But one of the fatal drawbacks of this method is that it pollutes the environment. Rubber hose is referred to as rubber hose. The main control of air compressor unit is more exhaust gas, according to the structure is divided into full hose, cloth hose, steel rubber hose and so on; According to different uses, it is divided into air hose, water absorption hose, water delivery hose, heat resistant hose, acid (alkali) hose, oil resistant hose and special hose, etc., and can be closed in the specified fan field. The main features of the company's products: reasonable structure design, stable and reliable quality, good dielectric resistance, heat resistance, aging resistance, resistance to flexure, high pressure, superior pulse performance; Products are widely used in coal mine, petroleum, engineering machinery, chemical industry, machine tool equipment, hydraulic, electric power, metallurgy, agricultural machinery and other fields, used to transport a certain pressure and temperature of petroleum-based liquid, water-based liquid, gas and other media, to achieve pressure transmission and medium transport. Hebei Jingxian Shengwei Rubber & Plastic Products Co., Ltd. is willing to sincerely and friendly cooperation with friends from all walks of life. All sales staff sincerely welcome new and old customers at home and abroad to inquire and negotiate, willing to provide you with comprehensive, high quality, efficient service, and can bear the long-term OEM production of major customers.

Nordson Rubber & Plastics liweidong@nuoxincc.com 1. It is very important to accurately use the steel ru bber hose to determine the length of the rubber hose you need, and it is also necessary to check whether the conditions of use of the rubber hose meet the requirements of the selected rubber hose. You should ensure that the rubber tube you will use is the most suitable. The working pressure and suction value should be carefully determined. In particular, it should be noted that changes in pressure or peak pressure exceeding the maximum allowed value will greatly shorten the life of the rubber tube. The ends of the rubber tube cannot be continuously immersed in the material being transported. 2. The rubber tube is ready for use. If you make the bending radius of the rubber tube less than the minimum value of the rule when installing the rubber tube, the service life of the rubber tube will be greatly shortened. Therefore, before the installation, it is recommended that you consult on the use of information, especially information about the bend radius of the rubber tube. 3. Protective cleaning of rubber hose: After use, it is recommended that you empty the rubber hose. It should be cleaned if necessary. View: The rubber tube must be viewed after each use to ensure that it does not show structural damage. Pressure: If the rubber tube is subjected to severe pressure when used, or the outer layer of the rubber tube will be touched with the liquid transported for a long time, a hydraulic test is advocated

liweidong@nuoxincc.com Rubber products are widely used in mining, metallurgy, automobiles, all kinds of machinery, etc., resistant tubing has irreplaceable primary effect. Since the founding of the People's Republic of China, especially since the reform and opening up, China's high-pressure hose and belt industry has developed. Now, China's high pressure hose can not only meet the needs of the domestic market, but also gradually enter the world market. 1. Production capacity ranks among the best in the world At present, there are nearly 1,000 high-pressure hose and belt factories in the country, more than 300 tape factories with a certain production scale, and more than 100 hose factories. High pressure hose, belt production capacity and output continue to increase, it is estimated that the primary high pressure hose, belt product production capacity ranked among the world's best, respectively, conveyor belt 150 million square meters, V-belt 700 million A meters, various hose 300 million standard meters. It can fully meet the needs of our national economy and has some exports. 2, high pressure hose, with raw materials abroad some domestic The raw materials used in high pressure hose and belt products in industrial developed countries mainly include natural rubber, general synthetic rubber such as styrene butadiene rubber, special synthetic rubber such as neoprene rubber, thermoplastic elastomer, synthetic resin, NN canvas, EP canvas, polyester cord, various rubber auxilaries, etc. Some of these raw materials are still blank in China 10 years ago, and now there are all of them. Its variety and quality are basically in line with domestic demand, and some products such as NN canvas, EP canvas, polyester cord and rubber additives are still exported. Very few raw materials that are not available in China are also readily available. Relatively rich raw material costs have laid the foundation for many exports of high pressure hose and belt products in China. 3, product structure with the world Since the reform and opening up, the high-pressure hose and belt industry have vigorously adjusted the product structure and achieved remarkable results. The proportion of chemical fiber belt, steel wire belt, PVC belt, PVG belt exceeds 90%, and the proportion of traditional cotton canvas belt is less than 10%, which is suitable for industrial developed countries; The proportion of V-belt in the V-belt structure exceeds 50%, close to the world's advanced level; The proportion of chemical fiber coiled pipe, braided pipe, knitted pipe, wire braided pipe, coiled pipe and resin hose exceeds 60%, which is also close to the world advanced level. Because the product structure is in line with the world, it is conducive to the export of high-pressure hose and belt products in China. 4, the level of skills and equipment close to the world's advanced level After the introduction and digestion and absorption of China's high pressure hose and skill equipment, its equipment production and the skill and equipment level of the primary company has been close to the world's advanced level, such as steel wire conveyor belt production line, coated V-belt production line, fiber coil hose production line, etc., its equipment performance and automatic control level are relatively high. Domestic industry is rapidly developing, together with the study and reference to foreign advanced equipment is also essential, resistant tubing products can fully meet the current world mechanical engineering and other aspects of high pressure hose demand, cost-effective overthrow fantasy!

The clauses in the inspection objectives of the ultra-high pressure hoses are formulated in relevant parts According to the rule requirements of the "High Pressure Water Jet Cleaning Safety Standard", the high pressure hose should reach the following target requests: 1) The explosion pressure should reach more than 2.5 times the working pressure. 2) The experimental pressure should reach 1.5 times the working pressure, and adhere to this pressure for more than 2 minutes without damage. 3) Pulse pressure should be in the range from zero to working pressure, 50,000 pressure pulses without damage; The pulse frequency is 15 times /min when the working pressure is 1000-2800bar, and 110 times /min when the working pressure is above 2800bar. Because high-pressure cleaning machines are now widely used in all walks of life, and the working conditions of high-pressure hoses are relatively the worst, it is necessary for us to pay attention to quality when purchasing high-pressure hoses, and then prevent unnecessary safety accidents. In the process of using the ultra-high pressure cleaning machine, there are many factors that affect the service life of the ultra-high pressure hose. In addition to the technical level of the hose in the manufacturing process, the quality function of the inner layer and the joint, the accurate selection and application of the ultra-high pressure hose and many other factors have a great impact on the service life of the ultra-high pressure hose.

A) Oxygen: oxygen in rubber with rubber molecules free base chain reaction, molecular chain fracture or excessive crosslinking, causing rubber properties change. Oxidation is one of the important reasons for rubber aging. B) Ozone: Ozone chemical reactive oxygen is much higher, more destructive, it is the same to break the molecular chain, but the effect of ozone on rubber varies with rubber deformation or not. When used as a rubber for deformation (mainly unsaturated rubber), cracks appear in the direction of direct stress action, that is, the so-called "ozone cracking"; When acting on the deformed rubber, only the surface of the oxide film is formed without cracking. C) Heat: Increasing the temperature can cause thermal cracking or thermal crosslinking of rubber. But the basic function of heat is activation. Increasing the oxygen diffusion rate and activation oxidation reaction, thereby accelerating the rubber oxidation reaction rate, which is a universal aging phenomenon - hot oxygen aging. D) Light: The shorter the light wave, the more energy. The damaging effect on rubber is the high energy ultraviolet light. In addition to directly causing the break and crosslinking of rubber molecular chains, ultraviolet rays can produce free groups due to the absorption of light energy, triggering and accelerating the oxidation chain reaction process. The external light acts as a heating agent. Another characteristic of the use of light (as opposed to heat) is that it is mainly produced on the surface of the rubber. The sample with high rubber content will have mesh cracks on both sides, that is, the so-called "outer layer crack rubber particles can be divided into black rubber particles and colored rubber particles, black rubber particles can be divided into 1-3mm black rubber particles, 1-2mm black rubber particles, 2-4mm black rubber particles according to specifications. Color rubber particles can be divided into green rubber particles, red rubber particles, blue rubber particles, white rubber particles, brown rubber particles, yellow rubber particles and other color rubber particles.

It is mainly used in the hydraulic system of aircraft fuel, mine hydraulic support, oilfield mining, construction machinery and equipment, which is used to transport high temperature and high pressure kerosene, oil, red oil (flammable and explosive media), and realize the pressure service transmission series products. Product structure: It is mainly composed of liquid resistant synthetic rubber inner layer, medium rubber layer, Ⅰ, Ⅱ, Ⅲ layer of wire braid layer, weather-resistant synthetic rubber outer layer, the inner rubber layer has the effect of making the conveying medium withstand pressure, protecting the steel wire from erosion, the outer rubber layer protects the steel wire from damage, the steel wire layer is the skeleton material, which plays an enhanced role. The structure of steel wire braided hose is composed of liquid resistant synthetic rubber inner layer, middle rubber layer, Ⅰ or Ⅱ or Ⅲ layer of steel wire braided reinforcement layer, and synthetic rubber outer layer with excellent weather resistance. Product use: High pressure steel wire reinforced hydraulic hose is mainly used in mine hydraulic support, oil field development, Suitable for engineering construction, lifting and transportation, metallurgy and forging, mining equipment, ships, injection molding machinery, agricultural machinery, all kinds of machine tools and various industrial departments mechanized, automated hydraulic system transport with a certain pressure and temperature of petroleum-based (such as mineral oil, soluble oil, hydraulic oil, fuel oil, lubricating oil) and water-based liquids (such as emulsion, oil-water emulsion, water) and liquid transmission Move.

First, the hose joint form can be roughly divided into internal thread form and external thread form 1) Internal thread form This structure is generally suitable for the occasion of low working pressure and large flow rate, this connection mode allows the diameter of the hose to be appropriately increased, and its sealing mainly depends on the sealing ring. 2) External thread form This structural form is mainly used in the case of high pressure, and most of the working pressure exceeds 1800bar. This connection method is to press the locking nut through the external thread connector, so that the conical sealing surface of the pipe section is closely fitted with the sealing surface of the connected piece, and plays a sealing role. The connected part can also be a jet attachment, such as a high pressure spray gun, a flat cleaning nozzle, a three-dimensional rotating nozzle, etc., or other high pressure hose. This connection method can effectively prevent the connection loosening under complex construction conditions. Second, the hose assembly uses cone sealing precautions 1) The connection adopts a cone Angle of 60 degrees, requiring that the cone Angle of the pipe end is generally less than 1 degree of the hole cone Angle; 2) The position of the pipe end must be kept sharp and must not be blunted; 3) The spiral direction between the pipe end and the locking nut should be opposite to the spiral direction of the external thread connector; 4) When processing connectors, the leakage hole should be retained at the sealing place to prevent high-pressure water leakage when the cone seal is not tight, which can play a safety warning role, but also facilitate observation and judgment, so as to better protect the sealing surface from being damaged.

1. It is very important to accurately use the rubber hose to determine the length of the rubber hose you need, and it is also necessary to check whether the application conditions of the rubber hose meet the requirements of the selected rubber hose. You should ensure that the rubber tube you will use is the most suitable. The working pressure and suction value should be carefully determined. In particular, it should be noted that the change of the testing standard pressure of the wear-resistant sandblast pipe or the peak pressure exceeding the promised maximum value will greatly shorten the life of the rubber pipe. The ends of the rubber tube cannot be continuously immersed in the material being transported. 2. Install rubber tube for use If you make the bending radius of the rubber tube less than the minimum value of the rule when installing the rubber tube, the service life of the rubber tube will be greatly shortened. Therefore, before the installation, it is recommended that you consult the use of information, especially the information of the bending radius of the rubber tube. 3. Protective cleaning of rubber hose: After use, it is recommended that you empty the rubber hose. It should be cleaned if necessary. View: The rubber tube must be viewed after each use to ensure that it does not show structural damage. Test standard pressure of wear-resistant sandblast pipe: If the rubber pipe is subjected to severe pressure during use or the outer layer of the rubber pipe will touch the liquid transported for a long time, it is advocated to carry out a hydraulic test.

Liquid specific gravity balance manufacturers analyze the external factors of liquid density measurement: 1. Temperature: when the temperature of organic compound liquid rises or falls, due to the relationship between thermal expansion and cold contraction, the volume of liquid will expand or shrink, and the density of liquid will also decrease or increase. 2. Pressure: when the pressure of organic compound liquid increases or decreases, the volume of liquid will also have a slight tendency to decrease or increase, but the range of change is much smaller than that caused by temperature change, so the change of liquid density caused by pressure is smaller than that caused by temperature. 3. The polarity: Liquid molecules are divided into polar molecules and non-polar molecules. There is only a very weak attraction between the molecules of a non-polar liquid, called the London dispersion force, but the attraction between the molecules of the poles, in addition to the dispersion force, there is also the interaction force between the * dipole or the * dipole and the inductive dipole, which keeps the molecules closer together. Therefore, in general, the liquid density of polar molecules is larger than that of non-polar molecules. The attraction between the molecules of polar liquids is strengthened by the presence of hydrogen bonds between the molecules, so the liquid density of such compounds is usually high. 4. Carbon chain length: For the same series of non-polar liquids and the liquid with a very small dipole torch, because the number of atoms in the molecule increases, the attraction between molecules becomes larger, and the liquid density also increases. For the polar liquid with large dipole torch, the increase of carbon chain reduces the density of the liquid. This is because the increase of carbon chain makes the dipole torch of the molecule smaller, and the attraction between molecules also decreases, so the density also decreases. 5. Whether the molecular shape is symmetric: The more symmetrical the molecular shape of a compound, the denser the liquid. This is the reason why the more symmetrical the molecules are, the closer the molecules are and the greater the attraction between them is. The internal factors affecting liquid density are closely related to the chemical structure of liquid molecules. Therefore, the chemical structure is a very important factor in the study of liquid density of organic compounds.

Because the pore structure of powder metallurgy has a great influence on the physical properties of powder, and powder metallurgy products according to its needs are bulk density, wet density, apparent porosity, oil content rate as the main identification criteria, so the density detection of forming body and sintered body is particularly important. According to the characteristics of powder metallurgy industry, the electronic powder metallurgy densitometer has been widely used in powder metallurgy industry. It only takes two steps to read the density value directly, which saves a lot of testing time. Compared with the labor cost, one investment can save time and labor cost for up to ten years. Powder metallurgy densitometer density analysis to three decimal places: 0.001, for the general powder metallurgy industry users, can meet most of the industry density test requirements, powder metallurgy densitometer can show the results are: density, volume, volume percentage, density maximum value, density minimum value, density average, etc.. Powder metallurgy densitometer manufacturers on powder metallurgy mixing process: The mixing process of P/M refers to the homogenization process of two or more powders of different composition. There are basically two methods of mixing: mechanical method and chemical method, the widely used is the mechanical method, the powder or mixture is mechanically mixed evenly without chemical reaction. Mechanical mixing can be divided into dry mixing and wet mixing. Dry mixing is widely used in the production of iron based products. Wet mixing is often used in the preparation of cemented carbide mixtures. Wet mixing often used liquid media for alcohol, gasoline, acetone, water, etc. Chemical mixing is a mixture of metal or compound powder and salt solution with added metal; Or the components are all mixed in the form of a salt solution, and then by precipitation, drying and reduction treatment to get a uniform distribution of the mixture. Often need to add additives, used to improve the strength of the billet or prevent powder component segregation of plasticizer (gasoline, rubber solution, paraffin, etc.), used to reduce the friction between particles and between the billet and the mold wall lubricant (hard zinc acid, molybdenum disulfide, etc.).

Liquid specific gravity balance manufacturers analyze the external factors of liquid density measurement: 1. Temperature: when the temperature of organic compound liquid rises or falls, due to the relationship between thermal expansion and cold contraction, the volume of liquid will expand or shrink, and the density of liquid will also decrease or increase. 2. Pressure: when the pressure of organic compound liquid increases or decreases, the volume of liquid will also have a slight tendency to decrease or increase, but the range of change is much smaller than that caused by temperature change, so the change of liquid density caused by pressure is smaller than that caused by temperature. 3. The polarity: Liquid molecules are divided into polar molecules and non-polar molecules. There is only a very weak attraction between the molecules of a non-polar liquid, called the London dispersion force, but the attraction between the molecules of the poles, in addition to the dispersion force, there is also the interaction force between the * dipole or the * dipole and the inductive dipole, which keeps the molecules closer together. Therefore, in general, the liquid density of polar molecules is larger than that of non-polar molecules. The attraction between the molecules of polar liquids is strengthened by the presence of hydrogen bonds between the molecules, so the liquid density of such compounds is usually high. 4. Carbon chain length: For the same series of non-polar liquids and the liquid with a very small dipole torch, because the number of atoms in the molecule increases, the attraction between molecules becomes larger, and the liquid density also increases. For the polar liquid with large dipole torch, the increase of carbon chain reduces the density of the liquid. This is because the increase of carbon chain makes the dipole torch of the molecule smaller, and the attraction between molecules also decreases, so the density also decreases. 5. Whether the molecular shape is symmetric: The more symmetrical the molecular shape of a compound, the denser the liquid. This is the reason why the more symmetrical the molecules are, the closer the molecules are and the greater the attraction between them is. The internal factors affecting liquid density are closely related to the chemical structure of liquid molecules. Therefore, the chemical structure is a very important factor in the study of liquid density of organic compounds.

Plastic particle density tester to measure the density of plastic particles, the most widely used in rubber, plastic and other industries, but in the measurement often encounter small bubbles on the surface of the sample, many people do not care about such a phenomenon, in fact, attached to the surface of the bubble on the sample density measurement results is quite large. Why emphasize the effect of air bubbles on the density of plastic particles? 1. Measuring the density of plastic particles, accumulated experience for a long time. 2. Because the measurement plastic is the product of the petrochemical industry, the surface of the particles are all with oil composition. Because of the surface tension of water, it is easy to attach bubbles. 3. Plastic particles in the process of mixing melting → production strip → cut into particles about 0.3cm×0.8cm, easy to make plastic particles exist pores, easy to attach bubbles. It causes poor reproducibility when testing plastic particles. 4. Air bubbles attached to plastic particles. According to the research report: · A bubble with a diameter of Φ0.5mm will cause a buoyancy of less than 0.0001g; · A bubble with a diameter of 1mm will generate a buoyancy force of 0.005g; · A bubble with diameter of 2mm will generate a buoyancy force of about 4.200g. How to reduce the bubbles attached to the surface of the sample when measuring with a plastic particle density tester? Need to understand the principle of bubble generation, as long as we need to measure the sample in the sink before dipping in absolute alcohol, dissolve its surface oil, can be very effective removal of surface bubbles