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Larey viscometer
The Larey viscometer is a commonly used instrument for measuring certain rheological properties (apparent viscosity, false yield value, shortness, etc
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LBN-II Larey Viscometer
1、 Overview of LBN-II Lare Viscometer:
The LBN-II Lare viscometer (also known as a drop bar viscometer) is a commonly used instrument for measuring certain rheological properties (apparent viscosity, false yield value, short degree, etc.) of non Newtonian fluids such as printing inks (fluids whose viscosity varies with shear rate). It is generally believed that the results of the Lare drop bar test can describe the partial rheological properties of ink during the printing process, which is suitable for the actual control of viscosity during ink production and often serves as a technical requirement for both the seller and buyer to accept. The LBN-II type drop bar viscometer is designed and manufactured in accordance with the international standard ISO12644:1996 (E) "Printing Technology - Determination of Rheological Properties of Slurry Ink and Its Connecting Materials Using a Drop Bar Viscometer". Its principle is to measure the required drop time of the drop bar under different loading loads through the pores coated with the test sample, and use appropriate flow models (Carson model, Bingham model or exponential law model) to obtain the apparent viscosity (viscosity value at a certain shear rate, sometimes also known as Larey viscosity obtained from the Larey drop bar test), yield value and short ratio (often referred to as short) of the sample by applying linear regression method.
2、 Main technical parameters of LBN-II Lare viscometer:
1. Power supply: 220V 50Hz
2. Applicable apparent viscosity range: 2-200Pa · s
3. Drop rod size: Φ 12 × 300mm
4. Falling weight: 132g
5. Weight group weight (total 4075g): 25-50-100-200-200-500-1000-1000g
6. Instrument dimensions (length x width x height): 140 x 140 x 300mm
7. Weight (including instrument, weight box, control box): 18kg
3、 Preparation for LBN-II Larey Viscometer Operation:
1. Remove the instrument from the box and place it on the workbench, then adjust the level of the instrument.
2. Plug in the signal connection cable plug and insert the temperature sensor into the slanted hole of the drop rod guide sleeve.
3. Connect the two latex tubes leading out of the thermostatic water bath (to be purchased separately) to the thermostatic water jacket.
4. Connect the power supply, turn on the power switch of the constant temperature water bath and instrument control box, the display screen shows the temperature in Celsius of the current guide sleeve, and the time is displayed as 0.00 seconds. (Note: The specific operation method of the thermostatic water bath can be found in the thermostatic water bath manual.)
5. The laboratory temperature should be maintained at 25 ℃± 2 ℃ throughout the entire measurement period. When the temperature of the guide sleeve reaches the standard requirement of 25 ℃± 0.2 ℃, the measurement can begin.
6. During operation, in order to minimize the temperature rise caused by human body temperature, bare hands should be avoided from touching the falling rod and guide sleeve of the viscometer. Wear gloves or place a small piece of cotton cloth in your hand when touching the falling rod or guide sleeve.
4、 Summary of LBN-II Lare Viscometer Operation:
1. Before the measurement, take about 5g of the tested sample each time, use a small ink knife to mix it evenly on the glass plate, and check that there are no coarse particles or impurities. The amount of the tested sample should be sufficient to cover the annular groove of the falling rod guide sleeve.
2. Insert the drop rod vertically into the drop rod guide hole and gently lower it onto the rotating baffle. Use a plastic ink mixing knife to apply the evenly mixed test sample onto the grooves of the drop rod and guide sleeve annular holes; Gently rotate the drop rod to evenly distribute the test sample around the groove; At the same time, you can use your fingertips to gently lift the dropper from the bottom of the dropper by about 20 millimeters, so that the test sample is as close to the bottom of the groove as possible. Release your fingers and let the dropper fall onto the rotating baffle to ensure that the groove is filled with the test sample.
3. Choose a load-bearing weight and place it at the top of the drop rod. Remove the rotating baffle to make the drop rod fall, allowing the tested sample to wet the drop rod and guide sleeve; Please also confirm that the photoelectric switch and temperature sensor are working properly (when falling, the temperature is displayed as the temperature at the beginning of the fall, and the time is displayed in seconds of the fall; when falling, the temperature is displayed as the temperature at the end of the fall, and the time is displayed as the actual number of seconds of the fall; when pulling the lifting rod, the temperature returns to the measured temperature of the guide sleeve, and the time is automatically reset).
4. Avoid any operation that may scratch the falling rod, and do not use a metal scraper to operate the falling rod; Do not perform falling operations without the tested sample. After falling, gently pull up the falling rod and place it on the rotating baffle. Use a plastic ink knife to scrape off the ink on the drop rod and apply it to the lower part of the drop rod and the circular groove of the guide sleeve.
5. Choose an appropriate combination of load weights: Follow steps 3-4 above to select weights for a drop test to confirm that the drop time of the selected maximum load weight is within the range of 4-10 seconds (recommended by American standard ASTM D4040-05 as close as possible to 1-2 seconds), and the drop time of the remaining weights does not exceed 60 seconds. Usually, 4-5 different weight combinations of load weights are selected.
6. The measurement of the tested sample starts from the heaviest weight in the weight combination, and this heaviest weight must be dropped at least twice with a time difference of no more than 0.5 seconds before the lighter weight can be replaced in sequence for measurement. Prepare the test sample according to steps 1-2 above before starting the measurement; After each drop, the ink on the drop rod must be scraped off with a plastic ink mixing knife and applied to the lower part of the drop rod; The tested sample shall not be added during the measurement; If it is found during the measurement process that the tested sample is not enough, clean the drop rod and guide sleeve, and then take a new tested sample and repeat steps 1-2 above. Each weight of the weight is measured three times, and the falling time of the rod (accurate to 0.01 seconds) and the temperature of the guide sleeve during the measurement (accurate to 0.1 ℃) are recorded each time.
7. The measurement operation should be rapid and uninterrupted, and all operations should be completed within 5 to 10 minutes. Many printing inks and binders contain highly volatile solvents, and unless the actual exposure time is strictly controlled, the volatilization loss during operation may cause significant deviation in the measurement results. If it is found that the falling rod of the same weight is dropped multiple times in a row, the falling time will be longer, indicating that there is significant volatile loss (at this time, it is advisable to choose a combination of heavier weights to reduce the measurement time).
8. Viscosity measurement is highly sensitive to temperature, so temperature must be controlled and monitored during the measurement process. In principle, if the temperature of the guide sleeve exceeds 25.2 ℃ before operation, the temperature control equipment must be reset; If the temperature change of the guide sleeve exceeds 25 ℃± 1 ℃ throughout the entire measurement process, the test must be redone.
9. After the measurement is completed, the instrument should be cleaned and maintained in a timely manner, especially the cleaning of the falling rod and guide sleeve, which must be done promptly, carefully, and thoroughly. Cleaning should use lint free cloth or paper and appropriate solvents.
5、 Precautions for using LBN-II Lare viscometer:
1. The drop rod, guide sleeve, photoelectric switch, and control box must be paired and used according to their numbers. Cross mixing between instruments is not allowed, otherwise the instrument constants α and β provided with the instrument will be invalid.
2. The falling rod and guide sleeve are precision parts, and their accuracy directly affects the measured data. Therefore, the tested sample must not contain high hardness impurities; The ink adjusting knife used for scraping ink must also be made of plastic or other soft materials to avoid scratching the stick.
3. The instrument constants α, β, and viscosity correction coefficient δ are measured by our company's testing personnel before leaving the factory and are provided on the accompanying CD.
4. During use, the drop rod and drop rod guide sleeve will inevitably experience wear, and the instrument constant and viscosity correction coefficient will also change accordingly. Therefore, the instrument should usually be evaluated and calibrated once a year.
5. The drop stick viscometer is used in the testing process of chemical raw materials. Before use, users should establish appropriate safety and hygiene protection measures in accordance with relevant safety regulations and determine rules and regulations. The safety issues related to contact with chemical raw materials should be established by the user and are not within the scope of this manual.
6. Our company will continuously improve and develop products based on market and customer needs. This manual is subject to change without prior notice.
1、 Overview of LBN-II Lare Viscometer:
The LBN-II Lare viscometer (also known as a drop bar viscometer) is a commonly used instrument for measuring certain rheological properties (apparent viscosity, false yield value, short degree, etc.) of non Newtonian fluids such as printing inks (fluids whose viscosity varies with shear rate). It is generally believed that the results of the Lare drop bar test can describe the partial rheological properties of ink during the printing process, which is suitable for the actual control of viscosity during ink production and often serves as a technical requirement for both the seller and buyer to accept. The LBN-II type drop bar viscometer is designed and manufactured in accordance with the international standard ISO12644:1996 (E) "Printing Technology - Determination of Rheological Properties of Slurry Ink and Its Connecting Materials Using a Drop Bar Viscometer". Its principle is to measure the required drop time of the drop bar under different loading loads through the pores coated with the test sample, and use appropriate flow models (Carson model, Bingham model or exponential law model) to obtain the apparent viscosity (viscosity value at a certain shear rate, sometimes also known as Larey viscosity obtained from the Larey drop bar test), yield value and short ratio (often referred to as short) of the sample by applying linear regression method.
2、 Main technical parameters of LBN-II Lare viscometer:
1. Power supply: 220V 50Hz
2. Applicable apparent viscosity range: 2-200Pa · s
3. Drop rod size: Φ 12 × 300mm
4. Falling weight: 132g
5. Weight group weight (total 4075g): 25-50-100-200-200-500-1000-1000g
6. Instrument dimensions (length x width x height): 140 x 140 x 300mm
7. Weight (including instrument, weight box, control box): 18kg
3、 Preparation for LBN-II Larey Viscometer Operation:
1. Remove the instrument from the box and place it on the workbench, then adjust the level of the instrument.
2. Plug in the signal connection cable plug and insert the temperature sensor into the slanted hole of the drop rod guide sleeve.
3. Connect the two latex tubes leading out of the thermostatic water bath (to be purchased separately) to the thermostatic water jacket.
4. Connect the power supply, turn on the power switch of the constant temperature water bath and instrument control box, the display screen shows the temperature in Celsius of the current guide sleeve, and the time is displayed as 0.00 seconds. (Note: The specific operation method of the thermostatic water bath can be found in the thermostatic water bath manual.)
5. The laboratory temperature should be maintained at 25 ℃± 2 ℃ throughout the entire measurement period. When the temperature of the guide sleeve reaches the standard requirement of 25 ℃± 0.2 ℃, the measurement can begin.
6. During operation, in order to minimize the temperature rise caused by human body temperature, bare hands should be avoided from touching the falling rod and guide sleeve of the viscometer. Wear gloves or place a small piece of cotton cloth in your hand when touching the falling rod or guide sleeve.
4、 Summary of LBN-II Lare Viscometer Operation:
1. Before the measurement, take about 5g of the tested sample each time, use a small ink knife to mix it evenly on the glass plate, and check that there are no coarse particles or impurities. The amount of the tested sample should be sufficient to cover the annular groove of the falling rod guide sleeve.
2. Insert the drop rod vertically into the drop rod guide hole and gently lower it onto the rotating baffle. Use a plastic ink mixing knife to apply the evenly mixed test sample onto the grooves of the drop rod and guide sleeve annular holes; Gently rotate the drop rod to evenly distribute the test sample around the groove; At the same time, you can use your fingertips to gently lift the dropper from the bottom of the dropper by about 20 millimeters, so that the test sample is as close to the bottom of the groove as possible. Release your fingers and let the dropper fall onto the rotating baffle to ensure that the groove is filled with the test sample.
3. Choose a load-bearing weight and place it at the top of the drop rod. Remove the rotating baffle to make the drop rod fall, allowing the tested sample to wet the drop rod and guide sleeve; Please also confirm that the photoelectric switch and temperature sensor are working properly (when falling, the temperature is displayed as the temperature at the beginning of the fall, and the time is displayed in seconds of the fall; when falling, the temperature is displayed as the temperature at the end of the fall, and the time is displayed as the actual number of seconds of the fall; when pulling the lifting rod, the temperature returns to the measured temperature of the guide sleeve, and the time is automatically reset).
4. Avoid any operation that may scratch the falling rod, and do not use a metal scraper to operate the falling rod; Do not perform falling operations without the tested sample. After falling, gently pull up the falling rod and place it on the rotating baffle. Use a plastic ink knife to scrape off the ink on the drop rod and apply it to the lower part of the drop rod and the circular groove of the guide sleeve.
5. Choose an appropriate combination of load weights: Follow steps 3-4 above to select weights for a drop test to confirm that the drop time of the selected maximum load weight is within the range of 4-10 seconds (recommended by American standard ASTM D4040-05 as close as possible to 1-2 seconds), and the drop time of the remaining weights does not exceed 60 seconds. Usually, 4-5 different weight combinations of load weights are selected.
6. The measurement of the tested sample starts from the heaviest weight in the weight combination, and this heaviest weight must be dropped at least twice with a time difference of no more than 0.5 seconds before the lighter weight can be replaced in sequence for measurement. Prepare the test sample according to steps 1-2 above before starting the measurement; After each drop, the ink on the drop rod must be scraped off with a plastic ink mixing knife and applied to the lower part of the drop rod; The tested sample shall not be added during the measurement; If it is found during the measurement process that the tested sample is not enough, clean the drop rod and guide sleeve, and then take a new tested sample and repeat steps 1-2 above. Each weight of the weight is measured three times, and the falling time of the rod (accurate to 0.01 seconds) and the temperature of the guide sleeve during the measurement (accurate to 0.1 ℃) are recorded each time.
7. The measurement operation should be rapid and uninterrupted, and all operations should be completed within 5 to 10 minutes. Many printing inks and binders contain highly volatile solvents, and unless the actual exposure time is strictly controlled, the volatilization loss during operation may cause significant deviation in the measurement results. If it is found that the falling rod of the same weight is dropped multiple times in a row, the falling time will be longer, indicating that there is significant volatile loss (at this time, it is advisable to choose a combination of heavier weights to reduce the measurement time).
8. Viscosity measurement is highly sensitive to temperature, so temperature must be controlled and monitored during the measurement process. In principle, if the temperature of the guide sleeve exceeds 25.2 ℃ before operation, the temperature control equipment must be reset; If the temperature change of the guide sleeve exceeds 25 ℃± 1 ℃ throughout the entire measurement process, the test must be redone.
9. After the measurement is completed, the instrument should be cleaned and maintained in a timely manner, especially the cleaning of the falling rod and guide sleeve, which must be done promptly, carefully, and thoroughly. Cleaning should use lint free cloth or paper and appropriate solvents.
5、 Precautions for using LBN-II Lare viscometer:
1. The drop rod, guide sleeve, photoelectric switch, and control box must be paired and used according to their numbers. Cross mixing between instruments is not allowed, otherwise the instrument constants α and β provided with the instrument will be invalid.
2. The falling rod and guide sleeve are precision parts, and their accuracy directly affects the measured data. Therefore, the tested sample must not contain high hardness impurities; The ink adjusting knife used for scraping ink must also be made of plastic or other soft materials to avoid scratching the stick.
3. The instrument constants α, β, and viscosity correction coefficient δ are measured by our company's testing personnel before leaving the factory and are provided on the accompanying CD.
4. During use, the drop rod and drop rod guide sleeve will inevitably experience wear, and the instrument constant and viscosity correction coefficient will also change accordingly. Therefore, the instrument should usually be evaluated and calibrated once a year.
5. The drop stick viscometer is used in the testing process of chemical raw materials. Before use, users should establish appropriate safety and hygiene protection measures in accordance with relevant safety regulations and determine rules and regulations. The safety issues related to contact with chemical raw materials should be established by the user and are not within the scope of this manual.
6. Our company will continuously improve and develop products based on market and customer needs. This manual is subject to change without prior notice.
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