packaging testing equipment Water Vapor Permeation Tester
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  • how to calculate compression strength of corrugated box?
    how to calculate compression strength of corrugated box? 2020-09-25
        The compression strength of cartons is the most important quality index required by many commodity packaging. During the test, the corrugated carton is placed between two pressure plates and pressed to pressure when the carton is crushed. This is the compression strength of the carton, expressed in kn. compression strength of predetermined carton     Carton boxes require a certain degree of compression strength, because during storage and transportation after packaging, the cartons stacked in the bottom layer are under the pressure of the upper cartons. In order to avoid collapse, they must have the appropriate compression strength. Not only can the carton compressor be tested, the compression strength of the carton can be calculated by the following formula: P = KW (n-1)     Where p is the compression strength of the carton, w is the weight of the carton after packing, n is the number of stacking layers, and K is the stacking safety factor, and K is the stacking safety factor Calculate the stacking layer number n according to the stacking height h and the height of a single carton h, and N = H / h. The stacking safety factor is determined according to the number of stacking layers of the goods. According to national standards, for storage periods less than 30d, k = 1.6; for storage periods of 30d-100d, k = 1.65; for storage periods greater than 100D, K = 2.0.     Due to the influence of various factors in the production process, the final compression strength of the cartons produced with raw materials may not be completely consistent with the estimated results. Therefore, the ultimate accurate method to determine the compression strength of corrugated boxes is to test the compression strength of corrugated boxes with a carton compression tester     after constant temperature and humidity treatment. For small and medium-sized factories without testing equipment, a board can be covered on the carton, and then the same amount of weight can be stacked on the carton to roughly determine whether the compression strength of the carton meets the requirements     After the compression strength of the carton is determined according to the raw materials, the appropriate carton board and corrugated base paper should be selected to produce the corrugated carton, so as to avoid blind production and cause waste There are many formulas for calculating the compression strength of cartons based on the ring compression strength of the base paper, but the more concise and practical formula is the Kellicutt formula, which is suitable for estimating the compression strength of 0201 cartons.     Profession creates value, GBPI creates quality products! GBPI produces packaging compression testing machines, hot tack tester,heal seal strength tester, and other packaging testing instruments. Welcome to consult!
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  • How does a leak tester work
    How does a leak tester work 2020-08-14
    Packaging testing is essential to ensure the integrity of the packaging development, machine setup and quality control process. How to quickly choose a suitable air tightness testing equipment has become a major problem that plagues enterprises. Guangzhou GBPI company will introduce to you the testing methods of the mainstream air tightness detectors on the market. Companies can choose the right instrument according to their needs. 1. Positive pressure detection The positive pressure method is to seal and inflate the tested equipment so that its internal pressure is higher than the external atmospheric pressure. Three methods can be used: pressure drop method judgment, water immersion detection and fixed-point detection. Judgment by pressure drop method: In the case of completely sealing all contact surfaces, inflate the product, observe the pressure change through the air tightness tester to determine the magnitude of the leakage, and then infer the leakage of the equipment, but not the leakage point Make clear positioning. Water immersion detection (bubble method detection): Inflate a certain clean gas into the equipment, when the pressure reaches the set value, immerse it in water, and judge the location and size of the leak by observing the air bubbles. It is suitable for immersing in the interior Product detection in the water can accurately determine the location of the leak. Differential pressure detection method: The compressed air (positive pressure) is accurately input into the tested product and the standard product at the same time, the inflation circuit is cut off, and the IK-ALT series air tightness detector is used to calculate, compare and analyze to obtain the tested product The pressure difference ΔP between the product and the standard product is used to determine whether the product is qualified. 2. Vacuum leak detection (negative pressure method) detection The negative pressure method is to vacuum when the equipment is sealed to make the internal pressure less than the external atmospheric pressure. Specific applications include vacuum attenuation method (dry inspection) and vacuum side leakage method (water inspection) Vacuum attenuation method: Under the condition of completely sealing all contact surfaces, directly or indirectly vacuumize the product, and analyze and read the pressure value ΔP3 through the IK-MF series air tightness detector to determine whether the product is qualified . Vacuum side leakage method: differential pressure leak test method and bubble leak test method, the product to be tested is put into the leak test box, and the vacuum is drawn on the box body to cause a pressure difference between the inside and outside of the test product. At this time, the following phenomena will occur: a) For flexible packaging and soft bottles: I. If the packaging bag bulges and remains unchanged, the packaging is intact; II. The packaging bag does not bulge or shrinks, indicating that the packaging leaks; III. The p...
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  • How to measure the air permeability of textiles
    How to measure the air permeability of textiles 2020-07-28
        Air permeability is the ability of a fabric to allow moisture vapor to pass through. It plays a vital role in clothing and medical textiles.     Air permeability has nothing to do with air exchange. Rather, it is the ability of a fabric to allow moisture vapor to pass through.     Fabrics can achieve this in many different ways, and air exchange is only one possible way.     Compared with breathability, moisture vapor permeability (MVP) and moisture vapor transmission (MVT) may be better and more technical.     Neither ASTM nor the Textile Association defines air permeability, but both MVP and MVT are defined in the test standard.     According to EN 31092: 1993, water vapor permeability is "the characteristic of textile materials or composite materials, which depends on the water vapor resistance and temperature. Water vapor permeability is expressed in pascals per square meter hour.     According to BS 3546:2001, water vapor permeability is "the ability of a coated fabric to transmit water vapor to a specified level while maintaining high permeability".     According to the definition in the standard EN 31092: 1993, the water vapor permeability index is the ratio of thermal resistance to water vapor resistance.     According to BS 3546:2001, "The difference in water vapor pressure between the two surfaces of a material divided by the evaporation heat flux per unit area in the gradient direction" can be regarded as the "opposite" of water vapor resistance and air permeability.     Water vapor will transfer from the high concentration (pressure) area to the low concentration area by diffusion. Unobstructed, this can happen easily.     However, barriers like fabric will slow down the rate at which this happens. It is important to remember that steam pressure drives water vapor: humidity is not the key factor.     Modern waterproof and breathable fabrics can be divided into three different types, each of which works slightly differently. The breathability and waterproofness of the fabric is not entirely accurate, because the holes in the fabric structure are large enough to allow     water vapor to pass through, but too small to allow water droplets to pass through     The fabric air permeability tester is a professional and commonly used instrument for measuring air permeability.     GBPI can provide fabric air permeability tester and Water vapor transmission rate tester and oxygen transmission tester for a long time. Welcome to inquire.
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  • How is oxygen permeability measured?
    How is oxygen permeability measured? 2020-07-22
        The oxygen transmission rate test system is suitable for plastic films, high barrier materials, solar backplanes, sheets, composite materials, aluminized films, co-extruded films, aluminum foil, sheet materials and plastics, rubber, paper, and glass Oxygen transmission rate test for packaging containers such as bottles, bags, cans, boxes, etc., made of metal and other materials.     There are two methods for testing oxygen transmission rate: equal pressure method and differential pressure method:     In the isobaric test environment, the pre-processed sample is clamped between the test chambers, oxygen or air flows on one side of the film, high-purity nitrogen flows on the other side of the film, and oxygen molecules diffuse through the film to In the high-purity nitrogen on the other side, the flowing nitrogen is carried to the sensor. By analyzing the oxygen concentration measured by the sensor, parameters such as oxygen transmission rate can be calculated; for packaging containers, the high-purity nitrogen is The inside of the container flows, and the air or high purity oxygen surrounds the outside of the container.     In the differential pressure method environment, oxygen will move from the high pressure side to the low pressure side The oxygen flow rate is large, the transmission rate will increase     The GBPI oxygen transmission rate test can be easily installed by the user; the practical built-in operating program reduces operating errors, the prompt screen can remind the operator to input accurately, the safety protection system avoids the sensor damage and does not need to adjust the flow rate. GBPI is a manufacturer specializing in the production of oxygen permeability meters, gas permeability meters, moisture permeability meters, oxygen transmission rate testers, and other packaging testing instruments.
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  • What is the difference between the vapor transmission rate of different materials
    What is the difference between the vapor transmission rate of different materials 2020-07-17
        The water vapor transmission permeability of a polyethylene bottle refers to the amount of water vapor transmission through a sample within a certain time under a specified temperature, relative humidity, and a certain water vapor pressure difference.     The amount of water vapor transmission  permeability of a solid bottle at a specified temperature, relative humidity, and a certain water vapor pressure difference.     The water vapor transmission permeability  of the liquid bottle is within the specified temperature and relative humidity environment, and the percentage of water loss in the bottle within a certain period of time.     The water vapor permeability measurement methods are: cup method, electrolytic analysis method,Weight method.     The water vapor transmission rate of polyethylene bottles actually includes the two meanings of water vapor transmission  permeability and water vapor transmission coefficient. The meanings expressed by these two meanings also have certain differences, but they can be used to represent water vapor transmission. Ability to grow materials.     The water vapor transmission permeability indicates the weight of water vapor transmission material under a certain time, under certain temperature and humidity conditions. The water vapor transmission rate is the standard value of the water vapor transmission rate converted by the coefficient, and corresponds to the standard unit,     Used for comparison between different test results.     GBPI's star products are: precise laboratory instruments such as water vapor transmission rate tester, oxygen transmission rate tester, gas transmission rate tester, etc. More industry knowledge of transmission rate test instruments will be updated next time, more For more details, please pay attention to our official website.
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