Non woven fabric is a type of non-woven material that has characteristics such as lightness, breathability, softness, and durability. It is widely used in medical, health, construction, packaging, clothing, industry, and other fields. Especially in the medical and health fields, the quality of non-woven fabrics is directly related to the performance and safety of products, so accurate measurement and control of the weight of non-woven fabrics are crucial.
Definition and measurement significance of grammage
Weight, which refers to the mass per unit area, is an important indicator for measuring the quality of non-woven fabrics. The weight of non-woven fabric refers to the quality of non-woven fabric per square meter, which determines the thickness, softness, durability and other characteristics of non-woven fabric. Measuring and calibrating the weight of non-woven fabrics can ensure that the produced non-woven fabrics meet the specifications and improve product quality and competitiveness.
Current standards and equipment
At present, the widely used methods for weight detection of non-woven fabrics include oven method and electronic balance method.
Tactile comparison method
The tactile comparison method is a simple and rough measurement method that can be used to quickly determine the weight of non-woven fabrics. The specific operation method is as follows: 1. Place the non-woven fabric to be measured on one side and feel its weight by touching it with your hand; 2. Place the non-woven fabric with a known weight on the other side and feel its weight by touching it with your hand; 3. Compare the weight difference in the tactile sensation on both sides to determine the weight of the non-woven fabric to be measured. The advantage of the tactile comparison method is that it is easy to operate and does not require any measuring equipment, but the disadvantage is also obvious, that is, it cannot accurately measure the weight of non-woven fabrics and can only make rough estimates.
Liquid level method
The liquid level method is a simple and commonly used method for measuring weight. Firstly, a certain volume of solution needs to be prepared and allowed to come into contact with the non-woven fabric to be tested for a certain period of time. Then, lower the liquid level in the solution by a certain amount, calculate the buoyancy of the non-woven fabric based on the time required at different liquid levels, and finally use the formula for calculation. This method has low accuracy and is suitable for high weight non-woven fabrics.
Oven method
Place the non-woven fabric sample in an oven to dry, and then measure the quality difference before and after drying to calculate the moisture content of the sample, and then calculate the weight per square meter of non-woven fabric. The advantage of this method is that it is easy to operate and suitable for most non-woven fabric materials. However, it should be noted that the oven method is greatly affected by environmental temperature and humidity, and strict control of experimental conditions is required.
Electronic balance method
Use an electronic balance to measure the mass of non-woven fabric samples, and then calculate the weight in grams per square meter of non-woven fabric. The advantage of this method is its high accuracy and suitability for precise measurements. However, the electronic balance method has a high cost and requires regular calibration.
Experimental operation process
Taking the oven method as an example, the following is the general experimental procedure: 1. Select representative non-woven fabric samples and cut them into regular shapes, such as squares or circles. 2. Place the sample in an oven and dry it to a constant weight at the specified ambient temperature and humidity. 3. Take out the dried sample and measure its mass using an electronic balance. 4. Calculate the weight per square meter of non-woven fabric using a formula.
Error analysis
There are many factors that affect the accuracy of non-woven fabric weight measurement results, such as measurement temperature, humidity sensor accuracy, sample processing methods, etc. Among them, the accuracy of temperature and humidity sensors has a particularly significant impact on the measurement results. If the measurement of temperature and humidity is inaccurate, it will result in errors in the calculated weight value. In addition, the sample processing method can also affect the measurement results, such as uneven cutting or adsorption of moisture in the air, which can lead to inaccurate measurement results.
Practical application cases
Dongguan Liansheng Non woven Fabric Co., Ltd. adopts the oven method to measure the weight of non-woven fabric in order to ensure that the product quality meets relevant specifications and meets customer needs. During the production process, a portion of each batch of samples will be randomly selected for measurement, and the measurement results will be archived together with the production records. If the measurement results do not meet the specifications, immediately stop production for inspection and adjust the production process. Through this method, the enterprise successfully controlled the weight error of non-woven fabrics within ± 5%, ensuring the quality and stability of the products.
Develop unified standards
In order to standardize the measurement process and error range of non-woven fabric weight within the enterprise, the company has established the following white hair management regulations based on the above knowledge: 1. Regularly calibrate and maintain measuring equipment to ensure its accuracy and stability. 2. Strictly control the measurement environment to ensure that the temperature and humidity meet the measurement requirements. 3. Standardize the sample processing methods to avoid measurement errors caused by different processing methods. 4. Conduct data statistics and analysis on the measurement results, and promptly identify and solve problems in the production process. 5. Train and assess measurement personnel to improve their professional quality and skills.
Weighing calculation method
The weighing calculation method is a commonly used method for measuring the weight of non-woven fabrics. The specific method is as follows: 1. Weigh a non-woven fabric sample with a size of 40 * 40cm on a balance and record the weight; 2. Divide the weight by 40 * 40cm to obtain the gram weight value per square meter. The advantage of the weighing calculation method is that it is easy to operate and only requires a balance for weighing; The disadvantage is that a large sample is required to obtain accurate weight values. Overall, there are many methods for measuring the weight of non-woven fabrics, and each method has its own advantages and disadvantages. It is recommended to choose appropriate measurement methods based on specific situations in practical applications.
Dongguan Liansheng Non woven Technology Co., Ltd. was established in May 2020. It is a large-scale non-woven fabric production enterprise integrating research and development, production, and sales. It can produce various colors of PP spunbond non-woven fabrics with a width of less than 3.2 meters from 9 grams to 300 grams.
Post time: Aug-17-2024