GSM is one of the most important methods to determine the weight of knitting fabric, paper cardboard or non-woven fabric. GSM is measured in Grams per square meter. There are many fabric varieties which are not commonly tested using GSM method for example, woven fabric, laminated fabric, and fabric with a coating. Therefore, it is important for customers to give their unique specifications prior to GSM testing.
In layman’s terms, GSM gives weight per unit area or the weight per unit length or weight per running yard. Before you perform the standard GSM test, you should use GSM cutter and acquire fabric samples. The GSM round cutter is a tool which gives precisely cut samples of 100 square centimeters.
What is a GSM cutter?
It’s a sleek and rounded metal device with a knob in the centre. There are blades mounted at the bottom which cut fabric which is to be placed on the testing scale. Generally, there are 110 fabric disks which are cut as samples for weighing. There is an electronic balance which is used to determine the weights of every sample. Then the total weight is calculated for the official GSM number.
After calculating the total weight of fabric, the manufacturers and inspectors check for any flaw and adhere to the standards. There are many other miscellaneous factors which are important to consider that can hamper the accuracy of the readings during the GSM test. When there is moisture or atmospheric humidity, the GSM of cotton fabric samples can be badly affected by the added water weight. Therefore, it is necessary to test all fabric samples under stable and controlled atmospheric conditions. Apart from this, you should check the working and reliability of the scale before performing testing.
However, it is very likely for human error to happen, therefore, the 5% occurrence is allowed whenever it comes to fulfilling the client’s requirements.