What Is GSM? How Quadrant Scales Are Significant In GSM Testing?

GSM stands for Grams per square metre is a crucial unit to measure the weight of the paper. It represents the weight of 1 square metre of paper in grams. In both the paper and packaging industries, the role of GSM is undeniable. A sample cutter is used to prepare the specimen, which is then tested on a GSM tester to find the basis weight.


The GSM of a paper depends on several things. The most common are:


  • The type of fibre

  • Fibrillation process

  • The length of the fibre

  • Fillers, pigments, as well as coatings on the paper. 

  • Calliper or thickness (the thicker the paper, the higher the GSM)

  • The process of drying and pressing the paper.

  • Moisture content in the paper

  • Consistency 

  • Calendering of the paper, 

  • The application for which the paper is made


When it comes to calculating the GSM of the paper, a quadrant scale does not play a direct role. In other words, one cannot measure the GSM directly on the quadrant scale. It is, in fact, measured on the GSM testing machine, by preparing an appropriate sample using a square paper cutter. 

The scale is, instead, used in applications of paper manufacturing and designing, where a specific weight of scaled drawings is required. In the following section, we will throw light on the usage of quadrant scale in the measurement of the weight. 


What Is The Role Of Quadrant Scales In GSM Measurement?


As mentioned above, the role of a quadrant scale begins comes, when manufacturers and designers are working on scaled drawings of paper or paper-based products. These products can be print layouts, packaging paper, etc. In the case of these products, it is crucial to find out the weight of the paper in proportion to its size or dimensions. For that purpose, manufacturers make use of scales. 


  • While designing paper products, such as packaging, brochures, flyers, posters, etc. a quadrant scale is used to scale their dimensions while measuring their final GSM. This helps designers ensure that the basis weight of the product is as per the set standards for costs, shipping, and handling.

  • When designers are designing a paper product in the scaled drawings and they are aware of the paper’s GSM, they can use a quadrant scale to measure the size of the product on the drawings. On this basis, they can calculate the weight of the actual product. All they have to do is multiply the scaled area by the obtained GSM. 


Where Can We Source The Best GSM Testers & Quadrant Scales From?

For accurate measurement of basis weight of paper and scaled drawings, it is important to have the right instruments. UEC is a leading manufacturer of these instruments and a lot of paper and paper product manufacturing companies rely on it for high-quality testers and scales. Even the most reliable and competent sample cutter and square paper cutter collection can be found here. To learn more about their products and send an inquiry, visit the official website of UEC today.

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