How does the rupture strength Tester check the quality of paper?

Paper is important in our daily life as it is used for printing, drawing, packaging etc. Paper mills use pulp to make this paper. The Bursting Strength Tester is used to test the strength of various paper and cardboard. It is a widely used measuring instrument. This is the minimum hydrostatic pressure required to rupture the paper or cardboard. Apply pressure using a rubber diaphragm. Paper properties depend on various factors such as chemistry, formation, basis weight and fiber type. It can be enhanced with long staples, wet and dry strength additives, sizing agents, etc. Fracture characteristics improve refining due to improved fiber bonding. At the same time, it is reduced by adding fillers, secondary fibers and dry stock. This test can refer to the Mullen test designed by Mullen. It is one of the oldest methods of testing paper strength.

 Various types of burst strength machines are available in the market such as burst strength Tester - analog, burst strength Tester - digital, burst strength Tester - digital and pneumatic and burst strength Tester - digital and pneumatic clamping computer model. The Tester consists of two grips, a lower grip and an upper grip. The upper clamp has a diameter of 95 mm with a circular opening of 31.5 mm in diameter. The lower clamp has a circular opening with a diameter of 31.5 mm. The upper jaw is attached to a pivot joint to create pressure to securely hold the paper.

step:

The paper sample is placed between the two grips by applying pressure on the sample.

Pressure is provided through a rubber membrane and hydraulic pressure until the sample ruptures.

Pressure is generated by an electric motor or a rotary pump.

Finally, record the test result, i.e. the pressure reading, expressed in kPa (kilo Pascals)

Bursting strength provides information about the quality of paper and packaging materials. The stress a material can withstand after applying pressure can be easily determined. Therefore, in the packaging industry, it is important to test the burst strength of paper and sheets.