What factors can influence COF measurements?

What factors can influence COF measurements?

Packaging films are widely used in the packaging industry for their ability to protect products during transportation. However, these films must be properly tested before they can be used. One important test is the co-efficient of friction test, which ensures that the films will not slide when stacked on top of each other. This test is essential to ensure that products are properly protected and that customers receive accurate and undamaged items. Thus, we at Presto have come up with a co-efficient of friction tester that helps you to conduct COF tests for plastic films. This lab testing instrument accurately measures the coefficient of sliding friction so that the plastic films and sheets can easily be stacked over each other.

Whenever you are going to conduct a coefficient of friction test then we need to take care of some factors so that the results will not get influenced. The main purpose of conducting this test is to measure the stackability of plastic films. Here in this article, we are going to provide you with information about those factors that may influence the COF measurements. But before that, let’s have brief information on Presto friction tester and its role in the packaging industry.

Role of COF tester in the packaging industry

The coefficient of friction, or COF, is a value that represents the amount of force required to slide two surfaces against each other. The COF is a dimensionless quantity, which means that it is not affected by the size or shape of the surfaces in question. Instead, it only depends on the material composition of the surfaces and the amount of force applied.
The COF can be either positive or negative, depending on the direction of the force applied. If the force is applied in the opposite direction of motion, then the COF is negative and the surfaces will move apart. However, if the force is applied in the same direction as the motion, then the COF is positive and the surfaces will move together.
The coefficient of friction is an important parameter in packaging applications, as it can help to determine the amount of force required to move objects along a given surface. It is also frequently used in safety calculations, as a high COF can help to prevent slipping and sliding of plastic films. You can read about the COF tester's role in the packaging industry
This static and dynamic friction testing instrument has been designed in accordance with industry standards and performs accurate testing for determining the coefficient of friction value. This lab testing equipment has been equipped with several advanced features. Below we have listed the features and technical specifications of this lab testing equipment.

Features of Presto COF tester 

  • Clamps are provided to attach the sample to the glass slab.
  • Safety switches are provided at the end surface to stop the motion of the load cell along with the weight.
  • Gives both dynamic and static friction.
  • Speed regulating knob.
  • Digital display for both kinetic and dynamic friction.
  • Calibrated in accordance with ISO norms, Calibration Certificate provided traceable to (NABL).

Technical Specifications of Presto COF tester

  • Outer Body Construction: Mild Steel, Powder Coated
  • Sample Mounting Construction: Stainless steel with glass mounting
  • Load Cell Capacity: 5Kgf
  • Motor: Single phase ¼ H.P
  • Display for load: Dual Display- Digital and Computerized
  • Block: Weight, Dimension, Thickness- 200gm, 63.5 x 63.5 mm, As per Load
  • Speed: 150±30mm/min
  • Standards: ASTM D1894, ASTM D202, ASTM D4918, ISO 8295 and TAPPI T815
  • Power Supply: 220 V AC, 50 Hz, Single Phase Power Supply
  • Safety: Limit Switch
  • Weight of slide Clamp: 200g
  • Accuracy: 2.5%
  • Least Count: 1g
These are the features and technical specifications of this lab testing equipment. Whenever you are going to conduct a COF test, then you need to prepare the specimen accurately. Now, let us focus on the important aspects that you should remember so that COF testing measurements will not get influenced.

Factors that may influence your COF measurements

Whenever you are conducting a friction test using the Presto friction tester, there are several factors that may influence the results of your test. Below we have listed the top 3 factors.
  • Size of sleds: When you conduct a COF test for plastic films then you must choose the same size of sleds while comparing the results of the two materials. This is beneficial in providing accurate lab testing results.
  • The roughness of plates: The roughness of plate surfaces attached to the co-efficient of friction testing instrument can also influence the test results. Therefore, it is recommended to evaluate the roughness of plate surfaces before transferring the material to them.
  • Inappropriate sample: The testing sample should also be determined beforehand so that there are no wrinkles or dust present on it. This will help to provide you with accurate test results.
By taking all of these factors into consideration, you can ensure that your friction tests are conducted accurately and that your results are not influenced by any outside factors. If you need to know the co-efficient of friction tester price or want to conduct a FREE sample testing session, then you can give us a call at +91 9210903903 or email us at info@prestogroup.com. Our team of technical experts will help to provide you with the necessary information.


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