Definition
Ink friction and decolorization testing machine is a special testing equipment used to evaluate the friction resistance of ink layers on the surface of printed products. It quantitatively measures the adhesion fastness and wear resistance of ink layers by simulating the friction that printed matter may be subjected to during transportation, handling, and use, providing key data for printing process optimization, material selection, and quality control. The test of this equipment complies with a number of common standards at home and abroad, and is one of the basic instruments in printing, packaging and related materials laboratories.
Principle
The core working principle of the equipment is to simulate and quantify linear reciprocating friction. The mechanism usually consists of a horizontally reciprocating friction head on which a standard friction medium such as white test cotton cloth or specific friction paper can be attached. The specimen is fixed flat on the sample stage, and the friction head repeatedly rubs the ink area on the surface of the specimen under a set pressure, speed and stroke. After the friction is completed, the friction resistance of the ink is evaluated by comparing the color or physical state changes of the friction area of the specimen with the non-friction area. The pressure it exerts can be calculated by the formula F = m * g, where F is the pressure, m is the mass of the loaded weight, and g is the acceleration due to gravity.
Measurement method
The standard measurement process typically follows: First, a printed specimen that meets the size requirements is prepared and securely fixed on the testing machine's sample platform. The specified friction medium is then mounted to the friction head and the specified load is applied to the friction head according to the standard requirements. Next, set the operating parameters of the equipment, including the number of frictions, the speed and stroke of the reciprocating movement. After starting the equipment, the friction head completes the friction of the specimen according to the set program. After the test, remove the specimen and friction medium. There are usually two ways to evaluate the final result: one is to use a gray scale card or colorimeter to quantitatively evaluate the degree of decolorization or color difference value in the friction area of the specimen; The second is to observe the ink traces transferred to the friction medium and judge the grade.
Influencing factors
The accuracy and repeatability of test results are influenced by a combination of factors. In terms of equipment parameters, the pressure applied by the friction head, the speed of reciprocating motion, the total number of frictions, and the stroke length are the core controllable variables that need to be strictly calibrated to ensure consistency. In terms of sample characteristics, the surface roughness and ink absorption of the substrate material, as well as the composition of the ink itself, the degree of drying and curing, and the thickness of the film layer will significantly affect its friction resistance. Environmental conditions such as temperature and relative humidity in the laboratory can also play a role in the physical properties of certain materials. In addition, the choice of friction medium, its own weaving method, fiber type and cleaning state are also variables that cannot be ignored.
Applications
This equipment is widely used in fields where objective evaluation of printed durability is required. In the packaging industry, it is used to test the ability of the outer packaging of food, daily chemical products and other commodities to resist abrasion during circulation. In print quality inspection, it is used to evaluate the ink adhesion fastness of book covers, posters, labels and other products. In the field of materials research and development, we assist in the development of new inks, coatings or substrates, optimizing formulations and processes by comparing test data. In addition, it provides a recognized and quantifiable means of evaluation in standardized testing and quality arbitration.
Selection considerations
When choosing the right ink friction decolorization tester, a comprehensive evaluation of many aspects is required. First, it should be confirmed whether the design and performance parameters of the equipment fully cover the requirements of the target detection standard, including the load range, speed control accuracy, counting accuracy and whether the stroke is adjustable. Secondly, examine the mechanical structure and material of the equipment, and a stable drivetrain and robust body help ensure the repeatability and long-term reliability of the test. The user-friendly design of the operation, such as the intuitive control interface and the convenient specimen holding device, can improve the efficiency of daily testing. Finally, consider the manufacturer's or supplier's technical support capabilities, including the sustainability of installation training, calibration services, and after-sales maintenance, to ensure that the equipment remains in accurate testing throughout its lifecycle.