Definition
Rubber alcohol friction testing machine is a specialized testing equipment used to evaluate the friction resistance of material surfaces. This device tests the abrasion and alcohol resistance of sample surfaces such as prints, coatings, and labels by simulating the friction process under the combined action of eraser and alcohol. The test results are important for product quality control in industries such as packaging, printing, electronics and automotive interiors.
Principle
The working principle of the device is based on the combination of reciprocating frictional motion with the action of a solvent. For testing, a specified size of rubber is mounted on the friction head and a specific load is applied. The friction head reciprocates the sample surface with a fixed stroke and frequency, while adding a specified concentration of alcohol solution to the friction area. The tolerability of the sample surface is evaluated by observing the changes in the number of frictions (e.g., fading, shedding, pilling, etc.) after the number of frictions reaches a predetermined value. The relationship between the number of friction and the degree of surface damage can be expressed as N = k × (F/v), where N is the effective number of friction, F is the load force, v is the friction velocity, and k is the material property coefficient.
Measurement method
The measurement process should be carried out in accordance with relevant standards (such as ASTM D5264, JIS K5701, etc.). First, the sample is fixed on the test platform. A standard eraser (usually a plastic eraser or a specific hardness rubber) is selected and installed on the lower end of the friction head and a standard weight load (typically 500g to 1000g) is applied. Set the friction stroke (e.g. 40mm) and frequency (e.g. 60 times per minute). Before testing, evenly infiltrate the rubber surface with a pipette with alcohol (usually 95% ethanol). After starting the device, the rubbing head begins to reciprocate, pausing after each completed number of reps (e.g., 50 times) to check the surface condition of the sample and refill with alcohol. Continue testing until a preset number of times is reached or the sample is significantly damaged, recording the number of friction times and the level of surface change at this time.
Influencing factors
Test results are influenced by a variety of factors. The material and hardness of the eraser determine its contact characteristics with the sample surface, and harder erasers may cause more significant wear. The concentration and amount of alcohol can affect how the solvent dissolves the coating or ink. The load size directly affects the frictional pressure, and increasing load usually accelerates surface damage. The friction velocity and frequency are related to the mechanical energy acting per unit time, and higher velocities may exacerbate the heat accumulation effect. Ambient temperature and humidity may also affect the volatilization rate of alcohol and the physical properties of the material. Inconsistent sample preparation and fixation may result in uneven stress in the friction area.
Application:
This equipment is widely used in the printing and packaging industry to detect the wear resistance of printed materials such as packaging boxes, labels, and manuals, ensuring that graphic information remains clear during transportation and handling. In the electronics industry, it is used to test the alcohol wiping resistance of surface coatings such as mobile phone cases and keyboard characters. In the automotive industry, it can be used to evaluate the durability of interior components such as dashboard logos and control panel coatings. In addition, it also plays a role in ink research and development, coating quality inspection, plastic product testing and other fields.
Selection
Testing requirements and standard compliance should be considered when selecting. First of all, the industry or national standards to be followed should be clarified to ensure that the equipment stroke, load range, counting accuracy and other parameters meet the standard regulations. Choose the appropriate table area according to the sample size. The equipment should have a stable reciprocating drive system and an accurate counting device. The alcohol delivery method (manual drip or automatic drip) can be selected according to test frequency and consistency requirements. The material of the equipment should be resistant to alcohol corrosion, and the structure should be designed for easy cleaning and maintenance. The user interface should be clear and intuitive, with functions for parameter setting, test process monitoring, and data logging. It is recommended to verify the suitability of the equipment through actual sample testing.