Overview
HuiNuo QHZ film scratch tester is a special equipment used to evaluate the physical performance of film strength, Hardness and adhesion. It comprehensively characterizes the scratch resistance of coatings by measuring the minimum load required when the paint film sample coating is scratched by the scratch needle. The results directly affect the evaluation of important performance such as abrasion resistance and impact resistance of coatings. This instrument is a special equipment for implementing the national standard GB9279-88.
Features
1. Specially developed for the implementation of the GB9279-88 national standard, it is a necessary condition for the implementation of this standard.
2. Test method of scribing needle acting vertically on the film template, the table can be moved horizontally (motor/manual) and vertically (manual), and the operation is flexible.
3. Wide load (loading) range, covering 0-2000g, with a minimum increment of 50g, allowing accurate determination of the minimum Nominal Mass for cutting the paint film.
4. With the automatic switching function of experiment and return Travel, the scribe needle touches the sample in the experimental Travel, and the scribe needle automatically lifts in the return Travel to protect the sample and scribe needle.
5. Compact structure, light instrument weight (10Kg), easy to place and operate.
Principle
The instrument is mainly composed of a scribing frame and a workbench. During the test, the film sample is fixed on the experimental bench of the workbench. After the power is turned on, the workbench drives the sample to move, and the scribing needles on the scribing frame act vertically on the coating surface during the experimental Travel. By changing the Nominal Mass added to the scribing frame, it can be measured whether the paint film can be scratched under different loads. Finally, the minimum Nominal Mass required to scratch the paint film is used to quantify the anti-scratch performance value of the film.
Applications
Physical performance evaluation of coatings
Standards
GB/T9279-88、ISO1518-73
Steps
1. According to GB9271-88 standard, the preparation specification is 120 * 50mm film sample.
2. In an experimental environment with a temperature of 23 +/- 2 ° C and a relative humidity of 50 +/- 5% (refer to GB9278-88), fix the sample on the experimental bench of the workbench.
3. Turn on the 220V 50HZ power supply, and the red indicator light of the power switch is on at this time.
4. Make sure that the return switch is in the "experimental" state, the table will move from right to left, and the scribe needle will contact the template in Travel.
5. Apply weight to the scribing frame and test by changing different weights.
6. After the test is completed, dial the return switch back to the "return" state, and the workbench returns from left to right. At this time, the scribe is lifted without touching the sample.
7. Record the minimum Nominal Mass required to scratch the film to evaluate the film's scratch resistance.
Notice
• Test must be in accordance with standard GB9271 - 88 preparation specifications of the film sample.
• Humidity environment (temperature 23 +/- 2 ° C, relative humidity 50 +/- 5%) as specified in the standard.
• The lateral movement of the instrument table can be operated manually after the power is turned off, and the vertical movement is manual operation.
• The traverse speed of the scribing needle is a constant speed (20~ 40mm/s), and the instrument cannot adjust the speed.
• In "Return" Travel, the needle is lifted, and no scratch experiment is performed at this time, which can be used to change the template or adjust the position.
• Keep the instrument properly after use to ensure that the scribing needles and other components are clean and intact.
