Automotive film plays an important role in the Appearance and protection of modern vehicles. In order to ensure that the film can effectively resist external Impacts such as sand and gravel during driving, the stone impact test has become a key evaluation criterion. This article will introduce the principle, operation method and its importance in the evaluation of automotive film.
Introduction
As one of the indispensable means of transportation in our daily life, the appearance and protection of automobiles are crucial. Automotive film plays a key role in this regard, not only beautifying the appearance of the vehicle, but also protecting the body from environmental factors. In daily use, cars are often impacted by sand and gravel from the road surface under various road conditions. Therefore, film must have excellent stone impact resistance.
Stone impact test, also known as stone chisel test, is a test method specially used to evaluate the ability of automotive films to resist the high-speed impact of sand and gravel. It simulates various sand and gravel impact situations that a car may encounter while driving on the road, and aims to determine the film's tolerance under these conditions. This test not only examines the Impact performance, but also includes the comprehensive performance of various aspects such as friction and adhesion, thus providing important reference information for the mass and durability of the film.
Test principle
The principle of rock resistance testing is based on the following key elements:
Impact objects: The impact objects used in the test are usually small steel grit of specified shape and mass, generally between 4 and 5 mm in diameter. These small steel grit simulate the sand and gravel particles on the road and are the main tool for film Impact testing.
Impact speed: In the test, the small steel grit hits the film template at a certain speed. This speed is usually specified by the test standard to ensure conformity and comparability of the test.
Film template: The film template is the surface of the film to be tested, usually similar to the actual automotive film. The anti-stoning performance of the film template will be evaluated during the test.
Damage assessment: According to the number, size and depth of the speckle damage on the film template, the anti-stoning performance of the film is evaluated. Generally, the smaller and smaller the damage on the film, the better the anti-stoning performance of the film.
Test method
According to the ASTM D 3170-87 (1996) coating test method for stone strike resistance, the following are the specific operation steps:
It is necessary to prepare a stone impact test instrument, which is used for stone impact test. Ensure the normal operation and safe operation of the equipment.
Put steel grit with a diameter of 4 to 5 mm into the equipment. These grit will be used for Impact film prototypes during testing.
Compressed air is used to spray small steel grit and rush to the film sample to be tested at a certain speed and pressure. Typically, 500 grams of steel grit are used for each test, with two Impacts in 10 seconds.
After Impact, check for damage on the film template. Use tape paper to pull loose parts of the film off to better assess film damage.
The damage of the film is compared with the standard picture, and the anti-stone performance of the film is evaluated according to the number, size and depth of the damage on the film. Usually, the test results are expressed in a grade, with 0 being the best and 10 being the worst.
Importance and application
Stone strike resistance test has important application and importance in the evaluation of automotive film. Automotive film plays a key role in vehicle Appearance. Stone strike resistance test can ensure that the film will not be easily damaged during driving, thus maintaining the high mass and attractiveness of the automotive Appearance. Stone strike resistance test results can help automobile manufacturers to choose more durable film materials, thereby extending the service life of the film. This helps to reduce the maintenance cost of car owners and the Frequency of film replacement. For car buyers, knowing that automotive film has undergone rigorous stone strike resistance test can increase their confidence in the mass and durability of the vehicle and improve the motivation of car purchase. Stone strike resistance test also plays a key role in quality control and standard setting in automotive film manufacturing. Manufacturers can continuously improve film materials and production processes based on test results to meet industry standards and consumer needs.
Conclusion
The stoning resistance test of automotive film is a key evaluation criterion, which ensures the high mass of the car Appearance and the durability of the film. By simulating the sand and gravel Impact situation on the road, this test evaluates the anti-Impact, friction and adhesion performance of the film, providing consumers with a more secure car buying experience. At the same time, it also promotes the continuous improvement of film materials and production processes, helping car manufacturers to provide more competitive products. Therefore, the stoning resistance test plays an indispensable role in the automotive film industry, making an important contribution to car beautification and protection.
