An adhesion tester, also known as an integrated bond strength test instrument is suitable for testing the bonding strength of various external wall-building materials, such as decorative tile adhesive, mosaics, various panels, paints, coatings, and other materials.
This pull off adhesion tester is an intelligent and high-precision bond (tensile) strength testing instrument developed by LANGRY according to pull-off adhesion test standards： ASTM D4541 and ASTM D7234 and market demand.
The main body of the tester is a portable hydraulic jack, and the pressurizing device and the hollow oil cylinder adopt an integrated structure design, which is convenient to carry and test.
The intelligent pressure gauge has functions such as automatic zero clearing, peak holding, quick storage, under-voltage reminder, over-range display, and intelligent calibration.
The adhesive testing equipment adopts a design of an integrated display instrument and instrument host, which does not require connection to the instrument and can be used directly after turning on the power, making on-site testing more convenient and efficient.
The adhesive tester’s oil pump adopts a screw drive and manual loading method. It adopts an innovative mechanical design and does not need to shake the screw out before the test. It has the characteristics of small driving torque, comfortable and reasonable shaking, continuous and uniform loading, and a stable body.
Because adhesion refers to the degree of firmness that the coating layer combined with the surface of the coated object through physical or chemical forces. The adhesion of the coating is the most important indicator for evaluating a coating or coating system. The coating is coated on the surface of the object to form a continuous coating that is firmly adhered to and has a certain strength. Coatings with good adhesion have decorative, protective, and other special functions, and are easy to maintain and update. Therefore, the determination of coating adhesion has received widespread attention in the coatings and painting industry.
First, prepare the test piece by cutting the decorative tile into isolated test pieces of the same size as the standard block using a tool. Then, use a strong adhesive to attach the standard block to the test piece. After the adhesive is completely cured and firm, connect the pull rod assembly and the standard block with a threaded connection, pass the pull rod through the hollow cylinder, and tighten the handle nut.
Turn the hand crank clockwise to push the plunger in the pump body to move, and the hydraulic oil passes through the built-in oil circuit to communicate with the pressure sensor, and the other path enters the hydraulic jack to push the piston to rise, driving the handle nut and pull rod to apply tension to the standard block.
As the hand crank rotates, the tension on the standard block gradually increases. When the decorative tile is peeled off, the oil pressure quickly drops to zero. Since the pressure sensor receives the same pressure as the pressure inside the hydraulic jack, a force-measuring device can be formed by the sensor and the digital circuit to display the corresponding pressure value.
At the moment when the decorative tile is peeled off, the circuit records the maximum oil pressure value and maintains the peak value display. The process of testing the strength of mosaic, various panels, paints, coatings, and various external wall-building materials is basically the same as the above principle.
After the test is completed, turn the hand crank counterclockwise to make the plunger in the pump body return to its original position, and the piston will also fall back to its original position. If the piston does not completely return to its original position, press the piston firmly to make it return.
There are currently two models of detection instruments, namely LR-P6 and LR-P10
Automotive manufacturing: used to test the adhesion of automotive coatings to ensure the quality and durability of the coatings.
Aerospace industry: used to test the adhesion of coatings on aircraft surfaces to ensure the durability and safety of the aircraft.
Construction industry: used to test the adhesion of coatings on building surfaces to ensure the quality and durability of the building surfaces.
Electronics industry: used to test the adhesion of coatings on electronic product surfaces to ensure the quality and durability of electronic products.
Medical device industry: used to test the adhesion of coatings on medical device surfaces to ensure the quality and safety of the medical devices.
Metal processing industry: used to test the adhesion of coatings on metal surfaces to ensure the quality and durability of metal products.
Paint and chemical industry: used to test the adhesion of coatings on the surfaces of paint and chemical products to ensure the quality and performance of the products.
In summary, adhesion testers have a wide range of applications in various industries to ensure the quality and performance of products.
Advantages:
Adhesion testers can quickly and accurately test the adhesion of coatings to ensure the quality and performance of products.
They can test various types of coatings, including paints, coatings, powder coatings, etc.
They can test various types of surfaces, including metal, plastic, ceramics, etc.
They can help users identify defects and problems in coatings so that repairs and improvements can be made in a timely manner.
Limitations:
The test results of adhesion testers are affected by various factors, including surface treatment, temperature, humidity, etc., so standardized testing is required.
The test results of adhesion testers can only reflect the adhesion between the coating and the substrate, and cannot reflect the quality and performance of the coating itself.
The test results of adhesion testers can only reflect the instantaneous adhesion, and cannot reflect the long-term durability and stability.
The testing of adhesion testers requires professional operation skills and experience, otherwise, it may affect the accuracy and reliability of the test results.
Factors affecting pull off tester
There are many factors that can affect adhesion. According to the theory of adhesion, the adhesion strength is generated by the combination of polar groups (such as carboxyl groups and hydroxyl groups) in the polymer of the coating and the polar groups on the surface of the substrate. Therefore, any factor that reduces this polar combination will lead to a decrease in the adhesion of the coating.
The cleanliness of the coating surface will affect the adhesion. For example, when there are oil stains, moisture, and other pollutants on the surface of the substrate, it will lead to a decrease in adhesion. Therefore, the sample surface should be kept clean and checked carefully before testing. Use appropriate solvents or clean soft cloth to wipe the surface of the sample clean.
The flatness of the coating surface. When using the tape method for adhesion testing, the coating surface should be flat and smooth, and the tape can adhere well to the coating surface. When peeling off, it can truly reflect the adhesion of the coating. Some special coatings are not flat, and the tape cannot be in close contact with the surface of the substrate. The results observed after peeling off cannot truly reflect the adhesion of the coating. Therefore, it is not recommended to use the tape method for adhesion testing.
The thickness of the coating. Adhesion testing of coatings must be carried out at the specified thickness. Even for coatings of the same type of product, different levels of adhesion testing results may be obtained due to different coating thicknesses.
The type of substrate and surface treatment are also important factors affecting adhesion. The same type of paint may have different adhesion on substrates with different surface treatments. If you want to obtain good adhesion, the coating process is very important.
The drying method and curing degree of the coating are also important factors affecting adhesion. For general coatings, natural drying under standard environmental conditions can achieve better curing degree and better adhesion of the coating.
Construction factors. During construction, the construction environment, coating process, and drying degree should be strictly controlled according to standards, and the construction should be carried out correctly to achieve good adhesion.
On the well-prepared surface of the substrate, appropriate testing methods should be used for adhesion testing, and the adhesion testing results should be evaluated correctly. This article has mentioned the precautions for the testing methods. Attention should be paid to every detail of the operation to correctly test and obtain accurate adhesion ratings.
1.The tester is strictly prohibited from being overloaded and can only be used up to 10kN; otherwise, it may cause permanent damage.
2.The hydraulic system should be kept clean, and after use, the handle should be turned counterclockwise to retract the piston.
3.The tester must be placed flat and stable, and subjected to vertical force during operation. It should not be operated beyond the stroke.
4.The hydraulic oil added should be clean and free of impurities.
The adhesion of coatings directly affects the protective ability of coatings on substrates. The adhesion index is particularly important for evaluating the quality of coatings. The results of adhesion testing methods are independent of each other and there is no conversion relationship between them, each with its own advantages and disadvantages. In addition to the selected coatings, the adhesion of coatings also depends greatly on surface treatment, construction, and coating maintenance. We should choose the appropriate method to determine the adhesion according to the actual situation, and continuously explore materials, processes, and methods to make the adhesion of coatings play a good role in application.
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