The pendulum hardness tester evaluates the hardness of a paint film by measuring the decay time of a pendulum swinging on the surface of the film. A longer decay time indicates a harder and more fully cured film. It should be operated in a constant temperature and humidity environment, and repeated measurements should be taken according to standard procedures to obtain an average value. When interpreting the data, factors such as film thickness, substrate, temperature, and humidity must be considered. This method is suitable for most rigid coatings, but it may be inaccurate for surfaces that are too soft or rough, so it is recommended to combine it with other tests for a comprehensive evaluation. Regular calibration and maintenance ensure accurate and reliable measurements from the instrument.
2026-04-07
The mandrel bend test is a commonly used method for evaluating the flexibility of paint films. It simulates the deformation of coatings under stress by bending a test panel coated with the paint film over mandrels of varying diameters. During bending, the paint film undergoes both tensile and compressive forces, and if it cannot withstand the strain, it may crack or peel. The test starts with larger-diameter mandrels and progressively moves to smaller ones. The flexibility is assessed based on the smallest mandrel diameter that does not cause damage to the paint film. This method offers standardized operation and quantifiable results, making it widely applicable in the research, development, and quality control of products such as coatings and inks.
2026-04-07
The coulometric coating thickness gauge measures the thickness by calculating the electrical charge required to dissolve precious metal coatings through electrolytic dissolution. This method is non-destructive to the overall sample, only forming tiny electrolytic spots. During operation, it is necessary to clean the surface, select a compatible electrolyte, and control current and temperature to ensure accuracy. It is suitable for coatings such as gold and silver on conductive substrates, with a typical measurement range of 0.1 to 50 micrometers. Attention must be paid to calibration, compliance with standards, and technical limitations, such as its inapplicability to non-conductive substrates or excessively thick coatings.
2026-04-07
This article compares the principles of two types of coating thickness gauges. The magnetic induction method is primarily used for measuring non-magnetic coatings, such as paint or plastic, on magnetic metals like steel. The eddy current method, on the other hand, is applied to non-conductive coatings, such as anodized films, on non-magnetic metals like aluminum or copper. The key to selecting the appropriate method lies in the substrate material: magnetic induction is used for magnetic metals, while eddy current is employed for non-magnetic metals. In practical use, factors such as variations in the substrate's magnetic properties or electrical conductivity, as well as the curvature of the workpiece, can affect the results. Therefore, calibration with samples of the same material is necessary, and measurements should be taken on flat areas whenever possible.
2026-04-07
The electrolytic thickness gauge measures coating thickness through the principle of electrochemical dissolution, calculated based on Faraday's law, offering high accuracy and independence from calibration. In precision electroplating quality control, it accurately measures the thickness of single or multiple coating layers, with low requirements for surface flatness and stable data output. During use, it is necessary to select a suitable electrolyte and plan measurement points to evaluate uniformity. This method is destructive and is often complemented by other non-destructive techniques. Modern instruments feature a high degree of automation, comply with international standards such as ISO and ASTM, ensure result comparability, and play a crucial role in key quality monitoring in fields such as electronics and aerospace.
2026-04-07
This article primarily discusses how to determine the reference plane when measuring coating thickness on rough substrates. Due to the undulations of rough surfaces, the interface between the coating and the substrate is unclear, making it difficult for traditional methods to measure accurately. The article introduces two reference plane models: the profile midline model and the envelope line model, each suitable for different measurement requirements. It then lists several commonly used measurement methods, including microscopy, stylus profilometry, as well as eddy current and ultrasonic methods, and explains how each method determines the reference plane. Finally, the article emphasizes the need to consider factors such as substrate roughness during measurement, recommends clearly defining the reference plane, conducting multi-point measurements, and including roughness parameters in reports to ensure reliable results.
2026-04-07
This article explores the complex relationship between coating adhesion and thickness. Adhesion refers to the strength of the bond between the coating and the substrate, while thickness affects the functionality and cost of the coating. The two are not simply linearly related, primarily due to factors such as internal stress, the balance between interface and coating bulk properties, and curing uniformity. Typically, adhesion initially increases and then decreases with increasing thickness, with an optimal thickness range existing. Different coating systems exhibit varied behaviors; for instance, excessive thickness in anti-corrosion paint can easily lead to reduced adhesion, while electrodeposited coatings show relatively stable changes within the process window. In practical applications, these two parameters must be comprehensively evaluated to optimize coating design, processes, and quality control.
2026-04-07
The carton bursting strength tester is used to measure the maximum resistance of paperboard to rupture under uniform pressure, which is crucial for packaging quality control. Before operation, ensure the instrument is stable and properly calibrated, and that the test specimens are cut according to standard dimensions and conditioned under standard temperature and humidity conditions. During testing, the specimen should be clamped flat and securely, with an appropriate pressurization rate set, and the bursting pressure is automatically recorded. Ensure uniform clamping force, regularly inspect and replace the diaphragm, and keep the instrument clean. At least five tests should be conducted for each sample, and the average value should be taken. Regular maintenance and calibration of the instrument are necessary, and any abnormal results should be investigated for issues related to the specimen, instrument, or operation.
2026-04-03
This article introduces how to select a cardboard puncture strength tester. The tester is used to measure the cardboard's ability to resist impact penetration, and multiple aspects should be considered during selection. First, check whether the instrument complies with relevant testing standards, such as national or international standards. Next, choose an appropriate measurement range based on the strength range of the cardboard. There are two types of instruments: pointer-type and electronic-type, with the electronic type offering more functions and easier operation. Attention should also be paid to the instrument's accuracy, ease of calibration, operational safety, and whether data can be exported. When selecting a model, first clarify testing requirements, then compare parameters of different models, and finally consider the supplier's service and maintenance costs. Proper installation and regular calibration are also crucial for ensuring testing accuracy.
2026-04-03
This article introduces the principles, technical key points, and operational procedures for measuring the thickness of flexible packaging materials using an ultrasonic thickness gauge. It is based on the principle of ultrasonic pulse reflection, where thickness is calculated by measuring the propagation time of sound waves through the material. Flexible packaging materials are often thin and may consist of multiple layers, requiring attention to sound velocity calibration, probe coupling, and surface flatness during measurement. In practice, it is essential to standardize calibration, use coupling agents, and take multiple readings for averaging. This technology is applied in production quality control and product evaluation, with potential future improvements in accuracy and intelligence.
2026-04-03
This article introduces the principles and selection methods of film thickness measurement instruments. The measurement principles are mainly divided into contact and non-contact methods, which calculate thickness by detecting the differences in the film's response to physical signals. Optical transparent films typically use spectral reflection or ellipsometry, while opaque films often rely on mechanical profilometers or eddy current methods. When selecting an instrument, factors such as film material, thickness range, accuracy requirements, measurement speed, and sample condition must be considered, with industry-specific standards serving as references. The core principle is to match the appropriate technology based on actual needs to ensure accurate and reliable measurements.
2026-04-03
This article primarily discusses the application of colorimeters in color management for packaging and printing. A colorimeter is an instrument that measures color, converting it into numerical values, such as L*a*b* values. In packaging and printing, due to the diversity of materials and processes, color discrepancies can easily occur, and colorimeters are used to address this issue. They can measure colors at various stages of production, such as proofing, the printing process, and batch inspections, comparing them with standards. By evaluating the color difference ΔE value, they help determine whether the colors meet the required standards, enabling timely adjustments, reducing waste, and ensuring color consistency across different batches and suppliers. When using a colorimeter, it is important to calibrate the instrument, standardize measurement conditions, and set reasonable color tolerance standards. Overall, colorimeters make color management more objective and precise, helping to ensure the stability of packaging colors and maintain brand image.
2026-04-03
The film coefficient of friction tester is based on classical friction laws, calculating the static and kinetic friction coefficients by measuring the ratio of tangential force to normal force when two films slide relative to each other. During testing, samples must be prepared according to standards, with temperature and humidity controlled, and parameters such as load and speed set. Multiple measurements are taken, and the average value is used. The results are influenced by material surface characteristics, testing conditions, and operational consistency. This method is widely applied in industries such as packaging and printing and follows international standards such as ASTM and ISO.
2026-04-03
The vibration test bench simulates the vibration environment during transportation in the laboratory to test packaging and evaluate its protective performance. The tests are conducted mainly according to domestic and international standards, simulating sinusoidal or random vibrations to cover typical transportation conditions such as road and rail. By setting parameters such as frequency and amplitude, the test detects the condition of the packaging and its contents after vibration, helping to identify design flaws, optimize packaging solutions, and reduce the risk of transportation damage. This test is widely used in fields such as electronics and precision instruments, providing an important basis for the safety of product transportation.
2026-04-03
The packaging drop tester is used to evaluate the impact resistance of transport packages during vertical drops. Before operation, ensure the equipment is safe, calibrate the drop height, and prepare the specimens according to standards. During testing, first set the drop height, then secure the specimen and allow it to fall freely. After each drop, inspect the condition of the packaging and its contents, and record the data. Always prioritize safety during operation and avoid entering the drop area. After testing, assess the extent of packaging damage and the integrity of the contents based on standards.
2026-04-03
This article introduces the working principle and operation method of a packaging tear strength tester. It employs the Elmendorf tear method, where a pendulum falls to tear the sample, and the energy loss is measured to calculate the tear strength. The instrument mainly consists of a pendulum, clamps, a cutting device, and a measurement system. During operation, samples must be prepared according to standards, the instrument calibrated, parameters set, and the sample installed before testing, followed by data processing. The article also mentions that sample condition, operational consistency, and instrument maintenance can affect result accuracy, and lists relevant application areas and standards.
2026-04-03
The film peel strength tester is used to measure the force required to peel materials such as films from substrates, in order to evaluate their adhesion properties. Several key points should be considered during selection: first, the force range and accuracy should cover the estimated force values and comply with metrological standards; second, the testing speed must be stable and adjustable to meet the requirements of different standards; third, it should be equipped with a mechanism for precise angle setting and specialized fixtures to prevent damage; fourth, the equipment's stroke and testing space should accommodate the sample dimensions; fifth, the data system should support high-frequency data acquisition and automatically analyze key parameters. Additionally, the equipment must be compatible with industry testing standards, and factors such as ease of operation and long-term reliability should be taken into account.
2026-04-03
The carton compression testing machine is primarily used to test the load-bearing capacity of transport packaging under compression. It simulates the pressure experienced by cartons during stacking or transportation using upper and lower pressure plates, recording the relationship between pressure and deformation until the carton collapses or reaches a preset value. The test evaluates the maximum compressive strength, creep resistance, and fatigue resistance of the cartons, helping to identify weaknesses in packaging design. Operations must follow standards such as ASTM and ISO, with control over parameters such as speed, temperature, and humidity. Analysis of the results can guide the optimization of packaging materials and structures, reducing the risk of cargo damage during transportation.
2026-04-03
This article introduces the method for testing the tensile strength of packaging films using an electronic tensile testing machine. It first explains the importance of tensile strength for packaging films, then details the testing principles, equipment composition, and the need to prepare samples according to standards. Next, the article describes the testing process step by step, how to set key parameters, and how to analyze the obtained data, such as tensile strength and elongation at break. Finally, it highlights various factors to consider during testing and concludes that this method is reliable and very helpful for quality control.
2026-04-03
The negative pressure method sealing tester creates a pressure difference between the inside and outside of the packaging by vacuuming, to detect whether the food packaging leaks. If there is a leak in the packaging, water will enter the packaging or produce continuous bubbles under the pressure difference, thereby determining the sealing performance. The test requires controlling parameters such as vacuum degree and time, and referring to relevant standards. This method is intuitive, cost-effective, and suitable for sealing detection of various food packaging, making it an important step in ensuring food safety.
2026-04-03
