This article explores the alignment accuracy control issues when using a four-sided coater in conjunction with an automatic film applicator. Alignment accuracy directly affects the uniformity of the coating and the reliability of detection. The article analyzes three major factors influencing accuracy: the mechanical system, alignment reference, and operational process. Core control methods include mechanical designs such as tapered pin positioning and high-precision guide rails, combined with sensing feedback from contact probes or machine vision, and calibration compensation through software. Finally, accuracy is evaluated through repeated installation tests and actual coating validation. Future development directions involve more intelligent adaptive algorithms and IoT-based remote calibration.
2026-04-08
This article investigates the relationship between wire diameter and wet film thickness in wire-wound rod coaters. Theoretically, under ideal conditions, the wet film thickness is approximately half of the wire diameter. The study experimentally validates this relationship, finding that when key factors such as coating properties and coating speed are well controlled, the measured thickness aligns closely with the theoretical value. The research provides a benchmark for coating processes, though adjustments based on specific coatings and process conditions are still necessary in practical applications.
2026-04-08
This article analyzes the actual coating thickness deviation of stainless steel wire-wound rods under different slurry solid contents. The study found that the solid content of the slurry affects its viscosity and fluidity, leading to deviations between the actual coating thickness and the theoretical value. At low solid content, the thickness is close to the theoretical value, but as the solid content increases, the actual thickness significantly decreases. The article illustrates this pattern with experimental data and proposes methods to control thickness consistency, such as stabilizing slurry solid content and adjusting process parameters, to improve coating uniformity.
2026-04-08
The vacuum adsorption coating machine stabilizes flexible PET substrates on the coating platform through negative pressure, effectively addressing the issue of slippage during the coating process. Slippage is primarily caused by factors such as the smooth surface of PET, insufficient friction, and interference from coating pressure, which can lead to uneven coating. The key to the equipment lies in adjusting the vacuum pressure according to the substrate thickness, optimizing the adsorption area and platform design, and coordinating tension control and segmented adsorption to ensure uniform coating. In practical applications, attention must be paid to parameter matching and system maintenance to improve coating precision and product yield.
2026-04-08
This study investigates the effect of the platform temperature of a heated automatic film applicator on the surface drying time of waterborne polyurethane coatings. The experiments found that as the platform temperature increases, the surface drying time of the coating significantly decreases, showing a negative correlation between the two. Within the temperature range of 25°C to 50°C, for every 5°C increase in temperature, the drying speed accelerates, but the acceleration effect diminishes at higher temperatures. The study suggests that in practical applications, the appropriate temperature should be selected based on the characteristics of the coating to balance drying efficiency and coating quality.
2026-04-08
This article investigates the impact of the stroke accuracy of a desktop automatic film applicator on the repeatability of coating thickness. The experiment monitored the deviation of the blade position using high-precision sensors and measured the coating thickness. It was found that smaller stroke deviations led to better repeatability of coating thickness. Specific data showed that when the position deviation was controlled within 2 micrometers, the thickness fluctuation was minimal. The study concludes that maintaining good stroke accuracy in the film applicator is crucial for achieving stable coating thickness, and it is recommended that laboratories incorporate this into daily quality control practices.
2026-04-08
This article introduces the application of the integrated vacuum heating coating machine in the preparation of high-temperature curing coatings. The equipment reduces bubbles in the coating through a vacuum environment and integrates programmable heating and curing functions, enabling precise temperature control to promote chemical cross-linking of the coating and form a uniform film. It addresses issues such as residual bubbles and inaccurate temperature control in traditional methods, improving the repeatability and efficiency of sample preparation. However, the equipment is relatively costly and is primarily suitable for small-sized laboratory samples. Overall, it provides a more reliable solution for sample preparation in coating performance testing.
2026-04-08
This article introduces how the multi-speed function of a programmable automatic film applicator can be used to prepare gradient coatings. Traditional equipment struggles with real-time parameter adjustments, while this function allows for the pre-setting of multiple speed stages. By programmatically controlling the speed of the blade or substrate movement, the wet film thickness can be precisely adjusted to achieve gradient changes in coating properties. The article elaborates on its working principle, emphasizing that wet film thickness is roughly inversely proportional to the coating speed. Therefore, by programming a decreasing speed, a coating with increasing thickness can be obtained. In terms of program design, it is essential to reasonably plan the speed variation pattern and optimize it in conjunction with parameters such as blade gap and slurry viscosity. Application scenarios include optical thin films and battery electrode coatings, among others. During operation, attention should be paid to verifying the program, maintaining slurry uniformity, and considering the leveling process before curing. In summary, this function enhances the controllability and precision of coating preparation. In the future, it may be combined with online monitoring to achieve adaptive coating.
2026-04-08
The Short-Span Compression Tester (SCT) is used to measure the resistance of materials such as paper and paperboard to compression over a short distance, primarily following international standards such as ISO 9895. During testing, the instrument applies pressure to the sample over a fixed short span until failure occurs, and the SCT index is calculated based on the maximum compressive force and the sample dimensions, with the unit being kilonewtons per meter. This index helps evaluate the compressive performance of materials and is commonly used in the packaging and paper industries for quality control and product development. Testing must be conducted under standard temperature and humidity conditions, and attention should be paid to instrument calibration and standardized operation to ensure accurate and reliable results.
2026-04-07
The Taber stiffness tester is used to measure the bending stiffness of paperboard. Its principle involves applying a known moment to bend the sample and measuring its resistance to deformation. Bending stiffness is a key performance indicator of paperboard, affecting its processing suitability and packaging functionality. During testing, samples must be prepared according to standards, with measurements taken in both the longitudinal and transverse directions. The results are expressed as stiffness values and can be used for quality control and product development. This method complies with multiple international standards but is primarily suited for small-angle bending tests. It is recommended to combine it with other mechanical tests for a comprehensive performance evaluation.
2026-04-07
This article introduces how to use the IGT printability tester to evaluate the surface pick resistance of paper. The picking phenomenon refers to the situation where the adhesive force of the ink is too strong during printing, causing the surface fibers of the paper to be lifted, which affects print quality. The instrument simulates the actual printing process by gradually increasing the printing speed until picking occurs on the paper surface. The higher the critical speed at this point, the better the paper's pick resistance. The test must be conducted under standard conditions, controlling factors such as ink viscosity, pressure, and environment. The results can be used to guide paper production and optimize printing processes, helping to avoid printing failures.
2026-04-07
This article introduces the method of evaluating the interlayer bonding strength of paper using a Scott tester. The interlayer bonding strength affects the printing and mechanical properties of paper. During the test, the instrument vertically peels the paper through an adhesive test head, records the energy required for separation, and calculates the internal bond strength. The article details the test principles, standard procedures, and key parameters, and analyzes factors influencing the results, such as paper characteristics and test conditions. This method is widely used in quality inspection and research and development in the papermaking industry, helping to optimize processes and improve quality.
2026-04-07
This article introduces the application of the MIT folding endurance tester in high-frequency folding tests. High-frequency folding tests simulate the real-world usage of materials under rapid and repeated folding, imposing high demands on the instrument, which must possess high frequency, high precision, and stability. During the test, the material is rapidly bent back and forth under constant tension until it breaks, and the number of folds is recorded as the folding endurance. Key components of the instrument include the drive system, fixture design, and control system, which must ensure testing accuracy. This type of test is widely used in industries such as packaging, textiles, and electronics to help evaluate material durability and predict service life. When conducting the test, attention must be paid to sample preparation, instrument calibration, and parameter settings, following relevant standards to ensure reliable results.
2026-04-07
A cardboard burst strength tester is an inspection device used to measure the resistance of packaging materials such as cardboard to rupture under vertical pressure. During testing, the sample is clamped between annular clamps, and incremental pressure is applied via hydraulic or pneumatic means until rupture occurs. The maximum pressure value is recorded as the burst strength. This metric is key for evaluating the mechanical strength and durability of materials. The instrument is widely used in raw material acceptance, production process monitoring, and finished product inspection, helping to ensure packaging quality meets standards and predict its protective performance during transportation. Operation must follow standard procedures, and regular calibration and maintenance are required to ensure the accuracy of test results.
2026-04-07
The tensile strength testing machine is used to determine the tensile properties of paper by simulating the stretching process to obtain key parameters such as tensile strength and elongation at break. The tests comply with standards such as ISO and GB to ensure reliable results. Paper performance is influenced by factors such as fiber composition and humidity, requiring standardized operations. The data has significant applications in fields such as papermaking and packaging, providing a basis for quality control and process improvement. With technological advancements, testing accuracy and automation levels continue to improve.
2026-04-07
This article introduces how a paper whiteness meter measures CIE whiteness. Whiteness is a critical optical indicator for evaluating paper quality. Traditional methods rely on subjective judgment, while modern instruments provide objective data by simulating standard lighting conditions. CIE whiteness is an internationally recognized standard, calculated based on the reflectance of paper under specific light sources and taking into account human visual perception of white. The article also explains the measurement principles, commonly used formulas, instrument parameters, standard procedures, and practical significance, emphasizing the important role of this measurement method in paper production, trade, and quality control.
2026-04-07
This article introduces the principle and method of measuring paper gloss using a 75-degree mirror gloss meter. Gloss is the ratio of the light reflected from the paper surface to that reflected from a standard plate, with the 75-degree angle commonly used for measuring medium to high gloss papers. The article explains the instrument's structure and workflow, including calibration, sample placement, and reading steps. It also mentions that measurements are influenced by factors such as paper smoothness, color, and ambient temperature and humidity, emphasizing the importance of instrument maintenance and calibration. This method is widely applied in quality control and product development within the papermaking industry.
2026-04-07
This article introduces how the Sheffield smoothness tester analyzes the printing surface of paper. The instrument quantifies paper smoothness by measuring air leakage time, with longer times indicating a smoother surface. The article explains its critical role in print quality, as it can predict paper printability and help optimize printing parameters. Testing must be conducted under standard environmental conditions, with results expressed as smoothness values. Factors such as temperature, humidity, and calibration must be considered to ensure accuracy. This method is widely used in the papermaking and printing industries, adheres to international standards such as ISO, and provides a reliable basis for quality control.
2026-04-07
The Schopper air permeability tester measures paper air permeability based on Poiseuille's law, calculating permeability through air flow under constant pressure differential or pressure differential under fixed flow. The measurement follows ISO or GB standards, with key parameters including test area, pressure differential, temperature, and humidity. The instrument consists of components such as the test head, pressure regulation, and flow measurement, and features automated operation to reduce errors. Paper air permeability is critical for materials like cigarette paper and filter media, impacting product performance. During measurement, factors such as sample uniformity and environmental conditions must be controlled, and the instrument requires regular calibration. With technological advancements, the instrument is evolving toward higher precision and greater automation.
2026-04-07
The Cobb absorbency tester is used to measure the water absorption capacity of paper or paperboard by simulating the liquid contact process. It calculates the mass of water absorbed per unit area to determine the Cobb value. The test must be conducted under controlled conditions such as time, temperature, and pressure according to standard procedures, with results influenced by factors like the fiber structure of the paper and the degree of sizing. This instrument is primarily used for quality control in packaging, construction, and specialty paper industries. A lower Cobb value indicates better water resistance, while a higher value suggests stronger water absorption. Regular maintenance and calibration are required in daily use, and the technology is advancing toward automation.
2026-04-07
