This article introduces the application of the Huinuo PTM1100/01 automatic spraying machine in automotive paint spraying experiments. Compared with manual spraying, the machine can fix parameters such as the spray path, speed, paint output, and air pressure, thereby improving spraying uniformity and repeatability. The thickness deviation of the samples can be controlled within ±2 micrometers. The article provides a detailed explanation of the equipment parameters (e.g., spraying area, nozzle diameter, air pressure range, etc.) and the methods for debugging key parameters (e.g., spray head height, moving speed, air pressure, and baseplate heating). It also includes examples such as clearcoat spraying, multi-layer waterborne primer spraying, and formulation screening, along with operational precautions and a summary.

2026-05-29

This article introduces how a tensile testing machine is used to evaluate the mechanical properties of metal jewelry chains. It first explains the importance of testing and then elaborates on key indicators such as maximum force, specified elongation force, and fracture analysis. Next, the article discusses how to select appropriate equipment, including aspects like accuracy, sensors, drive systems, and software. It also introduces specialized fixtures for finished chains, semi-finished products, and accessories. Finally, the article provides testing methods and common issues, such as the tendency of soft gold chains to slip and how to address this problem.

2026-05-29

This section introduces key technical points for applying liquid adhesive on a PI film substrate using a blade coating machine: during equipment calibration, the blade gap must be precisely controlled within ±2 micrometers; the adhesive should be selected with a surface tension below 35 mN/m and moderate thixotropy; the coating speed needs to be adjusted based on adhesive viscosity and thickness, with low speeds suitable for high-viscosity adhesives; the ambient temperature should be controlled at 23±2°C with humidity between 40% and 60%; common defects such as streaks, bubbles, and particle contamination must be addressed through steps including cleaning the blade, degassing, and dust removal.

2026-05-26

This article introduces a method for applying gel coatings onto nonwoven fabrics using an adjustable blade coater. Through precise gap control, it achieves uniform coating, addressing the instability issues of traditional manual coating methods. The article covers equipment principles, material matching, parameter adjustments (such as speed, gap, and angle), process case studies, and performance evaluation. In practice, attention must be paid to cleaning the blade, controlling tension, and managing environmental humidity. Overall, this method improves coating accuracy and repeatability, and may evolve toward automation in the future.

2026-05-26

This article introduces the method of applying liquid silicone to fabrics using a laboratory coating machine. Key points include equipment selection (such as blade coating and slot-die coating, suitable for different silicone viscosities), process parameters (relationship between coating speed, doctor blade gap, and thickness), fabric pretreatment (using plasma or primer to improve adhesion), as well as solutions to common issues (bubbling, uneven thickness). Finally, it mentions testing to verify adhesion and washability, emphasizing the importance of recording data through multiple trials to establish patterns.

2026-05-25

This article introduces the application of an adjustable preparator in coating specialized functional filtration membranes. Its core lies in adjusting the coating gap through a mechanical structure, precisely controlling film thickness and reducing human error. Compared to fixed-gap equipment, it allows real-time parameter adjustments when handling high-viscosity or volatile coating solutions, improving film thickness uniformity. Experiments show that the adjustable preparator can reduce thickness variation from ±3 micrometers to ±0.8 micrometers, enhancing flux consistency. The article also discusses the impact of parameters such as gap, speed, temperature, and humidity, as well as the advantages of this equipment in multi-layer coating and asymmetric membrane preparation, while reminding users to pay attention to coating liquid properties and maintenance.

2026-05-25

This article introduces the method for measuring the viscosity of liquid silicone using a rotational viscometer. Liquid silicone is a non-Newtonian fluid, and its viscosity varies with shear rate. During measurement, the temperature must be controlled at 23 ± 0.5°C, with an appropriate rotor and speed combination, ensuring the sample is free of bubbles. The standard procedure includes calibrating the instrument, allowing the sample to settle, measuring from low to high speed, and taking the average of three measurements. A common misconception is assuming viscosity has a single value; in reality, both shear rate and temperature must be specified. Additionally, issues such as insufficient instrument range, sample contamination, or evaporation should be avoided. Cases show that silicone exhibits shear-thinning and thixotropic behavior, with viscosity decreasing over time. It is recommended to record the viscosity-time curve and clean the rotor.

2026-05-25

This article introduces the methods and considerations for measuring coating thickness on cement substrates using an ultrasonic coating thickness gauge. Cement substrates are rough and porous, unlike metal, making traditional electromagnetic or eddy current thickness gauges unsuitable. Ultrasonic methods, due to their high tolerance for material variability, have become a solution. The article explains the principle of ultrasonic thickness measurement and highlights practical issues such as surface cleaning, couplant selection, and sound velocity calibration. It also discusses factors affecting accuracy, such as temperature, moisture content, and the curing stage of the coating, and illustrates common issues and solutions through case studies. In summary, measuring coatings on cement substrates requires experience and attention to detail and cannot rely entirely on automated operation.

2026-05-25

This article introduces two coating hardness testing methods: the pencil hardness tester and the pendulum hardness tester. The pencil hardness tester uses pencils of varying hardness to scratch the coating under a fixed pressure, measuring its scratch resistance. It is suitable for on-site rapid testing of coatings such as furniture paint and automotive paint. The pendulum hardness tester, on the other hand, evaluates the coating's damping characteristics and degree of curing by measuring the oscillation duration of a pendulum on the coating surface, offering higher sensitivity and suiting laboratory applications for formula optimization and curing process monitoring. There is no direct conversion relationship between the two methods; the choice depends on the purpose: use the pencil method for quick spot checks and the pendulum method for in-depth study.

2026-05-21

This article introduces the applicable scenarios of three commonly used measurement angles for gloss meters: the 60° angle is suitable for medium-gloss materials (10-70 GU) and serves as the universal choice; the 20° angle is used for high-gloss materials (above 70 GU), such as automotive paint surfaces; the 85° angle targets low-gloss materials (below 10 GU), like matte coatings. It also mentions specialized scenarios for 45° and 75° angles. In practice, measurements can be taken first at the 60° angle, and adjustments can be made based on the results.

2026-05-21

In the preparation of perovskite solar cells, spin coating and blade coating are two commonly used film deposition methods, each with its own applicable scenarios. Spin coating is simple to operate and produces uniform films, making it suitable for small-scale fundamental research, but it leads to significant material waste and is difficult to scale up. Blade coating offers high material utilization and good scalability, making it suitable for large-area fabrication and industrial production, although its process is sensitive and optimization is challenging. The choice between the two methods depends on the experimental goal: spin coating is preferred for new material screening or pursuing high-efficiency devices, while blade coating is better for large-area or commercialization assessments.

2026-05-20

This article mainly differentiates between high and low temperature test chambers and constant temperature and humidity test chambers. High and low temperature test chambers only control temperature and do not regulate humidity, while constant temperature and humidity test chambers can control both temperature and humidity simultaneously. When selecting a model, decisions can be made based on testing standards: if the standard only involves temperature, choose the former; if it involves "damp heat," the latter is required.

2026-05-20

This article introduces how to select an appropriate rotational viscometer from seven aspects: screening based on sample characteristics (such as homogeneity, volume, and volatility); selecting the model according to the viscosity range; temperature control methods; strategies for combining rotors and rotational speeds; the use of viscosity standard fluids; differences in selection between R&D and quality control scenarios; and maintenance considerations. The goal is to ensure reliable and comparable measurement data.

2026-05-18

This article introduces the Taber abrasion test method, which is used to evaluate the ability of coatings to resist mechanical wear, such as coatings on floors, furniture, or automotive interiors. The test involves rotating abrasive wheels to create friction on the specimen, simulating wear in real-world usage. It details the principles, required instruments (such as the Taber abraser and balance), environmental conditions, and operating procedure—from cleaning the specimen, weighing it, and installing it, to periodically monitoring wear. Results are calculated based on weight loss or film thickness reduction, emphasizing that the abrasive wheels need regular resurfacing and that the test should be performed three times to take the average for accuracy.

2026-05-18

This paper mainly introduces the aging test method for film materials in an ozone environment. The principle is to accelerate the oxidation of films using ozone to evaluate their durability. It lists domestic and international standards such as ISO, ASTM, and GB/T, and specifies that the test equipment must precisely control ozone concentration, temperature, and humidity. Samples need to be cut to specified dimensions and pre-treated. The test steps include applying tension, exposing to ozone, and observing cracks. Evaluation indicators include the time of crack appearance, crack density, and retention rate of mechanical properties. It also analyzes influencing factors such as concentration and temperature, as well as solutions to common issues.

2026-05-18

This article introduces three methods for selecting laboratory coating machines: wire bar coating is suitable for low-viscosity coatings, offering low cost and simple operation; blade coating is ideal for medium to high viscosity slurries or those containing particles, with a wide range of film thickness control; slot-die coating provides the highest precision and is suitable for high-end applications such as electronic films. The article also offers selection recommendations based on dimensions such as film thickness uniformity, coating characteristics, and substrate type, and suggests using standard samples for comparative testing to aid in the selection process.

2026-05-18

This article introduces a standard method for measuring the optical haze of transparent coated films using a haze meter. First, the instrument must be calibrated according to the standard, and the samples need to be conditioned in a constant temperature and humidity environment. The measurement involves four steps, including air zeroing, measuring total transmittance and scattered luminous flux, and finally calculating the haze value. The article also mentions key influencing factors such as thickness and surface roughness, and specifies the format for reporting results.

2026-05-15

This article discusses the impact of different substrate fixation methods on coating uniformity in vacuum-assisted blade coating testers. It compares four methods—vacuum adsorption, electrostatic adsorption, mechanical clamping, and adhesive fixation—focusing on their mechanical principles and limitations. Experimental data show that vacuum adsorption with optimized pore layout yields the lowest thickness variation coefficient, approximately 3.1%, while mechanical clamping exhibits greater variation due to central deformation issues. The article recommends prioritizing vacuum adsorption when substrate flatness is high, and emphasizes the importance of regular platform calibration.

2026-05-15

This article compares the coating precision of blade coaters and slot-die coaters in the laboratory. Blade coaters are suitable for thick coatings, offering simple operation but larger uniformity errors; slot-die coaters provide higher precision and better uniformity for thin coatings. The choice of equipment depends on coating thickness and accuracy requirements.

2026-05-15

This article analyzes the characteristics of laboratory blade coating machines used for forming films from high-viscosity slurries. It focuses on the impact of slurry rheological properties, such as shear-thinning behavior, on film quality; introduces key process parameters including blade gap, coating speed, temperature, and blade material; lists common defects such as streaking, bubbles, and orange peel, along with control methods; and explains the calculation methods for wet and dry film thickness. It references multiple domestic and international standards and technical literature.

2026-05-15