how to measure the gauges for stretch film thickness
The methods for measuring the thickness of stretch film mainly include direct measurement and indirect measurement.
Direct measurement
Direct measurement methods include spiral micrometer, precision contour scanning (step method), scanning electron microscopy (SEM), etc. These methods directly induce the thickness of the film through contact or light contact, and are suitable for situations where the surface quality of the film is not required to be high.
Mechanical contact method is an early applied thin film thickness measurement method, which determines the thickness by measuring the mechanical displacement between the thin film and the probe. This method is simple and direct, but it may damage the surface of the film and affect the accuracy of the measurement. Common mechanical contact methods include spiral micrometers and micrometers, which are widely used in thin film processing and manufacturing industries.
Indirect measurement:
The methods of elliptical polarization, equal thickness interferometry, variable angle interferometry, capacitance, resistance, and weighing are examples of indirect measurement techniques. These techniques compute the film's thickness by applying particular matching physical relationships to pertinent physical parameters.
The optical method is a non-contact technique for measuring thin-film thickness that relies on the concepts of light interference, reflection, refraction, and so forth. It uses measurements of light intensity, phase, and polarization to determine a thin film's thickness. Because optical procedures are rapid, non-contact, and have high precision, they are frequently employed in fields like optical engineering and thin film research. Optical techniques commonly used are ellipsometry and interferometry.
Electron microscopy is a method of determining the thickness of a thin film by observing its cross-section using an electron microscope. It has the advantages of high resolution and strong intuitiveness, and can directly observe the microstructure and thickness of the film. However, electron microscopy requires complex equipment and technical support, and has high requirements for sample preparation.
In practical applications, choosing the appropriate measurement method depends on specific testing requirements and conditions. For example, for materials such as stretch films, it may be necessary to consider the influence of their plasticity and tensile properties on the measurement method to ensure the accuracy and reliability of the measurement.
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