MATERIALS TESTING & QC | MACHINERY


Measured approach: raising quality control


Developments in materials testing and quality control include a thickness measurement system, how viscometry improves foams, and an inline way to inspect polarisation film


Ensuring quality is fundamental to manufacturing – including all forms of plastics production. Everything from extruded film to printed packaging must be assessed for its appearance, performance and physical characteristics. One recent development comes from Isra


Vision, which has enhanced its optical inline inspection system for polarisation films. The company has equipped its Smash system with a new sensor that improves the detection of typical defects such as scratches and perforations. Thanks to a special extra lens, the polarisation angle of the camera can be automatically changed. Pre-configured, product-specific profiles can be transmitted online to the camera. There is no need to stop production to make adjustments – which further optimises inspection performance and product quality while saving time and cost. The system offers automatic surface inspection


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for optical films such as prism films, polariser films, protective films and window films. High-resolution line-scan cameras and lighting technology help it to recognise even the smallest defects – even at line speeds up to 150 m/min. The trainable defect classifier QuickTeach helps to simplify and accelerate system start-up. The system also includes a set of tools for data recording, analysis ad reporting functions. The polarising filter used for inline inspection allows automatic adjustment of the polarising angle in the event of phase changes in the film. It sets the polariser to full-light extinction or other predefined settings without the need to stop production. Because the camera always receives an optimum input signal, defects can be recognised even more efficiently and reliably, says Isra. This helps to optimise product output and raise quality. Product-specific settings can be pre-configured


Main image: Isra has


enhanced its Smash optical inline


inspection system for polarisation films


January/February 2025 | FILM & SHEET EXTRUSION 31


IMAGE: ISRA VISION


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