In the coating/printing industry, the corona treatment is a commonly adopted step to enhance the surface energy of the coating/printing web, typically made of plastics, paper, fabrics with low surface energy of low 30s mN/m or dyne/cm.
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Major coating method and thickness control
The following are simple introduction of major coating methods and factors affecting coating process and coating thickness.
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As a rule of thumb, the wet thickness of a coating is estimated to be half of the gap between blade edge and substate surface in the blade coating or similar coating process.
Continue reading “Wet film thickness estimation in blade coating or similar process”Coating Defects Inspection Resolution
Surface defects inspection is an important step to in-line detect coating defects such as voids, streaks, clumps, bubbles, scratches etc. in continuous web coating and similar processes. It provides evidences for process optimization, root cause analysis, as well as quality control/assurance.
Continue reading “Coating Defects Inspection Resolution”Tumble test and drop test
Tumble test and drop test are critical to evaluate a product’s ability to survive the many bumps and scrapes it will experience in its life cycle with an end-user. Tumble test is more random while drop test can control drop orientation, impact point, etc.
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In semiconductors based devices, defects such as dislocations, grain boundaries, and impurities can function charge traps, which in turn play important roles in determining devices properties
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Dynamic shear is an important parameter to evaluate the cohesive strength of a PSA. It is commonly measured based on the ASTM D1002.
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Patent application, WO 2017/058499 Al, teaches a method to formulate OCA with good gap filling property for display applications.
Continue reading “OCA for good gap filling”EM shielding effectiveness measurements by MIL-DTL-83528
Electromagnetic shielding effectiveness of EMI materials is commonly measured based on MIL-DTL-83528 or ARP 1705.
Continue reading “EM shielding effectiveness measurements by MIL-DTL-83528”Names of coating/surface defects
The following pictures are useful in guiding the naming of coating or film defects. The content are from Wintriss website.
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