Polyimide (PI) film has been broadly used in industries due to its high mechanical strength, thermal stability, low coefficient of expansion (CTE), etc.
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Two major methods for non-woven fabrics manufacturing
Non-woven fabric has broad applications in important industrial markets such as hygiene, medical and filtration. There are two major technologies in the manufacturing of non-woven fabrics: Spunbonded and melt-blown.
Continue reading “Two major methods for non-woven fabrics manufacturing”Photo elasticity based stress analysis
Mechanic deformation can lead to the optical property change in an optical media, which is called photo elasticity. Therefore, this principle is commonly adopted to investigate the stress distribution in a material.
Continue reading “Photo elasticity based stress analysis”Water proof breathable membrane
US 3,953,566 teaches a method to make a water proof breathable membrane based expandable, amorphous locked Poly tetrafluoroethylene (ePTFE).
Continue reading “Water proof breathable membrane”Formation of Bénard cells
There is a drying pattern called “Bernard cell”, which is particularly easy to present in solvent borne solution drying.
Continue reading “Formation of Bénard cells”Polymer foams
Polymers foams are widely used in a variety of applications, e.g. heat/water/air insulation, impact cushion, vibration absorption. Major foam materials are polyurethane (PU), polystyrene (PS), polyethylene (PE), polypropylene (PP), poly(vinyl chloride) (PVC), polycarbonate (PC); the order is roughly based on the amount of annual consumption.
Continue reading “Polymer foams”Keynote Vs vibration frequency
From vibrationdata.com, the following table lists vibration frequency for each piano keynote.
Continue reading “Keynote Vs vibration frequency”Optical path for reflection/transmission measurement in Perkin Elmer spectrophotometer
The following figure from Perkin Elmer shows the optical path for transmission and reflection measurements using an integrating sphere.
Continue reading “Optical path for reflection/transmission measurement in Perkin Elmer spectrophotometer”Release mechanism
In the publication, Silicone Release Coatings: A Closer Look at Release Mechanisms, Dr. Glenn V. Gordon et. al. from Dow-Corning explained the release mechanism for release liners in PSA applications.
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The color of an object is determined by illuminant (light source), object, and observer (detector, eyes).
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