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Refers to the body of a roll. Such defects as gouges and cuts are not common, however, they do occur. The damage will always be observable when the roll wrapper has been removed and often before. When the core rotates at a different rate than the surrounding roll.
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Slot-die coating is a coating technique for the application of solution , slurry , or extruded thin films onto typically flat substrates such as glass, metal, paper, fabric or plastic foils. The process was first developed for the industrial production of photographic films in the 's. Slot-die coating produces thin films via solution processing. The slot-die has a high aspect ratio outlet controlling the final delivery of the coating liquid onto the substrate. This results in the continuous production of a wide layer of coated material on the substrate, with adjustable width depending on the dimensions of the slot-die outlet. By closely controlling the rate of solution deposition and the relative speed of the substrate, slot-die coating affords thin material coatings with easily controllable thicknesses in the range of 10 nanometers to 's of micrometers after evaporation of the precursor solvent. Commonly cited benefits of the slot-die coating process include its pre-metered thickness control, non-contact coating mechanism, high material efficiency, scalability of coating areas and throughput speeds, and roll-to-roll compatibility.
In any coating process, a variety of problems may be encountered. Often such problems may be related to formulation issues that have been compounded by those associated with processing. This article will center on various sugar coating defects, causes, and possible remedies. This is caused by excessive use of insoluble fillers and pigments. It can be resolved by addition of small quantities of polymers such as cellulosics, PVP, acacia, or gelatin to one or more of the various coating formulations. Tablet cores that expand, either during or after coating, are likely to cause the coating to crack.
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COATING AND DRYING. DEFECTS. Troubleshooting Operating Problems. Second Edition. EDGAR B. GUTOFF. EDWARD D. COHEN. Chapter 11 authored by.
A web is a long, thin, and flexible material. Common webs include foil , metal , paper , textile , plastic film , and wire. Common processes carried out on webs include coating , plating , and laminating. A web is generally processed by moving over rollers.
This paper reviews stress development mechanisms and stress measurement techniques for polymer coatings. Most polymeric coatings shrink during and after solidification due to chemical reaction, solvent evaporation, phase separation, or some combination thereof. Coating adhesion, however, prevents shrinkage from occurring freely; this frustration of in-plane shrinkage leads to a tensile stress in the plane of the coating.
Slot-die coating is an extremely versatile deposition technique in which a solution is delivered onto a substrate via a narrow slot positioned close to the surface.
Личная массажистка разминала затекшие мышцы его шеи. Погрузив ладони в складки жира на плечах шефа, она медленно двигалась вниз, к полотенцу, прикрывавшему нижнюю часть его спины. Ее руки спускались все ниже, забираясь под полотенце. Нуматака почти ничего не замечал. Мысли его были. Он ждал, когда зазвонит прямой телефон, но звонка все не .
В комнате творилось нечто невообразимое. Техники обнимали друг друга, подбрасывая вверх длинные полосы распечаток.
Сьюзан заглянула в распечатку через плечо Джаббы. - Выходит, нас атакует всего лишь первый набросок червя Танкадо. - Набросок или отшлифованный до блеска экземпляр, - проворчал Джабба, - но он дал нам под зад коленом. - Не верю, - возразила Сьюзан. - Танкадо был известен стремлением к совершенству.
Победа любой ценой? - улыбнулась Сьюзан. Защитник Джорджтауна перехватил опасную передачу, и по трибунам пронесся одобрительный гул. Сьюзан наклонилась к Дэвиду и шепнула ему на ухо: - Доктор. Он смотрел на нее с недоумением.
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Coating and Drying Defects: Troubleshooting Operating Problems, A practical guide for ensuring a defect-free coating and drying process.