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Description of Coating PET plastic sheet roll

Coating process is the process of spraying liquid on the substrate.
Coating technology contains many kinds and can be mainly divided into two categories. The first category is called Dry Coating (such as Vacuum Vapor Deposition) or Chemical Vapor Deposition, etc. Another class is called Wet Coating, which refers to the process when liquid Coating substances are processed on the substrate and then dry and solidify to form films.
According to the difference of hydrodynamics, wet Metering can be divided into two major types, which are post-metering and pre-metered coating methods. It can be described as follows:
a,Post-Metering Coating
The common feature of this type of coating is that the film thickness is affected by the rheological properties of the coating and coating conditions.Dip Coating, which is the most commonly used in industry, thickens with the increase of Coating speed, but it is not proportional to it. If the speed increases again, the thickness will tend to be fixed or decrease instead.Other such as scraper, roller coating is this type of coating.
b,Pre-Metered Coating
The thickness of the coating is only set by the infusion system and will not vary due to the rheological properties of the coating or the change of coating speed. The principle of this type is to transfer a coating from a stable feed Pump to a precision designed Extrusion Die, forming a broad and even film, and then applying it on the base material. Such Coating methods include Slot-die Coating, Slide Coating, Curtain Coating and Gravure Coating, etc.