Seven, peelable printing materials Peelable printing material is a kind of printing material that provides temporary protection and masking during production and processing. It usually requires toughness of the film layer, resistance to acid, alkali, chemicals, impregnation of tin-lead solder, and appropriate mechanical impact resistance. It has good stability and is removed by hand or simple tools after finishing.
A wooden crate has a self-supporting structure, with or without sheathing. For a wooden container to be a crate, all six of its sides must be put in place to result in the rated strength of the container. Crates are distinct from wooden boxes. The strength of a Wooden Box is rated based on the weight it can carry before the top (top, ends, and sides) is installed, whereas the strength of a crate is rated with the top in place. In general conversation, the term crate is sometimes used to denote a wooden box.
Although the definition of a wooden crate, as compared to a wooden box, is clear, construction of the two often results in a container that is not clearly a crate or a box. Both wooden crates and wooden boxes are constructed to contain unique items, the design of either a crate or box may use principles from both. In this case, the container will typically be defined by how the edges and corners of the container are constructed. If the sheathing (either plywood or lumber) can be removed, and a framed structure will remain standing, the container would likely be termed a crate. If removal of the sheathing results in no way of fastening the lumber around the edges of the container, the container would likely be termed a wooden box.
The peelable printing material used in printed boards is mainly used to protect conductive printed carbon paste printing buttons, gold-plated keys, and plug parts, and is used as a solder resist for electronic component assembly, partial soldering, and damage resistance for shape machining. Its printing process conditions are as follows:
60 to 100 mesh screen, photosensitive film thickness 100 ~ 120μm, scraper hardness selection of 60 ~ 65 degrees, heat curing temperature 150 °C, 5 ~ 8 min. For some UV-curable UV curable lamps, three 80 W/cm2 lamps with a distance of 10 cm and a conveying speed of 2 to 3 m/min, the curing time is much longer due to the thick film layer. Clean the screen with benzene alcohol solution or special wash screen solvent.
After the assembly or processing is completed, the removed film layer can be peeled off by hand or tweezers without any adverse effect on the masking substrate. 
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