Paper models, also called card models or papercraft, are models constructed mainly from sheets of heavy paper, paperboard, or card stock. This may be considered a broad category that contains origami and card modeling. Origami is the process of making a paper model by folding paper without using glue. Card modeling is making scale models from sheets of cardstock on which the parts were printed, usually in full color. These pieces would be cut out, folded, scored and glued together. They are generally more popular in Europe and Japan than in the United States. Sometimes the model pieces can be punched out. More frequently the printed parts must be cut out. Edges may be scored to aid folding. The parts are usually glued together with polyvinyl acetate glue (white glue PVA). In this kind of modeling the sections are usually pre-painted, so there is no need to paint the model after completion. Some enthusiasts may enhance the model by painting and detailing. Due to the nature of the paper medium, the model may be sealed with varnish to last longer. Printed card models became common in magazines in the early part of the 20th century.
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