Moldagem por injeção

(en) In injection molding, a polymeric material (plastic) is melted and then injected under high pressure into a clamped pair of molds bearing multiple copies of the obverse and reverse design. When the molds open, the solidified plastic items are mechanically ejected and collected. The molds are hydraulically opened and closed, and water-cooled to quickly solidify the plastic. In a variation called insert molding, an item made of a different material (e.g. metal) can be inserted in the mold so that the plastic flows around it.

Injection molding resembles casting in many ways, but the higher applied pressure and lower melting point of the substrate allow for a combination of sharper details and mass production efficiencies.

Plastic casino chips and souvenir tokens are examples of injection molded exonumia items.