Plastic products come in a variety of surface finishes, such as painting and matte finishes. Adding expression to the surface in this way is called “decoration”, but I investigated what kind of method there is.
Plastic products are surface-finished (decorated) for the purpose of design and functionality. The timing of decoration is classified into mold processing, molding, and post-molding surface treatment.
Transferred to molded products by mold processing
A pattern is formed in the mold cavity and transferred to the molded product as it is.
| Texture processing | sand blast | By spraying fine abrasive material on the mold cavity to form unevenness, it gives a cloudy texture. The roughness of the surface is controlled by the size of the abrasive particles and the strength of the shot. |
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| Photo etching | Anticorrosion treatment is applied by masking (photoresist), and unnecessary parts are removed with a corrosive agent such as an etching solution to form the desired shape. | |
| Pear-skin | The surface of the cavity is brought into contact with acid to form irregularities by a chemical reaction. Random unevenness can be created by sandblasting, but regularity and continuous unevenness can be obtained. A molded product that is more durable than sandblasting can be obtained. | |
| Mirror finish | Polish the cavity with a grindstone, paper, diamond, etc. to form a mirror surface. | |
| Sculpture | The mold is cut to form irregularities. | |
Processing during molding
| In-mold transfer | By sandwiching the designed film in the cavity and molding, the design is transferred to the surface of the molded product. It is possible to paint on complicated 3D molded products. |
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surface treatment
Post-processing is performed after molding, but it is necessary to finish the mold surface in advance depending on the finished product.
| Painting | Apply paint to the product and cover it with a film of paint. |
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| plating | Immerse in an aqueous solution in which metal is dissolved to form a metal film on the product surface. |
| Vapor deposition | It evaporates metals and oxides to form a thin film on the product surface. |
| printing | Apply ink to the product and cover it with an ink film. |
| Water transfer | Column # 2 Float a special film in a water tank and transfer the special film by the action of surface tension when the product is submerged. |
・ At the beginning of the mold try, make the mold surface a satin finish and check the shape and function. At the final stage, the surface of the mold is polished and grain is added.
-The required draft differs depending on the appearance finish such as grain. It is required to determine some appearance specifications at the time of mold design.
The decoration of plastic is important to express the atmosphere of the material!
As an aside, I used to wonder if plastic and resin refer to the same thing. it’s the same. In English, the word resin Resin is also commonly used to refer to ordinary resins, but in Japan it is used in specific fields such as the field of stereolithography and, more recently, the field of handmade accessories. When thinking about SEO, it is important to understand the “semantic space (the world in which words exist)” that words have.
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