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The 5G era is approaching, and the mobile phone casing material will be recycled from plastic to metal and non-metal materials. Because of its low cost, plastic is favored by the low-end market. The new IMT process has made plastics white and rich and has become the choice of many CMF designers.
IMT (Inner Molding Translate label) or (Insert Molding Three-dimensional) is an integrated and extended IML (In-Mold Label) technology and IMR (In-mold Roller) technology. New craftsmanship.
It brings together the advantages of various decorative technologies, adopts the advantages of the IML process in FILM production, draws the advantages of IMR injection molding into in-mold transfer, combines digital and offset printing effects with traditional screen printing processes, and enables IMT processes. With strong applicability and wide application, it has made up for the limitations of the traditional appearance decoration technology and has met the high-level innovation requirements for product appearance decoration. 3D stereoscopic effects and product stretching meet the in-mold decoration process for more products. Currently in Japan, German technology is more advanced.
The emergence of the IMT process will replace the current industry's fuel injection, UV coating, electroplating, vacuum color plating, silk screen printing, pad printing and transfer printing processes, will drive product innovation across the industry, to achieve a three-dimensional, color Gradient, R-angle and other irregular product appearance decoration effect, while providing the appearance of the process design industry to provide better innovation and platform implementation.
IMT process flow
1. Substrate (PET, PC.TPU)
2. UV transfer (The lines can be diversified. Currently some companies can open UV molds)
3. Silk screen release agent (for substrate and plastic peeling)
4. Silk screen LOGO
5. Optical plating (can be a variety of colors, such as Samsung S8 gold, silver, blue and black purple)
6. Screen printing background color (one or two black, or other colors)
7. Screen printing varnish (mainly to prevent red ink, one or more channels)
8. Printing adhesive (in order to combine with plastic)
9. Sheet Roll Forming
10. Sheet trimming
11. Remove the diaphragm (some have two films)
12. Sheet and plastic injection molding
13. Non-covered diaphragm vacuum coating (middle frame)
14. Strip IMT partial sheet, spray UV
15. CNC post processing
Figure: OPPO A79 IMT process
At present, Huawei and OPPO are used in some models. The IMT process is long and involves more texture design, raw materials, and automation vendors.
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