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	Common fabrication flow of mobile phone rubber mold: Preparation of raw material → rubber pressing→ painting → pressing → radium engraving→ final product packaging. 1. Preparation of raw material: Actually this process is to mix original rubber blocks with some proportion ingredients (mainly color powder and other agents) completely, then extrude into plate shape, cut into required rubber slices for following pressing. 2. Rubber pressing: This is the main process. Mistakes are liable to occur, excessive thin or narrow rubber slices will be easily torn when they are taken off (The possible reason for it maybe : when mould temperature is high (about 100℃), strength of excessive thin or narrow rubber slices is insufficient.) An practical example is shown at one of the edges of external sealing part of 20247 buzzer. Burrs will also create (they can not be trimmed off the following pressing process). This kind of burrs created during forming can not be removed. 3. Painting: Special cautions shall be taken during painting, any carelessness will result in high disability rate. Normally two passes of coating with different colors will be applied for following radium engraving. 4. Pressing: Remove unnecessary burrs by punching shear, necessary keys are remained. Rubber used in this process shall have not burrs; Excessive small rounded fillet usually will result in burrs. Thus the minimum rounded fillet shall be not less than 0.5mm. 5. Radium engraving: It is laser engraving, i.e. set level of finished keys, they are normally positioned by tools, then the laser remove the paint on key surface off, call out letters on the keys, such as digit keys are transparent; If there are two layers of paint, then remove only one layer off, such as OK answer key, on/off key with one layer of red paint, another layer of blue paint.

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