Introduction to the injection molding process of smartwatch three-color strap

Generally speaking, there are two parts of a smartwatch that demonstrate CMF design capability: the Watch body itself and the Watch Band. Compared to the current structure of the watch body (case, bezel, bezel, crown, etc.), no matter the type of material, shape, texture, structure and color styles, the future of the watch band will have a higher degree of freedom in CMF design.

Just earlier this year, oppo had released a watch with a three-color oil pressure wristband. Through the mold, the blue layer, two translucent layer a total of three layers of strap prepared by oil pressure shaping, combined three into one. Taking into account the aesthetics, skin-friendly and comfortable touch, dirt and oil resistance and other characteristics.

The three-color strap can be molded in one shot through the injection molding process, and can achieve multi-color, surface texture and other effects, making the product more cool and beautiful. In this article, let's learn more about it. Mainly include:

I. Three-color watchband and production process ideas II. process flow analysis III. three-color injection molding related equipment and mold show IV. multi-shot implantation technology in the field of smart watches

CMF Design Corps has set up a smartwatch CMF industry chain exchange group, aiming to gather a group of professional elites from upstream and downstream enterprises of the industry chain to do industry exchanges and resource docking around materials, design, process and development trend. Add CMFDESIGN008 to join the group, and note that you have to note "smartwatch" Oh~~!

I. Three-color watchband and production process idea

Generally speaking, the three-color watchband is generally required to be made of soft rubber and soft touch material, and the three colors are a whole and do not lose color. This requirement is actually quite high, ordinary spraying process is difficult to achieve; if it is twice implanted plastic injection molding process, the efficiency is not high and the yield rate is low.

So how to realize the three-color production process of the strap? At the same time to ensure high production efficiency and product quality? Recently, I learned in the exchange with modern precision, the three colors of the strap can be split into three plastic parts, with a 3-shot 6-station vertical injection molding machine three-color injection molding, a molding. Let's continue to look at the process flow~~

Second, process analysis

Three-color strap injection molding process is divided into four processes: injection of the inner strap → injection of transparent buckle → injection of the outer strap → take out the finished product. As shown in the figure below:

The above 4 processes can be carried out at the same time to achieve efficient production. At the same time, the three-color injection molding makes the inner strap, transparent buckle and outer strap closely integrated into a whole, which ensures that the finished products are of good quality.

Three, three-color injection molding related equipment and mold show

To realize the three-color strap of Smart Watch, you can choose 3-shot 6-station vertical injection molding machine, this equipment has 3 injection stations can be injected at the same time, and can realize 3-color 3-material products in one molding, of course, you can also single-shot or double-shot injection molding production. Of course, it can also be used for single-shot or double-shot molding.

Fig. 3-color vertical injection molding machine and the name of working parts.

Figure 3-color strap mold composition

Fourth, the development of multi shot implantation technology in the field of smart watch
Three-color injection molding, which can also be called multishot implantation technology, is not only used in the production of watch bands, but also widely used in the watch body itself, and it may become one of the core technologies in the market of plastic structural parts for smartwatches, which is becoming more and more important. Multi-shot implantation technology not only can realize multi-material and multi-color combinations, but also can implant corresponding hardware, electronic chips and other internal components in the structural parts, thus realizing multi-functional integration of the product, greatly reducing the assembly process, and saving the cost of product production.

The left ones in the middle row are three-color injection-molded cases, taken at the Hyundai Precision booth.

This solution can truly realize the features of miniaturization, intelligence, multifunctionality and personalization of products, and has unique advantages in the field of precision injection molding products with small area functions. It has great potential for development in the current hot smart wearable field, including smart watches, headphones, bracelets, ARVR glasses, etc.