With the application of 3D glass and the change of cell phone size, the mobile phone needs a stronger middle frame, so we need to go to harder and lighter metal. The secondary treatment of the stainless steel and titanium alloy cell phone case must be PVD, then why stainless steel and Titanium alloys will be the first choice for high temperature nylon. The following is a summary of DSM's conference speech on the 6th Mobile Shell Forum in 2017.
As for the development trend of mobile phones, if we look at the time line of two to three years or three or five years, the thinner, lighter, more functionally integrated and waterproof, is a clear trend that I see in the future mobile phone development. Therefore, in terms of plastics, there are actually some opportunities for industrial upgrading.
First, the changes in mobile phone shell materials, promote the development of nano-injection technology
Nano-injection molding has been very mature in the consumer electronics industry in the recent five or six years.
The mobile phone casing material from the very beginning with aluminum, because it is very good processing, but also nano-injection molding, but also anodizing, but in the use process, designers and consumers have been somewhat unsatisfied where - aluminum is too soft Therefore, every person's mobile phone will need a protective cover, and everyone will make a great contribution to the industry of the protective cover.
With the increasing size of mobile phones, including the overall screen that people see today, the weight of mobile phones may increase. Our mobile phone casing material has evolved from the past 6 series aluminum (insufficient strength) to 7 series aluminum, and even then, the iphone6's bent door still buzzed up. In the final analysis, what do we need?
Because of the application of 3D glass and the change in the size of mobile phones, mobile phones need a stronger middle frame, so we need to go to harder and lighter metals, and the harder and lighter metal, the first thing we think of is stainless steel. The second is titanium alloy. So the application of nano-injection technology from stainless steel 304 to 316/316L and titanium alloys, including our today's liquid metal. DSM can provide a complete solution for nano injection molding of stainless steel and liquid metal.
Second, DSM high-temperature nylon in mobile phone stainless steel, titanium alloy nano-injection application
The secondary treatment of stainless steel and titanium alloy cell phone housing must be PVD. DSM has two grades in PVD stainless steel, titanium alloy and magnesium alloy processing. The first is NMX33 for ForTii substrate and NMX53 for ForTii Ace substrate.
The biggest difference between these two materials is the difference in temperature resistance. Because in the middle of the secondary PVD process, when the customer needs a higher PVD temperature and wants a stronger and stronger coating, our materials can withstand temperatures above 280°C. In addition, DSM has PBT product line and PPS product line in this block, so we can provide a whole solution for everyone in the whole nano injection molding process.
Third, the advantages of DSM high-temperature nylon in mobile phone casing nano injection
Bonding force is a topic that nanomolding injection can't go around. The bonding force of ForTii NMX33 on stainless steel reached 47 MPa. The bonding strength of PBT/PPS on aluminum will probably be about 30MPa~35MPa. DSM's Fortii Ace also has a high degree of integration.
Figure ArniteTM and FroTiiTM combined force diagrams, taken from DSM
In the past few years, we have also communicated and cooperated with various industry processing companies. We are constantly revising our materials to adapt to more and more extensive supply windows. We have picked several large treatment plants that are more famous in the industry. The results of the tests show that we have a relatively stable binding force.
Nano-injection molding is not the end of the entire process after injection molding. This product does not require plastic. Engineering plastics is a very basic industry, so he will run through the whole process of manufacturing. So in the later stages of CNC, polishing, even PVD, laser laser engraving and deplating, we all follow the whole process of the industry chain. The manufacturers together opened up the entire process of nano-injection of stainless steel plus PVD.
That DSM PA4T in this solution, equivalent to PBT/PPS, has a very obvious advantage, higher binding power, higher temperature resistance, so for the PVD back-end process technology, there will be a big help . And compared to PBT, the PA4T's mechanical performance and wider color space is also one of the advantages.
The following figure is the color space of DSM nylon, so nylon is not only black as everyone thinks, but can do color, but in the past everyone in the market did not have this demand.
Figure NSM's nylon color solution, taken from DSM
In addition to nano-injection molding, today we have also talked about the 5G signal problem of mobile phones. At the same time, we also talked about the fact that glass-ceramics do not shield signals. In fact, a few years ago, when we were doing the mobile phone industry, we would divide the North American, European, and Asia-Pacific versions because of different antenna systems and different communication formats. Today, when you go to the market to buy a mobile phone, you can see that there is a very big gimmick that is Netcom. All Netcom gives everyone the biggest challenge on an antenna, that is, you need to cover about fifty communication frequency bands, and these requirements will be reflected in another direction—LDS.
Four, DSM high-temperature nylon in the case of mobile stainless steel nano injection molding
We share two cases for stainless steel nano injection.
The following figure, this is a mobile phone released by a manufacturer, is a seven-year process of disgusting craft, DSM has the privilege to participate in their development.
Figure Nano Injection + PVD Case Sharing, Intercepted from DSM
The second mobile phone is very familiar to everyone. In the long time ago, Seiko's speech also said that it should be the highest proportion of screen mobile phones before this - essential PHONE, this phone is also using DSM's ForTii material with titanium alloy Nano-injection plus PVD process.
Figure Nano Injection + PVD Case Sharing 2 Intercepted from DSM
The above are two of the few cases we have been doing in the past year and we have made a sharing for everyone.
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