In the silicone industry, to meet the user experience of the majority of consumers, multi-color products have always been the best-selling products, the process is used in silicon materials bonding and plastic bonding.
1. Soft and hard plastic two-color design
In the silicon bonding area, several silicon materials will be used to achieve different color silicon, different rubber components, so the multi_k color process is commonly used and is quite popular.
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The two materials must have a certain temperature difference in the melting point. Generally, it is recommended to reach 60°. It is recommended to be at least 30°. The melting temperature of the first shot material is high. Generally, the first shot is PC or PC/ABS, and the second shot is TPU or TPE, PC thickness is 0.6-0.7mm, soft rubber part thickness is required to be 0.4mm or more.
Try to widen the contact area, make grooves to increase the adhesion, or use the core for the first shot, and the second part of the material is injected into the first shot. The surface of the first shot is as rough as possible.
2. Material compatibility
Multi-color injection molded mating materials must meet two basic compatibility conditions. They are compatible with the adhesive compatibility and processing.
3. Transparent and non-transparent two-shot design
(1) Double shot design of small lenses
The first shot is non-transparent, and the second shot is made of a lens. The first shot uses a PC with a high melting point and the second shot uses a PMMA.
(2) Transparent and non-transparent bijective design for decoration
The first shot is a non-transparent material, the second shot is a transparent material, and the non-transparent material is generally a high temperature of the PC material of SABIC, and the second shot transparent material is PMMA or PC. The PC needs to be sprayed with UV to protect it. PMMA can choose uv or fortification. If there are characters on the surface, you must choose UV
The United States is the most important export market for LED lighting products in China. Since the export value of LED lighting products exported to the United States in 2013 ranked first, the US market continued to grow at a high level, with a large total volume, rapid growth rate and abundant product demand. . Export value ranked first In the first quarter of 2015, China's exports of LED lighting products to the United States continued its ultra-high-speed growth, with a total of 390 million US dollars, a year-on-year increase of 57%, accounting for 21% of China's total exports, compared with the first in 2014. The quarter increased by 5 percentage points year-on-year. According to the US Energy Independence and Security Act, the 2014 ban has been implemented for a period of time, and the US domestic economy has gradually recovered in 2014. In addition to the demand for Christmas stocking and decoration in the second half of the year, the third and fourth quarters are traditional exports. In the peak season, these are the driving factors for China's LED lighting products to continue to grow. Figure 1 China's quarterly export value of LED lighting products in the United States Source: China Customs, CSA Research, the price increase, China's LED lighting products exports to the United States, the rapid growth of the United States is mainly driven by the number, mainly reflected in the price increase. From 2012 to the first half of 2013, the number of China's exports to the United States has maintained a growth rate of around 200%, and the price of the same period has dropped by about 10%. And in the third quarter of 2013, the trend began to change, from the price increase to the volume and price, but the volume growth rate began to drop to around 100% from around 200%, and the price rebounded to 2014. The price level in December has rebounded to around $6 per unit in mid-2013. In the first quarter of 2015, the price level plummeted, and by March 2015, the price level was around $4.55. The year-on-year growth rate was -22.3%. Figure 2 China's export prices of LED lighting products in the United States Source: China Customs, CSA Research Figure 3 China's exports of LED lighting products to the United States Source: China Customs, CSA Research