The shield is a tool used to shield electronic signals, and its role is to shield the influence of external electromagnetic waves on the internal circuit and the electromagnetic waves generated inside the external radiation, to prevent electromagnetic interference (EMI), and to shield the components on the PCB board and LCM. It is mainly used in mobile phones, GPS and other fields.
The following case is the selection of white copper production shield:
Before Cleaning
A precision Metal Co., Ltd. is a first-level supplier of VIVO OPPO, mainly providing shielding products produced by white copper. Most of its products are cleaned by hydrocarbon cleaning agents (ultrasonic hydrocarbon cleaning → ultrasonic hydrocarbon rinsing → ultrasonic hydrocarbon rinsing → drying). However, there is a key die-cutting product, in the use of hydrocarbon cleaning agent for cleaning, high temperature welding, the surface of the yellow rubber will appear foaming phenomenon, this problem seriously affects the quality of the product, has been plagued by customers, during the period has also sought a number of water-based cleaning agent manufacturers to solve the problem, after repeated samples, After the product is washed with water-based cleaning agent, there is still yellowing, watermark residue and blistering after welding (the product defect rate reaches more than 30%). After the recommendation of its customers to find K-renown environmental technology, to solve the cleaning problem.
Before Cleaning
In accordance with customer requirements without changing its existing production equipment and production process (cleaning process: Under the premise of ultrasonic cleaning → ultrasonic cleaning → pure water rinsing → pure water rinsing → pure water rinsing → pure water rinsing → dry) K-renown Technology senior research and development team has customized the white copper oil removal cleaning agent for customers after many experiments and verification. The surfactant uses a unique combination technology, which has a good emulsification of oil on the surface of the product. Separation and penetration, and due to the addition of copper protective agents, the defective rate of the product in the cleaning process is effectively controlled (the defective rate is below 3%), and in the later high-temperature welding process, the yellow glue is not easy to bubble. Greatly reduce the product defect rate and operating costs of the enterprise. Improve production efficiency.
After Cleaning
| Min | Surface and oil contaminant | Yield (%) | Appearance |
| 1 | Removal rate of 85%(gravimetric) | 85 | Bright, no yellowing, no watermark |
| 2 | Removal rate of 85%(gravimetric) | 90 | Bright, no yellowing, no watermark |
| 3 | Removal rate of 85%(gravimetric) | 98 | Bright, no yellowing, no watermark |
After repeated testing results show that K-renown white copper water-based cleaning agent solves the problems that white copper is easily cleaned with water-based cleaning agent, such as yellow surface of the product, watermark residue and unstable high-temperature welding performance.
