ExPlus Company Profile

In a previous article, we introduced inner layer processing and pretreatment, but this time we will focus on dry film within that context. Traditional Dry Film Process A photomask is used to transfer the design onto the dry film through exposure. Development processing is carried out to remove the unexposed areas and leave the pattern. Etching or electroplating is performed. Application scene: Suitable for mass production of PCBs with moderate specification requirements.

In addition to E-tests and several other tests, there are advanced tests to ensure the reliability of PCBs. This is called aging tests or accelerated life tests. For applications that require long-term operation without failure, this type of testing can confirm whether the PCB can withstand wear from operation and time. Some specific environmental simulation tests can validate the reliability of materials using programmable temperature and humidity chambers. Below are the tests we conducted and the test conditions. High Temperature and High Humidity Test Objective: To understand the impact of moisture absorption on the reliability performance of materials through environmental simulation. Conditions: 85°C/85% (Temperature/Humidity) Test Duration: 168 hours to 2000 hours (168 hours is approximately 875 days)

"The number of layers in a PCB" The number of layers in a PCB is determined by the number of copper layers. For example, if the design includes only one copper layer, it is a single-sided PCB. If there are two copper layers, it is a double-sided PCB, and if there are more than two copper layers, it is referred to as a multilayer PCB. Please refer to the diagram below. "Manufacturing Process of Multilayer PCBs" How do PCB manufacturers produce multilayer PCBs? Below, we will explain using a 6-layer substrate as an example. The PCB manufacturer first completes the inner layers and then laminates them with insulating material (prepreg) in between the completed inner layers. Once all layers are correctly positioned, they are pressed together into one. "Double-sided PCB vs. Multilayer PCB" The difference between a double-sided PCB and a multilayer PCB is that a double-sided PCB does not have inner layers and does not require a lamination process. "Single-sided PCB vs. Multilayer PCB" On the other hand, a single-sided PCB does not have inner layers and does not require a PTH (plated through hole) process.