May10
How to Bake PCB? Baking Conditions and Methods, Why Expired PCBs Need to Be Baked Before SMT or Reflow Soldering?

post on May 10, 2023

為什麼過期的PCB要先烘烤才能打SMT或過爐？

For many engineers, they may not understand why PCBs must be baked before going through the SMT reflow oven if they have expired their storage shelf life. Or perhaps, they believe that PCBs should be baked regardless of whether or not they have expired. But do you know why PCBs need to be baked after they have expired? And what are the limitations of PCB baking?

The main purpose of PCB baking is to remove moisture and humidity, which may be contained within the PCB or absorbed from the external environment. Because some materials used in PCBs are susceptible to the formation of water molecules. Additionally, PCBs that have been produced and stored for a certain period may absorb moisture from the environment. “Water” is one of the main culprits of PCB delamination or popcorn, and it also contributes to oxidation.

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PCB/FPC/PTF, Process, Quality     WorkingBear    Views (6,593)     comment (0)
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May02
Differences, advantages, disadvantages, and recommendations for SMD and NSMD pad designs

post on May 2, 2023

Do you know what are the SMD (Solder Mask Defined) and NSMD (Non-Solder Mask Defined) land pattern pads? Any difference between SMD and NSMD pads? What are the advantages and disadvantages for them? What are the design recommendations for them?

Many people in the electronics industry may have heard of “SMD (Surface Mount Device)” of  electronic components” and “SMT (Surface Mount Technology)” of soldering technology, but may not know what NSMD is. In fact, SMD and NSMD referred to here are the exposed copper pads or land pattern layout design seen on the PCB. This kind of small detail in PCB pad design was not even noticed by anyone in the past, but has become increasingly important due to the trend of electronic components becoming smaller. Because it affects the quality of solder and the strength of soldering.

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Design, PCB/FPC/PTF, SMT, Soldering     WorkingBear    Views (6,841)     comment (0)
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Apr28
Introduction to the structure, characteristics and precautions of Printed Circuit Board materials

post on April 28, 2023

PCB matereial composition structure

The PCB substrate is composed of layers of Copper Clad Laminate (CCL) and Prepreg (PP). CCL consists of three main components: Copper Foil, Reinforcement, and Resin Matrix. Since the start of lead-free manufacturing processes, the fourth item of Fillers has been added to the PCB material in large quantities to improve its heat resistance.

We can imagine copper foil as the blood vessels in the human body, used to transport blood, while in PCBs, they are used to transmit electronic signals. Reinforcement materials can be imagined as the bones in the human body, used to support and strengthen PCBs so that they don’t collapse. And the resin can be thought of as the muscles in the human body, which are the main components of PCBs.

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Design, PCB/FPC/PTF     WorkingBear    Views (2,072)     comment (0)
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Apr25
Four Solutions for Quickly Removing labels from Carton and Devices

post on April 25, 2023

At Workbearing’s electronic manufacturing service (EMS) factory and warehouse, products often need to be reworked for various reasons, such as customer requests or converting products for inventory purposes. While removing labels is not the most crucial task in the rework process, there is a need for a better and efficient way to remove labels without causing damage to the product or packaging box.

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Process     WorkingBear    Views (1,769)     comment (0)
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Apr21
Understanding Moisture Sensitive Devices: A Guide for Manufacturers

post on April 21, 2023

A parting line and gaps will appear between the joining surface of top and bottom molds in IC package

Moisture Sensitive Devices (MSD) refer to electronic components that are sensitive to moisture.

Moisture, also known as humidity, refers to the amount of water vapor in the atmosphere that the components are exposed to. The environment is typically the factory floor or production line, as well as any environment the components are exposed to after being removed from vacuum-sealed packaging.

Please note that liquid or solid water cannot be counted as part of humidity! In fact, the human body can feel humidity. In a high humidity environment, you can feel that sticky sensation, like when it’s about to rain but hasn’t started yet, and your whole body feels damp.

read more…》

Manufacture, Moisture Sensitive, Process, Quality, SMT     WorkingBear    Views (4,287)     comment (0)