pcb
Home > Blog

Posts Tagged ‘PCB’

X-ray Inspection in PCB Assembly
Wednesday, June 15th, 2022

X-Ray Inspection’s Definition

X-ray inspection is a technology used to inspect the hidden features of the target objects or products. As for PCB inspection, X-ray is commonly used in the inspection of PCB assembly in order to test the quality and find the hidden defects, X-ray inspection is one of the most important steps for quality-oriented PCB manufacturers.

X-Ray Machine

X-Ray Inspection’s Working Principle

Generally, there are three elements in the X-ray devices.

  • X-ray tube—to generate the X-ray photons.
  • Operation platform—to move along with the sample so that the sample can be inspected from different angles and magnification.
  • Detector—it can capture the X-ray through the samples and then transfer it into the image so that we can find out whether there are defects on the printed circuit board.

The Hidden Defects that can be Identified by X-Ray

Since PCB has the higher density with the solder joints hidden and holes buried or blind, X-ray enable us to inspect the quality of the PCB and identify various hidden defects. And there are three common hidden defects that can be inspected by X-ray.

PCB’s Image Under X-Ray
  • Solder bridges—it is a common issue that will occur when the solder joints are so close that they create a connection which is not allowed. And usually, the solder bridges will be covered by some components on the PCB. But they can be easily found with the help of the X-ray device.
  • Solder voids—when gas or flux is entrained during welding, solder voids will be produced, which will lower the thermal conductivity at the solder joint and may cause physical defects. And X-ray can help to  identify the solder voids
  • Pin-hole fills—pin-hole fills issue is a common problem occurring in the plug-in components on the  printed circuit boards. The X-ray device can be used to identify these errors, and can even quantify the missing filling amount.

Our X-Ray Inspection Device

The maximum size of the board that can be put in the device’s operation platform is 510*430 mm, while the maximum inspection size of the device is 435*385 mm. So here is the manifestation of the operation platform’s function. When the size of PCB is over 435*385 mm, the operation platform will move along with the board so that the board can be inspected thoroughly.

And here is a video about operation of our X-ray inspection device.

So, this is the end of this article. In case if you have any questions, you are welcome to contact us via email at  sales@bestpcbs.com. We are fully equipped to handle your PCB  manufacturing requirements.

You may also like

Types of Vias
Friday, May 20th, 2022

What is via?

A via plays an important role in multi-layer PCBs. It is used to make an electrical connection between the layers of a multi-layer PCB. Generally speaking, every hole in the printed circuit boards can be called as via.

A via is constructed by placing copper pads on each layer of the PCB and drilling a hole through them. And the hole is plated with copper that forms electrical connection through the insulation that separates the copper layers.

PCB Vias

Types of Vias

There are three main types of vias used in PCB: through-hole via, blind via and buried via.

Through-Hole Via

Through-hole via goes right through the printed circuit board from top to bottom and can be used to connect all the layers of a PCB. It is the most common via and is easiest to construct.

Blind Via

Blind via connects the outermost layer of a PCB to the next layer. Namely, it cannot be seen on the other side of the board and is therefore called blind via.

Buried Via

Buried via is used to connect internal layers of a PCB. And it cannot be seen on the surface of the board.

Via Types

In addition, it is always better to use multiple smaller vias rather than one large via since smaller vias can reduce the inductance and also provide an additional path to the current flow in case any of the vias fail.

So, this is the end of this article. In case if you have any questions, you are welcome to contact us via email at  sales@bestpcbs.com. We are fully equipped to handle your PCB  manufacturing requirements.

You may also like

3M Epoxy Adhesive DP190-Gray & 3M Epoxy Adhesive DP190-Translucent
Friday, April 22nd, 2022

Both 3M Epoxy Adhesive DP190-Gray and 3M Epoxy Adhesive DP190-Translucent are a two-part epoxy adhesive that delivers exceptional performance with high shear and peel strength.

They can bond to a wide range of materials, such as metals, ceramics, wood, fiberboard, glass, rubber and many plastics. So, PCB is no exception. But what are the similarities and differences between them?

Similarities

  • Provide tough, strong bonds through high shear and peel strength.
  • Capable of bonding to a wide variety of different materials.
  • Deliver extended work-life, providing additional time for adjustment.
  • Exhibit good environmental aging properties, delivering long-term durability.

Differences

3M Epoxy Adhesive DP190-Gray has a moderately high modulus. With a 90-minute work-life, it reaches handling strength in approximately 10 hours and full cure in 7 days at room temperature.

Additionally, this epoxy adhesive has medium viscosity and self-leveling with a 1:1 mix ratio by volume. But its flexibility and elongation are moderate.

(3M Epoxy Adhesive DP190-Gray)

3M Epoxy Adhesive DP190-Translucent has a moderately low modulus. With an 80-minute work-life, it reaches handling strength in approximately 10 hours and full cure in 14 days at room temperature.

It has low viscosity and self-leveling with a 1:1 mix ratio by volume. Additionally, it features high flexibility and elongation.

3M Epoxy Adhesive DP190–Translucent

This is all about the similarities and differences between the 3M Epoxy Adhesive DP190-Gray and 3M Epoxy Adhesive DP190-Translucent. It is supposed that you have known about them.

But if you still have any questions about them or PCB, please feel free to contact us. Because at Best Technology, we are fully equipped to handle your PCB manufacturing requirements.

You may also like

Can you tell the difference between PWB and PCB?
Wednesday, May 20th, 2020

The abbreviations PWB and PCB are very common, especially in the field of electronics manufacturing. Therefore it is necessary to gain a clear understanding of the meaning of each one and the differences between the two. On this article, we will help our readers to distinguish PWB from PCB.

pcb vs pwb
pcb vs pwb

PCB: Based on insulating substrate, it means a kind of products on which the wires are connected and components are printed from point to point on a dielectric substrate in a predetermined design. It is the English abbreviation of Printed Circuit Board.In a word, PCB stands for printed circuit board, where the width, side to side and multi-layer relationship(spacing) of conductor runs has or is designed to have a specific effect on circuit operation other than just a point to point connection.

PWB: Based on insulating substrate, it means a kind of products on which the wires are connected from point to point on a dielectric substrate in a predetermined design. However, there is no printed component on it. PWBs are the early name of the British, because at that time there were only circuit diagrams on the circuit board, but no printed components. So they belonged to the more primitive board. Under its effect, now many traditional British and some Hong Kong people still call the circuit board to be PWB, which is the English abbreviation of Printed Wire Board. In a word, PWB stands for printed wiring board, one of the first uses when the issue was only a point to point connection.

The PCBs are the boards already equipped with various components, however the PWB is just a designed substrate with no components.

pcb vs pwb
pcb vs pwb

Moreover, PWB vs PCB greatly varies from one region to the other. For example, in the United States of America, the term Printed Circuit Board is more common in use while the use of the name PWB is more commonly used in Japan. In Japan, PWB is more preferred that PCB because it prevents confusion with another name, polychlorinated biphenyls, which refers to a particular poison available in Japan.

For your more information, in approximately 1999 the IPC Technical Activities Executive Committee made a mandate to only use the term PCB for all new document development because more often than not the printed circuitry design will have an impact on function.

If you are still confused or have any queries or comments about PCB, do not hesitate to contact us. Our sales team can give you a reply at our soonest convenience.

You may also like

3 Steps to Recycle PCB
Friday, January 25th, 2019

Everything will break if it has been operated for a long time, especially electronic products. However, the broken items, which can be recycled, are not completely waste, and the printed circuit board is the same. With the development of technology, the amount of electronic products increase rapidly. Their operating cycles are shortening and many products are discarded without damage, resulting in serious waste. Meanwhile, there are some substances of electronics will d harms to the environment. Therefore, it is required to recycle them.

There are many kinds of metals in PCB, including aluminum, copper, gold etc.. It also has amount of high polymer from petroleum directly or indirectly, which have high calorific value. They can be used to generate energy as well as related chemical products. Many of them are toxic and harmful, and if discarded, they will cause great pollution.

1. Paint Removing

The surface of the printed circuit board is coated with protective metal, so it is required to remove the paint if you would like to recycle the PCB. The paint strippers can be divided into organic one and alkaline one. The organic paint stripper is highly toxic and harmful to human body and environment. It can be dissolved by heating with sodium hydroxide and corrosion inhibitor.

 2. Crushing

After the paint on the PCB was removed, it will be crushed by the methods of impact crushing, extrusion crushing and shear crushing. Ultra-low temperature freezing crushing technology is commonly used, which can cool the tough materials and make them fragile and crush, so that metal and non-metal can be separated completely.

3. Sorting

The material after crushing need to be sorted according to the characteristics of its components such as density, particle size, conductivity and so on. The methods of sorting usually can be divided into dry and wet methods. The dry sorting includes dry screening, magnetic sorting,  density sorting, etc.. Wet sorting includes hydrocyclone classification, flotation, hydraulic shaker, etc. In this way, the separated substances can be reused.

Best Technology is the premier expert in PCB manufacture of electronics, brings a unique combination of technology and quality that offers a competitive supply of printed circuit board and PCBA. With high qualified engineers, we are able to help you find a PCB with high quality. To find out more, contact Best Technology at 0755-29091601 or check the website: https://www.bestpcbs.com/

You may also like

The Harms and Solutions of Fingerprint on PCB
Wednesday, January 23rd, 2019

The fingerprint is one of the major disasters of PCB and it will also cause the poor products of PCB as well as deterioration of terminal user reliability. However, the manual operation will go through every step of printed circuit board manufacturing. Only every operator forms a good habit and stop touch the PCB with bare-hands, so that can reduce the fingerprint doing the harms to PCBs. As the professional PCB vendor, BEST would like to let you know more details of the harms and provide some solutions for you.

Do not Touch the PCB with bare hands

Do not Touch the PCB with bare hands

The Harms of Fingerprint on PCB
A. If the bare-hands touch the printed circuit board directly, it will result in oxidization of copper. After plating, the fingerprint will appear obviously. The outline of the board will be seriously poor if the plating layer is not flat.
B. Toughing the printed circuit board with bare hands before solder mask, it will decrease the adhesion of the green oil and the green oil will peel off because there are bubbles during HAL (Hot Air Leveling).


C. Touching the PCB after solder mask until package with bare hands will cause unclean surface of boards and poor soldering.
D. There is fingerprint with grease when print wet film or silk screen, it is easy to cause the adhesion of the dry or wet film to decrease, causing the separation of cementation and plating layer during plating.
Solutions
A.It is required to develop a good habit about fetching and putting the PCB.
B.It must wear gloves when touch the printed circuit board.
C.Setting an example and keeping the rule of in mind–do not touch the board with bare hands.
Best Technology is the premier expert in PCB manufacture of electronics, brings a unique combination of technology and quality that offers a competitive supply of printed circuit board and PCBA. With high qualified engineers, we are able to help you find a PCB with high quality. To find out more, contact Best Technology at 0755-29091601 or check the website: https://www.bestpcbs.com/

You may also like

Fantastic Banquet in Best Technology
Saturday, January 19th, 2019

All works and no play makes Jack a doll. All the guys of Best Technology have worked hard in 2018. In order to reward the members who worked really hard, we had a fantastic banquet on January 18, 2019.

At 7 PM, all the staffs attended the party and the party kicked off with the cheering and applaud. To begin with, our general manager Peter gave a speech which showed the conclusion of 2018 and his ambition for 2019.

Peter gave a speech

Peter gave a speech

After the speech finished, we began to reward the staff one by one. Compared with the ceramic PCB, FR4 PCB and metal dome, the flex circuits got the first place. Mrs Celine won the sales champion of flexible PCB.

Celin won the champion of sales

Celin won the champion of sales

Compared with last year, we have more entertainment programs in the banquet of 2018. Dancing, singing and games, all of these programs made us feel relax and forgot the pressure of work.

Dacing

Dacing

What a fantastic banquet we had. Time flies, the beautiful night quickly came to an end and we took a family picture to remember this party.

Family picture

Family picture

2018 has gone, and we will hold hands and work together to achieve the gold of 2019. since throwing his hat into printed circuit board, Best Technology is always dedicated to uphold our mission:to provide the most suitable products and the most satisfying service for our customers. If any interested in rigid PCB, rigid-flex PCB or ceramic PCB, please feel free to contact us at sales@bestpcbs.com or call us at 0755-29091601.

You may also like

The Application of Ceramic PCB in Communication Industry
Wednesday, January 16th, 2019

Time goes by, the communication of human being still reforms constantly. We are surrounded by various of communication tools, including broadcasting, mobile phone, GPS etc.. And they have become an indispensable part in our daily life. The reason why they are able to serve for us is not only depend on the development of science, but also benefit from a kind of media–antenna. Antenna is the key to the communication. If there is a problem, the connection of signals will be lost.

The antenna can be used in various environments, so it is difficult to meet the requirements of itself. In order to ensure that the antenna can work normally, it is necessary to ensure its quality, whether in the selection of material or in the production process.

Ceramic PCB

Ceramic PCB

The common printed circuit board can not meet the performances of the antenna. Nowadays, the most suitable product is the ceramic PCB. The ceramic PCB possesses various benefits as following:

  1. The dielectric constant is small.
  2. Low loss in high frequency.
  3. Having good performance in signal transmission.
  4. High boding strength between metal layer and the substrate of the ceramic PCB.
  5. With good performance in insulation. It will appear high voltage during the antenna is working, but it is incredible dangerous for human being. The ceramic PCBhas nice performance in insulation and the resistance in breakdown voltage is up to 20KV/mm which is able to protect human safety effectively.
  6. It can be used in high density assembly. The line space resolution of the ceramic PCBis able to reach 20μm, so that the lightness and thinness of the communication equipments can be realize.

Ceramic PCB

Thick film ceramic PCB

As a professional printed circuit board in China, Best Technology is always dedicated to catch up with the development of times to fabricate ceramic printed circuit boards with high quality. Withe the development of communication, we would love to provide products that offer a competitive supply of thick film  ceramic PCB and thin film ceramic PCB and other ceramic PCB products. To find out more information, contact Best Technology at 0755-29091601 or check the website: https://www.bestpcbs.com

You may also like

Welcome Our Customer from India
Thursday, January 10th, 2019

On January 9, 2019, we had a visitor from India. Best Technology thanks for having such an excellent partner.

John talked a lot with our general manager Peter and the members of business development department. John brought the material of SMT for us and hope we can make SMT for him. He was satisfied with our company culture and signed his name on the company cultural wall after the meeting came to an end and we took a picture with the client in the office of Best Technology.

Signed the name on the wall

Signed the name on the wall

Took a picture in the office

Took a picture in the office

After that, in order to know more something about capability in manufacturing of us, a member of business development department–Tiffany accompanied John to visit our SMT and PCB factory. They got an exclusive factory tour of Best Technology’s factory.

John and Tiffany in SMT factory

John and Tiffany in SMT factory

John and Tiffany in the PCB factory

John and Tiffany in the PCB factory

The client was satisfied with our high-tech equipment during the visiting. As the professional vendor of printed circuit board and PCBA in China, we will always uphold the mission–to provide the most suitable products and the most satisfying service for customers.

You may also like

3 Defects of Putting Nitrogen into Reflow Oven
Wednesday, January 9th, 2019

We have talked a lot about the defects of putting nitrogen into reflow oven before. Thus, today Best Technology would like to discuss some defects of putting nitrogen in to the reflow oven with you.

reflow oven

reflow oven

√ Nitrogen is very expensive.

√ If the heating effect is better, there will be tombstone effect happening on the resistance and capacitor. This effect is beneficial to most of components, but it will deteriorate the tombstone effect of the small chip.

√ Besides, the nitrogen will also increase the wicking effect of soldering tin, allowing the soldering paste along the fillet weld of the components to climb to a higher place. Maybe it is good for some fillet weld of components, but it is not friendly for some connectors. Because the fillet weld of connectors is the connected to other components. It will cause other problems if tin flows into these connections. What’s more, it will lead to short circuit if the tin climb to a higher place as the fillet welds of connectors are very closely.

PCB with components

PCB with components

Best Technology, a professional PCB solution provider, is always dedicated to catch up with times. Our unique technology and high quality products will give you a competitive supply of printed circuit board and PCB assembly and make your wearable devices more excellent. To learn more, contact us at 0755-29091601 or check our website: https://www.bestpcbs.com

You may also like