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How are multiple layer PCB Board Made in a PCB factory

What is PCB

The term “printed circuit board” (PCB) refers to a circuit board composed of layers of metal interconnects, insulators, diodes, and resistors connected in accordance with a metallic design circuit printed on it for electrical conductivity. A PCB is essentially a board that links electronic devices that have electronic circuits on them. PCBs are a common component in a wide range of devices, including televisions, cell phones, computers, and automobiles. They are constructed with components that are soldered onto the board out of materials like copper and fiberglass. Resistors, capacitors, transistors, and diodes are only a few examples of electrical wiring and parts used in PCBs, which connect all the pieces to ensure appropriate operation.

Applications of PCB

PCB boards can be used for many different things, including electronic parts and computer components.

PCB boards serve a variety of functions in our daily lives because they are the basis for all electronic gadgets. Because PCBs are used in manufacturing, it is common to see them marketed as raw materials.

They are used on many different types of electronic devices, including laptops, mobile phones, and computers.

The success of 3D printing technology will determine the direction of PCB production, which is unknown. While larger organizations continue to use traditional procedures for design review and testing, smaller businesses have found traditional PCB manufacturing to be far more cost-effective.

Types of PCB board

Well, a PCB can be of the following different types: There are many factories which are providing different types of PCBs Board all over the world. These are the Largest PCB makers. For more information about these suppliers visits their websites.

  1. Single Sided PCB or Single Layer PCB
  2. Double Sided PCB or Double Layer PCB
  3. Multilayer PCB
  4. Rigid PCB
  5. Flex PCB or Flexible PCB
  6. Rigid-Flex PCB or Rigid-Flexible PCB

Multilayer PCB Board.

A printed circuit board having more than two copper foil layers is called a multilayer PCB. These kinds of PCBs must contain a minimum of three copper or conductor-filled conducting layers. Copper-plated holes connect one layer to the next. The number of layers might range from four to forty. The top and bottom layers are used to build all of the active and passive electronic components. Every single inner stacked layer is intended for routing. Surface-mount components (SMD) and through-hole electrical components can both be soldered on either side of this kind of PCB. Surface Mount Technology and other PCBA tools can solder SMD components.  Multilayer PCBs are gaining popularity in electronics because they offer double-layer PCB power in a much smaller package.

They are available in a variety of shapes and sizes, ranging from four to twelve layers, to meet the demands of their expanding uses. Since odd numbers of layers might cause problems in the circuit like warping and are not more cost-effective to fabricate, even numbers of layers are typically used. While mobile devices like smartphones typically need around twelve layers, and some reputable PCB manufacturers boast the ability to make multilayer PCBs with nearly 100 layers, the majority of applications call for between four and eight layers. Although they do exist, multilayer PCBs with that many layers are uncommon due to their extraordinary cost-efficiency.

Manufacturing of Multiple Layer PCB boards in the Factory

With a few significant exceptions, the production processes for PCBs are essentially the same for all forms of construction. These variations are related to the layup or multilayer stack up, which consists of insulation or dielectric between signal layers with etched copper traces and ground layers that are normally solid planes. The following challenges with board manufacture and PCB assembly are typical for multilayer designs: There are many suppliers of PCB makers. These suppliers made different PCBs and supplied to all over the world. Some of the Largest PCB makers you can visit here

Layer positioning

Contrary to single- and double-sided PCBAs, which typically have two or more layers to align, multilayer boards may feature stackups with dozens of layers. Placing plated through holes (PTHs) correctly is necessary for current to pass through the interior layers of the board, which necessitates precise alignment of the board layers.


The copper laminate delaminates when it separates. Surfaces or interior layers may experience this. If the board is not irreparably damaged, surface delamination can be repaired. There are more possible sites for delamination on multilayer boards. The board will most likely need to respin in this situation.

Drilling accuracy

Since numerous layers are frequently drilled at once, alignment is essential. However, compared to the interior layers, the bottom layer of these stacks typically has a larger deflection or a wider hole. This can be problematic because the larger deflection may call for a larger annular ring diameter.

Through choice

What is the finest through option for creating multilayer circuit boards is another crucial consideration. Your board build will be affected by the visa you choose. For instance, through-holes require less precision than blind and buried. For some contract manufacturers, component packages with fine pitches and via-in-pad can be challenging (CMs).

Contaminants and moisture

Contamination of any kind can be a concern for your board since it might prevent it from operating properly or cause shorts that harm the board, components, and traces. On a multilayer circuit board, moisture can be introduced in a variety of ways, making it particularly harmful. Attacking this problem during production and packing is the best way to safeguard PCBs against moisture.

Explanation of the process

The performance of electrical circuits is influenced by one of the most crucial components, the printed circuit boards (PCBs). It is necessary to comprehend PCBs’ operations as well as their manufacturing process, of course. In light of the fact that 60% of PCBs used in industrial electronic circuits are multilayered, the creation of multilayer PCBs attracts attention. The market for multilayer PCBs has been pushed by the demand for smaller, more potent, and quicker gadgets. These PCBs’ current carrying capacity is boosted by the conductor copper utilized in them. This article provides information on choosing copper multilayer PCB manufacturers as well as a discussion of the multilayer PCB manufacturing process.

Outlook of Process

Manufacturers of copper multilayer PCBs use a fairly simple manufacturing technique. The following steps are taken in the production process:

Prepreg sheets, copper (Cu) foils, and the inner layer core components are chosen.

The glass cloth and epoxy resin were used to create the prepreg sheets.

The copper (Cu) foils of a particular weight and thickness are then used to further cover the core sheet laminates.

Then, photosensitive dry films are placed on top of these laminates, allowing the UV light to touch the resist. The electronic information of the inside circuitry is transferred to the resist by using UV radiation.


While multilayer PCBs are created through multilayer lamination, this is the technique of one core laminate preparation The sequential process of PCB multilayer lamination. This means that a Cu foil sheet will serve as the layering basis, and layers of prepreg will be added on top. Depending on the operational requirements, different numbers of prepreg layers are used. The inner core is placed atop the prepared layer, which is subsequently covered with prepreg layers covered in copper foil. This multilayer PCB stack now has one lamination. Over one another, the same laminates are placed. The complete lamination stack, which is referred to as a “Book” and each laminate as a “Chapter,” is created when the last foil is attached. The book is then moved to a hydraulic press once it is finished. The heated hydraulic press applies tremendous pressure and suction to the book. The technique is known as curing because it prevents the laminates from contacting one another and enables the resin prom to prepare to combine with the core and foil. The fabrication of copper multilayer PCB is then complete once the assembly is removed and allowed to cool at ambient temperature to allow the resin to settle.

Although the majority of copper multilayer PCB producers use the same procedure, the results are not restricted to the procedure. It necessitates a rigorous focus on the small print. Partnering with the appropriate copper multilayer PCB manufacturer is so crucial.

PCB factory in China Providing a Multi-Layer PCB

A PCB factory in China is providing the best multiple-layer PCBs at very reasonable prices. This factory is capable of supplying its products to any company in the world. There are numerous factories in China and around the world that provide the best PCB boards to their customers. They have the most skilled employees, manufacture PCB boards with high-quality materials, and maintain open lines of communication with customers and suppliers. Excellent PCB suppliers have effective communication skills, which is important in understanding customer demand. By understanding the demands of customers, suppliers can provide good PCB material to customers who are demanding it. They use high-quality material for manufacturing the multiple-layer PCB board, which is water-resistant and a good conductor and insulator. They provide small multi-layer PCBs that are more efficient and powerful in small gadgets and phones. They wish to benefit modern electronics by providing a lightweight feature to multiple-layer PCB boards. They have increased the durability of multiple-layer PCB boards to handle more pressure and heat. Some of the most famous companies in China that are providing the best multiple-layer PCBs are mentioned here. These are PCBWay, A-Tech Circuits, Hitech Circuits Co., Ltd., PCBGoGo, Moki Technology, Agile Circuit, HuanYu Future Technologies, and PCBMay. These companies are PCBs makers and suppliers. You can read more about these companies.