pcb manufacturing china,multilayer pcb manufacturing

• pcb manufacturing china
• pcb manufacturing Types
• Steps of the PCB manufacturing process
• Materials needed for PCB production process
• Equipment needed for PCB production process
• PCB production process needs attention
• Precision and quality of plate making
• pcb manufacturing Why Choose Semshine
• PCB Manufacturer Capabilities

pcb manufacturing china

We have extensive experience in the manufacturing of printed circuit boards (PCBs) that are tailored to meet the diverse needs of different industries and applications. Our specialization lies in the production of a wide range of PCB types, including 1-20 layer high-density impedance, blind/buried, HDI, high frequency, high TG, aluminum, and heavy copper PCBs. These PCBs have gained widespread popularity and are extensively utilized in fields such as communication, medical equipment, consumer electronics, vehicle electronics, and more. We are dedicated to upholding the highest standards of quality and employ advanced manufacturing techniques to ensure that our PCBs adhere to the stringent requirements of these industries. By offering reliable and high-performance solutions, we aim to provide our customers with the best PCB products available.

pcb manufacturing Types

FR4 PCB
FR4 PCB, based on the FR-4 material, can be divided into several types of PCBs based on their layer configuration and construction. The common types of FR4 PCBs include:

Heavy Copper PCB
Heavy Copper PCB refers to a type of printed circuit board that features a significantly thicker copper layer compared to standard PCBs. The copper thickness in heavy copper PCBs typically ranges from 3 ounces (105 micrometers) to 20 ounces (700 micrometers) or more.

Multilayer PCBs
Multilayer PCB (Printed Circuit Board) refers to a type of PCB that consists of multiple layers of conductive traces and insulating material stacked together. Unlike single-layer or double-layer PCBs, which have only one or two layers of conductive material, multilayer PCBs provide increased design

aluminum pcb
aluminum pcb, also known as Metal Core PCB, is a type of printed circuit board that uses an aluminum base material. It possesses unique characteristics and application advantages compared to traditional substrate materials such as FR-4.

Rigid-Flex PCB
aluminum pcb, also known as Metal Core PCB, is a type of printed circuit board that uses an aluminum base material. It possesses unique characteristics and application advantages compared to traditional substrate materials such as FR-4. The structure of an aluminum pcb typically consists of the fol

HDI PCB
HDI PCBs are a type of multilayer PCB that utilizes advanced technologies to achieve higher circuit density and miniaturization. They incorporate microvias and high-density routing to accommodate complex and densely packed components.

Steps of the PCB manufacturing process

PCB production process mainly includes design, graphic conversion, plate making, etching, drilling, coating, welding, testing and cleaning steps.

Design phase

The design stage is the starting point of PCB production, and the circuit schematic and PCB layout are designed through CAD software to determine the size of the PCB board, the routing method, the size of the pad and other information.

Graphic conversion phase

After the design is completed, the circuit schematics and PCB layout diagrams need to be converted into Gerber files for processes such as plate making and etching.

Plate making stage

Plate making is the core link in PCB production, by converting the Gerber file into a photoresist film, and then through exposure, development and other processes to transfer the photoresist film graphics to the copper foil, to make the PCB board line and graphics.

Etching stage

Etching is the process of removing the unnecessary copper foil part, by soaking the copper foil after plate making in the etching agent, waiting for a certain time, the excess copper foil is etched away, forming the PCB circuit and graphics.

Drilling stage

Drilling refers to drilling a variety of holes on the PCB board, including pad holes, positioning holes, installation holes, and so on. Drilling requires the use of a drill press or drill machine to operate.

Coating stage

Coating is to remove the photoresist film on the copper-clad plate, and then cover a layer of welding film through the process of drying, exposure, etc., in order to carry out subsequent welding operations.

Welding phase

Welding is the process of installing components to the PCB board and welding them. Soldering iron or welding equipment is required during the welding process.

Detection phase

Inspection is the process of quality inspection of welded PCB board, mainly including AOI inspection, X-ray inspection, ICT inspection and so on.

Cleaning phase

Cleaning is the process of cleaning the welded PCB board for subsequent packaging and assembly operations.

Materials needed for PCB production process

The materials needed in the PCB production process mainly include copper foil, photoresist film, corrosion agent, welding film, components and so on. Among them, copper foil is the basic material of the PCB board, the photoresist film is used to make the graphics and lines of the PCB board, the corrosion agent is used to etch away the excess copper foil, the welding film is used to protect the PCB board and the welding pad, and the components are an important part of the PCB board.

Equipment needed for PCB production process

The equipment needed in the PCB production process mainly includes platemaking machine, etching machine, drilling machine, coating machine, welding equipment, testing equipment, cleaning equipment and so on. Among them, platemaking machine is used to make photoresist film, etching machine is used to etch off excess copper foil, drilling machine is used to drill, coating machine is used to cover welding film, welding equipment is used to install and weld components, testing equipment is used to detect PCB board quality, cleaning equipment is used to clean the welded PCB board.

PCB production process needs attention

Accuracy of design documents

The success of PCB production is related to the accuracy of the design file, so it is necessary to be as accurate as possible when designing the PCB board, and to verify and modify it many times.

Precision and quality of plate making

Plate making is the core link of PCB production, and its accuracy and quality directly affect the quality and stability of PCB board. Therefore, the plate making process requires fine operation and control to ensure the accuracy and quality of plate making.

Etching control

Etching is one of the key links in PCB production, and it is necessary to control the parameters of etching time, temperature, concentration and so on to avoid incomplete etching or excessive etching.

Quality of welding

Welding is one of the important links of PCB production, it is necessary to control the temperature, time, pressure and other parameters of welding to ensure the quality of welding and avoid problems such as weak welding or short circuit of the pad.

 Thoroughness of cleaning

Cleaning is the last link in PCB production, it is necessary to ensure the thoroughness of cleaning, avoid leaving residue or water stains, affecting the quality and stability of the PCB board.

 Perform safe operations

PCB production involves a variety of chemicals and equipment, and requires safe operation to ensure the safety and health of operators.

pcb manufacturing Why Choose Semshine

Supplier Evaluation
All of our suppliers have been screened and approved by our evaluation team and have extensive experience in the pcb field. Besides, we have passed ISO9001:2015, UL, ROHS to ensure high quality supply.

Pre-production Arrangement
The engineer checks the customer's design information, makes the production documents twice and is confirmed by the customer.

Control in Manufacturing
The factory has advanced automatic production line which reduces manual damage to boards.

Test of finish product
-Open/short, visual inspection and physical testing.
-Flying probe,ICT,and functional testing.

Delivery
Before delivery, the item number, customer code, quantity and consignee etc must be fully checked by the PQA.
Customer service
A special customer service team contacts customer, offers quick response and provides return and refund service.

PCB Manufacturer Capabilities

Category	Description	Capability
File Formats	Gerber files- preferred	Gerber file 274-X or ODB++
	Drill file	3.3  leading  mm
Size	Max. finished PCB dimensions	400mm x 1200mm – Single/ Double-sided
		600mm x 700mm – Multilayer
Board Thickness	Standard	1.6mm ±10%
	Min.	0.6mm ±10%
	Max.	3.2mm ±10%
	Bow and twist	0.50%
Copper Thickness	Outer Cu weight	0.5oz-12oz
	Inner Cu weight	0.5oz-12oz
Laminate Materials	FR4(KB, ILM, Shengyi, Huazheng new material ) ,    High TG, Aluminum plate( Taiwan)
Board Cutting	Max. number of layers	20
	Min. thickness for inner layers (Cu thickness are    excluded)	0.05mm
Drilling	Min. size	0.20mm
	Max. size	6.00mm
	Drill Deviation	±0.075mm
	NPTH hole tolerance	±0.05mm
	Angle of Countersink	45°
PTH	Min. hole size	0.20mm
	Aspect ratio	8:1
Etching	Trace width tolerance	±20%
	Min. trace width / space (1oz finished Cu weight starting from 1/3oz)	75um/75um  (3mil/3mil)
	Min. trace width / space  (1oz finished Cu weight starting from 1/2oz)	89um/89um  (3.5mil/3.5mmil)
	Min. trace width / space (2oz finished Cu weight)	150um/150um  (6mil/6mil)
Solder Mask	Color	Green,White,Black,Red,Blue,Etc.
	Min. solder mask clearance	3mil
	Thickness	Line angle:8um(min),Linear plane:10um(min),    base material:20-50um
Silkscreen	Color	White,Black,Etc.
	Min. trace width	100um 4mil
	Min. size	0.7mm 28mil
Test	AOI	100%
	Flying Probe Tester	Sample 100%
	E-test	Mass order 100%
Controlled Impedance	Tolerance	+/-10%
	Impedance tester	Test impedance module
Profile	Tolerance	±0.10mm
	V—CUT Depth	±0.10mm
	V—CUT angle deviation	30°
	Semi-hole	Minimum half hole:0.40mm
Surface Finish	HASL,Immersion gold(ENIG),OSP