How to Design and Recycle PCB Assembly Waste in China?

Posted on 2020-02-05

10 Awesome Things You Can Learn From Pcb Assembly manufacturing in China

Pcb assembly

Table of contents:
1.The recycling process for PCB assembly china
2.Application of MEMERCS to waste PCB assembly china boards
3.The calculation method of the new PCB assembly
4.Analysis of the metal resource of waste PCB assembly boards china
5. What are the steps involved in producing PCB?
6. What is schematic design?
7. How to create a netlist file?
8. How to learn the layout?
9.How to create a Gerber file?
10.Physical Creation of PCB assembly china


Pcb assembly china Pcb assembly china is has become the world’s largest producer of electronic parts. The amount of waste of household electric appliances and electronic devices are increasing increases worldwide. It is important to recycle useful substances from these.

However, it is economically and technically difficult to reuse all the substances. Furthermore, the environmental burden generated at the time of refining should be considered.

PCB assembly china recycling process and its environmental impact assessment 

There are some pre procedures that pcb assembly manufactures are analyzing. Similarly, there are almost no indicators that take the viewpoint of resource depletion into consideration.

This article proposes an index MERMCS (Model for Evaluating Metal Recycling Efficiency for Complex Scraps).  It considers various environmental viewpoints also. And uses it to evaluate the appropriateness of waste pcb assembly china boards. Especially; in developing countries. It is an evaluation of various recycling laws and consists of 8 chapters.


Recycling pcb assembly china

Chapter 1 is an introduction. It provides an overview of related research. Simultaneously, leading PCB assembly companies have already carried this research. Their main focus has remained the structure and recycling of PCB assembly china boards

Chapter 2 outlines the past research on metal elements.  In addition, it contains the waste of printed circuit boards and their recycling. Similarly, it describes:

  • Multi-criteria decision making
  • life cycle evaluation methods
  • describes the methods required for this article

The calculation method of the new PCB assembly


Chapter 3 describes the calculation method of the new pcb assembly china index MERMCS. It integrates an environmental impact assessment and resource depletion assessment by extra weighting.

 In addition, we can use it to analyze the following points:

  • amount of metal elements contained in waste printed circuit boards for
  • desktop PCs and mobile phones
  • the relevant indicators MRE (Material Recycling Efficiency)
  • RRE (Resource Recovery Efficiency)
  • QWERTY ( The differences from quotes for environmentally Weighted Recyclability)
  • Characteristics of MEMRECS were described.

Chapter 4 describes some typical pcb assembly china

MEMRECS calculates data using its own developed policy. It also evaluates the different environmental impacts. As a result, although the absolute value differs depending on the inventory data used. The relative value between products shows similar features. It is necessary to select an environmental impact assessment index.

Application of MEMERCS to waste pcb assembly china boards

In Chapter 5 we will apply MEMERCS to waste pcb assembly china boards. This will apply on

  • CRT-TVs
  • PC-Monitors
  • PCs
  • DVD
  • Mobile phones

As a result, when using QWERTY, there is almost no difference in the recycling method between the two companies.  Similarly, when evaluated using MEMRECS, the results show that Umicore is superior. This is due to the fact that while Umicore effectively recycles tin.

According to the analysis, the importance of recycling tin is reflected in the results.

Chapter 6 describes the recycling of metal resources from waste pcb assembly boards in developing countries. In developing countries, printed circuit boards have been manually sorted, separated and recovered. However, it brings consideration of environmental impact.

Recently, experts are using copper for precious materials.  In this chapter, its effectiveness was evaluated using MEMRECS.

As a result, recyclability depends on the concentration of gold.  It is used for waste printed circuit boards of mobile phones. Furthermore, it contains a lot of gold. But waste printed circuit boards such as CRT TVs with low gold concentration has a low rating.

Based on these results, we propose a process to recover tin. It can be manual or mechanical crushing of waste pcb assembly china. Similarly, the concentration of gold can be low too.

Analysis of the metal resource of waste PCB assembly boards china


pcb assembly boards china

Chapter 7 conducts scenario analysis on metal resources. The recovery evaluation from waste pcb assembly boards using MEMRECS, especially for China. The three scenarios evaluated were exports to China:

  • use of domestic copper smelters
  • other metal smelting processes in Japan

The result was that exports to China were the worst. And recycling in Japan was transported to Japan. The largest rating is given even when considering the environmental load.

However, the recycling of waste printed circuit boards for mobile phones with high gold content in Vietnam has received almost the same evaluation.

Chapter 8 is the conclusion, summarizing chapters 1 to 7 and then giving the conclusions. In addition, it carries information about the need to consider sensitivity analysis of resource depletion data. It could not be investigated in this article:

  • comparison with another objective
  • multi-criteria decision-making methods
  • application of MEMRECS to other than waste pcb assembly china


Q. What are the steps involved in producing PCB Assembly?

Steps in producing PCB assembly design:

Basic Steps:           

There are different steps in producing PCB assembly design most of the designs began with a symmetrical illustration.

1: The hand-drawn design is used to test and make sure if it is working right.

2: The digital design of a hand-drawn design is created using the software.

3: Then cross-connection is created between electronic schematic and software.

Pcb board manufacturer uses it to create a physical pcb assembly. All devices are managed and arranged in the latest software that can design it. This software assists in cutting and drilling the pcb. Because alignment is crucial for the perfect lining. A designer should complete the whole procedure in designing.

Major Steps:


  1. Manually designing and testing the prototype circuit.
  2. Capture the drawn illustration of the circuit using software
  3. Verify the working of the printed circuit board
  4. Do physical application using software

Printed Circuit Board

Q. What is the basic idea of PCB assembly china production?

The basic idea of developing and designing the printed circuit board is to enhance its performance according to modern equipment requirements.

Similarly, a designer selects specific components at the time while creating the PCB circuit. The next step is to verify the prototype.

PCB assembly is the substrate nearly of all electronic devices but often more convenient to build on a board designed for prototyping. Simultaneously, the schematic Capture software is also to boost the performance of a pcb in multitasking and heavy working.


Firstly rough skeletal schematic with specification was created. Then the important components are selected and all required parts were placed on board. In short, in the complete process, all devices and parts were placed adequately. As a result, both the layouts are way similar to each other.


Schematic Capture


Q. What is schematic design?

In this method, a PCB assembly china board manufacturer design all steps and techniques to manufacture a printed circuit board.


To complete the whole design, a pcb boar manufacturer should use the latest software.


It helps in telling the accurate steps to complete the pcb board schematic designing.

Q.What is the footprint?

Footprint placing tells the way to connect pads with pcb assembly board.

Q.How schematic Capture works?


schematic Capture & pcb assembly board

It can easily capture the signals and enables the designer to export files. Furthermore, it also helps to connect all pcb boards layers. This method will increase the speed of pcb board manufacturing. Furthermore, it also generates a starting point automatically.

Q. How schematic Capture work? –PCB Assembly

The Opto sensor is the best tool to capture pcb board design. For the necessary parts, the existing part libraries search first. For every component, a part symbol is needed to drill or route in layout. Such as power connection. In this certain case, the power connector is required for the Opto sensor circuit.

The Opto sensor circuit is doesn’t show in the libraries. Thus power connector was created by practicing the method given in the tutorial. The whole artwork is wired together as in the paper schematic ad placed on the drawing area.

Q: How to create a netlist file? – PCB Assembly


A netlist file is the combination of all smaller and major pcb assembly board files. It contains every kind of information. In addition, it plays a role in the connector. You can easily transfer files and store data here. It stores information about every component. The most basic purpose of the netlist file is to carry the signal of connectivity among various parts of the pcb board.

Similarly, no one wants to create a populated pcb board. Generally, the printed circuit board is the hub of many small points. In the modern era, new techniques have shortened the size of printed circuit boards. Now nest files are the best option to make pcb board working faster. There is software that can be used for data compiling: CAM. But it is not as efficient as Netlist.


2. PCB Assembly Physical layout

An arrangement of pieces of equipment in several areas is called the physical design layout. It is a simple design that conveys info to build more locks. Pcb assembly china board manufacturer also calls it to blueprint technology. To complete this task, the latest 9.0 software has been used.


Q. What is Footprints in Layout?

Footprints are fundamental parts placed in pcb assembly board. It is used during board layout where an electronic component gets soldered onto the PCB. It consists of several layers of information, including copper land, silkscreen, solder mask, and solder paste. Similarly, it contains all the physical dimensions.

PCB Assembly Interconnect

Where the copper interconnects in the circuit will be located is defined by routing. On the surface of PCB interconnects are copper paths that connect one pin to another. Interconnects are also known as “routes or traces”

PCB Assembly Layers

A pcb assembly china board comes with multilayers. Similarly, you can find a single-layer printed circuit board also. It depends on what kind of board you prefer to buy. In the modern era, multi-layer boards are famous. In addition, pcb board assembly makers also use 4 layer pcb board mostly. It provides better chances to stand against heat. Furthermore, their life service is also impeccable.


A variety of tools will be used while working with layout. The curser will perform different actions depending on the currently activated tool. All the tools may be selected at the top of the screen from the menu slide.


T is a visible simple on the top of the bar. It is used for writing text. This allows add and edit the text. Drawing and editing such as outlines are done by obstacle tools. Editing of pin connections is done by connection tools. For editing and adding, routes Showed track Mode, Edit Segment Mode is used.

Q. How to learn layout?


china Pcb assembly manufacturers

Through layout, many items help arrow learning layout a tutorial explains the basics. The troubleshooting section on the appendix of the document help to search question helps arrow help topics on the menu bar. Popular Pcb assembly china manufacturers follow the same step

When starting most physical layout the first task is to create important footprints that are not on default libraries. Please refer to “How to create footprints in Or CAD layout” for instructions. Once you create all the necessary files, the process will begin.

With the obstacle tool, the correct size of the rectangle was drawn for the board outline. After drawing board outline the component were placed and aligned. The component tool was used to edit and move. All the comments then placed inside the outline with circulatory in between the sensor r were. Place on the left side and output b and c and power supply on another end, in Opto sensor circuit. Text and drill hole maybe edit to the board at that time.


Q. What is the Gerber File?

It is a 2d image binary file. It helps in developing images on the printed circuit boards. Now, pcb board assembly manufacturers use modern Gerber file equipment. It assists in shading better images. These images provide the good results by minimizing environmental noise.

Q. How to create a Gerber file?

You need to do basic settings for making Gerber files for different layers of the pcb assembly board.

Gerber files

There are the names of five Gerber files

  1. First layer
  2. End layer
  3. The top layer of silk material screen
  4. Separate layer for drilling
  5. Outer layer for board


PCB assembly board outline is on the Gerber file is on the Global layer by default which contains the board outlines. To change the location on the GND layer the solution is to double click on the board outline. Previous input data may erase except the five. “Gerber RS 274-D” uses by default. “Extended Gerber” is the proper device.

For each Gerber file, a three-letter name is used for a descriptive name. Using property window filename also be edited. By selecting “Preview” you can also preview the file. Select “Run Batch” to create a new file.


Physical Creation of PCB assembly china

To physically create a PCB assembly all the Gerber are files are available now. The prototyping machine uses to create a Gerber file.

To create a PCB substrate quick circuit 7000 along with a prototyping system in the ECE shop and then it is solder. The maximum board size is 13”x19”. It will take two days to complete the process.

Q. What are the last steps for verification of PCB assembly china?

The board needs to verify when returned. First, the visual inspection for connection and bridges. Then use the ohmmeter to verify the connections of traces. If it displays any malfunction, relevant PCB board professionals should start diagnostics procedures.