Thursday, November 28, 2013

Printed Circuit Board (PCB) Blanking

According to PCB material, hole and shape processing can adopt the method of mould cutting, to a simple PCB processing or request is not high PCB can be used in a cutting way.Suitable for low level and the requirements of the mass is not very high PCB PCB production and appearance requirements is not very high, the cost is low.


Production batch is big, the amount and type of hole and more complicated shape of single-sided paper substrate and non-metallic hole of epoxy glass cloth substrate double-sided, usually USES one or a few pay mold punching.


PCB production batch of the appearance of single panel and double panel, usually USES the mould .According to the size of the PCB, can be divided into the blanking die and whereabouts is expected to die.

The composite processing:

PCB hole and hole, hole and shape between the requirement of high precision, at the same time in order to shorten the manufacturing cycle, increase productivity, the composite mould machining hole and the appearance of the single panel at the same time.

With mold processing, PCB, the key is to mold design, processing, need professional knowledge, in addition to this, the mould installation and debugging is also very important, at present most of the PCB factory molds are made outside the factory processing.

Mould installation considerations:

1. According to the mold design and calculation of blanking force, the size of the mould, such as height choose punch (including type, tonnage).
2. Start the punch press, comprehensive review include the clutch, brake, slider, etc. Each part is normal, whether the operating mechanism and reliable, and should have no impact phenomena.
3. Die under the pad iron, generally is 2 pieces, must on the grinding machine grinding out at the same time, to ensure that the mold installation parallel and vertical.Shim placed leap put namely don't hamper blanking and near the center of the mould, as far as possible, at the same time.
4. To prepare a few sets of platen and T head clamp screw, so that the corresponding use and die.Linking piece without touching lower die straight front wall.The interface between should pad cloth, must tighten the screw.
5. Be very careful when mould installation on the screw, nut don't meet lower die mould (upper die down, closed).
6. Adjust the mould using hand as much as possible, instead of motor.
7. To improve the cutting performance of base material, paper board to be hot.The temperature at 70 ~ 70 ℃.
Die cutting of the PCB hole and shape, its quality defect has the following several:

Around the hole of the bump or copper foil case become warped or layers;Between holes and hole crack;Partial or hole itself is not a vertical hole position;Burr;The section coarse;Coining the PCB into the bottom of the pot shape warping;Waste jumping;Waste blocked.

The check analysis steps are as follows:

Check if the punch blanking force, rigid enough;Mold design is reasonable, whether rigid enough;The convex and concave die and machining precision of the guide pin, guide sleeve, if, if installation concentric, vertical.Fit clearance is uniform.Convex and concave of the gap is too small or too metropolitan produce quality defects, is a mold design, processing, and debugging, using one of the most important question.Don't allow the rounded edge convex and concave die, chamfering .Taper is not permitted in punch, especially when punching both positive cone and cone are not allowed.In production to pay attention to whether convex and concave die blade wear at any time.The discharging mouth is reasonable, small resistance.Pushing plate, a feed rod is reasonable, strength enough.Washed the plate thickness and the substrate binding force, the gel content, and the adhesion strength of the copper foil, to hot humidity and time is also cutting quality defects such as analysis of factors to consider.

Mr. Sam Duan

Sunday, November 24, 2013

Something About the Flexible Print Circuit Board(FPCB) You Should To Know

FPCB, all known Flexible Print circuit board or Flex Print circuit Board, it is attached to the flexible substrate on the dry film, exposed, developed, produced on the substrate after etching conduction lines. In terms of its relative rigid printed circuit boards can be curved flexible, smaller and lighter. In electronic products play a role in conducting and bridges make the product better performance, smaller.

Main material: polyimide + adhesive + copper are also non-adhesive backing, which only copper + substrate, its price is higher, less in the current application, unless special needs.

Copper CU (Copper Foil) in the material is divided into rolled copper RA (ROLLED ANNEAL Copper Foil) and electrolytic copper ED (ELECTRO DEPOSITED Copper Foil) two kinds, the characteristics of the mechanical properties of rolled copper is better, there are scratch off most requests are made rolled copper. Thickness is divided into 1/2oz (0.7mil), 1oz, 2oz, three are generally used 1oz.

Substrate in the material is divided into PI (Polyimide) Film and PET (Polyester) Pilm two kinds, PI's price is higher but its better flame resistance, PET lower prices but not heat. So if it needs most are made of welded PI Material thickness is divided into two kinds of 1mil 2mil.

Reinforcing material Stiffener soft board soldered parts or local area in order to increase reinforcement in order to install and another pressing up of hard material reinforced PI and PET film is divided into two kinds of materials as Epoxy FR4 material commonly known as urea resin plate reinforcement materials in general are feeling Caulking RESSURE SENSITIVE ADHESIVE fit with soft board, but you are using PI reinforcement film adhesive (Thermosetting) lamination.

Surface treatment

1. Rust treatment - on the surface of bare copper antioxidants
2. Tin-lead printing - the bare copper surface with solder paste printing another reflow furnace
3. Plating - Plating Tin / lead (Sn / Pb) nickel / gold (Ni / Au)
4. Chemical deposition - chemical solution deposition way to tin / lead nickel / gold surface treatment


Can be curved flexible, small footprint, light weight, stable transmission characteristics, sealing, insulation, good assembly process

Application areas:

Automation instrumentation, office equipment, communications equipment, automotive instrumentation, aerospace instrument, cameras and other PCB board .


(1)According to sub-layers: * Single Layer board * Double layer board * Multilayer board (two or more layers)
(2) By material: * Soft board * Rigid PCB board * Rigid-Flex PCB board

Tuesday, November 19, 2013

Some Knowledge About PCB Board Panelization

A key to saving money on PCB manufacturing during the design phase is to optimize the usable area available for each standard manufacturing panel.

Some manufacturers suggest that you put a number of different circuits on the same panel to improve material utilization and reduce manufacturing costs. At wonderful PCB Limited, we do this automatically as part of our pooling process, so there is no need for you to waste valuable design time. Of course you can suggest us your idea of panel size.

Penalization will do much help for the assembly process. If your layout uses SMD components we automatically panelized a solder-paste layer which you can download as a Gerber file for stencil manufacture. We can generate the paste files from the SMD pads on a "best-efforts" basis but it is not always clear to us which pads to include and which to leave out. So we recommend that you check these files before you use them. It is much safer to generate a paste file yourself and include it in the data you send us. We will then check it with the rest of the data and step and repeat it into the same assembly panel.

There are several ways to panelization of the PCB boards. Normally by V-cut, stamp hole and routing. No matter what kind of method you want, we can make it for you. And we can offer you the best solution. Manufactur ability rules: (1) Minimum dimension of the single PCB is 5 by 5 mm. (2) Maximum panel dimensions on the Verified and Verified Plus service is 250 x 350 mm.

Here are some of the PCB boards that in Panel for your reference.
First one is by V-cut and routing, the second is by stamp hole.

Monday, November 18, 2013

Introduction On Tin paste For PCB assembly

Tin paste perform a very important role during PCB assembly, and it is indispensable for assembly. This is why I have to introduce it, today I mainly want to show some pictures on Tin painting and ICT test.

Schematic plot on tin paintingscraper type )

Schematic plot on tin paintingextrusion type scraper )

Schematic plot for ICT test probe to component

In next chapter, I will introduce what is tin. For more information, pls enter

Monday, November 11, 2013

PCB Layer Definition

For the base skills for PCB board engineer is to know the PCB terms, especially for each layer, each hole, each unit, etc. In the EDA software terminology, there are a lot of terms is not have the same definition. The following could explain the different in literally meaning, which may help the unprofessional person to better understanding and learning the necessary terms.

Mechnical: generally refers to the type plate machining dimension layer

Keep out layer: definition cannot go line, perforation (via) or parts area. These limits can separate definitions.

Top overlay: can't literally know its meaning. To provide more information to further discussion.

Bottom overlay: can't literally know its meaning. Can provide more information for further discussion.

Exposed Top paste: top need copper on a part of the solder paste.

Bottom paste: need to show on the copper solder paste at the bottom of the part.

Top solder: shall mean the top resistance welding layer, to avoid in the process of manufacturing or in the future maintenance may not be short circuit

Bottom solder:Should refer to the underlying resistance welding layer.

Drill guide: it could be different aperture size, the corresponding symbol, and the number of a table.

Drill drawing: refers to the hole of the bitmap, different aperture will have a corresponding symbol.

Multilayer: there should be no separate this layer, can refer to a Multilayer, in view of the single panel and double panel.

Top paste: namely the surface patch when open stencil to use.

Bottom paste: that is the underlying patch when open stencil to use

Thursday, November 7, 2013

Anti-pollution Measures On PCB Fabrication

Nowadays, the pollution from PCB fabrication has drawn great public attention. The environmental pollution of PCB fabrication is mainly in the forms of waste water, exhaust gas, waste residue and so on. In most of the European countries, they have strict policy to control the pollution from PCB fabrication. While in China the pollution becomes more and more serious due too many PCB manufacturers and the control is not enough. In the future, the PCB fabrication will gradually move towards clean production sustainable development.

Firstly, the government must establish relevant laws and regulations to guide and control enterprise behavior, so as to save resources and improve resource utilization and reuse rate. Secondly, the PCB corporations that are not equipped with waste water treatment facilities or equipped with unqualified facilities waste water treatment should not continue the PCB fabrication any longer, completely changing the situation of observing the low at high cost and breaking the law at low cost .

Secondly, the PCB fabricators in China should establish good sense of environmental protection. During the PCB production, should follow ISO9001 and ISO14001 standard. The waste water should be well controlled. As long as the relevant government departments and PCB related industries cling together and formulate measures and systems in line with the national condition of PCB industry development in China, the pollution caused by PCB fabrication will go down substantially, even to meet the clean production requirement for sustainable development. As a manufacturer,

As a Leading PCB fabricator in China, Wonderful PCB shared our responsibility to protect the environment. Always bear in mind that production should follow the industry standards.

The Canada Carmaker's Visited Our Company Wonderful PCB Limited

Today is Friday; our Canada customer visited our factory. CANWAN is a big TV VA supplier at Canada , IRAN and Thailand. Wonderful PCB is the best PCB manufactory in China. Wonderful PCB with automated production and data networks -this is our forte. Specimen printed circuit board and mini-series in express service. Our overseas marketing office is located in Hong Kong mainly for overseas communications/contacts, engineering works handing orders and goods delivery/exports. Our company PCB products widely used in communication medical, industrial control household appliances, etc; the products are mainly exported to Europe and America. Southeast Asia and Asia.

At present, production capacity of Wonderful PCB reaches 15,000 M² / month with 400 operators. Wuhan new plant output over 30,000 M² / month estimate 600 operators.
Our environmental green boards produces single side, double side, multi-layers up to 14-layer on all series rigid board including high frequency board, BGA board and blind via board.

WDF managing new style of real capital employed Japanese quality team focus on quality supply chain. All our customers are long-term and continual development build begins from prototype to long term cooperation partnership.

Since develop from the past years, we are supplying green products measuring up to the standard of EU by Rosh and UL. WDF already certificated TS16949, ISO9001, ISO14001, SA8000 and Sony Green partner. Our PCB boards using on automotive, industrial, automation, aero plane to mature international business on U.S, Europe and Asia countries.

After years developing, WDF already being reliable green partner with stable annual growths of world famous brands like VW, Ford, Visteon, Sony, NEC and Delphi etc...

From continuous improvement strategies WDF established new advanced technology plant in Wuhan on 2013. WDF producing high quality, environmental friendly and stable lead time PCB boards definitely first choice of your ideal partner.
WDF Business Principle
We are production base aim to service our customer as a modern high technology company.
Intensive customer service is our base for entrepreneurship.
We must use creatively mind to work-smart.
We’re pursuing distinguished attitudes and will never stop to do better.

Wednesday, November 6, 2013

 2013 Asia World-Expo, Hong Kong--Wonderful PCB(HK)Limited

Oct.12-15th,2013 Asia World-Expo, Hong Kong

Wonderful PCB is a professional manufacturer company of printed circuit board. Been in line time more than 16 years experience in PCB & PCBA. Founded in 1996, Founded in Hong Kong in 2002 Wonderful PCB (HK) Limited by the end of 2007 by total assets of nearly 100 million Yuan. Nearly 20,000 square meters, the workshop area more than 700 employees, 40,000 sq/design production capacity.

Wonderful PCB with versatile production technologies! Rigid Printed Circuit Board with single sided, 2 Layers PCB, 4 Layers PCB, 6 Layers PCB, 8 Layers PCB, 16 Layers PCB 20 Layers PCB. Flexible Printed Circuit Board with single layer, 2 layers, and 4 layers.

Wonderful PCB Assembly based product manufacturing a wide range of assemblies, from single PCB assemblies to PCBA integrated into box-build enclosures. We support high and low-mix PCB for volumes that range from a few to a few thousand.

Wonderful PCB with automated production and data networks -this is our forte. Specimen printed circuit board and mini-series in express service. Our overseas marketing office is located in Hong Kong mainly for overseas communications/contacts, engineering works handing orders and goods delivery/exports. Our company products widely used in communication medical, industrial control household appliances, etc; the products are mainly exported to Europe and America. Southeast Asia and Asia.

Wonderful PCB in our job engineering and production planning! Films, data carriers or remote data transfer -we can adjust flexibly to all your needs. Rapid, rational processing of your orders. This reduces delivery times so that you can have your printed circuit boards at an earlier date.

We supply PCB Prototype & Mass production with good price and high quality.              
All the PCB is reaching IPC II Standard.                                        

In as much as Wonderful PCB has no control over the use to which others may put the material, each user of the material is not released of making his own tests to determine the material’s suitability for his own particular use. Statements concerning possible or suggested uses of the materials described herein are not be construed as constituting a license under any Wonderful PCB patent application covering such use or as recommendations for use of such materials in the infringement of any patent.

Lamination assist had Kraft press pad, silicon rubber press pad, Teflon release film, pressure revealing films. With the description of provide uniform cushioning and precise control over heat rise and long life (up to 150 uses) and faster lay-up. Put talcum powder before use.

Our pressure revealing film is a unique analytical tool. Provides a quick, easy and accurate in-house procedure for checking for “high” and “low” pressure zones due to press platen misalignments or the design configuration (pads, high density circuitry, ground planes, etc.) of the circuit board itself.

Welcome to our trading shows: 

Booth: 70206, CES  2014  Jan,8th-11th in Las Vegas, USA 

Tuesday, November 5, 2013

Introduction On PCB assembly Process

There are two process for manufacturer to do PCB assembly.
Below picture show control base plate(PCBA) exist everywhere in our house appliances.

Process of PCB assembly fabrication
(1) . Traditional DIP process
(2) . SMT process

Here first is the introduction of the process of DIP today.
1 . Traditional DIP process to PCB assembly means inserting the parts which with leg into the PTH hole of PCB.
2 . And then pass the PCB through tin soldering machine, to reach the purpose of soldering tin.                              

The structure of tin soldering machine

The structure of flux tank

The function of foamed pipe in flux tank
1. To air through the tiny holes on the foam tube body, causing numerous of air bubbles, with the number of air bubbles to cleave with flux, by metal accumulation, contact from the bottom of the base board and achieve the function of the flux coating, and then extra flux be strike off by air knife, and make flux distributed uniformly at the bottom of the base plate.

Method of flux coating
1. Bubble type flux coating
2. Wave type flux coating
3. Spray type flux coating

For more information, welcome

Sunday, November 3, 2013

Something About Visit Our Company Arrangement

Every customer to visit our company-Wonderful PCB Limited, hope we can focus on its immediate needs, can get warm reception, we as a salesman, want to in the process of reception customer, showing a good service skills, must be to do a good job of preparation in advance.

1. We should discuss details information from your customer.
You should tell you company address and your phone number. Because some customers not only to visit a company, convenient customer travel arrangements, the nearest airport to our company, our side of the weather.
2. Time, This is for the customer to the company's specific time.
3. The itinerary. Some customers from abroad by plane to Shenzhen, directly to visit our company, some customers to China later, first to visit other company, to visit our company, after some customers to visit our company, the next destination is where, these we all want to know to the customer, because the shuttle customers close contact with us.
4. The number. Tell visit your phone number and your company address.
5. Understand customers. Customers to the company visit must be interested in our PCB board products, we also have a certain understanding to the client, such as the customer is interested in which of our products, as well as the customer's company name, country, contact, specific visit time, number, scheduling, write a report to sales manager.
6. You should arrange hotel.
7. And cooperate with other departments. Generally when we handed the report to sales manager, sales manager will tell the production manager have client visit the date, the production manager will inform the workshop director, pay attention to all aspects of the work do a good job in workshop.
8. Understand customer preferences. Know about the customs of the country, customer's taboo, and diet.
9. The flight number, the plane arrived time and customers in China mobile phone. Understand customers arrive to the customer's flight number, or the customer requires us to pick up location
It is our great honor that you could visit and discuss details 9/9(Monday)

For our meeting we will discuss below:

A, Pick you up from your hotel to our office, have a comfortable meeting and we will introduce our company, know more about us. (9:00am start, assume 30mins)

B, Visit our factory, we introduce  PCB board processes, capability, equipment and so on. (2 hours)
C, Have a meeting to discuss details of your projects, prices, shipping details and so on. (1 hour)

D, Have lunch together if you are available (1hour)
E, Drive you back to hotel