Category: Article

BOARD HANDLING SYSTEM

I’d like to announce that we’ve added a new section to our website called " Board Handling System " in product category.
Over the years, customers have asked us how they can know specifically about Board Handling System Machines so that they’re as simple for Southern Machinery to provide them specific machines as possible according to the clients requirement and specifications. A lot of questions revolve around how these machines are operated, what are the specifications, what machine can be best fitted for their companies etc. So the very first and few products we put together is called "Board Handling System “which can be found here.
We’ll try to update this page whenever we find customers asking us such questions regularly. If you have a question about what specific machines are your requirements, how to get maximum ROI, how to handle and fix your problems of your smt/tht machines etc. please get in touch. We’re happy to help.

STRIVING FOR EXCELLENCE AND EVERYTHING WE SAY AND DO

Southern Machinery is affianced in supplying a wide range of PCB Assembly Equipments/Conveyors that is fabricated using high grade material, procured from quality conscious vendors. We are continually reinvests in the very latest technology and equipment based on customer demands and industry trends. Our Machines are widely acclaimed for easy adjustment, Low maintenance and high operational efficiency.

SOUTHERN MACHINEY SALES AND SERVICES COMPANY :

· SMT/THT MACHINES PRODUCTION & SPARE PARTS
· TIME CRITICAL PRODUCTION
· COMMITMENT TO CUSTOMER SERVICE
· BEST QUALITY AND DELIVERY PERFORMANCE
· FAIR AND COMPETITIVE PRICING/COST
· RAPID RESPONSE TO QUOTE REQUEST
· ONLINE SUPPORT PROGRAM
· TRAINING PROGRAMS
· FLEXIBILITY
SCHEDULING
· STOCK/ INVENTORY PROGRAM

TO INQUIRY ABOUT SMT / THT / AUTOMATIC LEAD PICK AND PLACE / INSERTION MACHINES AND UIC,TDK, PANASONIC, SCIENCGO SPARE PARTS, REMEMBER SHENZHEN SOUTHERN MACHINERY SALES AND SERVICES COMPANY – A LEADING NAME IN SMT/THT MACHINES PROVIDER WORLDWIDE.

Southern Machinery Sales and Services Company provide and support a large number of SMT /THT & Auto Insertion Machines models. Since with the day to day development of technology and with the passage of time new machines are coming to market that will need to be supported in the future.

I would like to ask for your input on new machines or technologies that you are considering or have already committed to in your facilities.

Are you looking for higher feeder capacity machines to reduce the changeover time from product to product or group to group? Are you looking for a surface mount technology one stop solution line which provides you $50k per month and mix production on monthly basis? Are you still using old technological Surface mount Technology machines?

Southern Machinery provides many different types of products, especially across different types of machines, then please let me know also as we have solutions for these challenges too. To know more please click.

http://www.smthelp.net/advanced-pcb-assembly-machines-and-spare-parts/

http://www.smthelp.net/smt-high-quality-automatic-dip-soldering-machine/

http://www.smthelp.net/benefits-of-smt-tht-pcba-manual-to-auto-insertion/

AN OVERVIEW OF THE PCBA PRACTICE INVOLVED IN SMT BOARD,
USING PICK AND PLACE TECHNIQUES

Within a printed circuit board electronics assembly / production or manufacturing process, there are a number of individual stages. However it is necessary for them all to work together to form an integrated overall process. Each stage of assembly and production must be compatible with the next, and there must be feedback from the output to the input to ensure that the highest quality is maintained. In this way any problems are detected quickly and the process can be adjusted accordingly.

PCBA PRACTICE OVERVIEW

The various stages in the PCB assembly process including adding solder paste to the board, pick and place of the components, soldering, inspection and test. All these processes are required, and need to be monitored to ensure that product of the highest quality is produced. The PCB assembly process described below assumes that surface mount components are being used as virtually all PCB assembly these days uses surface mount technology.

Solder paste: Prior to the addition of the components to a board, solder paste needs to be added to those areas of the board where solder is required. Typically these are as are the component pads. This is achieved using a solder screen.

The solder paste is a paste of small grains of solder mixed with flux. This can be deposited into place in a process that is very similar to some printing processes.

Using the solder screen, placed directly onto the board and registered in the correct position , a runner is moved across the screen squeezing a small mount of solder paste through the holes in the screen and onto the board. As the solder screen has been generated from the printed circuit board files, it has holes on the positions of the solder pads, and in this way solder is deposited only on the solder pads.

The amount of solder that is deposited must be controlled to ensure the resulting joints have the right amount of solder.

Pick and place: During this part of the assembly process, the board with the added solder paste is then passed into the pick and place process. Here a machine loaded with reels of components picks the components from the reels or other dispensers and places them onto the correct position on the board.

The components placed onto the board are held in place by the tension of the solder paste. This is sufficient to keep them in place provided that the board is not jolted.

In some assembly processes, the pick and place machines add small dots of glue to secure the components to the board. However this is normally done only if the board is to be wave soldered. The disadvantage of the process is that any repair is made far more difficult by the presence of the glue, although some glues are designed to degrade during the soldering process.

The position and component information required to programme the pick and place machine is derived from the printed circuit board design information. This enables the pick and place programming to be considerably simplified.

Soldering: Once the components have been added to the board, the next stage of the assembly, production process is to pass it through the soldering machine. Although some boards may be passed through a wave soldering machine, this process is not widely used for surface mount components these days. If wave soldering is used, then solder paste is not added to the board as the solder is provided by the wave soldering machine. Rather than using wave soldering, reflow soldering techniques are used more widely.

Inspection: When the boards have been passed through the soldering process they are often inspected. Manual inspection is not an option for surface mount boards employing a hundred or more components. Instead automatic optical inspection is a far more viable solution. Machines are available that are able to inspect boards and detect poor joints, misplaced components, and under some instances the wrong component.

Test: It is necessary to test electronic products before they leave the factory. There are several ways in which they may be tested. To know others methods , consult to our Engineering department.

Feedback: To ensure that the manufacturing process is running satisfactorily, it is necessary to monitor the outputs. This is achieved by investigating any failures that are detected. The ideal place is at the optical inspection stage as this generally occurs immediately after the soldering stage. This means that process defects can be detected quickly and rectified before too many boards are built with the same problem.

As a final point

The PCB assembly process for the manufacture of loaded printed circuit boards has been considerably simplified in this overview. The PCB assembly and production processes are generally optimized to ensure very low levels of defects and in this way produce the highest quality product. In view of the number of components and solder joints in today’s products, and the very high demands placed on quality, the operation of this process is critical to the success of the products that are manufactured.

TO INQUIRY ABOUT SMT / THT / AUTOMATIC LEAD PICK AND PLACE / INSERTION MACHINES AND UIC,TDK, PANASONIC, SCIENCGO SPARE PARTS, REMEMBER SHENZHEN SOUTHERN MACHINERY SALES AND SERVICES COMPANY – A LEADING NAME IN SMT/THT MACHINES IN WORLDWIDE.

MECHANICAL DESIGN OF THREE AXIS MOTION (SMT PICK AND PLACE ASSEMBLY)

· SCARA ROBOTIC ARM.

In SCARA robotic arm the robotic arm is used for the placements of the SMT components. Picture shows a robotic arm pick and place machine.

· 3-Axis movement machine.

In 3-axis machine a nozzle is attached to a plotter-like device to allow the nozzle head to be accurately manipulated in three dimensions. Additionally, nozzle can
be rotated independently. Figure 2.3 shown a belt driven 3-Axis pick and place machine. In some machines lead screws are also used instead of belts.

Limitations

The length and breadth of the machine is limited due to the bending of the rail rods. The rods get deflected due to the weight of head (pick and place nozzle assembly). When the length and breadth of the machine is increased the deflection of the structure in downward direction also increases. Therefore they are not increased beyond a certain limit. For the same reason, the diameter of the rail rods is also kept at a certain value and is not decreased as for larger diameter of the rods weight also increases.

We choose belt driven mechanism to drive movement of assembly. Belt greatly increases the speed of the machine but it decreases its precision. Increasing the diameter of the pulleys do increases the speed of the machine but it decreases its precision. Due to this reason, the diameter of the driving pulleys is also kept small.

Head (Pick and Place Assembly)
It is most vital part of Pick and Place machine from speed and accuracy prospect. Speed of machine is in direct relation with the speed of head. It is actually speed with which machine can pick and place components and it is usually measured in parts per hours (PPH).

1. Types

Pick and Place heads can be classified on the basis of following factor,

1. Number of nozzles on head

Most industrial machine has several nozzles on head. They pick up several components during pick up run and place these components during place run. In some kinds of machines components are feed into multiple heads (like bullets in a chamber), these components are then fired one by one on PCB. Picture below shows commercial multiple nozzle head.

2. Speed

Speed can be increased by multiple factor by using multiple heads on a single machine or multiple nozzles on single head. Small projects or research based Pick and Place machines usually have single head with single nozzle. These machines have speed around 1000pph to 4000pph.

Drive mechanism(motor driven or pneumatic driven)

Most common mechanism for driving head up and down is motor driven. Motor can be connected to lead screw system to drive nozzle up and down. In order to attain high speed belt driven system is used. picture shows a pneumatic driven head.

Many industrial Pick and Place machines use pneumatic drives to move nozzles up and down. Selection of drive mechanism depends on availability and price of component. In our machine we will be using motion based on belt driven mechanism due to the low price of DC servo motor and ease of control.

Features

Common features that typical Pick and Place head have are:
· Shock absorption
· 180 degree component rotation angle Controlled suction
· Small pick place transient overshoots

1. Limitations

Most prominent limitations on Pick and Place head design are:

Maximum size of head

Increasing the size of head decreases the work area for Pick and Place machine. Small head causes the designer to compromise on many quality factors. Designers are carved to use small low torque motors, small diameter guiding rods and small number of linear bearings.

Maximum speed of head

Increasing the speed to pick and place components cause the danger of dropping the component from vacuum nozzle. Head need a minimum amount of time for settling before pulling up and putting down component. Also heads speed is limited by control speed of vacuum pump and time delay of image processing processor

1. Important Considerations

Shock Absorbing

There is always risk of slight shock to the nozzle while picking or placing components on PCB. These shocks if not avoided can cause nozzle to bent from top causing uneven suction distribution over component surface. This uneven distribution of suction will cause frequent dropping of SMT components.

b. Nozzle Changer

SMT components are available in different sizes. Same nozzle cannot be used to pick and place SMT components of different sizes. Nozzles of specific gauge are used to pick place components of different sizes. In order to cope with this limitation head needs to be designed such that nozzles can be changed either manually or automatically

c. Availability of Nozzles

There is a large industry dealing with manufacturing nozzles for Pick and Place machines. These companies make nozzles for almost every type of component. But because of non-availability of nozzles in our region, nozzles are needed to be fabricated.

Feeders

As SMDs are itself special components because of their size and packing. So getting these component ready to be picked needs special devices called as feeders. Feeders are specially designed to feed the components to the machine.

Tape Feeders

These are specially designed feeders for the components packed in the form of long tapes. Following online links were examined:
Tapes are such that they have holes on their side. These holes are of standard size and are distant equally. As the figure 2.6 below shows the driving gear for the tape for its motion on the feeder as the gear moves it pulls the tape with its teeth.

Consulting patent[6] of different feeders we see they are mostly belt driven with driving element i.e. motor on side and driver on the other end. Figure 2.7 shows the gear for reel movement at 55 and being driven by 57 at the other end which can be driven by a motor.

From the complexity of feeders coping with tapes inside them was bit difficult to design so the having the tape completely isolated from the inside of feeder was considered most practical design.
As components are covered with protective tape on the top so this tape should be removed before component could be accessed. For this following simple design figure 2.8 below was considered. It is a commercial feeder by PCB unlimited for SMT components. It shows the tape removing pulley at the top and main components being moved forward.
For the position of each feeder on the machine we considered a product by LPKF called proto place. It is a semi-automatic machine for SMT components pick and place as shown in picture.

Proposed Specs of Machine

For any type of SMT/THT specification of Machine according to your requirements and Company setup, Please consult to our Engineering department at Shenzhen Southern machinery Sales and Services Co; Ltd.

AUTO COMPONENTS INSERTION / PLACEMENT SYSTEM

Efforts to automate PCB assembly (stuffing) have progressed from hand-formed components leads and manual insertion guided by blueprint. On up to fully automatic component insertion machines. The present state of the art involves either islands of automation (group of machines) bridged by sophisticated material handling. Or an array of machine setup for continuous in line assembly. All types of components are now being sequentially inserted, including axial, radial, DIP, surface –Mount (lead-less) and odd shaped components, the latter via special robotics.

Benefits of Automation

Full automation of the component insertion/ placement operation provides the user with benefits such as :

· Consistency of products quality and quantity
· Automatic inventory tracking

Additional benefits grained from these factors include reduced labor cost , Reduced reworks and an improvement in production process.
Automatic component insertion system offer a consistent production volume, and by using on-line test and verification system, allow the user to control the quality of output “Automated system are usually justified on this basis”
Speed and quality are therefore considered the most important benefits offered by both automatic insertion of leaded components are surface- mount placement system.

Recent Improvements

Automated board handing a wider range of insert able components and the increased availability of surface –mount pick-and-place system represent the most significant recent advances in PCB assembly technology. Surface mount system are now offered over a broad price range and performance capability, from the large, high volume systems costing from $ 400,000 to $850,000 depending upon options, to medium- volume systems, and on down to lower- volume units. Some of the larger surface – mount systems have been imported to provide a recycling features whereby boards with missing chips are automatically returned to the pick and place station. Most system have also been expanded to accommodate a wider range of components and some now incorporate an optical system to automatically correct for board misregistration.

Leaded systems

Leaded automatic component insertion system such as axial, radial and DIP , represent a more mature technology. Axial lead insertion is really comprised of a family of machines, such as reel packaging systems, sequencing system (where applicable), component verifies and the component insertion machine
Automatic insertion of radial leaded components is complicated by varied body sizes and lead diameters. These problems were overcome by handling all radial lead components by the leads rather than the body, and by reel taping the leads at standardized spacing. Some components have been difficult to handle. For example, the TO-92 transistor with its three leads and 0.014in. lead diameter was not capable of being automatically inserted until a few years ago. Automatic DIP insert er are designed to DIP lead row spacing of 0.300in., 0.400in and 0.600in. The newer systems can also insert DIP sockets, DIPs into sockets and mount decoupling capacitors.

Odd – Shapped Components

Accurate component placement is a basic requirement for any picks and place machine. The first step towards accurate placement is accurate centering, or measurement of the component’sposition on the placement head. One of the most widely used centering methods for ICs, connectors, and oddshaped components are a camera based system that measures the component position relative to a known point. Camera based centering systems include three main elements: lighting, camera, and software. Each of these elements are critical to obtaining an accurate measurement of the component and ultimately for accurate component placement on the PCB. As the old adage goes, the system is only as strong as its weakest link.

IF you are considering automation of odd-form components in your PCB, in order of priority, consider these things:
1. Is your component available in a production package?
2. Is your lead to hole ratio suitable for automation?
3. Is the mechanical quality and repeat-ability of the component suitable for automation?
4. Does your component require lead preparation prior to insertion?
5. Does the process require that the component is clinched?
There are a lot more considerations, but above are the key factors that can make (or break) a successful implementation of odd-form components.

To know about our Automatic Insertion Machines – Click in the Product search ……

“LOW VOLUME AND HIGH PRODUCTION SMT /THT MACHINES”
Hi Smart Fellows,

Southern Machinery Sales and Services Company provide and support a large number of SMT /THT & Auto Insertion Machines models. Since with the day to day development of technology and with the passage of time new machines are coming to market that will need to be supported in the future.

I would like to ask for your input on new machines or technologies that you are considering or have already committed to in your facilities.
Are you looking for higher feeder capacity machines to reduce the changeover time from product to product or group to group? Are you looking for a surface mount technology one stop solution line which provides you $50k per month and mix production on monthly basis? Are you still using old technological Surface mount Technology machines?

Southern Machinery provides many different types of products, especially across different types of machines, then please let me know also as we have solutions for these challenges too. To know more please click.
http://www.smthelp.net/advanced-pcb-assembly-machines-and-spare-parts/
http://www.smthelp.net/smt-high-quality-automatic-dip-soldering-machine/
http://www.smthelp.net/benefits-of-smt-tht-pcba-manual-to-auto-insertion/

Thank You !

“CONTROL SYSTEM DESIGN OF SMT PICK AND PLACE MACHINE “

Here we would like to discuss original design of control system of complete SMT Pick and Place machine.

Proposed Design

Southern Machinery Provide different type of SMT Pick and Place Machines according to the requirements and Specification of Global Clients however one of our machine consists of four DC motors. Three of these motors are used to move machine head along X-axis, Y-axis and Z-axis. Fourth motor is for rotating SMT component clockwise and anticlockwise. Encoders are attached to shafts of all four motors. These motors are connected to motor drivers through electric connections. Encoder outputs routed to the EISA card mounted on EISA port. Data bus from EISA card is attached to external main board. Motor drive cards are mounted on main board. In addition to different signals for actuating different relays, data bus also carry control voltage signals. These analogue voltage signals vary in the range from +5V _-5V. Duty cycle of PWM signal vary with changing magnitude of this analogue signal.

Main Board

This is the part of our machines control system which acts as a bridge between EISA card and machines motors and feeders. All data signals and control voltage signals from EISA control card terminate at the main board. Depending on purpose which it serves, main board has several main parts. These parts are discussed here one by one.

Power Module

· This part of main board is associated with rectifying input AC voltage to DC voltage as shown in figure 5.1. Main functions of this part are following:
· Supply Power to motor drivers at 35v
· Supply 12V for powering operational amplifiers ICs. Supply 5V for powering TTL logic ICs.
· Supply 15V for actuating feeder plungers as shown in picture.

Protection Module
· This part contains relay switches to turn AC power on or off from software control as shown in picture.

Limit Switch Module
· This part deals with providing power source to proximity switches and receiving output of proximity or limit switches as shown in picture

Data Transmission Module
· This module receives data from some external data source through any programmable protocol (RS232 etc.) and routs that data to EISA card as shown in picture.

Feeder Relay Module
· This module consists of 15 relays. These relays actuate respective feeder plunger when decoded data is received. Each rely is connected with single plunger thus it controls one feeder at time as shown in picture.

Decoder Module
· This module receives 4 bit data from EISA card and decodes this data to 16 bits. 15 bits of decoded data are used to actuate one feeder at time as show in picture.
PWM Generation Module

· This part consists of two PIC18F2431 microcontrollers. These microcontrollers receive analogue control voltages and generate PWM. Microcontrollers are programmed such a way that duty cycle of PWM is function of input control voltage.

Motor Drivers

· Motor driver used in our project are H Bridge Bipolar type drivers. Input signal to motor driver are either bipolar PWM or analogue control voltage as show in figure
· 5.8. Motor driver use two kinds of power sources. One source is for driving motor
· when bridge is in conducting state. Motor driver receive 35V from main board for this purpose. Motor driver receive isolation supply from external transformers rated for 10V at output as shown in figure 5.9. This isolation supply voltage is rectified to DC voltage.

[tag smt,pcb,pcba,led]

BENEFITS OF SMT THT PCBA MANUAL TO AUTO INSERTION

Southern Machinery is affianced in supplying a wide range of PCB Assembly Equipments/Conveyors that is fabricated using high grade material, procured from quality conscious vendors. We are continually reinvests in the very latest technology and equipment based on customer demands and industry trends. Our Machines are widely acclaimed for easy adjustment, Low maintenance and high operational efficiency.

SOME OF BENEFITS FROM MANUAL TO AUTO INSERTION ARE STATED BELOW :
Decreasing labor cost
Predictable Product Quality – Less repairs
No wrong parts nor wrong polarity
Less risk of damage due to human contact (contamination, ESD, physical damage to components)
Easier manufacturing and operational Managment
Better clinching, less risk of solder issues.
Smaller factory space required to produce same volume of product
Decreased volume of inventory
Decreased Work in Process
Increased Inventory Turns
Quicker Product Change Over:
Less training • Fast product changeover
High Volume and High Mix capability
Decreased Energy Costs:
Low lighting and heating cost
Increasing labor costs make automation more attractive
As labor costs increase, the financial barrier to automation decreases, in many cases, becomes financially advantages.
Machines don’t require breaks, can run nearly continuously for fully automatic equipment, don’t call in sick, or quit.
Less management with reduced numbers of people.

Improved quality in the product
Less repairs/bad product due to wrong parts or wrong polarity.
Less risk of damage due to human contact (contamination, ESD, physical damage to components).
Significantly better clinching, less risk of solder issues.

Smaller factory space required to produce same volume of product
One machine can replace dozens of workers that require two or three times the factory space.
Allows customer to increase business without increasing factory space requirements.

Decreased Energy Costs:
Less lighting and heating costs / volume of product versus a factory large enough to house enough manual labor to produce the same volume.

Decreased Inventory:
Decreased volume of inventory
Decreased WIP
Increased Inventory Turns

Quicker Product Change Over:
Lines of people require training, changes in parts stock on line, more likely to keep the line dedicated.
Machines can change product in minutes, or accept engineering changes without training
Recommendations :

Use the Through Hole Design Guidelines to Teach :

How to specify a PCB able to be run with AI machines
Proper definition and selection of Tape and Reel or Ammo Pack components
Use the THDG as a way to provide “missionary” sales work for new customers
Make a Written Plan, using the Sales Checklist
Use the Sales Checklist
Create an RFQ to share and log the advance you get with the Applications Engineer and Product Team Manager, to get help in case special components, special boards, or special tooling Remember:
Remember :

Most Customers appreciate you show and teach them how to be self sufficient when selecting machines. This also helps to create trust.
Creating Trust will improve Customer relationships and eventually turn into business for you.

ADVANCED PCB ASSEMBLY MACHINES AND SPARE PARTS

Southern Machinery is affianced in supplying a wide range of PCB Assembly Equipments/Conveyors that is fabricated using high grade material, procured from quality conscious vendors. We are continually reinvests in the very latest technology and equipment based on customer demands and industry trends. Our Machines are widely acclaimed for easy adjustment, Low maintenance and high operational efficiency.

· WE DELIVER SMT/AI MACHINES TO OUR WORLD WIDE CLIENTS :
Surface Mount Paste Printing Machines
Surface Mount Placement Machines
Surface Mount Reflow
Auto Insertion Machines advanced Technology
Solder Station
Cleaning equipment
Laser Cutter
Special UIC/TDK/PANASONIC/SCIENCGO SPARE PARTS ………..

Some of Our Products are still in operation in different countries of the World.

Machines / Equipment
Make & Models
1.Automatic Loader
Southern Machinery / SLD- 400B
2.Buffer Conveyor
Southern Machinery / S – 350C
3. Automatic Screen Printer

Southern Machinery / SP – 1008
4.Pick & Place
Southern Machinery / S-600L
5.Pick & Place
Southern Machinery / S-1200-LV
6. Pick & Place Machine
Southern Machinery / S-320
7.LED High Speed Pick And Place

Southern Machinery / S-K100
8.SCRAP TAPE CUTTER

Southern Machinery
9. Lead Free Reflow Oven
Southern Machinery / S-6600
10.Lead Free Reflow Oven S-6600-PC
Southern Machinery / S-600-PC

11. Pneumatic Stencil Cleaner Machine

Southern Machinery

12. Automatic dip soldering machine

Southern Machinery / S-DS300
13. Radial Insertion Machine

Southern Machinery / S3000
14.Axial Auto Insertion Machine

Southern Machinery / S4000
15.Odd Form Inserter
Southern Machinery / S-7000I
16.Wave Solder Machine
Southern Machinery / S-WS250
17.Auto-Dip Soldering machine

Southern Machinery / S-500S
18.Automatic Spray Fluxing System
Southern Machinery
19.Shuttle conveyor -to merger production line 2 in 1
Southern Machinery / S8300
20.Solder Chip FEEDER

Southern Machinery
21. SMT Feeder Calibration jig
Southern Machinery
22.Desktop Pick & Place

Southern Machinery / S-48V
23.Vibrating Feeder -for LED lens
Southern Machinery
24. Solder Paste Mixer
Southern Machinery
25. N2 Dry Cabinet

Southern Machinery
26.Pneumatic Stencil Cleaner Machine

Southern Machinery / S-1688

SMT HIGH QUALITY AUTOMATIC DIP SOLDERING MACHINE

We hold an expertise in manufacturing a wide range of Dip Soldering Machine. Our range includes Dip soldering machine, automatic DIP soldering system, integrated automatic Dip soldering system and Integrated Automatic Dip Soldering System, which is manufactured using quality material. These provide to the requirements of various industries and are offered in various technical specifications to our clients. Southern Machinery – A leading name for the quality assurance of SMT/THT Machines worldwide.

Solder Paste and Its Application in SMT
Solder paste or solder cream is simply a suspension of fine solder particles in a flux vehicle. In electronics industry, solder paste is used in Surface Mount Technology (SMT) to solder SMDs on to the Printed Circuit board. The composition of the particles can be tailored to produce a paste of the desired melting range. Additional metals can be added to change paste compositions for specialized applications. Particle size and shape, metal content and flux type can be varied to produce pastes to varying viscosity.

Solder Paste Screen Printer
Some of the major features to consider when selecting screen printer for solder paste are the maximum size of the circuit board that can be handled, controls of accurate screen alignment and repeat ability of print, and the board hold-down mechanism. Considerable progress has been solder paste dispenser, screening and stenciling for pastes on substrates. Each method of dispensing solder paste has its own pros and cons but the most widely used method is stenciling for both rework and large scale production. Southern Machinery is a well-known supplier of screen printing equipment.

Stencils for Solder Paste Application
There are three main ways of making stencils for solder paste:
Chemical etching
Laser cutting
Electroforming
Chemical etching is the oldest, most widely used, and least expensive option. Laser cutting and electroforming, especially the latter, find appeal in applications where precision is paramount. In addition to the type of stencil, the type of squeegee blade is very important. Metal blade squeegees are widely used because they require less maintenance than rubber squeegees.
Availability of Solder Paste
Solder paste is available in both leaded (with lead) and lead-free (with no lead) forms. It can be no-clean or water soluble. With no-clean solder paste, there is not need to clean the board after soldering. Water soluble solder paste is easily soluble in water with no harm.
S-DS300Automatic dip solderingmachine

Specification :
Model
S-DS300
PCB width
Max.50～300mm(The longest support 350MM)
Transportation height
750±20mm
Transportation speed
0～1.8M／Min
Transportation Angle （Welding Angle）
0～7 degree
Transportation direction
From L to R
Component height limit
Max.80mm
Maximum capacity
250Pcs/hour
Dip soldering area
350X300MM
Preheating zone length
350mm(Stay – can set the preheating time)
Preheating zone number
1
Preheating zone power
2.1kw
Preheating zone temperature
Room temperature～250℃(Can be set up）
Heating mode
Far infrared
The power of the stove
7.2kw
"Tin stove dissolve tin amount
85KG
"Tin stove temperature
Room temperature～350℃、Control precision ±1℃
Temperature control mode
P.I.D+SSR
Machine control mode
Touch screen +PLC
Flux capacity
3L
Spray way
Import shower
power supply
3 phase 5 wire 380V
Starting power
10kw

Chinese New Year is coming, and you’re probably thinking about the delicious homemade food, relaxing afternoon naps, and great time with friends and family. Don’t let these illusions blind you, though. You are walking into the apocalypse, and no one is on your side.

1. The Two-Faced Parents
For the first two days at home you’ll be their sweet baby, and starting from the third day they want to throw you away. You wake up at 9 and they say you are lazy. You wear ripped jeans and they say you are dirty. You eat too little then you are not giving them “face”. You eat too much then they say you are fat and will be single forever. There’s no chance of winning to argue with your parents. The only advice that could possibly help is to just wait – wait until you become a parent and take revenge on your own kids.

2. The Drama Queen Aunties
“How much money do you make now?” "Why are you still not married?” "When are you buying a house in Beijing?” Boom boom boom – drama queen aunties just released a trifecta. “My son got the 2nd place in the final!” “My daughter married a government official!” “I am having a grandchild in a month!” Whoops – drama queen aunties unlocked the advanced attack – kid comparison, it’s a killer. It’d be stupid to take it head on, but you can out-flank by dropping another drama bomb:“My mama don’t like you and she likes everyone.”

3. The CNY Friends
The CNY friends are those people who you are only friends with during Chinese New Year. However, they never come with good intention. “Hi how are you! Btw my wedding is next Monday.” Hand in ¥600. “How have you been? Oh right, it’s my baby’s 100-day ceremony tomorrow.” Hand in ¥800. “Long time no see! What a good timing that it’s my husband’s funeral today!” Hand in ¥1000. Are they the CNY friends, or CN¥ friends? The only way to get away from them is to go on the offense. Spread the rumor that you are diagnosed with brain cancer and are looking for friends to borrow money from. It will make them disappear.

4. The Annoying Kids
Eating up your favorite snack, drawing a penis on your expensive bag, and screaming at you for red pocket money – the annoying kids seem to be always high on ecstasy. Don’t even try to complain, otherwise they bring in the drama queen aunties to help:"He is just a kid! You are an adult! You are supposed to take care of him!" Well played, kids and aunties. The proper way to deal with annoying kids is to deal with them like the stupid hot girl at the party: you give them a lot of tasty alcohol and take them to bed – they won’t know a thing.

Thanks for reading this article, and hope you have an amazing holiday whether you are sipping cocktails by the beach, or playing MaJiang and chain smoking at home.