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SMTnet Express, June 15, 2023, Subscribers: 24,830, Companies: 11,818, Users: 28,067

█ Electronics Manufacturing Technical Articles

Stencil Design For Mixed Technology Through-Hole / Smt Placement And Reflow

This paper will review stencil design requirements for printing solder paste around and in through-hole pads / openings. There is much interest in this procedure since full implementation allows the placement of both through-hole components as well as SMD's and the subsequent reflow of both simultaneously. This in turn eliminates the need to wave solder or hand solder through-hole components.

Credit: Photo Stencil LLC

Stencil Printing Process Tools for Miniaturisation and High Yield Processing

The SMT print process is now very mature and well understood. However as consumers continually push for new electronic products, with increased functionality and smaller form factor, the boundaries of the whole assembly process are continually being challenged. Miniaturisation raises a number of issues for the stencil printing process. How small can we print? What are the tightest pitches? Can we print small deposits next too large for high mix technology assemblies? How closely can we place components for high density products? ...And then on top of this, how can we satisfy some of the cost pressures through the whole supply chain and improve yield in the production process! Today we are operating close to the limits of the stencil printing process. The area ratio rule (the relationship between stencil aperture opening and aperture surface area) fundamentally dictates what can and cannot be achieved in a print process. For next generation components and assembly processes ...

Credit: ASM Assembly Systems (DEK)

The Effect of Higher Stencil Tension on Printing Performance

In this article we will examine if there is a measurable difference in the printing performance when using stencils which have a higher tension than is commonly accepted in the industry. Alpha's new tensoRED™ High Tension Frame System will be introduced during this wider examination. We will examine their effect in terms of controlling variation in critical deposit volumes and what, if any effect on positional accuracy can be seen.

Credit: Alpha Assembly Solutions

Optimizing Stencil Design For Lead-Free SMT Processing

As any new technology emerges, increasing levels of refinement are required to facilitate the mainstream implementation and continual improvement processes. In the case of lead-free processing, the initial hurdles of alloy and chemistry selection are cleared on the first level, providing a base process. The understanding gained from early work on the base process leads to the next level of refinement in optimizing the primary factors that influence yield. These factors may include thermal profiles, PWB surface finishes, component metallization, solder mask selection or stencil design.

Credit: Cookson Electronics Assembly Materials

Using Stencil: Design to Reduce SMT Defects

Solder paste printing is understood to be the leading contributor of defects in the electronics assembly process. Because yield accounts for such a large percentage of the margin, the greatest opportunity to improve profitability in the assembly of most electronics can be gained by reducing or eliminating solder defects. This article examines process adjustments made through stencil design that correct a misalignment situation between the PCB and stencil, leading to a 43% reduction in assembly defects. Examples of each are found in Table 1.

Credit: AVI Precision Engineering Pte Ltd

SEE Forum results for related keywords - stencil -- 5620

	LEARN MORE in the Technical Library...
In the past year, the number of technical papers that contributors added to the Technical Library was: 143	MAKE Your Paper More Visible...

█ Printed Circuit Board Assembly & PCB Design Forum

How to prevent BGA issue of SMT solder resist when fabricate PCBA -- Nowaday,more and more assembly line of factory face issue of BGA calibrate,I am very sincerely to ask for solution how to avoid this issue,may there some asset here to give?tks.

Exsessive assembly cleaning -- Hello folks, is there a standard you follow for maximum cleaning cycles? We are debating how many times we should clean a board for misprints on the second manufacturing side? First side is already assembled and I wonder how many times we can safely clean this panel?

	SEARCH the PCB Assembly Forum
In the past year, the number of threads opened on the FORUM seeking help was: 282	CONTRIBUTE to the Assembly Forum...

█ SMT, PCB Electronics Assembly Manufacturing Industry News

HELLER Appeared at CEIA Wuhan Seminar

HELLER joined the 97th CEIA China Electronics Intelligent Manufacturing Summit Forum convened in Wuhan, garnering substantial attention from industry insiders. The conference concentrated on a wide array of fields, including optoelectronic communication, military electronics, and EV automotive electronics. With an impressive turnout of nearly 500 industry colleagues, the event proved to be an invaluable platform for networking and knowledge exchange....

Heller Industries Inc.

Presenter for HELLER at CEIA Wuhan Seminar

I.C.T | SMT & DIP Solutions for Solar Panel Manufacturing

I.C.T As a leading provider of SMT solutions supplier, our advanced technologies and industry knowledge allow us to optimize production processes, ensuring seamless integration of electronic components onto solar panel assemblies....

I.C.T

I.C.T | SMT & DIP Solutions for Solar Panel Manufacturing

SMTA Releases New Online Training Course on PCB Purchasing Best Practices

The SMTA announced that a new 101-level online training course, "Successful PCB Purchasing 101," is now available in the training section of the SMTA website....

Surface Mount Technology Association (SMTA)

GET more Electronics Assembly Manufacturing News...

█ SMT / PCB Products & Services

NEW SMT / PCB EQUIPMENT & SERVICES - For Sale

Dispensing

Catalina Benchtop Dispense Robots

GPD Global

Reflow

PCB Reflow Oven Machine I.C.T Lyra Series

I.C.T

SELECTIVE SOLDERING

Pillarhouse Jade Handex

Pillarhouse USA

PCB INSPECTION

MV-3 FIVE CAMERA In-Line AOI System

Mirtec

PCB SOFTWARE

ProntoSELECTIVE-SOLDERING

Unisoft

PCB ASSEMBLY

PCB Fab & Assembly

Imagineering

REFLOW OVEN

Voidless / Vacuum Reflow Soldering Oven

Heller

VIEW More New Electronic Manufacturing Products...

█ SMT / PCB Assembly Equipment Auctions

Currently, no featured auctions are on SMTnet

VISIT the Assembly Equipment Auctions Calendar...

█ Electronic Equipment Mart

MART - Used Electronic Assembly Machines For Sale

SPI / Paste Inspection

Viscom S3088 Basic

Baja Bid

PCB PRINTING

DEK NEOHORIZON 03iX

SMTUnion - DEK NEOHORIZON 03iX

SMTUnion

Gen'l Purpose T&M

Zeiss LSM-880 Laser Scanning Microscope

World Equipment Source, LLC

P&P / FEEDERS

Panasonic NPM-W P&P

AllSurplus Panasonic NPM-W P&P

AllSurplus

P&P / Feeders

Assembleon AX201

KD Electronics - Assembleon AX201

KD Electronics

AOI INSPECTION

Viscom S3088 Ultra Chrome 3D AOI

Lewis & Clark Viscom S3088 AOI

Lewis & Clark

	VIEW More Used Equipment For Sale...
In the past year, the number of your RFQs that SMTnet sent to equipment suppliers was: 101	SEND a RFQ to Equipment Suppliers ....

MART - Used PCB Assembly Equipment Wanted To Buy

PCB TEST

Agilent 3070

KD Electronics Agilent 3070

KD Electronics

Soldering - Reflow

Vitronics XPM 1240

Baja Bid

P&P / FEEDERS

Assembleon MG-1R

World Equipment Source Assembleon MG-1R

World Equipment Source, LLC

PCB TEST

Agilent 3070

Lewis & Clark Agilent 3070

Lewis & Clark

SEE Buyers' Used Assembly Equipment Wants

█ Electronics Manufacturing & Assembly Events Calendar

EVENTS

Symposium on Counterfeit Parts & Materials - United States | June 27 to 29

SMTA

Ontario Chapter Technical Webinar: Assembly & Rework: High-Speed Press-Fit Connectors | June 27

SMTA

Queretaro Expo & Tech Forum | July 13

SMTA

ADD Your Electronics Manufacturing and Assembly Event Now ...

█ Electronics Manufacturing Training Courses & PCB Assembly Training

FIND TRAINING FOR:

IPC Certification

Soldering & Rework

PCB Design

Electronics Assembly

Electronics Inspection

Online Training