A customer called the Helpline seeking advice for cleaning no-clean fluxes prior to applying a conformal coating. The customer's assemblies were manufactured with a no-clean rosin based solder paste (ROL0) and were cleaned with an isopropyl alcohol (IPA) wash. After cleaning, a white residue was sometimes found in areas with high paste ...
The set up of a turnkey conformal coating production line or facility, whether it is a batch or inline process, has many similar characteristics. Whether the coating application is based around a high volume selective coating robot, a batch dip coating system or a spray booth, the process requirements tend to be the same. This bulletin reviews ...
As the proliferation of modern day electronics continues to drive miniaturization and functionality, electronic designers/assemblers face the issue of environmental exposure and uncommon applications never previously contemplated. This reality, coupled with the goal of reducing the environmental and health implications of the production and disposal of these devices ...
Conformal coatings are applied to Printed Circuit Board Assemblies(PCBAs) using a variety of different methods. There are six main methods of applying conformal coatings: manual spraying, automated spraying, dipping, brushing, selective coating, and vacuum deposition.
Conformal coating is an enabling process that allows for the ruggedizing of electronic devices and modules. As the process increases the durability of electronics that are subjected to various end-use environmental conditions, it adds value to the product. While it does add value, consumers and manufacturers expect the electronics to work when subjected to dirt, humidity, moisture, corrosive materials, and various other contaminants. This expectation results in a drive to minimize the cost of the process. The lowest cost of ownership for a conformal coating process occurs by utilizing automated selective conformal coating equipment.
The measurement of the conformal coating thickness on a printed circuit board (PCB) to ensure internal and international standards are met is now a critical factor in conformal coating process control.
There are several methods for measurement of conformal coating thickness and they fall into two categories. These categories are wet film measurements applied during coating application and dry film measurements made after the coating is dried enough not to damage the coating.
When it comes to the application of conformal coating, curing the coating plays a key role in the circuit assembly and selective conformal coating process.
Curing conformal coating occurs after the coating spray/dispense process is complete. The coating is considered "cured" when the conformal coating on the circuit assembly is sufficiently tack-free to be handled. Curing can sometimes be accomplished at room temperature but takes a considerable amount of time to dry. Accelerated conformal coating curing decreases this drying period, the cure process reaches either the tack-free or a fully dried state but not quite having fully cured properties. Accelerated curing techniques include one or a combination of heat, moisture, UV light, and chemical reaction curing. This article focuses primarily on thermal or heat curing.
modifying old camalot 1414 -- Has anyone here experience with re-purposing a Camalot dispenser (dos based 90's vintage)?
It is a really robust and accurate gantry, would like to create programs to raise and lower a spindle mounted to the head - the 1414 I have has fudicial camera as well so accuracy will be pretty good.
Glass BGA -- IPC states chips and cracks in glass body are defective if beyond specifications.
Chips or cracks in glass body beyond the part specification,
see Figure 9-18.
Cracked or damaged glass bead beyond part specification
On some glass BGA components I can not find a specification on the data sheet. What is the risk with these if they have minor cracks or chips on the corners?
I.C.T Selective wave soldering is a special form of wave soldering invented to meet the development requirements of through-hole components soldering. It is mainly suitable for the soldering of through-hole components in high-end electronic products. For example: military electronic products, automotive electronics, switching power supply products and other industries which require higher soldering reliability....
Nordson TEST & INSPECTION, a division of the Nordson Corporation (Nasdaq: NDSN), announced that VAS Engineering has successfully installed an Assure FLEX Component Counter and has seamlessly integrated it into their inventory management process. VAS Engineering has provided San Diego with quality contract manufacturing services for the electronics industry since 1987....
IPC is a US-based trade association dedicated to the competitive excellence and financial success of its nearly 2,600 member companies which represent all facets of the electronic interconnection industry, including design, printed wiring board manufacturing and electronics assembly.