Multilayer Circuits Fabricators For more than 20 years we are a value-added supplier in the PCB-Industry.

... of PCBs often leads to the question as to which surface protection is the right one. This is partly due to the changing technical | MULTILAYER CIRCUITS FABRICATORS | demands on PCBs in further processing. Also, as of 1. 6. 2006, EU-Regulations restricting the use of dangerous materials in electronic appliances are to include | MULTILAYER CIRCUITS FABRICATORS | the prohibition of materials containing lead, and is, therefore, another reason why alternative surfaces have been developed. One of these is immersion tin. PROCEDURE A | MULTILAYER CIRCUITS FABRICATORS | layer of tin is applied to the PCB by means of a special process, in which the copper atoms of the exposed conductors and contact | MULTILAYER CIRCUITS FABRICATORS | areas are exchanged for tin atoms by adding thiourea. The chemical reaction ends when the copper surface is 0,6 to 1,2 my. Between the tin | MULTILAYER CIRCUITS FABRICATORS | and copper layers there is an inter- metallic copper-tin phase after this process, i.e. blended metal. There are a number of reasons in favour of | MULTILAYER CIRCUITS FABRICATORS | applying tin chemically. One advantage is the uniform smoothness of the surface. This feature enables the application ...
[ Multilayer Circuits Fabricators ]


... a good quality board to be produced. Another important criteria is the presence of orientation marks within the boundary of board. These marks could | MULTILAYER CIRCUITS FABRICATORS | be the board reference so long as it cannot be read from the other side. (This is for your protection to prevent the boards made | MULTILAYER CIRCUITS FABRICATORS | inside out). | IMAGES | should comply with design rules that will result in a board that will meet performance and cost requirements. - | | MULTILAYER CIRCUITS FABRICATORS | SCALE MUST BE GIVEN, | tapes securely stuck to the backing sheet, track to pad & track to track joints complete and the backing sheet | MULTILAYER CIRCUITS FABRICATORS | clean. - Scale must be given and be at least 2:1. Plots must also offer sharp edge definition and traces dense enough for blocking light | MULTILAYER CIRCUITS FABRICATORS | when photographing. - Preferred on 7mil (178mm) thick base for stability. Films should be plotted on laser photoplotter or on vector photoplotter using a minimum | MULTILAYER CIRCUITS FABRICATORS | resolution of ½mil (13mm). - Preferred in Gerber® format although accepted in other formats. (Refer to CID- 014 for information on Documentation ...
[ Multilayer Circuits Fabricators ]


... types of layers lead to huge file sizes. Negative plane layers are usually preferred by fabricators because they're easier to work with and have | MULTILAYER CIRCUITS FABRICATORS | smaller file sizes than positive layers. Remember, boards are manufactured en masse and must be stepped out into a panelized form. The result: Data sets | MULTILAYER CIRCUITS FABRICATORS | with lots of unnecessary positive planes swell exponentially, bog down CAM systems, and crash photoplotters. After the basic prep work is completed, step into the | MULTILAYER CIRCUITS FABRICATORS | fabrication analysis arena, where the game is one of checks and balances. You've got your design rules; fabricators have theirs. Checks and balances can resolve | MULTILAYER CIRCUITS FABRICATORS | any conflicts between the two. Take soldermask layers, for instance. Often, these layers are not "intelligent" layers within a CAD tool; that is, there is | MULTILAYER CIRCUITS FABRICATORS | not much in the way of capability checking within the tool. As a result, these are among the more troublesome layers for fabricators. The solution | MULTILAYER CIRCUITS FABRICATORS | here is a fabrication analysis tool that can handle such issues as ...
[ Multilayer Circuits Fabricators ]