![]() the mesh has been glued to the frame using kiwo 1000′. The tension on the Swiss mesh is 25 newtons. Professional qualityĪluminium silk screen frames are on offer in sizes 12×16, 16×20, 20×24, 23×31 and35x26. If you have any questions, please feel free to contact us with, we will be happy to help you.Aluminum ready stretched screens. We can provide silkscreen on your PCBs for you, and we will try our best to meet the demands of silkscreen. With over 10 years as an industry leader, PCBGOGO is one of the most experienced PCB and PCB assembly manufacturer in China. highly specialized not only in quick-turn PCB prototype and PCB assembly, but also medium and small volume PCB fabrication. The absence of reference, pin 1 and polarity indicators may lead to incorrect component orientation or placement, which could have a negative effect on device functionality. Polarity indicators – these provide the orientation of polarized components.įor components with small numbers of pads or simple shapes, it may be acceptable for general placement to have the absence of the component outline. However, there still exists the possibility of asymmetrical placement, which may lead to problems during soldering, for example tombstoning. Pin 1 indicator - this indicates which pins connect to what pads of the footprint.Ĭomponent outline – this, in conjunction with the landing pattern, indicates where the component should be placed. Reference indicators - these identify the component types from the BOM. There are some silkscreen markings used to accurately place components as follows: The application of PCB silkscreen is done during PCB fabrication, but it’s used for the PCB assembly process steps, which is mainly in referring to placing or mounting components. It should be noted though that the acrylic ink does not cure on boards with silver finishes. The ink is cured with UV light as it is printed. In this process an inkjet projector is used with acrylic ink that is applied onto the raw PCB directly from the CAD data. It is much more accurate than manual screening.ĭLP is the most accurate of all these processes but is more expensive. ![]() After this the board is developed and cured. In this a liquid photo-imageable epoxy is coated on to the laminate and then exposed with UV light. Liquid Photo Imaging is quite similar to the process used for the application of solder mask. This method is used when the line widths are greater than 4 mil. Nowadays, there are the two most common silkscreen PCB printing techniques, such as liquid photo imaging (LPI) and direct legend printing (DLP). In the past few years, the primary method of silkscreen referred to using a stencil to directly apply ink to the board surface. Importance of the s ilkscreen PCB to a ssembly Identification numbers unique to each board Location of parts through reference designators For traditional silk-screening you require a polyester screen stretched on aluminum frames, a laser photo plotter, spray developer and curing ovens.Ī silkscreen can provide the following information: PCB software also uses standard fonts in silkscreen layers but you can choose other fonts from the system too. The standard colors we normally see are black, white and yellow. The ink used for these markings is highly formulated. Essentially a detailed PCB silkscreen can help both the manufacturer and the engineer to locate and identify all the components. This silkscreen is usually applied on the component side however using silkscreen on the solder side is also not uncommon. ![]() ![]() Silkscreen is a layer of ink traces used to identify components, test points, parts of the PCB, warning symbols, logos and marks etc. When you design or order your printed circuit boards, do you need to pay extra for silkscreen? There are some questions you need to know what’s silkscreen? And how important silkscreen is in your PCB fabrication? Now PCBGOGO will explain for you.
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