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The electronic printed circuit board industry is evolving, as new manufacturing technologies become available at low cost. Direct digital printing has taken over traditional photolithography and screen printing processes during the traditional PCI production over the last twenty years.

Here, we focus on direct digital printing to personalize PCBs before they are assembled. The goal is to print a unique tag on individual tables that can be used to identify the forum. The signal must be constant and probably contains 1D or 2D machine-readable codes along with alpha numeric characters. Signals must have a resolution of 600 DPI (dots per inch) or better due to PCB size restrictions. We also focus on applications that require more than 1,000,000 sheets annually. In these volumes, automated material handling plays a very important role in the overall success of the system.

Large-scale PCB manufacturers use screen printing with thermally cured ink to print legends covering both sides of the paper. At present, digital printing can not print the full side of the board at a price that competes with screen printing. Despite the fact that many printers, including the PPS7000, are able to print the nomenclature on the board, focus only on digital printing to print custom markup.

Many custom settings exist, including:

Preprinted Label Application

Many small-scale products start with labels printed with office tools and are hand-picked for each PCB before or after assembly. As the product amounts point out, the reliability and cost of manual labeling of the labels becomes a problem. Automated systems are available for printing and applying labels. (see on this page ) Because of PCB room constraints, these systems need to have very accurate labels, which is a big problem for many label application systems. Labels are not constant.

  • Low Initial Cost
  • High Contrast Signal
  • Cons

    • Not Standing
    • Higher Incremental Cost
    • High Volume Releases
    • Difficult To Change Tag Size on Plane
    • Mechanical Complexity for Automatic Application [ ] Solvent Based Continuous Inkjet Digital Printing

      Continuous inkjet technology was used for a number of industrial products, including PCBs. With these systems, the continuous flow of ink droplets is directed to the desired location using electromagnetic fields. Solvent-based inks form permanent traces on porous surfaces. Labels are less durable on non-porous surfaces where mowing can cause problems for a short time to remain dry.

      • Competing Increasing Cost
      • High Contrast Signal

      Cons

      • Complex Ink Visibility Process Difficult To Control
      • Is High Resolution (Over 300dpi) Difficult to Access?
      • Solvent Emissions into the Atmosphere Many Companies Try to Reduce Solvent Problems
      • Mark Is Not Resistant For Certain Solvents

      Laser Spotted Ink Stains

      Many industries use lasers for various parts of engraving. Lasers were used to limit the signals to PC boards as the contrast of the received signal is missing. Another approach is that the printed circuits are printed with ink cartridges and then the ink cartridge is selectively removed (removed) from the laser, which gives the print signal. (19459004) PPSI is able to develop a laser-based marking system.

    • Highly Affordable High-Reliability Marks with Laser Head Heads

    Consponsive

    • Highly Cost-High
    • High Contrast Marking if Inkjet Can Use
    • Required Printing Ink Repair Required
    • Causes of Breaker Reliability Issues
    • Particle Preparation May Require a Purge Step

    Piezoelectric Downgrade on Demand Digital Printing on Solvent Based Ink

    Description: [http://www.aellora.com/documents/whatisdodij.pdf]. In my opinion, this option is a minor improvement in Option 2.

    • Competing Increasing Cost
    • High Contrast Signal
    • Many Available Colors
    • Easier Process for Continuous Inkjet Control [19659010] Cons

      • Prolonged distance of less than 2 mm only
      • Emissions of solvents into the atmosphere, many companies try to reduce solvent emissions
      • Not to clean some cleaning solvents

      Piezoelectric drop Demand digital printing, heat-treated ink [196450000]

      A startup company in Israel & # 147; Print & # 148; introduced a small, fast speed printer that needs to reduce the cost of printing small-print screen printing and release time. Interestingly, the thermally hardened ink, which is reported to have better adhesion than other ink systems.

      • Benefits

        • Good Ink Supply?

        Disadvantages

        • Requires Large Oven at 350-400 degrees F Heat Treatment [19659009] Does Not Contain Large Volume Materials

        Piezoelectric Deposition on Demand Digital Printing With UV Protected Ink

        Markem Corporation has developed an ink / printhead system (see Model No. 4000 here ), used by many OEMs and integrators to print PCBs. The system uses an ink that is less viscous, at a high temperature and at room temperature, almost firmly. The print head operates at 68 ° C, the ink darkens when it is in contact with the printed circuit board and is almost solid. This allows the system to print fine detail on printed circuit boards without ink or smudging. When exposed to UV rays, ink becomes a chemical reaction, which becomes a solid plastic material. Curing ink is impermeable to common solvents

        Benefits

        • Competitive Increasing Cost
        • High contrast with fine detail (600 DPI)
        • Before dyeing the ink can be deleted
        • After curing
        • Large quantities of material handling available
        • works well with the inline test (check pre-hardening treatment, only condition the good cards)

        Disadvantages

        • Some materials may cause problems
        • The PCB must be kept clean
        • Less than 2 mm interruption distance can only be used for non-lockable boards

        The PPS 7000

        The PPS7000 used with option 6 printed on PCBs. The system uses a SMEMA compatible wind band conveyor to relocate PCBs to the print area where they are printed and optically checked. After inspection, the inline hardening station is placed on the back of the machine. When the on-board blade is automatically loaded, the panels exit once every 10 seconds. Each panel usually contains multiple sheets, each of which has a unique serial number. The total flow of the machine depends to a large extent on the number of panels in each panel. The more panels in each panel, the higher the per-unit performance per minute. The WYSIWYG (you see what you get) is a pull and sink programming system that allows you to program a new panel for approx. in 5 minutes. An offline programming system is also available

        We are the only PCB card markup system that generates a constant (solvent-resistant) high contrast signal that includes SMEMA-compatible large amounts of material handling and includes inline controls

        Next Steps

        If the PPS7000 looks as though it meets the requirements, the next step is to print the samples in order to check that the ink fits well into its socket

        © 2006 by Prototype & Production Systems, Inc.

        Unlimited distribution is free if this copyright notice and http://www.prototypesys.com

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