00198574-01_Process_Foundation_DEK_Micron_EN.pdf - 第11页
3 Stencil Print Process Foundation DEK Micron-Series 12/2017 11 Print Cycle Critical Success Factors The screen-printing process is a combination of many factors and variables and to ensure that the process is successf…
3 Stencil Print
10 Process Foundation DEK Micron-Series 12/2017
Exercise
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Set up the printer to run a product
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Remove the squeegees and set the print pressure to 0kg
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Cycle a board from left to left
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Observe the machine as it carries out a print cycle
Number these actions in the correct sequence:
Camera Moves to Board Stop position Board exits machine
Tooling clearance check Board Stop is lowered
Fiducial positions are captured Board separates from stencil
Board travels to Board Stop position Stencil alignment completed
Press RUN Board is unclamped
Board is clamped in rails Board stop is raised
Camera homes Print stroke carried out
Board lifts to stencil
The Perfect Print
When inspected, a perfect print may have the
following features:
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Straight and clean edges
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Flat and even top surface
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Consistent print height from pad to pad
and board to board
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Good alignment – centralised on the pad
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No flux bleed or print material out with the
deposit (i.e. solder balls)
3 Stencil Print
Process Foundation DEK Micron-Series 12/2017 11
Print Cycle
Critical Success Factors
The screen-printing process is a combination of many factors and variables and to ensure that the
process is successful in its aim, each of these must be kept in control.
The critical factors are: What control do I have over
these factors?
Process Hardware
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Board (Substrate)
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Tooling
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Stencil Print Material
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Squeegees
Process Parameters
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Print Speed
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Print Pressure
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Separation Speed
Under-screen Cleaner
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Settings
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Performance
Environment
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Temperature
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Humidity
Machine Condition
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Clean
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Free From Damage
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Machine accuracy
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Machine repeatability
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Machine regularly, ser-
viced and maintained
Training
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Printer Staff Suitably
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Qualified
This course will provide the knowledge required to keep these critical success factors in control and
thus maintain a robust process.
Exercise
Complete the table above. Next to each critical success factor, identify what control you have over
them i.e. do they fall directly under your area of responsibility, if there was a problem could you
simply change it or would you need to escalate the problem?
3 Stencil Print
12 Process Foundation DEK Micron-Series 12/2017