00198574-01_Process_Foundation_DEK_Micron_EN - 第23页
4 Process Hardware 4.4 Print Material Process Foundation DEK Micron-Series 12/2017 23 Exercise Complete the table below for the specific material that you use in production. Information can be found from the material dat…
4 Process Hardware
4.4 Print Material
22 Process Foundation DEK Micron-Series 12/2017
Using Print Material (Squeegee)
4.4.1 Re-using Print Material
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Only re-use print material if there have been no printing problems
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Discard old material or dry material around the edges or on the squeegees / wiper blades
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Store good material in a sealed container overnight
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Do not mix used and new material in the same container
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The exact procedure for re-using a material will depend on its type and quality as well as
economic considerations
Storage
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Store material in order of age and use FIFO (first in, first out) procedures
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Store as per manufacturers instructions
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Refrigeration may be required for long periods
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Storing at room temperature is OK for short periods and may cause fewer problems then
failing to normalise material taken from a refrigerator
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Minimise temperature fluctuations during storage
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Label material clearly showing the date and time taken out of storage
Example:
4 Process Hardware
4.4 Print Material
Process Foundation DEK Micron-Series 12/2017 23
Exercise
Complete the table below for the specific material that you use in production. Information can be
found from the material data sheets, production data sheets, from the Internet or by asking your
instructor or process engineer.
Material Type and Product Code:
Personal Safety Precautions:
Method of Maintaining Roll Volume:
(Manual or Auto-dispense)
Knead Strategy:
(Manual, Programmed or Both)
Working Temperature Range:
Storage Procedure:
Re-use Procedure:
Disposal Procedure:
Notes:
4 Process Hardware
4.5 Squeegees
24 Process Foundation DEK Micron-Series 12/2017
4.5 Squeegees
The purpose of the squeegees is to provide a transfer force suitable for pushing the print material
through the stencil apertures and onto the board. There are many squeegee types and designs
available, and it is very important that the correct one is used as specified by the process design.
Squeegee Material and Angle
The two fundamental design choices associated with squeegees are material type (metal or
polyurethane) and blade angle (45°C or 60°C). The graph below demonstrates the impact that the
squeegee design can have on print performance.
Print Height
A Metal Squeegee
B Polyurethane Squeegee