What you should know
MultiPress S Operating manual 3.0 Rev 3.6.2009 29
4. What you should know
This chapter gives you general information on the structure of a
multilayer and the materials required for constructing it. In addition, you
will learn about the individual stages of the press process, which will
allow you to configure later on special press profiles for different
applications and materials.
4.1 Structure of a multilayer
In order to produce a multilayer as thin as possible, we recommend the
use of the following LPKF materials.
Inner layers Multilayer comprising four layers:
Base material FR4 18/18 µm, 1.0 mm (40 mil) thick, coated on both
sides.
Multilayer comprising six and eight layers:
Base material 104 ML 18/18 µm, 0.36 (14 mil) thick, coated on both
sides.
Outer layers: For galvanic through hole conductivity:
Laminate 104 ML, 5/0 µm, 0.2 mm thick, coated on one side, including
protective film.
For chemical free through hole conductivity with LPKF ProConduct:
Laminate 104 ML, 0/18 µm, 0.2 mm thick, coated on one side, including
protective film.
Composite material Prepreg (pre-impregnated, insulating fiber material), 0,1 mm (4 mil) thick.
Depending on application and further processing, it may be necessary to
mill and drill the materials before and/or after the press process.
Depending on layout, one or two layers of prepreg may be required
between the individual layers (see chapter 6.6.2‚ "Assembling the
multilayer in the press mold", on page 50).
Tip: Detailed information on special applications, materials tested by
LPKF and tips for optimum processing can be obtained from the LPKF
Support.
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