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Varnish
Mixing |
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Epoxy resin and other chemical components are mixed to make varnish. |
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Treating
(Impregnation) |
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Varnish coats the glass fabric, passing through hot treating zones for curing. The semi-cured product is called prepreg. |
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Prepreg
Ply-up |
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Prepreg can be sold to PCB makers multilayer board fabrication, or cut and plied-up in-house for laminate manufacturing. |
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Book
Forming |
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Cut and plied-up prepregs are stacked together with copper foils to form "books". Steel plates are used as separators for these stacked piles. |
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Laminate
Pressing |
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These "books" are placed inside the press under high pressure, heat and in a vacuum. Prepreg melts and bonds together with copper foils to form fully cured laminates. |
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Debook
and
Edge Trim |
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Laminates (copper+prepregs+copper) are separated from the steel separator plates, then the excess edges are cut away. |
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Test
and
Inspection |
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Laminates are tested and surface inspected before shipping to customers. |
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