| What is merits are as follows; |
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Shorten the manufacturing process for manufacturer of FPC
Usually lamination of bonding sheet at FPC manufactures is as follows; |
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Punching Bonding Sheet following design |
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Take away releasing paper from Bonding Sheet |
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Pre-Lamination to FPC by heat roll |
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Take away releasing film from Bonding Sheet |
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Set up of FPC or Ridged Board (Insert Bonding Sheet between FPC and another FPC or Ridge Boards) |
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Lamination by heat press |
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In case of Super Bonding Sheet, process is follows; |
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Punching Super Bonding Sheet following design |
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F Set up of FPC or Ridged Board with Super Bonding Sheet |
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Lamination by heat press (FPC and another FPC or Ridged Boards using Super Bonding Sheet) |
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Only three steps are necessary and no waste due to any releasing paper and film. |
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Fig.1 : Comparison of Process |
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| 2) |
Yield Up for FPC Manufacturer
In case of lamination using prepreg, smashed resin powder from cut edge of prepreg sometimes attaches to FPC surface and it will be root of cause of yield down.
In Super Bonding Sheet, there is no smashed resin powder from edge of it after punching and it will contribute yield up of process. Our expectation of improvement is around 20-60% of current failure rate. |
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Fig.2 Difference of Appearance of Cut Edge between Super Bonding Sheet and Prepreg |
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Other strong points are as follows;
<Merits for FPC Manufacturer> |
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Good handling characteristics (Set up by sheet is enable) |
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Non-flow design and quite short resin flow from laminate edge |
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No smashed resin powder in punching process |
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Short heat pressing time compared with prepreg about 40-50 min |
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Enable fine pitch manufacturing due to coplanality of laminated surface area |
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<Merits for Assembler> |
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Good reliability due to better adhesion strength to polyimide film compared with prepreg |
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Merits for surface mounting contributed good dimension stability, strength of surface mounting area and coplanality. (Assembly Yield Up) |
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Good heat resistance compared with standard prepreg because of higher Tg |
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Halogen free products considering environmental friendly |
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In case that bonding sheet was reinforced by glass cloth, usually there is affinity problem between resin adhesive and inorganic glass cloth and in such case it couldn'
t be put into practical use. However, fusion of our cultivated prepreg technology and flexible material technology including bonding sheets solved this difficulty.
In reliability test, we got good results on solder reflow test and migration resistance test, which proof products excellence. For environmental, halogen free is achieved in Super Bonding Sheet.
(We have development and sales results, as we were the pioneers for halogen free technology in the world.)
We have already claimed the patent.
Our customer has been qualifying Super Bonding Sheet and partially they start to use it.
Production is in Kawaguchi Plant and we are targeting 3 billion yen (Yearly) after 5 years. |
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