Abstract:
A mask film (2a) wherein a squeegee cleaning portion (6) is formed in advance in a certain position and another mask film (2b) are respectively bonded to the opposed surfaces of a substrate material. Then a through hole (3) is formed by a laser, and the through hole (3) is filled with a conductive paste (4) by squeegeeing. Consequently, the paste is prevented from remaining on top of the through hole (3), so that there can be obtained a circuit board having excellent connection quality.
Abstract:
A method of manufacturing a reuse paste includes preparing a fiber piece housing paste, producing a filtered recovery paste, and producing a reuse paste. In the preparing of the fiber piece housing paste, a conductive paste including a conductive particle, resin and a latent curing agent, and a fiber piece housing paste including a fiber piece dropping off from a prepreg used for manufacturing a circuit board are prepared. In the producing of the filtered recovery paste, the filtered recovery paste is produced by filtering the fiber piece housing paste, which remains in a paste state, by using a filter. In the production of the reuse paste, the reuse paste is produced by adding at least one of a solvent, resin, and a paste having a different composition from that of the filtered recovery paste into the filtered recovery paste.