Apparatus for substrate double-surface hole-filling

A substrate double-surface hole-filling apparatus for carrying out a hole-filling operation on a substrate, comprising:

• a first feeder,
• a first scraping device,
• a first dryer,
• a second feeder,
• a second scraping device,
• a second dryer, and
• a turnover device,
• wherein:
• the first feeder and the first scraping device are positioned on the same side of a first surface of the substrate;
• the second feeder and the second scraping device are positioned on the same side of a second surface of the substrate;
• the first feeder is configured to add a packing material for hole-filling to a planar region of the first surface of the substrate;
• the first scraping device fills the packing material added to the first surface of the substrate to concave holes or pits of the first surface of the substrate;
• the substrate filled with the packing material is dried by the first dryer, wherein the first dryer is positioned on an opposite side of the substrate from the first feeder;
• the turnover device turns over the substrate from a state which the first surface faces the first feeder to another state which the second surface faces the second feeder;
• the second feeder is configured to add the packing material for hole-filling to a planar region of the second surface of the substrate;
• the second scraping device fills the packing material added to the second surface of the substrate to concave holes or pits of the second surface of the substrate;
• the substrate filled with the packing material is dried by the second dryer, wherein the second dryer is positioned on an opposite side of the substrate from the second feeder;
• the first scraping device and the second scraping device directly contact the substrate;
• the first scraping device is positioned downstream of the first feeder opposite the first dryer;
• the second scraping device is positioned downstream of the second feeder opposite the second dryer;
• the first feeder and the second feeder are configured to drip or coat the packing material on the substrate;
• the first scraping device and the second scraping device are each one of a flexible squeegee, a steel scraper, or a combination thereof;
• the turnover device comprises a plurality of turnover rollers and guiding wheels;
• at least two of the turnover rollers are provided downstream of the first dryer and upstream of the second dryer, wherein a first of the at least two turnover rollers is in contact with the first surface of the substrate, and wherein a second of the at least two turnover rollers is in contact with the second surface of the substrate opposite the first surface of the substrate;
• the first scraping device and the first dryer are positioned on opposite sides of the substrate such that scraping and drying of the substrate with the first scraping device and the first dryer occur at least partially simultaneously;
• and
• the second scraping device and the second dryer are positioned on opposite sides of the substrate such that scraping and drying of the substrate with the second scraping device and the second dryer occur at least partially simultaneously.