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There are ready-made banner fabrics on the market. To print words, you need to buy pigments (usually white and yellow) from the place where advertising consumables are sold, then use a engraving machine to engrave the words you want on the post-it notes, stick them on the screen, hollow out the middle of the words, then put the screen version on the banner, evenly paint them and dry them.
Making self-adhesive stickers is relatively simple. Just buy a self-adhesive sticker and carve it directly with a carving machine. Generally, it is machine printing, which is characterized by random design of patterns, environmental protection, tasteless, washable, rich in colors and fine workmanship.