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Neither calibre, nor your Sony's internal PDF viewer, nor anything else can "reflow" an image-based PDF, which is typically what you get after scanning. Converting to LRF won't change anything either.
Acrobat and other software could "OCR" the scans to convert them from images to text, and then you could convert it it to RTF or HTML, etc., and put that into Calibre. Whether it'll work out well depends on a lot of factors, including the quality of the source, whether it's plain text, or has a lot of (mathematical or other) symbols, etc., and the quality of the OCR routine.
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