No. Audio CDs do not contain information about track titles, artist, etc. When you import a CD into iTunes an online service (Gracenote) is used to look up these details based on parameters that can be derived from the disc (no. of tracks, track lengths, checksums). Gracenote will find a match for the CD and return details of artist, album name, song titles, etc. from the information stored in its database.
Even if the CD you are creating is a "duplicate" of a commercial album release, matching in Gracenote is going to occur only if you've initially ripped and then stored media in uncompressed ("WAV") format - and even that is not a guarantee of success. If your iTunes media is in m4a or mp3 format, and/or the disc you've created is a compilation of your own choosing, Gracenote will not be able to make a match - hence the "unknown"s show in iTunes if you re-import.
Given, however, that you must have the media in your library to create the CD, why would you want or need to re-import it?