How can I properly preserve the freshness of raw cabbage by freezing it?

To properly preserve the freshness of raw cabbage by freezing it, first wash and chop the cabbage into desired pieces. Blanch the cabbage in boiling water for 1-2 minutes, then quickly cool it in ice water. Drain the cabbage thoroughly, pack it into airtight containers or freezer bags, and remove as much air as possible before sealing. Label the containers with the date and store in the freezer for up to 12 months.