Use FM RKD_WORD_WRAP. It preserves the word, and splits the string based on the size given in the importing parameter and exports output to the table.
data : input type string.
DATA: lines(132) OCCURS0WITHHEADERLINE.
CALLFUNCTION'RKD_WORD_WRAP'
EXPORTING
textline = input
OUTPUTLEN = 10
TABLES
OUT_LINES = lines.