Multiple TDLINE generation in PI

Hi experts,ed through

Non SAP system is sending long text description and PI has to split multiple TDLINE each of max size 70 char.These we have  achieved through java udf.

TDFORMAT field is set to constant "=".The issue in SAP Idoc header text is if the 70 th/140/210 th char is space,2 words are combined together without space.How to fix this issue in PI?

Regards,

Karthiga