After Companies Amendment Act 2006, No director can be appointed or reapponted as director unless he has obtained DIN. (Refer proviso to Section 253 of Companies Act 1956)
In view of this, A director can not be appointed by board or in AGM without having DIN and therefore he cannot sign the documents. However appointment can be done after obtaining DIN and the director can sign document on behalf of the company though FORM 32 can be filed later.
28 June 2011
Now a days everything is online and till the director gets his DIN Number as well as his digital signature he cannot sign any document of the company. Getting DIN Number and digital signature is also not material but the same is to be approved by the ROC then only the newly appointed director can sign.