With specialized devices and high speed folding machines, thousands of pages after being printed will be fold and insert into the envelopes, especially with multiple pages capacity in one envelope.
Folding and inserting machine is able to fold up to 6 sheets of A4, attach with 2 flyers in one envelope. When using paper and envelope size 70gsm and 80gsm, the capability of one machine is 5,000 mails/hour.
Step 1: Folding papers and inserting into the envelope.
Step 2: Sealing the envelope with glue to complete.