Envelopes and postal express delivery envelopes are actually small paper bags, and the bag making process for flat paper bags and envelope bags in low consumption paper bags is carried out using specialized envelope machines. The processing of envelopes or postal express delivery envelopes is basically carried out according to the following process.

Confirm the envelope size with the user and select the corresponding paper. After computer-generated design, implementation of sampling, and verification of size and effectiveness, the evaluation and selection of envelopes are carried out. After determining the envelope processing factory, the sample needs to be handed over to the printing factory for signing a processing agreement, which includes delivery time, product quality requirements, quantity of printed materials, etc.