HP-250B Model Pocket Envelope Making Machine, an important standard model in our series, is designed mainly for the production of large and medium-size envelopes, Similar to other models,HP-250D model is characterized by its high efficiency, stable function, easy operation, quick adjustment and little space occupation. It is suitable attention to the needs of processing thick paper. By means of a sucher the lower most blank of the pile on the feed plate is fed into the machine, in this way the pile of blank can be replenished while the machine is operating Assisted by suction cylinder. the fence folding unit carries out the folding with high speed and accuracy. The width of envelope or flat bag can be reset while the machine is running. Rotary glue applying unit guarantees the even distribution of glue. The operation of clearing is easy. The machine is also equipped with finished envelope’(flat bags)counting and batching processing thick paper unit.