PTF-WG series is a new-generation automatic western style paper bag machine designed and developed by our company after absorbing advantages of its like in foreign countries, which has functions of window opening, film posting, mouth glue coating, drying and folding etc. Our company has become the one of fewer companies to produce such an integrated and automatic envelope machine after W+D, Germany and F.L.SMITH, USA in the world, which fills the gap in the country and most technical items of the machine are at leading position in the country. The machine has become the first choice to substitute the imported equipment for all large-scale envelope manufacturers. Its main characteristics are as follows: all work stations can be integrated freely and it is easily adjusted and operated with high speed and efficiency.