HD120 envelope pasting machine has the following features: 1. air suction bottom paper extracting is available to feed paper constantly without pause. 2. air suction roller and barrier system accomplish double fold correctly and quickly. 3.rotary paste feeding is suitable to convert envelope size swiftly and stick paper bags. 4.vertical folding device can accomplish the precise folding upon envelope tongue. 5. electronic counter may control finished products by group for easy package.