A semi automatic bottle blowing machine serves as core equipment for plastic bottle production, balancing manual operation and mechanical automation to complete bottle molding processes. Unlike fully automated units, this machine relies on human assistance for material loading and finished product unloading, while automating heating, stretching and air blowing procedures. The whole production workflow starts with plastic preform placement. Operators place qualified PET preforms into the heating tunnel of the semi automatic bottle blowing machine, where infrared heating elements deliver uniform heat to soften the plastic material steadily. Temperature control stands vital here, as moderate softening ensures smooth stretching without material deformation or damage. After heating, workers transfer the softened preforms into closed mold cavities. The machine then triggers automatic stretching rods to elongate the preforms vertically, followed by high-pressure air injection to expand the plastic evenly against the mold inner walls. A short cooling phase helps the plastic solidify into fixed bottle shapes. Once cooling finishes, the mold opens automatically, and operators take out finished bottles for subsequent quality checks. This man-machine collaborative mode simplifies complex production steps, lowers operational thresholds, and maintains stable molding quality for daily small and medium-batch production tasks.