Hengxing 3-Station Positive & Negative Pressure Thermoforming Machine The Hengxing 3-Station Positive & Negative Pressure Thermoforming Machine is engineered for automated production of biodegradable food containers, eco-friendly lunch boxes, food trays, bowls, and compartment containers from suitable thermoforming sheets. This advanced system integrates heating, positive and negative pressure forming, cutting, and stacking into a seamless automated process, making it ideal