Molding device and molding method

A molding method, comprising:

• providing a mold, wherein the mold includes a mold cavity, an feeding port in communication with the mold cavity, and a junction point in connection with the mold cavity, wherein the mold cavity is defined by an inner top wall, an inner bottom wall and an inner sidewall between the inner top wall and the inner bottom wall, the feeding port is disposed at the inner top wall;
• sensing a pressure in the mold cavity, and injecting a gas into the mold cavity through the junction point until the mold cavity is sensed to have a first predetermined pressure;
• sensing the pressure in the mold cavity and injecting a mixture from the feeding port into the mold cavity having the first predetermined pressure through the feeding port;
• and
• discharging a portion of the gas from the mold cavity through the junction point when the injection of the mixture is accomplished.