(1) Blow-blow method
This method is mostly used to cut small bottles. Vacuum-assisted forming can also be used in the initial die of EF type row machine.
The so-called blowing-blowing method is to blow once in the initial die, so that the mouth is formed and blown into embryonic form, and then transferred into the forming die for the second blow forming.
According to the different ways of feeding, it can be divided into two kinds of blow-blow moulding: vacuum suction and trichotomy feeding.
(2) Transfer blowing method
It refers to the continuous rotation of blowing bubbles.
In the switching blowing method, vacuum suction method is used to feed, which sucks out the glass liquid from the retaining brick, shears and falls into the forming die. The swivel claw will quickly clamp and then rotate and complete a series of actions such as blowing. This method is suitable for the manufacture of larger size instruments.
(3) Belt blowing method
With liquid flow feeding, the glaze liquid is continuously flowing out from the leaking hole, rolled into strips through the drum, and then formed an air bubbles on the transmission chain by self-weight and air-flushing, and then blown into shape by the rotating forming die closure.
The belt blowing method is mainly used to produce bulb shells and tea cups, and has a large production capacity. It was first invented and applied to industrial production by Corning Glass Company of the United States. The cooker production developed by Corning Company in the future almost made use of this principle.
(4) Pressure-blow method
Droplets are pressed in the primary die to form the mouth, and then transferred to the forming die to be blown into shape.
Pressure-blow moulding is easy to make the wall thickness of products evenly distributed, so it is mainly used to produce hollow glass products such as wide-mouth bottles. At present, some factories also use this method to produce small-mouth bottles.
