Mouthblown glassware,mainly use borosilicate glass tube,the specifications are different according to different products weight and size.
Take glass teapot for example, if the diameter is 120mm, we choose glass tube with diameter 65 mm and thickness 3.2mm.
Borosilicate glass is a special glass material with low expansion rate, high temperature resistance, high strength, high hardness, high light transmittance and high chemical stability.
It can withstand the high temperature 120℃ instantly;to compare with common glass,let's do a heat resistance experiment.
1) Take out the common and borosilicate glass cup in the freezer 2) Quickly pour them into boiling water at 100℃ 3)Common glass cup was instantly burst while the borosilicate glass cup was safe.
It is a process in which the glass is heated and softened and then reformed, and borosilicate glass melting point is 1800℃.
The Frist Step Drawig
Put the long glass hollow tube on the flame nozzle, and heat the glass tube to make it soft while rotating, then continuously stretched into filaments to cut off into small pieces.
The Second Step Blow Molding
Insert the drawn short tube into one end of the hollow blow tube, and heat the other end to cut off by drawing.
Blow into the short glass tube slowly and evenly through the hollow blowpipe, so that the short glass tube expands gradually to a bubble, and then put it in the special mold
Quickly and evenly blow and rotate rapidly the short tube until the material bubble props the entire mold. Check the bubble material before going into next step.
The Third Step Lead The Mouth
Insert one end of teapot mold into the hollow blow tube, then heat the position of the spout and one end of the auxiliary-assisted glass tube, and after it becomes soft, stick the glass rod to the spout position.
While pulling and blowing through the blowpipe, the glass rod will form an empty tube in the pulling direction. The spout will come out like a "Z". The process really required skilled blowing engineers.
The Fourth Step Shape The Top Mouth
Put the teapot on a knife type flame sprayer and heat while being rotated until it is removed
Then continuing heating and rotating to make the incision smooth and uniform.
The Fifth Step Install Handle and Make Lid
The Sixth Step Annealing
Using a professional annealing furnace, the temperature can reach 800℃. Teapots go through the annealing furnace uniformly, the entire teapot body is evenly heated.
The Seventh Step Inspection and Clean
The Last Step Packing