The difference between blown glass bottles and pressed glass bottles

The so-called blown glass bottles or pressed glass bottles are based on the forming process of glass bottles.
The forming of glass bottles is to transform molten glass into solid products with a fixed shape. Forming must be carried out within a certain temperature range. This is a cooling process. The glass first changes from a viscous liquid state to a plastic state, and then into a brittle solid state. Forming methods can be divided into two categories: artificial forming and mechanical forming.
Artificially shaped. (1) Blowing, using a nickel-chromium alloy blowpipe, picking a ball of glass and blowing it while turning it in the mold. It is mainly used to form glass bubbles, bottles, balls (for scratching glasses), etc. (2) Drawing, after blowing into small bubbles, another worker sticks it with the top plate, and the two are blowing and pulling, which is mainly used to make glass tubes or rods. (3) Pressing, pick a group of glass, cut it with scissors and drop it into the die, and then press it with the punch. Mainly used to form cups, plates, etc. (4) Free forming, after picking materials, use pliers, scissors, tweezers and other tools to directly make handicrafts.
mechanical forming. The intensity of labor is big, because artificial forming temperature is high, the condition is poor, so, except the free forming, most have been replaced by mechanical forming. In addition to pressing, blowing, and drawing, mechanical forming also has (1) calendering, which is used to produce thick flat glass, engraved glass, and wire glass. (2) Casting method to produce optical glass. (3) The centrifugal casting method is used to manufacture large-diameter glass tubes, utensils and large-capacity reaction pots. This is to inject molten glass into a high-speed rotating mold, and the centrifugal force makes the glass stick to the wall of the mold, and the rotation continues until the glass hardens. (4) Sintering method, used to produce foam glass. It is to add a foaming agent to the glass powder and heat it in a metal mold with a cover. During the heating process, the glass will form a lot of closed bubbles. It is a very good heat insulation and sound insulation material. In addition, the forming of flat glass has vertical pull method, flat pull method and float method. The float method is a method of letting the glass flow float on the surface of molten metal (tin) to form flat glass. Its main advantages are high quality glass (flat, bright and clean), fast pulling speed and large output
The difference between a blown glass bottle and a pressed glass bottle is that the bottle mouth has a rim is a blown bottle, and the one without a rim is a pressed bottle, like a drinking cup, which is pressed. Look closely at the pressed cup with countless halos. That's the mold pressed halo, the blown ones don't.

Post time: Dec-30-2022