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The difference between blown glass bottles and pressed glass bottles
Jan 07, 2019

    The glass bottle is formed by converting a molten glass liquid into a solid product having a fixed shape. Forming must be carried out within a certain temperature range. This is a cooling process. The glass is first transformed from a viscous liquid to a plastic state and then converted into a brittle solid state. Forming methods can be divided into two types of artificial forming and mechanical forming.


A. Artificial shaping. (1) Blow, use a nickel-chromium alloy torch, pick a glass of glass while blowing in the mold. Mainly used to form glass bubbles, bottles, balls (for eyeglasses used) and so on. (2) After drawing, after the blister is blown, another worker sticks with the top plate, and the two are blown while pulling to make glass tubes or rods. (3) Pressing, picking up a bunch of glass, cutting it with scissors to drop it into the die, and pressing it with the punch. Mainly used to form cups, plates and so on. (4) Free forming, picking materials directly after the use of pliers, scissors, tweezers and other tools made of handicrafts.


B. Mechanical forming. Because of the high labor intensity, high temperature, and poor conditions of artificial forming, most of them have been replaced by mechanical forming except for free forming. In addition to pressing, blowing, and drawing, mechanical forming includes (1) calendaring methods for the production of thick flat glass, cut glass, and sandwiched wire glass. (2) Casting method, producing optical glass. (3) Centrifugal casting method for manufacturing large-diameter glass tubes, vessels, and large-capacity reaction pots. This is to inject the glass melt into a mold that rotates at a high speed. The glass is pressed against the mold wall due to centrifugal force, and the rotation continues until the glass hardens. (4) Sintering method for producing foamed glass. It is added in the glass powder blowing agent, heated in a covered metal mold, the glass in the heating process to form a lot of closed air bubbles This is a good insulation, sound insulation material. In addition, the flat glass is formed by vertical pull, flat pull and float. Floatation is a method of floating a glass stream on the surface of a molten metal (tin) to form a plate glass. Its main advantages are high quality (flat, smooth) glass, high pull speed, and high yield.


    The difference between blown glass bottles and pressed glass bottles is that blown bottles are on the edge of the bottle, and pressed bottles on the edge, like cups that drink water, are compressed. Look carefully at the countless cups that have a halo. That's the halo of the die pressure. No blowing.



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