The uneven thickness of glass bottles in cosmetic containers can easily lead to damage or be crushed by contents under severe cold conditions. Reasonable capacity should be tested during filling. Paper holders should be used in transportation and separated individually. Colored boxes should be equipped in products. Inner brackets and middle boxes can be more vibration-proof.

1. Ingredients, according to the designed material list, weigh all kinds of raw materials and mix evenly in a mixer. The main materials of glass are quartz sand, limestone, feldspar, soda ash, boric acid, etc.

2. Melting, the prepared raw materials are heated at high temperature to form uniform glass liquid without bubbles. This is a very complex physical and chemical reaction process. Glass is melted in a furnace. There are two main types of melting kilns: one is crucible kiln, in which glass is stored and heated outside the crucible. A small crucible kiln has only one crucible, and a large crucible can have as many as 20 crucibles. Crucible kiln is a gap type production, now only optical glass and color glass are produced by crucible kiln. The other is a tank kiln, where the glass material is melted in the kiln and the open fire is heated on the top of the liquid glass. The melting temperature of glass is mostly 1300-1600 C. Most of them are heated by flame and a few by electric current. They are called electric melting kilns. Now, the kilns are continuous production, small kilns can be several meters, large can be more than 400 meters.

3. Forming is the transformation of melted glass into solid products with fixed shape. Forming must be carried out within a certain temperature range. This is a cooling process. Glass is transformed from viscous liquid to plastic state and then to brittle solid state. Forming methods can be divided into artificial forming and mechanical forming.

A. Artificial forming. There are (1) blowing, with a nickel-chromium alloy blowing pipe, pick a group of glass in the mold while blowing. Mainly used for forming glass bubbles, bottles, balls (for glasses) and so on. (2) Drawing. After blowing into bubbles, another worker sticks to the top plate. While blowing, the two are mainly used to make glass tubes or rods. (3) Press, pick up a mass of glass, cut it with scissors and drop it into the die, then press it with the punch. Mainly used for forming cups, plates, etc. (4) Free forming. After picking up the material, the handicraft products are directly manufactured with tools such as pliers, scissors and tweezers.

B. Mechanical forming. Because of the high labor intensity, high temperature and poor condition of artificial forming, most of them have been replaced by mechanical forming except free forming. In addition to pressing, blowing and drawing, mechanical forming also has (1) calendering method, which is used to produce thick flat glass, engraved glass, glass with metal wire, etc. (2) Casting method to produce optical glass. (3) Centrifugal casting is used to manufacture large diameter glass tubes, utensils and large capacity reaction pots. This is to inject glass melt into a high-speed rotating die. The centrifugal force causes the glass to adhere to the wall of the die, and the rotation continues until the glass hardens. (4) sintering process is used to produce foam glass. It is added foaming agent in glass powder, and heated in covered metal mould. During the heating process, glass forms many closed bubbles, which is a good insulation and sound insulation material. In addition, flat glass is formed by vertical pull-up method, flat pull method and float method. Floating method is a method of forming flat glass by floating liquid glass on the surface of molten metal (tin). Its main advantages are high quality of glass (smooth and smooth), fast drawing speed and large output.

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