As a professional cosmetic bottle manufacturer, we know […]
As a professional cosmetic bottle manufacturer, we know that plastic bottles are part of the rubber and plastics industry. No matter what plastic bottles, they must be shaped. In fact, no matter whether it is a cosmetic bottle or any other plastic bottle, it is the same production method.
The molding process of the plastic bottle is a process of making a plastic product from a polymer such as a phenol resin, a urea resin, or an unsaturated polyester resin. Recently, there are often friends who are concerned about the processing methods of plastic bottles. In fact, since the current cosmetic bottles are made of PETG materials, the production enterprises and plastic bottles are similar. Today, Xiaobian said that its processing methods include compression molding, extrusion molding, injection molding, blow molding, and calendering.
There are many ways to make polyethylene. The most common one is to polymerize ethylene at a high temperature of 200 to 300 ° C and a pressure of 1000 to 2000 atmospheres. In polyethylene, no other substances are doped. The polyethylene thus obtained has a low density and a soft texture, and has high stability against sunlight, air, moisture and chemical agents, so that no stabilizer or plasticizer is required, and most of the stabilizers and plasticizers are Toxic or highly toxic.
The preform is irradiated by a high temperature lamp to soften and soften the body part of the preform. In order to maintain the shape of the bottle mouth, the preform opening does not need to be heated, so a certain cooling device is required to cool it.
Second, blow molding
In this stage, the preforms that have been preheated are placed in a mold that has already been prepared, and a high pressure is inflated therein to blow the preform into a desired bottle.
Blowing machines on the market are generally divided into fully automatic and semi-automatic. The automatic blow molding machine combines the two operations of the blowing bottle by the operation of the robot, eliminating the need to manually put the preheated preform into the mold. The rate of production is greatly accelerated, and of course the price is higher than semi-automatic.
Plastic bottle processing method:
1, injection molding
Injection molding is also called injection molding. Injection molding is a method in which a thermoplastic melt is injected into a mold under high pressure using an injection molding machine (or an injection machine) to obtain a product by cooling and solidifying. Injection molding can also be used to form thermoset plastics and foams. The advantages of injection molding are fast production speed, high efficiency, automatic operation, and the ability to form parts with complex shapes, especially for mass production. The disadvantages are high equipment and mold costs, and it is difficult to clean the injection molding machine.
Calendering is the process of processing (kneading, filtering, etc.) the resin into a film or sheet by the gap between two or more opposite rolling rolls of a calender, and then peeling off from the calender roll. , a molding method that is cooled and shaped. Calendering is a molding method mainly used for polyvinyl chloride resins, and can manufacture films, sheets, sheets, artificial leathers, floor tiles and the like.