As a professional cosmetic bottle manufacturer, we know that plastic bottles are part of the rubber and plastics industry. Whatever plastic bottle is used, it must be formed. In fact, whether it is a cosmetic bottle or another plastic bottle, it is the same production method.
The molding process of plastic bottles is the process of making plastic products from polymers such as phenolic resins, urea resins or unsaturated polyester resins. Explained by plastic bottle manufacturers-its processing methods include compression molding, extrusion molding, injection molding, blow molding and calendering.
There are many ways to make polyethylene. The most common 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 soft texture, and has high stability to sunlight, air, moisture, and chemical agents, so no stabilizer or plasticizer is required, and most stabilizers and plasticizers are toxic Or highly toxic.
First, warm up
The preform is irradiated with a high temperature lamp to soften and soften the body part of the preform. In order to maintain the shape of the bottle mouth, it is not necessary to heat the preform opening, so a certain cooling device is required to cool it.
Second, blow molding
In this stage, the pre-heated preform is put into a prepared mold and inflated therein to blow the preform into the required bottle.
Blow molding machines on the market are usually divided into fully automatic and semi-automatic. The automatic blow molding machine combines the two operations of bottle blowing through the operation of the robot, without the need to manually put the preheated preform into the mold. The production speed has greatly accelerated, and of course the price is higher than semi-automatic.
Injection
Injection molding is also called injection molding. Injection molding is a method of injecting a thermoplastic melt into a mold under high pressure using an injection molding machine (or an injection machine) to obtain a product by cooling and solidification. 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 the high equipment and mold costs and the difficulty in cleaning the injection molding machine.
Calender
Calendering is a process in which the resin is processed (kneaded, filtered, etc.) into a film or sheet through the gap between two or more opposing calender rolls, and then peeled from the calender rolls. , Cooling and forming method. Calendering is a molding method mainly used for polyvinyl chloride resins, and can make films, sheets, sheets, artificial leather, floor tiles, and the like.
Ningbo RuiChang Commodity Packaging Co , Ltd . is a Plastic Bottle Manufacturer from China. We manufacture and supply plastic bottle products that are safe and environmentally friendly for cosmetics and daily use packaging. Our products are exported to Europe and Southeast Asia, and have been well received by customers. Click our website for more product details and information: https://www.ruichangpacking.com