When choosing cosmetic plastic containers, it is quite advantageous to have a rough understanding of various molding methods. The characteristics of various plastics commonly used in cosmetic plastic containers are very important for the correct selection of cosmetic plastic containers, because the material of cosmetic plastic containers determines the basic characteristics of cosmetic plastic containers. Cosmetic plastic containers with the same or similar shapes may have extremely large differences in performance due to different materials. For example, polycarbonate blow molded bottles and ordinary polyester stretch blow molded bottles have extremely good transparency and gloss, and are very similar in appearance, but polycarbonate bottles have outstanding high temperature resistance (can be Withstand high temperature disinfection above 120℃), but the barrier performance is poor; while ordinary polyester stretch blow molding bottles have good barrier performance, but poor heat resistance (generally recommended for use at temperatures below 60°C).
General-purpose plastics generally refer to plastics with large output, wide use, good formability, and low prices. There are five types of general plastics, namely polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS) and acrylonitrile-butadiene-styrene copolymer (ABS). These five types of plastics account for the vast majority of plastic raw materials, and the rest can basically be classified into special plastics, such as: PPS, PPO, PA, PC, POM, etc., they are used in daily life products very little, mainly It is applied in high-end fields such as engineering industry, national defense technology, etc., such as automobile, aerospace, construction, communication and other fields. Plastics are classified according to their plasticity and can be divided into thermoplastics and thermosetting plastics. Under normal circumstances, thermoplastic products can be recycled, while thermosetting plastics cannot. According to the optical properties of plastics, they can be divided into transparent, translucent and opaque raw materials, such as PS, PMMA, AS, PC, etc. which are transparent plastics , And most other plastics are opaque plastics.
The main characteristics of plastics are: First, the density is small, the specific strength is high, and a higher packaging yield can be obtained, that is, "the packaging volume or packaging area per unit mass. Second, the chemical resistance of most plastics is good. Good acid and alkali resistance, resistance to various organic agents, long-term storage, no oxidation. Third, it is easy to shape, and the required energy consumption is lower than that of metal materials such as steel. Fourth, it has good transparency and is easy to color. Fifth, it has good strength, high strength per unit weight, impact resistance, and easy modification. Sixth, low processing cost. Seventh, excellent insulation.
Plasticizers can increase the plasticity and flexibility of cosmetic plastic containers, reduce brittleness, and make plastics easier to process and shape. Plasticizers are generally high-boiling organic compounds that are miscible with resin, non-toxic, odorless, and stable to light and heat. Phthalate esters are commonly used. For example, in the production of polyvinyl chloride plastics, if more plasticizers are added, soft polyvinyl chloride plastics can be obtained; if no or less plasticizers are added (amount <10%), rigid polyvinyl chloride plastics can be obtained .
　 Due to the inability of natural degradation of plastics, it has now become the number one enemy of mankind. It has also led to many animal tragedies. For example, the monkeys, pelicans, dolphins and other animals in the zoo will accidentally swallow the No. 1 plastic bottle that tourists throw away, and then die painfully due to indigestion; when I look at the beautiful and pure sea, I approached it, and it was actually full of them. All kinds of plastic garbage that could not be contained in the ocean, in the intestines of many dead seabird samples, all kinds of indigestible plastic were found.

Posted by: bottlempactes at 03:23 AM | No Comments | Add Comment
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