Knowledge

Characteristics of various plastics commonly used in cosmetic plastic containers



When choosing plastic containers for cosmetics, it is quite advantageous to have a general 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 quality of cosmetic plastic containers determines the basic characteristics of cosmetic plastic containers. Cosmetic plastic containers with the same or similar shape may have extremely different performance due to different materials. For example, both polycarbonate blow bottles and ordinary polyester stretch blow bottles have very good transparency and gloss, and are very similar in appearance, but polycarbonate bottles have outstanding high temperature resistance (can withstand high temperature sterilization above 120 C), but poor barrier performance; while ordinary polyester stretch blow bottles have poor barrier performance. Yes, but the heat resistance is poor (generally recommended at temperatures below 60 degrees Celsius).

General plastics generally refer to plastics with high yield, wide use, good formability and low price. General purpose plastics have five varieties, namely polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS) and acrylonitrile-butadiene-styrene copolymer (ABS). These five kinds of plastics occupy the vast majority of the use of plastic raw materials, the rest can be classified into special plastics, such as: PPS, PPO, PA, PC, POM, etc., they are rarely used in daily life products, mainly used in the engineering industry, defense technology and other high-end areas, such as automotive, aerospace, construction, communications, etc. Field. Plastics can be classified into thermoplastic and thermosetting plastics according to their plasticity. Typically, thermoplastic products can be recycled, while thermosetting plastics can not, according to the optical properties of plastics, can be divided into transparent, translucent and opaque materials, such as PS, PMMA, AS, PC, etc. are transparent plastics, and most other plastics are opaque plastics.

Cosmetic plastic containers

The main characteristics of plastics are: first, low density, high specific strength, you can get a higher packaging yield, that is, "unit mass of the packaging volume or size of the packaging area. Secondly, most plastics have good chemical resistance, good acid and alkali resistance, all kinds of organic agents, long-term storage, no oxidation. Third, it is easy to shape, and the energy consumption of molding is lower than that of steel and other metal materials. Fourth, it has good transparency and easy coloring. Fifth, it has good strength, high strength per unit weight, impact resistance and easy modification. Sixth, low processing cost. Seventh, excellent insulation.

Plasticizer can increase the plasticity and softness of cosmetic plastic container, reduce the brittleness, and make the plastic easy to process. Plasticizers are generally high boiling point organic compounds which can be miscible with resins, non-toxic, odorless, stable to light and heat, commonly phthalate esters. For example, in the production of PVC plastics, soft PVC plastics can be obtained by adding more plasticizers, and rigid PVC plastics can be obtained if plasticizers are not added or less (dosage < 10%).

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