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Milliken Chemical Company of the United States has launched ClearShield, a UV absorbent for polyester (PET) bottles, which is a homogeneous liquid polymer specially used in PET packaging that can block all ultraviolet rays within 390nm. The product is easy to use, can be used directly, does not require further compounding into liquid or solid masterbatches, and can be added with the resin at molding time or during the preforming stage. When adding ClearShield's PET, injection and blow molding without dirt staining the equipment and without delaying production time. This product is a transparent polymer that does not affect the transparency, gloss and bottle quality of PET bottles, and has been approved by the US Food and Drug Administration (FDA) for most food and beverage packaging.
The development of plastic polymerization technology will inevitably have a significant impact on the protection of food or beverages. First, food plastic packaging is favored There are data showing that the amount of plastic used for food packaging accounts for 1/4 of the total output of plastics, it can be said that as soon as the plastic used for food packaging appears, there is garbage. In supermarkets and shopping malls, many food packaging is made of plastic. The plastic inflatable packaging of puffed food can prevent moisture, anti-oxidation, preserve fragrance, block sunlight, and prevent being squeezed, but such a large packaging is a great waste of resources; There is also the packaging of instant noodles, plastic packaging is far more than paper bowl (or barrel) packaging, the sales price of bowls or barrels of instant noodles on the market is generally higher than 1/3 of the sales price of the same quality bagged instant noodles. Because this packaging method is convenient to eat, especially when traveling, it can be eaten directly in hot water after opening the lid, and there is no need to bring other containers, so it is very popular with consumers.
With the improvement of people's living standards, new packaging technologies, products and materials continue to emerge. However, most of the new food packaging popular in the US market is mainly plastic packaging, which is mainly based on high-temperature sterilization plastic tanks, high-barrier material food packaging, aseptic packaging, flexible packaging materials and container packaging. In the beverage market, plastic bottles, especially PET bottles, are the most important and eye-catching packaging. In the carbonated beverage, water, beer market, there is no market for paper packaging; In the juice market, paper composite containers have a relatively close market share compared to plastic containers; PET bottles have appeared in the liquor market, such as the Jianzhuang wine produced by Wuliangye Group, which has all used PET plastic bottles. Plastic beer bottles are also in full swing, and there are already products on the market in the United States and Europe. Plastic bags of soy sauce have also appeared, plastic barrels of soy sauce, vinegar, etc. have broken the dominance of glass bottles. Small packaging such as monosodium glutamate and pepper is basically the market for plastic bags, and paper packaging is rarely used.
At present, there are several types of plastics used in beverage packaging:
One is polyethylene (PE); PE is the world's highest production synthetic resin, and it is also a plastic packaging material with relatively large consumption. Polyethylene products are divided into three types: low density, medium density and high density. Among them, high-density polyethylene (HDPE) has a high degree of crystallinity, its hardness, air tightness, mechanical strength, chemical resistance are better, so it is widely used blow molding to make bottles and other hollow containers. Taking advantage of the good heat sealing performance of PE, the container made of various composite materials produced can hold various beverages such as lemon juice and fruit juice.
Second, polyvinyl chloride (PVC) :P VC can be roughly divided into three categories: hard products, soft products and paste products. PVC bottles produced by injection and blowing method seamless line, bottle wall thickness and uniformity, can hold carbonated beverages such as Coca-Cola, soft drinks, etc., PVC bottles produced by extrusion blow molding method are only suitable for containing juice and mineral water.
The third is polypropylene (PP): because of its high transparency, smoothness and good processability, it can be compounded with other materials to make a variety of beverage packaging containers. The fourth is polyester (PET or PETP): PET bottles produced by two-axis extension blow molding method, with good transparency, high surface gloss, glass-like appearance, is the most suitable plastic bottle to replace glass bottles. In recent years, China's PET bottle production has developed rapidly, and is widely used in various tea drinks, juices and other beverages that need to be hot-filled. It is now also used in Coca-Cola packaging. Fifth, polyvinylidene chloride (PVDC): this material is characterized by softness and extremely low breathability, water permeability, good freshness and fragrance retention, and is a better heat shrinkable packaging material. Cellophane is coated with PVDC and then compounded with PE, and is often used to package orange juice.
At present, the development trend of newly developed plastic packaging films at home and abroad is to develop in the direction of high performance, non-toxic and harmless, green environmental protection, high quality and low price, and easy to use. Among them, flexible packaging materials have been further developed from food packaging in the past to non-food packaging fields such as industrial packaging, pharmaceutical packaging, building materials packaging, and cosmetic packaging, and their scope of use and dosage will become larger and larger.
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