PET bottle new knowledge introduction

Currently, the PET bottle market is looking for a total solution that can reduce the cost of barriers, be easy to process, and at the same time not reduce transparency and facilitate recycling. New additives and barrier resins will cater to these market demands. In addition, other additives such as ultraviolet shielding agents, antistatic agents, scenting agents, and odor control agents also play a role in meeting market demand. Market applications for PET bottles include beverage bottles, food packaging and non-food packaging such as personal care products. Fred Gastrock, an analyst at Townsend in the United States, predicts that the total sales of PET bottles this year will increase by 5 to 6 percentage points on the basis of 6 billion pounds in 2004. The application of PET bottles in the field of beer packaging is not much, only 0.25~. 0.30 billion pounds, but it is expected to increase by 25-30%. Gastrock also analyzed the application prospects of PET bottles in packaging fields such as food packaging, non-food packaging, drinking water bottles and sports beverage bottles. As of 2009, sales of PET bottles in these fields will increase by 8 to 10 percentage points. At the same time, he also expects that the use of PET bottles in the packaging of carbonated soft drinks (CSD) will increase by 3%. Industry experts claim that small carbonated soft drink bottles have superior barrier properties compared to 2 liters of beverage bottles, and are therefore promising in global applications. The SBA-CCI study shows that disposable small PET containers are mainly used for the manufacture of 12 small and 12-ounce-sized packaging boxes. It is expected that the use of these small packaging boxes will increase by 250% this year and will increase in the next three years. To 5 billion.

Blocking technology solutions

Increasing the barrier properties of PET bottles can extend the shelf life of substances. At present, the barrier effect is mainly increased by coating the outer layer, using an inert polymeric barrier layer, and adding an active oxygen barrier agent. For example, for carbonated beverage bottles with a very large specific surface area, the inert barrier layer keeps the carbon dioxide gas inside the bottle from escaping, and prevents oxygen from penetrating into the bottle; while the active oxygen barrier removes the bottle when it is sealed. Internal oxygen and oxygen infiltrated through the bottle wall. These active oxygen barrier agents are generally used in bottles for juice drinks and beer. The multi-layer barrier formulation combines these two barrier solutions organically, that is, a reactive oxygen barrier layer based on an inert barrier resin layer. The single-layer barrier formulation is a melt blend of nylon, active oxygen barrier, and PET resin. Most industrial experts believe that in order to meet the requirements of PET barrier properties in different application areas, it is necessary to constantly study formulas to improve barrier properties.
“ColorMatrix is ​​the only company in the world that produces and sells BP's Amosorb oxygen scavenging materials, and recently received exclusive sales of Nanocor's Imperm family of products. The Imperm series of high-barrier nylon nanocomposites are manufactured by Nanocor. The nano-clay is made of MXD6 aromatic nylon produced by Mitsubishi Chemical Co., Ltd. ("MG"), "The Imperm series of high-barrier materials can be used as the inner layer material to act as an inert barrier layer for packaging containers; while Amosorb can be used as the outer layer material to act as Reactive oxygen barrier layer; The organic combination of these two materials can be made into very high cost-effective beer bottles. McBride also pointed out that Amosorb can be used for both multilayer and monolayer barrier materials as well as for coating barrier materials. In a barrier barrier bottle, adding a small amount of Amosorb can form a safety net to prevent transport handling. During the process, the coating peeled off.ColorMatrix began production of Amosorb 100 in 2005. Compared with the standard Amosorb 4020, Amosorb 100 can reduce yellowing of regrind by 30%. The main reason for the yellowing of recycled PET (r-PET) is stickiness. Finally, McBride said that with the wide application of Amosorb, ColorMatrix will continue to make unremitting efforts for the recycling of PET barrier packaging materials. $6m H~H
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Invista's new PolyShield process technology was first introduced in 2004, and the company claims that this new process can increase the transparency and oxygen scavenging capacity of PET single-layer barrier bottles, while also improving the blending capabilities of Aramid MXD6. Aramid MXD6 can be used either as an inert barrier or as an active oxygen absorber. After being treated with PolyShield process, PET can be completely blended with MXD6 to maintain the transparency of the material. When the MXD6 and the treated PET are blended, the transition metal catalyst is added synchronously to react the active oxygen adsorbent with the MXD6; and the transition metal catalyst is more easily controlled and safer than the water vapor catalyzed MXD6. PolyShield can be used as a barrier bottle for beer and carbonated juice drinks because such packaging requires both an inert barrier and an active oxygen barrier. PolyShield has passed the European food safety certification and is actively applying for US Food and Drug Administration (FDA) 2006 safety certification. At present, PolyShield technology has proven to be recyclable when used in colored bottles, but the recycling performance of transparent bottles remains to be further tested. M&G's research team has successfully developed a new type of PET resin called ActiTUF, which contains not only the company's proprietary active oxygen absorber but also an inert gas barrier. M&G has developed three new types of PET resins, one with a reactive oxygen absorber only, one with an inert barrier only, and one with both. Each type of resin can adjust the resin's performance by changing the proportion of additives to meet the needs of different customers. Swift further added that ActiTUF series resin is mainly used for making single-layer barrier packaging bottles; the advantage of single-layer barrier packaging technology is that customers do not need to invest in other equipment, and it is more convenient and effective for manufacturers to determine the conversion of PET. rate. The European beer manufacturer Inbev first used PET beer bottles made of ActiTUF resin in 2003 and its products are now available in other countries. The company claims that the safety of ActiTUF resin's direct contact with food has been certified by European and US national security systems. Petcore has issued a certificate for the recycling of color-blocking bottles in 2005. It also issued a two-year interim certification for the recycling of transparent and light blue barrier bottles. PET bottle manufacturer Constar International Co., Ltd. has successfully developed the technology to add its Oxbar Reactive Oxygen Sorbent to multilayer barrier packaging bottles. The company is currently working on the development of Monoxbar monolayer barrier bottle technology. commercialize. Constar said: "We want to promote single-layer barrier packaging technology. The investment cost of multi-layer barrier packaging is too high." Constar is actively looking for a way to combine a single-layer transparent barrier bottle with DiamondClear's active oxygen adsorption process. New technology. The company claims: "In combination with the DiamondClear process, the company can manufacture barrier bottles with the same transparency and gloss as a pure PET bottle." "This technology is aimed at those who are currently using glass as a container and may be turning The application field of PET containers, especially small packaging containers with strict requirements for oxygen permeability."

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