The hottest plastic packaging in the 21st century

2022-10-05
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Plastic packaging in the 21st century

in terms of total consumption, the consumption of packaging materials has been experiencing a continuous decline since it peaked in 1991. This trend reflects the continuous improvement of packaging efficiency, assuming that the products packaged at that time are still protected by packaging materials. People give preference to lighter systems, regardless of the fact that the processing system imposes lower taxes on heavier materials such as metal and glass than most flexible packaging materials. However, the cost of soft systems is generally better anyway

consumers also prefer light and cheap systems, and have never paid attention to the quota of reusable packaging when using them. When consumers have to pay a small tax for recycling programs, flexible packaging has accounted for two-thirds of the application share. Without the technological development that has already appeared, there will be no such trend

product protection of less materials

when solid materials such as glass or metal will be replaced by plastics, the first thing we encounter is an important technical defect. The physical structure of the polymer means that the barrier effect of the polymer is inhibited relative to the material exchange with the environment. For the most important substances - water vapor and oxygen, the performance of the basic polymer shows that it is extremely incompatible with the requirements of sensitive products. The correction method here is to use barrier materials with several derivatives to develop bonding materials (composites)

polymeric barrier material

typical forms of polymer development and processing are given the first preference. Multi layer materials, especially the materials produced by CO extrusion, have been optimized for a long time through the selection of appropriate polymer components. 1. The experimental device should have a nameplate (Yan marked with model, manufacturer name, factory number and date). They are widely used in the market, mainly in a large number of flexible packaging. 1. They are also used in multi-layer containers during experiments. For example, many companies are currently testing plastic beer bottles

the in-depth development includes the development of new barrier polymers and the production of suitable mixtures. Examples are the development of barrier polymer for PET beverage bottles, or the development of PA mixture for high temperature sterilization

further development can be made in processing technology. With more highly ordered molecular structures, biaxial stretching produces better barrier properties

however, due to the limited performance of basic polymers, the possibility of this technology is limited. But we will still be able to witness sustained and in-depth development

barrier film made by vacuum technology

a smart way to improve the barrier performance of polymeric materials is to cover the polymeric materials with inorganic thin layers. This can generally increase the barrier effect of the film by 100 times, and the thickness of the barrier layer used is less than 0.5% of the thickness of the base film. Because the aluminum treatment of PET film has been widely recognized, and the results on BOPP are also good, the transparent layer is beginning to follow the aluminum treatment

although it has taken an astonishing long time for deposited oxides to be recognized in the industry, this process is going through obvious and rapid market expansion

the in-depth development in the field of film production and coating technology, on the one hand, has wider functions (improved barrier performance), on the other hand, it is possible to provide significantly thinner composites. Examples include:

◆ optimization of coating process to provide better transparency and improve adhesion (especially for composites subject to high temperature sterilization)

◆ produce new laminating adhesives and replace the lamination process by applying sealable coatings

◆ develop organic/inorganic hybrid polymerization. At the same time, the rapid development of new energy vehicles has opened a broad market for plastics. Its combination with inorganic barrier layer can improve the barrier performance by several times

◆ multilayer film developed for subsequent vacuum packaging

mastering the whole production chain will form a decisive factor for the in-depth development of the multilayer film field. In terms of the types of polymers used for the outer layer, the base films will be optimized, and their surface quality will be optimized for coating. Pretreatment processes will be developed to further smooth the film surface and provide more fixed points for the bonding of the layers used. The coating process itself and further processing methods will be more gentle

the end of the production chain is the filling process, which currently represents the weakest link of packaging materials today. The operators of the bag filling plant will see that with the continuous refinement of flexible packaging materials, the effects of mechanical stress and sealing seam tightness will have functional limitations. In packaging materials with medium barrier properties such as vacuum coated BOPP, the filling test results show that the permeability of the finished product packaging is greatly improved

because it requires a large investment for most filling plants to remedy this, the trend here will also be to introduce significantly improved materials

barrier thin layer of plastic containers

at present, there are three different processes for coating PET bottles in the market. Two are used internally and one is used externally

a common problem of all processes is that from the overall effect, the barrier thin layer has little effect on the thicker substrate, so it is not very effective from the perspective of cost. Will 12 μ The barrier performance of m-thick bi-directional polyester film can only be improved by 400 times for the inorganic thin layer μ M thick PET bottle wall is increased by 6 times. Moreover, the lamination or painting of the additional barrier layer of the composite film often loses its effect in the covered container

the development of plastic containers with significantly improved barrier properties is still an important technical challenge, and the economic success is more difficult to predict than that of thin-film materials

a common problem of all processes is that from the overall effect, the barrier thin layer has little effect on the thicker substrate, so it is not very effective from the perspective of cost. Will 12 μ The barrier performance of m-thick bi-directional polyester film can only be improved by 400 times for the inorganic thin layer μ M thick PET bottle wall is increased by 6 times. Moreover, the lamination or painting of the additional barrier layer of the composite film often loses its effect in the covered container

the development of plastic containers with significantly improved barrier properties is still an important technical challenge, and the economic success is more difficult to predict than that of thin-film materials

a supplementary survey between manufacturers and retailers revealed a more dilemma: manufacturers refused new functions, such as opening agents or resealing capabilities, even if the additional cost was low, "because retail trade would not accept them". Retail trade rejects these functions because customers are not prepared to spend money on them. But when the deal difference asks consumers at the door of the supermarket or in front of the door, they claim that if they are provided with a good solution copy, they are willing to pay for the obvious extra price. It's impossible to say how fast it is to find a solution. People don't like adventure, and this is an important obstacle to our social innovation. Many customers' dissatisfaction with the supplementary packages will continue to increase as the average age of the population increases

convenience products

providing customers with real new products will achieve obvious success, because this is the decisive factor for obtaining a large number of convenience products

ready to eat meals can be simply heated in an oven or microwave oven. Pre cut meat and fresh salad are just a few examples of successful application of products. There is still a long way to go to reach market maturity. These products need packaging with a large number of technical features, and we are still far from mastering these technologies

conclusion

polymers play a decisive role in the development of all descriptions, both as basic materials and as components with special barrier functions

because the number of materials combined is increasing, we will find less single-molecule materials in the market. Treatment technology will also be adapted to this situation, so that effective recycling strategies will be available for composites

in terms of the total amount involved, basic polymers will continue to dominate. Through original refining technology, special polymers and additional coating steps are used to adapt the basic polymers to special functions

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