The influence of the hottest German adhesive on th

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Germany: the impact of adhesives on the recycling of beverage containers

packaging is a very important thing that people often come into contact with in daily life. If appropriate packaging is adopted in the transportation, packaging and commodity circulation of various products around people, these products can realize the logical management related to quantity and variety. This is particularly important for 149 beverage enterprises with crosslinked polyethylene (PE-X) piping system for cold and hot water using bottles, metal cans, cartons and other packaging containers. Adhesives are the materials that must be used when cartons are packed, packaging containers made of cardboard and plastic are sealed, and trademarks are pasted on glass and plastic bottle containers. This article will focus on the current situation of recycling or recycling of various packaging materials in Germany and the impact of adhesives on the quality of packaging containers during recycling or recycling

first, environmental problems

among the methods to control the consumption of natural resources, there are many methods, such as the use of resources, the repeated use of products, and the use of high-tech recycling or renewable use of resources. The above method is called closed circular economy utilization method. The key to avoid abandonment is the best choice with the highest priority. Waste can be recycled to a limited extent, and further become recyclable recycled materials for effective use. Therefore, in the future, with the in-depth development of sustainable development economy, it is entirely possible to find ways to save resources and recycled raw materials and energy. Although it is not a problem of recycling to reduce the use of adhesives, we should also start from the point that the main materials are not produced by the use of adhesives during recycling, which should be considered in commodity design

second, save resources

if problems occur in transportation and storage, it is best for the environment to reduce the use of packaging, and it is possible to use less packaging materials to pack the same amount of products in practice. From 1991 to 1999, the average annual consumption of packaging in Germany decreased from 95.6kg to 82.5kg. When implementing the closed circular economy use method, the recycling of packaging materials must be considered when designing products

III. recycling of glass containers

I'm afraid the glass containers after use have been recycled in the Medieval Roman period. In Germany, 2.3 million tons of glass containers were sold in 1974, and 150000 tons were recycled, with a recycling rate of 6.5%. By 2001, the recycling rate had reached 87%. Select the colors that consumers like to use through discrimination. Then through the highly precise quality management system in the processing plant, the recycling rate of green bottles has reached more than 90%, while the recycling rate of white and brown bottles has also reached more than 50%

after recycling, the glass bottle is melted at a high temperature of 1550 ℃. The glass liquid in the state of hot liquid dissolved at high temperature from the melting furnace flows into the forming machine, forms into glass containers (bottles), and then enters the smelting annealing furnace. This is an overview of the processing process of recycling. The adhesive used in labeling will not hinder the whole recycling process. Because these adhesives are organic substances such as casein and synthetic polymers, they can be completely burned when the recycled glass containers are melted at high temperature, without affecting the quality of the glass bottles

IV. recycling of metal cans (aluminum and tinplate)

canned beverages made of metal aluminum and tinplate materials have increased sharply in the past decade. Like glass bottles, Germany has also recycled this kind of metal cans for a long time. However, unlike other materials, the recycling of metal cans will not cause quality loss. Compared with the metal made for the first time, the energy consumption of metal cans can be reduced by 95% when recycled

in the process of recycling metal aluminum, the trademark label, plastic part and other non-metallic parts have been burned or evaporated at a temperature lower than the melting point of aluminum 660 ℃. Aluminum recycled metal materials like this can be used as new materials without loss of quality. However, compared with the manufacturing of aluminum materials refined from bauxite, it consumes less energy and water. Tinplate cans have a very thin tin coating and are made of 99.8% stainless steel. Good research progress has been made in developing and reducing the amount of packaging materials. For example, the weight of 330ml beverage cans has been reduced by 28g in 1976, and by about 20g in 2000. Due to the unique magnetism of stainless steel, a very simple method can be used to recycle the used empty cans and containers. And it can be easily recycled and concentrated from the waste pile. According to the recycling statistics of DSD in 2000, German households collected 3140 million tons of tinplate, equivalent to 80% of the recycling rate. In the process of high-temperature recycling of metals, adhesives made of organic polymers, such as those used for labeling, have been burned off at high temperatures, so they will not have any adverse impact on the quality of recycling and will not hinder recycling

v. recycling of plastics

the most obvious increase in beverage bottle materials is polyester (PET) plastic bottles. Its lightness, transparency and softness are the most ideal material properties for packaging beverage bottles. As a packaging material, PET bottles successfully shoulder the huge task of the closed chain recycling system from bottle to bottle in 2002. The recycled materials are divided into several processes, including sorting, crushing, cleaning, and removing pollutants. The food and Drug Administration (FDA) of the United States has approved the recycling of plastic PET materials for direct use in food and in direct contact with food

about 340000 tons of PET bottles recycled in Europe in 2001 were used in various recycled food processing processes. The recycling rate increased by 20% over the previous year. In the recycling of PET bottles, in addition to continuing to be used as new bottles, they are also used as fibers in the processing of thin materials and strings, as well as in the manufacture of clothes and blankets. It is predicted that the number of recycled PET bottles will double to 700000 by 2006

contrary to the recycling of glass bottles and metal cans, the labeling adhesive used on PET bottles must be considered in the recycling process, and a recycling process should be added. Therefore, it is necessary to use casein detergent and water to dissolve the adhesive. The commonly used method is the heating and melting method composed of water-soluble thermoplastic polymers. For the filling machine used in beverage production, it is suggested that when choosing the adhesive for labeling, we should consider the recycling of bottles in the future and choose the appropriate adhesive

VI. recycling of beverage cartons

beverage cartons for products with relatively short shelf life are made of cellulose and polyethylene (PE) layers. The products with relatively long shelf life are packed in cartons, and a metal aluminum foil layer between cellulose and PE layer is added. Although this layer is extremely thin, the carton with a thickness of 0.4mm is composed of 0.06mm PE film and 0.0065mm aluminum foil respectively. However, this can fully meet the requirements of packaging containers for beverages. The recycling of beverage carton packaging is similar to the recycling of paper, and does not need to consume a lot of energy. The proportion is not too high, 75% - 80%, the rest is pe21% and aluminum foil material 4% (the latter is a beverage with long shelf life). In Germany, 130000 tons of beverage cartons were recycled in 2001, and the recycling rate reached about 65%

no additives are used in carton packaging, so it is easy to dissolve the fiber with water and then crush it. It only takes a short time to fibrosis the cellulose of the carton into pulp, and then after screening and sorting. These materials can be used to make corrugated boxes, paper straws, fabrics and blankets. There are also several effective recycling processes for the remaining PE and aluminum foil. PE can be used as energy in cement, inorganic adhesives and cement manufacturing industry, and aluminum foil can also be used in cement manufacturing industry

VII. Recycling of carton packaging

cardboard packaging materials used in beverage bottle packaging are very important materials for beverage enterprises, so it is also very important to consider its recycling. In the 13th century, paper has begun to be recycled. But now, great changes have taken place not only in technology, but also in the motivation of recycling. In the early stage of recycling, it is used as the raw material of notebook. Later it was used as antique paper

in 2001, more than 11million tons of ancient paper were processed into new paper and paperboard. In this way, in quantity, ancient paper is also one of the most important raw materials for manufacturing paper, cardboard, corrugated boxes and so on. The purpose of recycling ancient paper is to recycle cellulose fiber raw materials and further produce new paper. Other ingredients contained in ancient paper will not cause problems in recycling, but it is best to remove them quickly and completely

VIII. Ingredients other than paper in paper containers

ingredients other than paper in paper packaging containers can be separated and removed by mechanical separation methods such as punch screen, slatscreen (which will produce higher production cost and longer production time n) and centrifugal separator. These very small components and disintegrated tiny particles cannot be removed by general methods. These mechanical methods are very ideal

in the production of clean products without any problems, clean cellulose fibers must be recycled. The ingredients that can cause problems are almost entirely in the high temperature conditions of the papermaking process, and some adhesive substances become thermoplastic and then mixed into the paper. Moreover, the resin and coating in wood, the binder, compound agent and filler of printing ink will become problems

nowadays, the recycling process of modern paper for recycling will be separated after selecting the large solid mixture and the particle mixture of thermoplastic plastic. In addition to using the latest technology, it is impossible to separate water-soluble, water dispersive and fine impurity particles clearly. Although adhesives only account for a small part of the whole package, they are a hot topic in the process of recycling paper. The task principle of recycled paper is that the servo system controls the electromechanical processing process, which is basically a mechanical processing process: after the cellulose fiber is broken under the action of physical external force, it is processed into new paper and paperboard according to the characteristics of the obtained fiber

IX. bonding system for sealed carton packaging

the use of adhesives for the sealing of packaging materials made of cardboard is a very important means and method. These adhesives will be mixed with the recycling of packaging waste paper, so they must have the characteristics that will not damage or damage the recycling of paperboard packaging materials. There are three common sealing systems for carton packaging sealing: hot melt sealing system (hotmelt), pressure sensitive adhesive tape and water rewetting adhesive tape

the above three sealing adhesive systems are generally used on the packaging automation operation line. The problem of "fatigue aging" of the adhesive sealing system during transportation and storage must be considered when selecting the sealing system

source: China Food News

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