Application and Promotion Measures of Green Packing Materials (I)

Green packaging materials are packaging materials that we produce, manufacture, use and recycle, which are harmless to human health, have good protection for the ecological environment, and are used for recycling. For example, polypropylene, corrugated paper, edible glutinous rice paper, corn paper, edible recycled plastic wrap, and our daily paper packaging products and paper hand bags, paper cups, paper lunch boxes and so on. In short, various kinds of biodegradable plastic product packaging and raw materials that can be dissolved or polymerized, etc. Degradable plastic product packaging uses photosensitizers to degrade polymerized, biologically or chemically degraded plastics and other packaging items. This is an important aspect of our choice of packaging materials.

The new type of green packaging materials (degradable materials) that are currently being researched and developed globally are all directed against the “white pollution” that is difficult to handle. Therefore, according to environmental protection requirements and the ownership of materials after use, green packaging materials can be roughly divided into three categories: First, recyclable materials. Including paper, cardboard materials, molded pulp materials, metal materials, glass materials, usually linear polymer materials (plastics, fibers), also includes degradable polymer materials. The second is natural weathering materials that return to nature. Including: 1. Paper product materials (paper, paperboard, molded pulp materials); 2. Degradable materials (photodegradation, biodegradation, oxygen degradation, photo/oxygen degradation, water degradation) and biosynthetic materials, grasses , wheat straw filling, shell filling, natural fiber filling materials, etc.: 3, edible materials. The third is the quasi-green packaging material - it can be recycled and incinerated without polluting the atmosphere and possibly regenerating the material. Including part of the line can not be recycled processing polymer, reticulated polymer materials, some composite materials (plastic-metal), (plastic-plastic), (plastic a paper) and so on.

1, green packaging printing paper

The four pillars of modern packaging—paper, plastics, metal, and glass—are the fastest growing paper products among these four types of packaging materials. Paper and plastic are the cheapest, raw materials are widely available, and are not as fragile as glass, nor are they as good as iron. Heavy, easy to carry. Therefore, paper and plastic packaging are widely used in daily life. According to international health organizations and domestic environmental protection experts, plastic waste may cause white pollution and is not conducive to environmental protection. Therefore, the use of plastic food bags should be gradually banned, and environmental protection paper bags must be used. In the future, we must use non-toxic and harmless “full paper eco-bags”.

Paper packaging materials are not only rich in resources, easy to recycle, but also easy to degrade. After paper products are processed, they can be used to recycle recycled paper or as fertilizer for plants, reduce air pollution, and purify the environment. Therefore, compared with the other three plastic, metal, and glass packagings, the LCA (Life Cycle Assessor) technology is used for quantitative evaluation, and paper packaging will become one of the most promising green packaging materials. Cartons, paper bags, paper drums, pulp molded products have become an important part of the modern packaging industry. Paper packaging containers are widely used in transportation packaging and food packaging because of their characteristics of light weight, easy processing, low cost, and easy recycling of wastes. At present, the output of paper and paperboard is increasing year by year. Packaging paper and cardboard occupy the national paper and paperboard. More than 50% of the total output, per capita consumption of paper has become an important symbol of international economic performance and civilization. In the proportion of materials used for packaging products in various countries of the world, the use of paper accounted for the first place.

Many papermaking companies in Japan have researched and produced green packaging and printing paper for the printing and packaging industry, and have been active in the green packaging product market. Japan's Nippon Paper Co., Ltd. has developed and produced fully deep-stamped papers that use natural fibers as raw materials under the name “Npimold Paper”. Its stretchability is 5-10 times that of plain paper. The stamping paper can press texturing, patterns and three-dimensional curved surfaces when molding, similar to the processing of plastic products, and smoothing the convex image can achieve better sealing. The product can be produced using the current plastic product equipment and molded according to the design scheme: since no heating and softening are required before processing, the production efficiency and energy saving can be improved. Challenge Five Co., Ltd. introduced biodegradable films and envelopes produced by Mit Subishi. The films and letters are also produced from polylactic acid extracted from corn starch and can be offset using soybean ink. Dynic Co., Ltd. develops biodegradable flexible sheet “Au Pair Corn Sheet” using cornstarch and fatty polyester as raw materials. The goal is to eventually replace PVC. This material is easy to machine and cut, easy to print, and its thickness can be adjusted according to the requirements. Landfill disposal does not pollute the environment. Because of the low calorific value during incineration, no toxic substances such as dioxins are produced, so it is less harmful to the environment:

The latest application market for new paper packaging is alcohol packaging. As in Japan, the use of carton packs to replace glass bottles as alcoholic beverages is now popular: Western countries also use paper materials to package wines and fill them into Tetra Pak's sterile brick cartons. The reason why the use of Tetra Bacterial bricks is mainly because the Tetra Pak has the advantages of safety, durability, non-breakable and explosion, and it is easy to carry and easy to open. In addition, one of its outstanding features is that it consists of 6 layers of composite material, which enhances the sealability. It also enhances the anti-alcohol leakage and volatilization of the package; at the same time, it can also block direct sunlight and prevent deterioration. Another insurmountable traditional paper packaging is oil packaging, because the oil molecules are extremely small and can easily seep through the paper packaging to the surface. Japan recently developed a boxed edible oil-based compound carton that uses paper as a substrate and is composed of six layers of aluminum-plastic composites. Its structure is: PE/paper/PE/AL/PET/PE. The package made of the composite material is not only lightweight, safe, but also suitable for printing, so the packager can print a beautiful pattern on the box to improve the value of the product.

A Japanese company has developed a wrapper that has a dehydrating function without heating or additives. Its packaging paper, called PS, enables food tissue cells to be destroyed. It absorbs water on the surface of food by absorbing water along the intercellular space, and it can absorb the deep water inside, and also has the function of absorbing water at low temperature. In this way, the wrapper can inhibit the activity of the enzyme, prevent the decomposition of the protein, reduce the proliferation of microorganisms, and achieve the effect of maintaining the freshness of the food, concentrating the umami component, removing the water vapor, and improving the toughness. When the packaged fish and meat are used for cooking, heat energy for heating can be reduced, deterioration of the heating oil can be prevented, and conditioning and processing can be facilitated without losing umami taste due to freezing. The mechanism of the packaging paper is that the semipermeable membrane that can only pass through water is selected as the surface material, and the inner side is placed with the osmotic pressure material and the polymer water absorbing agent. Since the moisture in the food is osmotic pressure difference in the liquid state, the semipermeable membrane can be moved to the high osmotic pressure substance, so that the moisture is fixed by the polymer water absorbing agent.

Paper Village Shake has always been considered environmentally friendly material. Because it can be made into recycled pulp. However, some paper packaging materials add other substances to increase the strength. Affected regenerability. In Europe and America, PLMEX food packaging paper is popular nowadays. It contains no phosphor and chemical substances that harm human body. PLMEX made of paper is only waterproof, oil-repellent, anti-stick and heat-resistant, and can be washed clean after use. Use it again. Use up to 50 times. BASF Chemicals Group has also developed a protective coating applied to the surface of packaging paper. This packaging paper coated with polymer dispersion is resistant to water, moisture, oil and grease. And without having to change the existing production process can be manufactured, does not affect the effect of recycling

(to be continued)