Exploring green packaging materials, printing and manufacturing processes

With the economic development and continuous improvement of living standards, there will be more and more packaging waste that cannot be recycled. Especially in the 1970s, after a large number of people used plastic packaging, more and more plastic packaging products and contaminants that could not be recycled became more and more serious. The resulting environmental pollution became more and more serious. This is one of the reasons why we discuss green packaging materials, printing, and process manufacturing.

What is green packaging material? Broadly speaking, it is the packaging material that we produce, manufacture, use and recycle, which is harmless to human health, has good protection for the ecological environment, and is used for recycling. For example, polyester, ethanol or diethylene glycol, polypropylene, corrugated paper, edible glutinous rice paper, corn paper, edible recycled plastic wrap, and our daily paper packaging and paper hand bag, paper cup, paper Lunch boxes. 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 selection of packaging materials.

As for the printing of packaging, it is another important issue for green packaging. In particular, ink is one of the important raw materials and important means for our printing. Ink is composed of pigments, binders, solvents, and auxiliary materials. Among them, pigments and solvents are inorganic and organic compounds, and the heavy metals are the most harmful to the human body. Metals such as lead, chromium, barium, and mercury, which are insoluble in water and media, are the most toxic and cannot be used in food packaging, children's appliances, and packaging for flat, concave, convex, and silk screen printing. Biphenyl gum in organic substances can lead to cancerous substances. The acetone, toluene, methanol and some aromatic solvents in solvents, toxic gases, and corrosive solvents cannot be used, that is, pigments, binders, and additives in inks. Solvents are an important raw material for making various kinds of inks. We cannot use heavy metals as pigments, water-based binders, and Western Europe, Japan, and Taiwan have promoted water-based UV binders and inks as pigments. Water soluble liquid photosensitive resins have been studied in Guangdong as early as the 1960s in China, and it can be used to make waterborne UV varnish and waterborne UV inks. Its manufacturing cost and process are very simple, and the photo-curing (drying) is performed by the light of less than 380 degrees. The light source is UV light that can be mounted on the press, but it must be covered to prevent burns. At that time, we studied the liquid resin plate black light (ie, 3-5 pieces of agricultural germicidal lamps) as a light source, it can reduce the harm of ultraviolet light on the human body, its cost is very cheap, and the process is extremely simple. Today's plastic packaging such as plastic bags and plastic lunch boxes are insoluble. It is a toxic polyvinyl chloride resin blow-pressed, its characteristics are simple process, low cost, easy to carry. However, its biggest drawback is its environmental pollution and its non-renewability. If we use scientific attitude and advanced technology, we can also achieve the goal of simple technology, low cost, and convenient carrying. For example, plastic cups, plastic dishes, plastic lunch boxes, plastic bags for packaging items, etc. are heated and dissolved plastic particles and blowing agent, plasticizer blowing pressure, the process is relatively simple, low cost, but it is not conducive to environmental protection, Failure to reproduce these shortcomings will cause a great deal of environmental pollution. If we use paper or reconstituted recycled pulp and spray a layer of edible flow paraffin, foods that have been preserved in experimental paraffin and sealed with paraffin can be kept fresh for more than 2 years (use of spray seal rather than wax), Finally, it is made of recycled pulp, and its process and price are relatively simple and cheap (the paper cups and paper lunch boxes are now made from white plates and then compressed, of course, the price is much more expensive). When we change the process to make paper pulp from paper, it will not only reduce the price of packaged goods, but it can also be used for continuous flipping. (Equivalent to the process of flipping the toilet paper), if a layer of edible liquid paraffin is sprayed on the underside of the injection molding (note that spraying is not over wax, the effect of fresh-keeping is not the same as spraying and waxing). This is an inexpensive product. The path can be sought. In terms of quality, many papers are made from wood pulp and rags. Their fibers are longer and the quality is guaranteed. Another example is that we use fresh-keeping paper to blow fresh-keeping paper (O.03-0.05mm) in place of the existing multi-layer metal or multi-layer tin foil beverage box (Tetra drink packaging box), and then spray one layer Consumption of liquid paraffin instead of the current multi-layered beverage cartridges can increase the stiffness of fresh multi-layer drinks. In short, we can further explore the green packaging materials and printing methods through scientific methods, and do our best to protect nature!

From "Guangdong Printing"