People in the plastic packaging industry also believe that with the steady growth in the output of packaging materials and packaging products, the current development of plastic packaging products in the world presents four major trends: the new type of polyester packaging is playing a leading role; new types of degradable plastics have attracted attention; vigorous development of metallocene plastics Foam plastic to zero pollution. However, no matter how the new materials, new processes, new technologies, and new products are changed, we can find a point from these four major trends. That is the trend of the development of plastic green flexible packaging. This will also have a huge impact on the development of pharmaceutical packaging.
The adjustment of the world economy continues to deepen, and the transformation of the sustainable development strategy provides a great background for the environmental change of the plastic flexible packaging industry. The environmental protection involved in the sustainable development strategy has prompted consumers to put forward higher requirements for the packaging of goods. Green packaging is a requirement for the development of international environmental protection. It also represents the development trend of packaging industry in various countries, and is one of the important contents of improving product market competitiveness and avoiding new trade barriers. Corresponding to this, the greening of plastic flexible packaging has also become an important development trend.
In recent years, China's plastic flexible packaging industry has been rapidly developed, but also strongly promoted the progress of the pharmaceutical, chemical and food industries. The progress of these industries in turn further stimulated the market demand for plastic flexible packaging. With the continuous improvement of materials and processing technology, gravure plastic flexible packaging is playing an increasingly important role in many areas. In addition to living needs, pharmaceutical packaging, industrial product packaging, etc. also use plastic flexible packaging.
The connotation of green packaging
There is not a completely unified definition of green packaging. In general, moderate packaging that can be reused, reused, or degraded, and that does not pose a hazard to the human body or the environment throughout the product's lifecycle is called green packaging. The most important meaning of green packaging is to protect the environment, but it also has the significance of resource regeneration. As a result, developed countries in the world have determined that packaging must comply with the â€œ4R+1Dâ€ principle, which means to minimize packaging resources, develop new green materials that are harmless to the human body and the environment, and be biodegradable and recyclable.
Therefore, this profound change in the plastics flexible packaging industry is from packaging processing equipment to technology, and then to material selection. All three aspects need to change from traditional to green.
New Advances in the Green Green Packaging Film in the Process of Green Composite Processing in Plastic Flexible Packaging Process
Reusable and recyclable
Repeated use of packaging such as the implementation of beer, beverages, soy sauce, vinegar and other packaging using glass bottles, repeated use. In Sweden and other countries, PET PET beverage bottles and PC milk bottles have been reused for more than 20 times. Wellman Holland and Holmson of the United States have recycled 100% PET containers. For example, polyester bottles can be regenerated in two ways after they are recycled. The physical method refers to the direct and thorough purification and comminution without any residual contaminants. The treated plastics are then used directly in the recycling of packaging containers; the chemical method refers to the recycled PET. After crushing and washing, depolymerizing agent such as methanol, ethylene glycol or diethylene glycol is used to depolymerize PET into monomers or partially depolymerize into oligomers under the action of a basic catalyst, and then condense and then polymerize monomers or oligomers. Recycled PET resin packaging material.
For decades, the familiar glutinous rice paper used for candy packaging and corn baking packaging cups for packaging ice cream are typical edible packaging. Among the more mature synthetic packaging films is the pullulan resin that has been industrialized since the 1970s. It is an odorless, odorless, amorphous, amorphous white powder that is non-ionic, non-reducing, and stable. Polysaccharides. Since it is a polyglucose composed of a-glucoside, it is easily dissolved in water and can be used as a viscous, neutral, nonionic, non-gelatinized aqueous solution.
Its 5%-10% aqueous solution can be made into a film with a thickness of 0.01mm by drying or hot pressing. It is transparent, colorless, odorless, nontoxic, has toughness, high oil resistance, can be eaten, and can be used as food packaging. . Its gloss, strength, and folding resistance are all better than films made from high-chain starch.
Recently, researchers in Wuhan developed a new edible packaging film for inner packaging materials. The product is made from raw materials such as dried husks, potatoes, broken rice, etc. through fermentation to convert into polysaccharides, which are then stretched into films. The membrane is a macromolecule made of glucose, which has the characteristics of edible, degradable, colorless and transparent, and good oxygen barrier. As a food packaging film, its right-angle tear strength, mechanical strength, light transmission, etc. can reach the film standard of plastic packaging. After the film is made into a bag, the powdered milk and salad oil do not leak oil and can be consumed together with milk powder in water.
Degradable material refers to a plastic whose chemical structure changes under a specific environment at a specific time. Degradable plastic packaging materials not only have the functions and characteristics of traditional plastics, but also can be decomposed and reduced in the natural environment through the action of ultraviolet light in the sunlight or microorganisms in the soil and water after the service life is completed. Re-enter the ecological environment. The degradable plastics are mainly divided into synthetic photodegradable plastics, photodegradable plastics and biodegradable plastics added with photosensitizers, and multi-functional degradable plastics that are combined with various degradable plastics. According to the environmental conditions of degradable plastics, it can be divided into photodegradable plastics, biodegradable plastics (fully biodegradable plastics, partially biodegradable plastics), chemically degradable plastics (oxygen degradable plastics, water degradable plastics), and composites composed of the above three degradable plastics. Degradation material. At present, domestic research and development of varieties have included photodegradation, photobiodegradation, photo-oxygen biodegradation, high-starch content biodegradation, high-starch content biodegradation, high calcium carbonate filled photo-oxygen degradation, and biodegradation.
Polylactic acid (PLA) is a new type of polyester material produced from organic acid lactic acid. Its performance is better than that of existing plastics such as polyethylene, polypropylene, and polystyrene. It is defined by the industry as the most promising new type of packaging in the new century. Materials, a star of environmental protection packaging materials, will be expected to replace polyethylene, polypropylene, polystyrene and other materials for plastic products in the future, with broad application prospects.
Use paper materials
At present, many companies have considered the use of medium-sized, heavy corrugated boxes or white boxes to pack, and use a variety of moisture-proof fresh paper instead of plastic film for packaging. In the United States, more than half of plastic packaging has been replaced with new paper packaging. China's Shanghai Jiabao Packaging Company has introduced advanced equipment to develop a paper pulp model. This product is made from natural plant fibers such as reed pulp, bagasse pulp, wood pulp and other raw materials, which are scientifically formulated and molded. This pulp model is the ideal product to replace foam tableware.
(to be continued)
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