Recycling application of the hottest waste paper i

2022-08-01
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Recycling application of waste paper in the packaging field

throughout the world, although the recycling of waste paper is mainly used to produce pulp raw materials for recycled paper, in order to make more effective use of waste paper, countries are trying to explore new ways to use waste paper (such as producing packaging and building materials, improving agricultural and animal husbandry production, producing methane, manufacturing pencil rods, etc.), and have made great progress. The application of waste paper recycling in the packaging field is mainly reflected in the following aspects:

1. Pulp molding products

the pulp molding industry has a history of nearly 100 years in some more developed countries. With the traditional workshop production of papermaking becoming a world-wide large-scale industrial production, all kinds of paper and paper products go deep into all aspects of people's life, pulp molding products have also developed rapidly. The paper mold process is simpler than that of foamed plastics, with shorter production time and cycle, lower energy consumption and raw material cost, better anti-static, anti-corrosion and shockproof properties than foamed plastic products, and can be recycled. After being discarded, it will decay and decompose in the natural environment similar to plants, which will not cause obstacles to the environment and recycling, becoming a way to save oil resources, reduce production costs The beneficial means to increase economic benefits have been favored by the majority of consumers

pulp molding is to break waste paper or finished pulp into pulp, add an appropriate amount of waterproof agent and rubber, use vacuum adsorption and other molding methods, and use molds corresponding to the shape of the products, such as containers, trays, shields, industrial buffer packaging products, which can be used together with corrugated boxes to facilitate shockproof and cushioning during long-distance transportation. Packaging, padding and filling materials made of waste paper can replace foamed plastics

the structure of pulp molded products can be improved according to the design, and the materials or surfaces with various components can be specially treated during production to achieve the performance and characteristics required for certain articles or under certain conditions. In addition, the paper mold obtained by different processing methods has different characteristics, so changing the processing method or process can improve the performance of the paper mold. At present, the use of pulp molded products is mainly based on its cushioning characteristics and strength characteristics

2. New cushioning materials

the commonly used cushioning materials for packaging mainly include: fiber substances (wood fiber, paper, pulp, straw, wheat straw, synthetic fiber, etc.), animal fiber substances (bristle, wool, felt, etc.), mineral fiber substances (glass fiber, asbestos, mineral fiber, etc.), bubble structure substances (natural rubber, synthetic rubber, foam plastic, bubble plastic film, etc.) Tile extraction of graphene from the laboratory has proved to be challenging for corrugated and corrugated paper, buffer devices (springs, suspension devices, etc.). The typical cushioning material made of waste paper is pulp molded products. In order to improve its cushioning performance or simplify the manufacturing process, experts from various countries have done a lot of research. The main results are as follows:

a Japanese company uses waste paper to make a new type of cushioning packaging material with many molded hemispherical air layers, which has good upright and folding properties, and its cushioning performance is no less than that of commonly used PSP materials, It can adapt to the packaging design of a variety of commodities, and can also adjust the strength by changing the thickness of the diaphragm

E-TECH company of the United States uses waste paper to make square shaped cushioning packaging materials, which are filled around vulnerable goods such as eggs, so that items cannot be moved in the box to avoid damage. Compared with foamed plastics, this material is more convenient, fast and non-toxic in filling

a company in Hamburg, Germany, shredded the waste paper and mixed it with starch, made the slurry into particles, put it into a sealed container, applied high-pressure and high-temperature steam, and then rapidly reduced the pressure, and the particle packaging became foam, forming a porous ball into a foam packaging material. The cost of this product is lower than that of polystyrene, its impact resistance is better than that of polystyrene, and it can be quickly decomposed by microorganisms and fungi after being discarded, without polluting the environment

3. New composite material

composite material refers to the combination of several materials to become a new material with better functions. Common paper plastic composite materials (base paper and plastic film) and paper aluminum plastic composite materials (base paper, high-pressure low-density polyethylene, aluminum foil, etc.) are all composite materials made from base paper. American experts grind waste newspapers into powder with a turbine grinder, and then granulate waste paper, polypropylene, high-density polyethylene resin, ethylene propylene rubber and other mixed materials, It is injected into the open hole injection molding machine to form new composite materials

the composite material produced from waste paper has better thermal stability and fire resistance than ordinary resins, and better mechanical properties than some synthetic resin materials. It has good forming ability, small shrinkage, and does not absorb moisture in the air. It has a stable appearance. The coated and oiled aluminum foil developed by Huyuan aluminum is a good initiative in China

4. New packaging containers

generally, waste paper can not be used as an experimental machine to make low-grade toy boxes. The research results of the new paper packaging containers are as follows:

Japan Kao company immerses the waste paper in water, then uses a beater to make pulp, and then injects the paper pulp into a metal mold to form, and after drying, makes a packaging bottle that can contain powdery solids. If it is used to contain liquid shampoo, it is necessary to apply a thin stone coating on the surface of the packaging bottle for waterproof treatment

Shandong Hualin Paper Co., Ltd. takes kraft paper, box board paper, corrugated paper and other waste paper as raw materials, and in the production process, the yarn is embedded in the pulp in a large area to form a packaging paper bag at one time. This product has good air permeability, high strength, non-toxic, pollution-free and recyclable. It is mainly used for packaging powder and granular materials and making shopping bags and small postal bags

long view fiber company of the United States uses recycled kraft paper to produce a high-quality retail packaging paper bag with handle. Paper bags with original cow skin color, bleach and other colors can be printed in three to four colors, with long service life and biodegradation

a German company cuts the recycled old books and newspapers into strips, then grinds them into fibrous pulp, mixes them with flour in the ratio of 2:1, and then injects them into an extruder to press them into cylindrical particles. In the extrusion process, the raw materials are foamed by water vapor to form foam paper. Then use foamed granular paper as raw material to produce packaging products of different shapes according to needs. Foam paper can not only be used as packaging materials, but also be developed into insulating materials and building materials

the Japanese Institute of industrial technology crushed the waste paper to less than 5mm and mixed it with starch paste to make particles with a diameter of mm. The particles are blown into the open metal mold, and then the metal mold is closed for pressure heating. The moisture contained in the paste is discharged from the vent during the heating process, which can produce packaging products with better biodegradability

in the Tenth Five Year Plan for the development of China's paper industry and the long-term plan for the next fifteen years, the new policy of gradually realizing the diversified raw material structure of focusing on wood fiber, expanding the recycling of waste paper, and scientifically and reasonably allocating non wood fiber is put forward. As a potential recyclable wood resource, waste paper is increasingly valued by scientists and entrepreneurs. As long as it is reasonably recycled, It will play an unexpected role in the field of packaging

the significance of waste paper recycling in the field of green packaging

scientists call the discarded waste paper, waste wood fiber and wood waste the fourth kind of forest. Among them, waste paper refers to the used paper and paperboard, as well as the leftover materials of paper and paperboard used by relevant industries, or the secondary fiber. The recycling of waste paper conforms to the development trend of green packaging in the world, has a direct relationship with environmental governance and resource protection, and has good economic and social benefits. The green wave, with environmental protection and sustainable development as its core, aims to protect the environment and resources, make full use of renewable resources, and create a sustainable development environment for mankind. Green packaging materials are the inevitable product of human being's entry into high civilization and the rapid development of the world economy. They came into being in the call of human beings to maintain the living environment. They not only have the basic properties of general packaging materials (such as protection, processing operability, appearance decoration, economy, easy recycling, etc.), but also are harmless to human health and the ecological environment It is not only easy to recycle, but also has the unique performance of environmental degradation and return to nature

according to environmental protection requirements and the classification of materials after use, they can be roughly divided into three categories: recyclable materials (including paper products, glass, metal, linear polymers and degradable materials) Materials that can be naturally weathered and returned to nature (including paper products, degradable and edible materials) and materials that can be burned to recover energy and do not pollute the atmosphere (including some non recyclable linear polymers, bulk polymers and some composite materials)

paper product is a kind of renewable green packaging material that originates from nature and can return to nature. The recycling of waste paper conforms to the development direction of the packaging industry of replacing wood with paper and plastic with paper, and meets the requirements of green packaging

paper products, which are green packaging materials, occupy an important position in the whole packaging industry. They are widely used and have many varieties. From traditional packaging to modern packaging, they have always been one of the pillar materials of packaging, accounting for about 45% of the total output value of the whole packaging industry. For every ton of waste paper recycled by the paper mill, 800 kg of paper can be recycled, which is equivalent to saving 3 cubic meters of wood, 1.2 tons of coal, 100 cubic meters of water, 300 kg of chemical raw materials and 600 degrees of electricity. Practice has proved that the strength of the pulp remains constant after repeated utilization of waste paper

although the recycling of waste paper will increase some costs and difficulties due to the removal of sundries, inks, etc., it can reduce energy consumption, reduce the consumption of papermaking auxiliary materials that pollute the environment, such as aluminum sulfate, caustic soda, etc. at the same time, it can save packaging raw materials and energy, reduce the consumption of natural fiber raw materials, replace straw pulp, improve the quality of paper products, reduce production costs, reduce packaging pollution, protect the environment Multiple effects of maintaining ecological balance

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