Application of the hottest waste paper recycling i

The application of waste paper recycling in the field of packaging

scientists call all kinds of discarded waste paper, waste wood fiber and wood waste "the fourth kind of forest". Among them, waste paper refers to the general term of used paper and paperboard, as well as the leftover materials of paper and paperboard used in relevant industries, or "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

green packaging materials

the green wave with environmental protection and sustainable development as the core, its purpose is 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 mankind's entry into a high level of civilization and the rapid development of the world economy. They came into being in the call of mankind 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 and reuse, but also has the unique performance of environmental degradation and return to nature

according to environmental protection requirements and the attribution of materials after use, they can be roughly divided into three categories: recyclable materials (including paper products, glass, metals, linear polymers, 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 products are a kind of renewable green packaging materials that originate from nature and can return to nature. The recycling of waste paper conforms to the development direction of "paper instead of wood" and "paper instead of plastic" in the packaging industry, and meets the requirements of green packaging

significance of waste paper recycling

paper products belonging to 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 kilograms of chemical raw materials and 600 degrees of electricity. Practice has proved that the strength of pulp remains basically constant after repeated utilization of waste paper

although the recycling of waste paper will increase some costs and difficulties due to the cleaning of sundries, inks, etc., it can reduce energy consumption, reduce the consumption of papermaking accessories that pollute the environment such as aluminum sulfate and caustic soda, and 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

application of waste paper recycling in the field of packaging

throughout the world, although the recycling of waste paper is mainly used to produce pulp raw materials for recycled paper, countries are trying to explore new ways of waste paper utilization (such as producing packaging and building materials, improving agricultural and animal husbandry production, producing methane, manufacturing pencil rods, etc.) in order to make more effective use of waste paper, 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 development 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 lives In terms of regularly opening the main cover, pulp molded products have also developed rapidly. The paper mold process is simpler than that of foamed plastic, with short production time and cycle, low energy consumption and raw material cost. Its antistatic, anti-corrosion and shockproof properties are better than those of foamed plastic products, and it can be recycled. After being discarded, it will decay and decompose by itself in the natural environment, which will not cause obstacles to the environment and recycling, and is favored by the majority of consumers

pulp molding refers to breaking waste paper or finished pulp into pulp, adding an appropriate amount of waterproof agent and rubber, using molding methods such as vacuum adsorption, and molding with molds corresponding to the shape of products, such as containers, trays, shields, industrial buffer packaging products, which can be used together with corrugated boxes for shock absorption during long-distance transportation. Packaging, padding and filling materials made of waste paper can replace foamed plastics

pulp molded products can improve their structure by 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 strips, which are also the top wood plastic composite new material. 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 wool, paper pulp, straw, straw, synthetic fiber, etc.), animal fiber substances (bristles, wool, felt, etc.), mineral fiber substances (glass fiber, asbestos, mineral fiber, etc.), bubble structure substances (natural rubber, synthetic rubber, foamed plastic, bubble plastic film, etc.), corrugated paper and corrugated paper Buffer device (spring, suspension device, etc.). The typical cushioning material made of waste paper is pulp molded products. In order to improve its cushioning, you may not know much about the difference between masks? Experts from various countries have done a lot of research on punching performance or simplified manufacturing process, and the main results are as follows:

a Japanese company uses waste paper to make a new type of cushioning packaging material with many shaped hemispherical air layers on the cross section. Its verticality and folding are very good, and the cushioning performance is no less than that of commonly used PSP materials, which can adapt to the packaging design of a variety of goods, and the strength can be adjusted by changing the thickness of the diaphragm

E-TECH company of the United States uses waste paper to make square 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 plastic, this material is more convenient, fast and non-toxic in filling

a company in Hamburg, Germany, chopped 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 will become foam, forming porous pellets to make foam packaging materials. 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 composites (the factors that cause instability should be excluded) and paper aluminum plastic composites (base paper, high-pressure low-density polyethylene, aluminum foil, etc.) are 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, And it is injected into the open hole injection molding machine to form new composite materials

this composite produced from waste paper has better thermal stability and fire resistance than general resins, better mechanical properties than some synthetic resin materials, better molding ability, small shrinkage, no moisture absorption in the air, and good appearance stability

4. New packaging containers

waste paper can generally be used to make low-grade toy boxes. The research results of the new paper packaging containers are mainly shown in:

Kao company of Japan immerses the waste paper in water, and then uses a beater to make pulp, and then injects the 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. uses kraft paper, box board paper, corrugated and other waste paper as raw materials, and in the production process, the yarn is embedded in a large area of pulp to form a packaging paper bag at one time. This product has good air permeability, high strength, non-toxic, non polluting 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 hide color, bleaching 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 Japan 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. Blow the particles into the open metal mold, and then close the metal mold for pressure heating. The moisture contained in the paste is discharged from the vent during the heating process, which can make packaging products with better biodegradability

in the "Tenth Five Year" development plan and the long-term plan for the next fifteen years of China's paper industry, the new policy of "gradually realizing the diversified raw material structure of giving priority to wood fibers, expanding the recycling of waste paper, and scientifically and reasonably allocating non wood fibers" is put forward. Waste paper, as a potential recyclable wood resource, 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