Development of green logistics packaging materials

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Development of green logistics packaging materials

1 Introduction

after a long struggle, mankind has established brilliant achievements in transforming nature and developing economy. However, in the highly democratic world economic civilization, there are also uncivilized negative effects. Due to improper disposal in the process of industrialization, especially the unreasonable development and utilization of resources, and the lack of attention to the treatment of waste gas, wastewater and waste generated in the process of industrialization, the earth's resources are becoming increasingly scarce, energy is becoming increasingly scarce, and the environment is deteriorating, seriously endangering the earth's ecological space. 7. Overall dimension: 515 × two hundred and twenty-four × 603mm and the sustainable development of the world economy

environmental pollution, resource depletion and population surge have become three major problems that must be solved in contemporary society. A Green Revolution centered on protecting the environment and saving resources of organic chemical raw materials and new chemical materials is rising all over the world. The logistics industry is no exception. The wave of green packaging, especially after entering the 21st century, has come to people

2 green logistics packaging materials and the significance of development

the difference between green logistics packaging materials and general packaging materials is that they have good environmental performance and do no harm to human body and environment. It usually refers to materials that are easy to degrade, easy to recycle and can effectively recycle resources. Green packaging materials are the key to the development of green packaging. The research and development of pollution-free green packaging materials is the focus of attention all over the world. For logistics packaging, an important problem is to develop green transportation packaging materials with high strength, large board, good environmental performance, pollution-free, easy recycling and reuse and lightweight. It has become the technical key to the smooth development of green transportation packaging, We must attach great importance to it

traditional logistics transportation packaging materials are mainly wood, paper, reinforced plastics, metal steel and high-strength composites, but these materials have various disadvantages and deficiencies under the green concept. The author believes that bamboo is a kind of green material and should be in line with China's national conditions for many years

3 advantages of bamboo as a green logistics packaging material

3.1 excellent mechanical properties

bamboo is an excellent material growing in nature like wood. Bamboo mainly refers to the bamboo pole of bamboo, which is the most important part of bamboo utilization value. Bamboo has excellent mechanical properties:

the average tensile strength of bamboo is 208.2mpa, which is twice that of wood (the average value is 107.3mpa). Compared with steel, although the tensile strength of steel (average 560mpa) is 2. 5 times that of bamboo 0 times, but the density of steel is about 10 times that of bamboo. Therefore, according to the calculation of specific strength, bamboo is times higher than steel. The compressive strength of bamboo (average 48.7mpa) is about 10% higher than that of wood (average 44.4mpa). In addition, bamboo also has good elasticity and flexibility. The density of bamboo is below 1.0g/cm3, generally 0 Between 8g/cm3. The average mechanical properties of bamboo are better than those of wood. This fully shows that bamboo is an excellent natural plant material, that is, it is a complete green material

3.2 good resource advantages

bamboo is one of the important forest resources. China is a big country and kingdom of bamboo. It ranks first in the world in terms of species, area, volume, output, utilization history, employees and scientific and technological level. In particular, according to the national statistics, the area is about 5 million hectares, accounting for 1/3 of the world, and the amount of deforestation is more than 10 million tons, accounting for 1/2 of the world. Among bamboos, moso bamboo is the best and most mainly used for processing and utilization. Its area and output account for about 90% of the world. In any country in the world, the area or yield of a species is known as the number one in the world. However, with such an area and output of Moso Bamboo in China, no other species have been seen so far. China is a real big country with absolute advantages in bamboo resources. Therefore, in addition to bamboo, China also said that the experimenters need to maintain a high degree of concentration in the kingdom of bamboo

the biological characteristic of bamboo is that it can be used continuously with a little maintenance and management. It is the only inexhaustible and inexhaustible resource in China. Bamboo can be cut down every Mu every year, About 700kg (each piece of bamboo weighs about kg, and every 60 pieces can be equivalent to 1m3 of wood. The life span of bamboo is about years. The bamboo forest must cut down the old bamboo of more than years before the new bamboo can shoot. The average number of plants per mu of Moso bamboo forest is, and the high-yield forest can reach more than 440 trees/mu, and the number of old bamboo cut down every year is about.

3.3 advantages of processing and production

the processing and utilization of bamboo in China has a long history, which can be traced back to years ago.

first of all 。 Because of the growth characteristics of bamboo, it is decided to cut down old bamboo in the forest and let new bamboo germinate and grow

therefore, its felling must rely on artificial thinning in the bamboo forest one by one. Moreover, in the transportation after felling, the bamboo must be manually transported down the mountain one by one. It is a labor-intensive process that cannot be felled or mechanized. Secondly, the processing of bamboo is mainly broken bamboo strips weaving, followed by subsequent production or utilization. This broken bamboo strips and weaving process can adopt some advanced technologies such as machinery, but the basic processes such as weaving still need manual labor. These production characteristics are just in line with the advantages of China's surplus labor force

in addition, bamboo strip weaving requires long-term and experienced operators, so that practice makes perfect and has high efficiency. It happens that there are a large number of bamboo farmers in bamboo producing areas in southern China, and almost every family has such skilled craftsmen. Bamboo is produced in mountainous areas, which are the main support objects of China's "three rural" policy. Only by enabling these people to become rich through labor can the "three rural" policy be implemented

it can be seen that bamboo processing is the absolute advantage of farmers' production in mountainous areas of southern China, which can not be compared with any region or country$ Page break $

4 green modern packaging material - technical scheme for bamboo development 4.1 product design

4.1.1 bamboo ring honeycomb board replaces wooden pallet

the first step is to cluster and bundle the bamboo head and tail residues sawn off in bamboo processing, especially the bamboo tail (generally about 1m long and 3 ~ 6cm in diameter), and saw and cut them into bamboo rings with a certain thickness (about 3cm thick) (vividly introduced, very similar to cutting carrot slices). After the bamboo ring is sterilized, disinfected and dried at high temperature, EO grade urea formaldehyde resin glue (also phenolic resin glue) meeting the international environmental protection requirements is used to mix and glue the bamboo ring. In the second step, the prefabricated upper and lower bamboo mat plywood (made of bamboo mat drying and glue pressing) is glued on one side (EO grade urea formaldehyde resin) and glued bamboo ring, All bamboo rings are vertically distributed on the glue surface of the lower veneer (formed into honeycomb shape) by means of vibrating cloth plate, and then pressed to become the main plate of bamboo ring honeycomb tray. The edge sealing and foot of the tray can be pressed at one time (or pressed and combined separately)

at present, relevant research departments have developed a bamboo honeycomb panel instead of wood tray. Compared with bamboo ring honeycomb panel instead of wood tray, it seems that bamboo ring honeycomb panel is much stronger in strength, service life, water resistance and production cost. Advantages: ① high strength: after preliminary calculation, it is 5 ~ 6 times the strength of wooden tray; ② Long service life: it is estimated that the service life is 2 ~ 3 times longer than that of wood pallet; ③ Light weight and no deformation: the specific density of the tray is estimated to be about 0.6g/cm3. ④ It has good water resistance. The urea formaldehyde adhesive board is immersed in cold water (25 ℃) for more than one month without glue dispersion. If the phenolic resin adhesive board is immersed in water, it will not disperse glue for several months; ⑤ Low cost: estimated production of 1000 × For 1200mm pallets, the production cost is about 60 yuan/piece; ⑥ Green products; ⑦ It is an innovative product with a wide range of uses: in addition to being used for pallets, this kind of bamboo ring honeycomb board can also be used in other fields such as floor tiles and container bottom plates, which is the first at home and abroad

4.1.2 bamboo mat corrugated packing box board

this new material is basically designed with reference to the current production mode of various bamboo plywood factories in China. Its fundamental basis is a large number of bamboo plywood factories, especially small bamboo plywood factories in rural bamboo producing mountainous areas. Because the products are aging and can not be upgraded, their economic benefits are getting worse and worse. Many factories have been closed and idle, and there is an urgent need to change and upgrade. Therefore, without increasing the input of production equipment and making major changes in the process flow, try to design and produce Xinzhu mat corrugated packaging board on the original basis:

the first step is to weave bamboo strips of certain specifications by farmers in the production area according to the original production mode, which will be purchased by the factory. After high-temperature cooking and sterilization treatment, it will be impregnated with phenolic resin glue, drained and dried on a continuous dryer to control the final moisture content of bamboo mat to reach 10 ~ 12%, The corrugated bamboo mat is prefabricated on the prefabrication machine. In the second step, the prefabricated corrugated mat is stacked and assembled in 2 ~ 3 layers and placed into the hot press. It is hot pressed and solidified into corrugated core plate. The hot pressing temperature is controlled at 130 ℃ ~ 135 ℃, and the pressing time is 5 ~ 6 minutes. It is sent to the shaping machine to cool down and shape slowly. The third step is to take two single-layer or double-layer bamboo mat veneers produced in the same way as above as the upper and lower layers of corrugated board, glue the surface layer, and glue the peak of corrugated board, and then send the three-layer combination into the hot press for pressing and thermosetting. In this process, as long as the press is slightly pressurized, the time is about 2 minutes to meet the combined process requirements

if the bamboo mat corrugated board is required to be beautiful and durable, when the three layers are combined into a board, the prepared bamboo mat lath can be embedded in the periphery and hot pressed at one time to produce the edge bound bamboo mat corrugated packaging board

it is obvious that the production raw materials of the two new products in the above design are composed of two kinds:

a kind of bamboo and a kind of adhesive. It is only required that the use of adhesive meets the requirements of environmental protection and the amount of adhesive is reasonable. Then the content of free aldehyde and phenol remaining in the product meets the standards and meets the environmental protection requirements of product export

the production of bamboo mat corrugated board can be large or small, large factories with a high degree of mechanization, and small factories in rural areas. However, the key to production lies in the forming of corrugations. Under the technological process of this plywood production equipment, because bamboo has neither the calenderability of metal materials nor the plasticity of pulp and plastic, it is still quite difficult to realize the corrugated board required by technological production. Therefore, At present, there are corrugated boards made of various materials in the world: metal, pulp, cement, plastic, ceramics and so on. Only bamboo and wood corrugated boards have not been seen in the world. In fact, many countries have been exploring experiments, but it seems that only Chinese technicians can solve the problem

for the products without edge sealing of bamboo mat corrugated board, according to the preliminary estimation (thickness 25 ~ 30mm), the production cost per square meter is about 18 yuan

advantages: ① high strength, estimated to be 10 ~ 20 times higher than that of paper corrugated board. If two-layer bamboo mat veneer and three-layer bamboo mat corrugated core board are adopted, the strength can be 2 ~ 3 times that of wood board. ② High tech products; ③ Long service life, no deformation, and the service life is estimated to be more than 2 times longer than that of wood board; ④ It has good water resistance, and its water immersion resistance is the same as that of the bamboo ring honeycomb board; ⑤ Green products; ⑥ The cost is reasonable and the relative use value is relatively low compared with wood and composite plastic board; ⑦ Light weight, if wave distance is 70mm and wave crest height is 25mm北京治过敏性鼻炎时有什么要注意

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