Development and application prospect analysis of t

2022-08-02
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Analysis on R & D and application prospects of environment-friendly cushion liners

during the circulation and transportation of goods, it is inevitable that they will be damaged by various external factors such as machinery, environment, climate, biology, etc., and the country will suffer economic losses of 10 billion yuan each year due to unreasonable packaging. In order to reduce this loss, for electronic products, instruments and meters, household appliances, ceramic and glass products, buffer packaging is used to control the peak acceleration transmitted to the internal products, avoid product damage caused by excessive internal stress due to excessive inertia force, and improve the cushioning and anti vibration ability of commodity packaging in the circulation process

eps and EPE foams are the main buffer materials currently used in China. Although they have good protective capacity and performance price ratio, they have become one of the main sources of environmental pollution because they are difficult to recycle, can not be naturally weathered or rotten, and will produce harmful gases due to incineration. With the enhancement of people's awareness of environmental protection, the United States, the European Union and other countries have put forward restrictions on the use of foamed plastics and replaced them with packaging materials with good environmental compatibility, such as plant fiber cushioning materials, corrugated cardboard, honeycomb cardboard, pulp molding, etc. Therefore, the development of environment-friendly packaging materials and the study of cushioning pad structure have become the hot spots and focus of packaging peers at home and abroad

the following will compare and analyze the research and development methods, preparation processes, buffer characteristics and application prospects of environmental friendly buffer materials such as plant fiber, degradable foam, starch and expanded perlite

1 corrugated cardboard cushion liner

corrugated cardboard cushion has good processing performance, low cost and recyclability. It has been widely used since the 1950s. After the 1960s, EPS and other foamed plastics replaced corrugated cardboard cushion liner. With the gradual enhancement of people's awareness of environmental protection and the pressure from the servo control software environment of the ring tensile testing machine, the corrugated board and other cushioning cushions began to return to the stage. People are also in-depth studying the structural form and cushioning performance of the corrugated board cushion

on the basis of discussing the structural forms of common corrugated board liners, the paper compares and analyzes the test results and cushioning properties of several typical liners, obtains the relationship between the cushioning effect of corrugated board liners and their structural forms and sizes, and explains the selection methods of corrugated board liners. Literature. Using the structured neural network method, identify the nonlinear characteristics of the paperboard cushion, compare the identification results with the corresponding measured values, and take the maximum acceleration amplitude of the inner contents as the objective function. Using the nonlinear programming method, optimize the physical parameters damping coefficient C and elastic stiffness K of the paperboard cushion model, and compile the numerical simulation software. By testing the dynamic characteristics of typical paperboard cushions, the cushioning performance of paperboard cushions was analyzed and compared. In this paper, the dynamic performance of corrugated board cushion liner was tested by a large number of experiments. In this paper, ADAMS software is used to establish a system dynamics analysis model for corrugated board cushioning packaging. Based on the nonlinear mathematical model, the stiffness and damping characteristic model of the corrugated board cushioning system in the system and the mechanical characteristics of the main moving parts in the system under continuous impact load are analyzed, which explores a new method for studying the cushioning performance of corrugated board and the recovery of the development of China's plastic extruder market

while studying the cushioning performance of corrugated board, people are also improving the cushioning performance of corrugated board by changing the shape or structure of corrugated board. For example, the micro corrugated board is used as the lining to package perfume, cosmetics and small electronic products to replace the traditional EPE, EPS and other foamed plastics, which not only improves the compressive strength of the packaging, but also improves the grade of the packaging. Guangxi Guilin Chenguang paper products Co., Ltd. has developed a kind of reinforced sandwich corrugated board ("middle tile"). The "middle tile" is an excellent structure with ordinary corrugated board as the surface, and corrugated board and paper tube are set between the two layers of the board, which greatly increases the strength of the paper board. It not only retains the advantages of ordinary corrugated board, but also can adjust the thickness of the sandwich layer and the geometry of the sandwich layer, To adjust and change the strength and cushioning performance of corrugated board. Another example is the so-called three-dimensional corrugated paperboard liner. The outline of the outer edge of the substrate is consistent with the shape of the inner cavity of the packaging box. The packaging part of the substrate has depressions and bulges matching the shape of the packaged object, and the cushioning performance is better than that of pulp molded products. At the same time, the gap inside the liner can also be filled with straw of rice, wheat, hemp or cereal plants to prevent deformation due to extrusion and improve the cushioning and impact resistance. In Europe, kraft paper or old newspapers are rolled into paper balls for cushioning packaging. For example, PSP company in Bremen, Germany, has developed the production process of foam paper, which uses recycled old book waste paper and flour as raw materials, and forms foam paper through extrusion and foaming under the action of steam

although corrugated board has good shock absorption performance and is suitable for small load circulation environment, it is inevitable that large impact loads will occur during transportation, and the shock absorption capacity of corrugated board is somewhat inadequate. Compared with corrugated paper board, honeycomb paper board has good bearing capacity and bending resistance, and has better energy absorption and shock absorption capacity for large loads. If the advantages of the two are combined, the advantages can be developed and the disadvantages can be avoided. Corrugated cardboard is used to bear small loads, and honeycomb cardboard is used to bear occasional large impact loads. In the literature, the compression tests of corrugated board, honeycomb board and their combined structures were carried out, and the cushioning characteristic curves of the combined structure were compared with those of the other two materials. The combined structure has both advantages, and has good cushioning capacity for small load and large load. According to the prediction of relevant experts, the potential market of corrugated honeycomb composite paperboard is very huge, and its market demand will exceed hundreds of millions of square meters/year

using paper pad instead of foamed plastic as buffer material is not only conducive to environmental protection, but also can be recycled to reduce costs. Corrugated cardboard liner can not only block the product in the container, but also absorb energy when the product is impacted by the outside world, prolong the impact pulse time of the inner product, and has good cushioning performance. From the development and application of new corrugated board in recent years, the miniaturization of corrugated board, diversification of structure, small quantity, low cost and high quality are the future development trend of corrugated board

2 honeycomb paperboard liner

honeycomb paperboard is a new packaging material that has developed rapidly in China in recent decades. It has good toughness and resilience. The unique honeycomb sandwich structure provides excellent cushioning performance. It has higher energy absorption per unit volume in all cushioning materials. The honeycomb paperboard with high thickness can replace the EPS plastic foam cushion. There are two main types of honeycomb paperboard used as cushion liners: elastic type and folding type. They are mostly used to protect products in the form of local and corner protection. They are commonly used in rectangular commodities. They are also suitable for large electronic instruments, computers and furniture, large flat glass and glass products with large volume, fragile surface and high requirements for shock resistance and cushioning

the positioning inaccuracy of the static performance of the honeycomb paperboard was tested. Based on the establishment of the mechanical model, the mechanical properties and cushioning properties of the honeycomb paperboard were analyzed. The test proved that the honeycomb paperboard had excellent cushioning properties, specifically embodied elastic deformation and nonlinear elastic deformation. In this paper, the static mechanical properties of typical honeycomb paperboard cushion were tested, and the mechanical properties of several common cushioning materials were compared and analyzed. The results show that honeycomb paperboard cushion liner is more compressive and flexural than corrugated paperboard cushion, and its rigidity is better than that of foam plastic. It is a kind of cushion material with better toughness and resilience. Based on the drop impact test and vibration test, the paper [11] studied the cushioning and anti vibration performance of honeycomb paperboard with four different thicknesses, and obtained the empirical formula of dynamic cushioning curve and the characteristic coefficient of vibration transmissibility curve (peak frequency, transmissibility and damping ratio). The results show that the dynamic cushioning curve of honeycomb paperboard is concave, the opening is upward, there is only one minimum point, the impact acceleration waveform is similar to half sine wave, the impact action time is long, the impact energy absorbed is large, and it has good dynamic cushioning characteristics; The vibration transmission characteristics are multi-modal, which can be divided into primary and secondary, and have significant attenuation to high-frequency vibration

in recent years, people have done a lot of research on the performance of honeycomb paperboard cushion, which provides a basis for the application of honeycomb paperboard. In order to be in line with the international market, many well-known domestic electrical brands began to use honeycomb paperboard to replace EPS foam plastic liner in succession since 2001. For example, Haier's air-conditioning cabinets have begun to formally adopt honeycomb paperboard packaging materials in batches, which not only reduces the packaging cost and "white pollution", but also opens a "green channel" for the export of foreign trade enterprises

China's paper honeycomb industry started late, and the research and development of production line equipment, product structure design, product manufacturing and processing capacity, and the serialization, standardization and diversification of products have made slow progress. Honeycomb paperboard, as a new type of packaging material, has broad prospects. Solving a series of problems in current production technology is the premise of its further application. As an environmental protection cushion packaging liner, it will promote the development of export packaging in China

3 pulp molded products

pulp molding began in the 1960s. Checking whether the joints of the oil circuit system are tightened has the advantages of low manufacturing cost, no pollution to the environment, recyclability and so on. It has become an environmental friendly buffer material to replace EPS and other foamed plastics

on the basis of studying the cushioning performance, structure and load of pulp molded products, reference [12] proposed the cushioning mechanism of pulp molding, and simulated the response under load by using the finite element method. The research shows that the structure of pulp molded products plays a major role in the cushioning performance. In reference [13], starch adhesive was added to the pulp prepared from the pretreatment of waste carton, and a new pulp molded cushion was made by physical pore forming method after molding. Through the static compression test, the elastic state equation, static stress-strain curve and buffer coefficient stress curve of the new material are obtained. The experiment shows that the paper pulp molded buffer liner made by physical foaming method saves materials, has low cost and good air permeability, and has the advantages of general paper pulp molded materials and is unique. Reference [14] analyzed the static compression curve of rib structure unit, the limit load and maximum load ratio of elastic deformation of buffer structure unit, and the relationship between the number of buffer structure units and the maximum load by using the test method. According to the static compression curve of pulp molded buffer structure unit, the design principle of pulp molded buffer packaging structure was studied. The paper studies the cushioning performance of the structure of pulp molded products, and concludes that the structure of pulp molded products (such as wall thickness, height, side wall slope, bearing side length and transition fillet radius) has a great impact on its cushioning performance

while people are studying the cushioning performance, characteristics and cushioning mechanism of pulp molded products, they are also constantly developing new structure pulp molded products, such as closed and semi closed cavity pulp molded products. At present, pulp molded products are formed on a single convex or concave mold surface, so the products can only be open single-layer cavities. However, the open single-layer cavities change, the cavities are easy to deform under stress, with small bearing capacity and poor rigidity. The method to obtain the closed and semi closed cavity products is as follows: the first step is to combine the mold to form a combined mold cavity, which must have a

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