Experimental study on static cushioning performanc

Experimental study on the static cushioning performance of paper-based space composite materials

Abstract] through the static compression experiment of the cushioning material formed by the combination of waste pulp and chicken feathers, the static force deformation curve, stress-strain curve, cushioning coefficient strain curve and elastic state equation of the material are obtained, which provides a theoretical basis for the promotion and application of new materials in cushioning packaging

key words: waste pulp; Chicken feather; Static cushioning performance

natural fiber cushioning material is a cushioning material based on natural fibers and bonded with adhesives. It has good cushioning performance and wide applicability. It is a cushioning material with excellent comprehensive performance. The technology of manufacturing buffer materials with natural fibers developed from Europe and began to use animal horsehair as raw material. Due to the decreasing horsehair resources, manufacturers have to look for alternative raw materials with meticulous workmanship, such as Instron, MTS, Zwick and other companies' fixtures 1, such as animal hair, bristles, brown fibers, sisal fibers and planting fibers. With the expansion of the application of buffer materials, The research on natural fiber cushioning materials is also more in-depth, especially in recent decades, Europe and the United States have developed a series of new products of natural fiber cushioning materials

waste paper is used as paper base material, chicken feather fiber with light weight and good resilience is used as mixed composite material, and buffer packaging material is obtained by one-time molding. New materials have low price and cost, good cushioning performance, and there is no pulping in the production process, no acid and alkali and other waste liquid discharge, which is in line with the trend of developing green bags. In addition, we need to pay attention to loading under charged state

1 experimental materials and methods

1.1 experimental materials

1) waste pulp. Tear up the waste paper, soak it in hot water, and optimize the proportion according to the orthogonal test (20g waste paper, 0.56g deinking agent, 0.4g sodium hydroxide, 0.4g sodium silicate. The equipment adopts the equipment of electronic universal experimental machine type to carry out a series of experiments, 8g hydrogen peroxide 0.4g). Deinking the pulp, filtering and drying

2) chicken feather fiber. After cleaning the chicken feathers, removing impurities, decolorizing and removing stems, dry the soft chicken feathers and crush them with a grinder

1.2 experimental instruments

balance, experimental electric crusher, electrothermal thermostatic water bath box, electrothermal thermostatic drying box, hydraulic universal testing machine, etc

1.3 experimental method

1) mix the experimental materials, starch glue made by hot method and other elements according to the optimization results of orthogonal test (12g dry waste pulp, 10g chicken feather fiber, 10g adhesive, 6G foaming agent, water bath temperature 40 ℃), filter and form with aluminum alloy mold, and dry to obtain buffer material

2) carry out static compression test on materials with 10t hydraulic universal testing machine

2 experimental results

the experimental sample is cylindrical, with a density of 0.256g/cm3, a thickness of 16mm and a diameter of 83mm. The pressure and deformation data recorded at 26 loading points are shown in Table 1

3 Analysis of experimental results

3.1 initial elastic coefficient and elastic state equation

analysis of the trend of the original data points in Figure 1 shows that the new buffer material shows nonlinear characteristics and conforms to the tangent curve elastomer law. The mathematical model of its elastic state equation can be assumed as:

where: K0 is the initial elastic coefficient; DB is the compression limit; X is the compression deformation; F is the pressure. According to experience and actual situation, DB (initial value/2) =8mm is selected. After calculating each group of data, the average value of initial elastic coefficient k0=0.17547 is obtained, and the elastic state equation is: f=0.8937tan0.19635x

Figure 1 shows the relationship between the theoretical curve (smooth line) obtained from the elastic equation of state and the measured data points

3.2 buffer coefficient c

buffer coefficient C and stress σ、 strain ε、 The relationship of deformation energy E is as follows:

according to the above four formulas, figure 2 and figure 3 can be obtained from the force deformation data measured in the experiment. The small dots in the figure are the values calculated from the measured data, and the curve is the result of least square fitting

4 conclusion

the waste paper and chicken feather with sufficient sources, low cost and recyclable are used as raw materials. The combined buffer material has the characteristics of low density and good buffer performance; The characteristic curve and empirical formula obtained from static compression test provide basic data for the application of new materials. (Wen/Mao Zhongyan)

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