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Performance Analysis package cushioning materials


Stress (Gm-ost) curve can be seen that: (1) the basic shape of the curve is similar to both the parabolic shape to open up II; the quality of different sizes, different thickness of the material, the thickness of the larger, making the extreme point different positions, with the thickness, extreme point shift to the lower right corner. In the design manual, a variety of cushioning materials for a maximum cushioning coefficient curve for users should choose. Third, the elasticity analysis 1. Elasticity of the mechanical model in the packaging, cushioning material generally regarded as the ideal elastomer, that is, vibration and repeated several times in a long time under the impact of its flexibility remains uniform, no change. Elastic properties of materials, usually to characterize the elasticity of the material. Linear elastic stress-strain buffer between the material consistent with Hooke's law, the product of the force is F = KX, where K is the coefficient of elasticity. If the bandits hiding packages free fall from a height h at the impact of the base surface, when the linear liner (linear elastic) compression generated by the maximum deformation of Xm, the product of all the gravitational potential energy into linear elastic strain energy, and its pad size is equal to the linear restoring force kxm work done on the product. Under the law of conservation of mechanical energy, packaging parts in the process of drop impact expression of the energy conversion products for the togaxm )=~,) ax is the maximum impact acceleration Gm: Gm = J2. Elasticity by the formula (7) can be seen in the product weight and drop height H w unchanged, the product is proportional to the maximum acceleration G and the buffer material is to select a suitable K value of the buffer material, so that products due to external shocks arising from the product may be subject to the maximum acceleration is less than the allowable acceleration (ie, fragility). It can be seen, for the buffer material, the elastic coefficient K is the characterization of materials, an important parameter buffer capacity. The actual elastic buffer, from which the force - deformation curve, quite complex. Under the force - deformation curve (F-X), or stress - strain (6, a £) curve of the buffer material into linear and nonlinear elastic materials, elastic materials into two categories. Linear elastic material is divided into elastic material tangent, hyperbolic tangent elastic material, elastic material with three rules of functional type elastic material. Specific classification is shown in Figure 5-9. Figure 5 Figure 7 hyperbolic linear material model Figure 8 Figure 9 irregular three functional type IV resilient cushioning material recovery with the ability of the original size and shape is called elasticity. Deformation of the buffer after the material in each can not be completely restored to its original shape and size. After several buffer the impact of the role of materials, the structural changes in the larger size, on the one hand lead to stress-strain curves of the material changes affect the buffer performance, smaller size of the other material,[link widoczny dla zalogowanych], generated inside the container in the outer gap, prone to secondary impact,[link widoczny dla zalogowanych], both of which may increase the possibility of product damage. Resilience of products through its spring rate to describe. If the spring rate R, the raw material thickness To, the compressed thickness of Te,[link widoczny dla zalogowanych], then k = (To-Te) / To × 100% ( In order to increase the resilience of the buffer material, in use before materials, pre-stress management, so that plastic deformation, which to some extent, compensate for the impact of the buffer material in the initial permanent deformation under external force,[link widoczny dla zalogowanych], giving the size of the buffer material and adequate protection products designed to bring greater reliability . V. creep resistance creep refers to the buffer material under static external force, with time the deformation of a corresponding increase of the phenomenon. Creep is also a material in plastic deformation under external force caused. Product long-term storage, the buffer material will creep, resulting in occurrence of the gap between products and gaskets, causing adverse effects. Therefore,[link widoczny dla zalogowanych], the buffer material should have good creep resistance. Buffering capacity of the material creep creep rate usually Cr, ie Cr = (To-Tu) / To × 100% (9) Where: To a material thickness before compression deformation Tu thickness of a material in the flow of packages Because the process of creep is inevitable, with the result that the smaller size of the material structure, which produces gaps in the packaging inside the container, resulting in product damage rates. To solve this problem, likely to flow of environmental conditions and flow cycle, considering the size of changes brought about creep, design an appropriate buffer size of the structure can also choose to have good creep resistance of the cushioning material. VI, conclusions /,, when a hundred dagger flexibility, vibration resistance, cushioning, flexibility and creep back to the buffer material is important mechanical properties, of course, also the temperature stability of buffer materials, humidity stability, chemical stability, etc. and other characteristics. In this paper, the mechanical properties of the buffer to make a detailed analysis of rational choice helps packaging designers packaging materials.

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