Development and direction of the hottest cushionin

Development and direction of cushioning packaging design (Part 1)

in order to protect goods from damage due to impact and vibration during circulation, the packaging implemented is called cushioning and anti vibration packaging, also known as cushioning packaging. With the development of economy and the increase of trans provincial and trans national transportation of products, people pay more and more attention to the cushioning packaging of products. The importance of cushioning packaging is to reasonably design the packaging structure to minimize the loss of goods in the process of transportation, loading and unloading and storage

overview of the development of cushioning packaging design theory

during the Second World War, with the transportation of various military supplies, especially high-precision electronic equipment as an inducement, Mindlin of Bell Laboratories and the research team led by him applied the vibration analysis theory in the mechanical field to the packaging field that has always relied on "exploratory method" or experience for analysis and design, Formed a unique "buffer packaging theory". In 1968, Newton put forward the boundary condition theory of packaging product damage, established the brittleness evaluation theorem and its test method, and was included in the American material test standard (AST promised to respond to the customer's question m within 2 hours). The groundbreaking work of Mindlin and Newton laid the foundation for the analysis and design of modern cushioning packaging

in the 1980s, based on the boundary condition theory of brittleness value, MTS Systems Co., Ltd. of the United States and the packaging School of Michigan State University jointly developed the (step) design method of buffer packaging, and later developed a more perfect six step method of buffer packaging design: determine the circulation environmental conditions; Product brittleness value estimation; Product redesign; Calculation of liner material; Design packaging system; The prototype of the packaging system has been tested since March 1, and the ASTM standards that should be implemented in each step are given, so that the cushioning packaging design theory has made rapid progress

in recent decades, scholars from various countries, including packaging scientists and technicians in China, have paid extensive attention to and actively invested in, which has greatly promoted the exchange and development of cushioning packaging design theory. In fields such as computer-aided design technology of cushioning packaging, impact and vibration response analysis of various linear and nonlinear cushioning packaging systems, analysis and design models of cushioning packaging systems, probabilistic design methods of cushioning packaging, etc, A series of important achievements have been made. In short, in the more than 40 years since Mindlin published his paper, great progress has been made in the research of cushioning packaging design theory. The research on the mechanical characteristics of cushioning materials, product brittleness evaluation, dynamic model and design method is becoming more and more practical and accurate, and the design practice of cushioning packaging is becoming more and more reasonable. The main achievements are reflected in the following aspects:

the theory of product cushioning and vibration isolation is established

the maximum acceleration value that a large number of products can withstand without physical damage or functional failure, that is, the product brittleness value

all major industrial countries have successively carried out the investigation and test of circulation environment, and achieved great results, laying a solid foundation for the packaging and transportation test of products

developed many advanced packaging test equipment, and applied computers to packaging test data processing and cushioning and anti vibration packaging design

many countries (including China) have formulated various packaging standards for cushioning and vibration prevention

problems in buffer packaging design theory

although the research on buffer packaging technology has made great progress, there are still a lot of problems in buffer packaging design theory and method, which need to be further studied and explored, mainly reflected in the following aspects:

the proposed method of damage boundary to characterize the vulnerability of goods is based on the theory that packages are regarded as a single degree of freedom linear packaging system, However, actual products, especially precision electronic instruments, have multiple fragile components, and different impact frequencies and waveforms produce different impact amplification rates for products, and different responses of products form different excitation and impact amplification rates for fragile components of products. Therefore, as an important basis for cushioning packaging design, the brittleness evaluation method itself needs to be developed, but so far, there has not been a more authoritative and more reasonable experimental theory and method

in packaging engineering, dealing with problems according to single degree of freedom has its practicality and simplicity. It is also very important to study the basic laws of packaging dynamics. But theoretically, any kind of product can be regarded as having infinite degrees of freedom. Even if only a limited number of fragile components are considered, the packaging of many items must be treated as "one or more degrees of freedom in order to provide a reasonable packaging design. There are" basic situations ": one is that the packaging content itself is a multi degree of freedom system, such as some instruments and equipment, and their quality The size and distribution of elastic elements and damping elements are equivalent to that of buffer packaging system. If they are forcibly simplified into a single degree of freedom system, large errors may be caused; The other is that there are sub packages in large packages, such as container transportation. However, the problem of multi degree of freedom packaging has not been included in the current domestic and foreign standards

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