Modern packaging must have four major functions: protection, convenience, sales, and information. Among them, the protection function is the most important, because the goods are not well protected and are damaged during the circulation, and other functions are affected.
Goods will be affected by various external forces during the transportation process, such as the bumps of trains and cars; the vibration of radio landings; the impact of ships on waves; and the drop in handling and loading and unloading, which may cause damage to packaged goods. If you do not attach importance to and take effective protective measures, the goods will be subject to severe punishment. In the process of circulation, commodities of various countries in the world have been damaged to varying degrees, and our country is also very serious. The annual losses caused by improper packaging are as high as nearly RMB 100 million. Therefore, research on protective measures in the circulation of commodities is an important part of the packaging discipline.
One of the effective measures to support the breakage of a product is cushioned packaging, and the effectiveness of the cushioned packaging depends on the performance of the cushioning material and the packaging technology.
Countries all over the world attach great importance to the research and development of packaging buffer technology and buffer materials. Polyurethane field foam packaging technology is an important part of modern packaging technology. It fully embodies the characteristics of high speed, high efficiency and high quality, and conforms to the development direction of modern packaging technology.
Polyurethane foamed packaging is a packaging technology developed in developed countries in the early 1980s. This packaging technology has been favored by users because of its amazing packaging speed and high quality cushioning effect. Nowadays, on-site blister packaging has become very popular in the United States, occupying 80% of the market. The world-famous HP company's products have all used polyurethane styrofoam packaging.
In many developed countries, polyurethane field foam packaging technology is widely used in the packaging of electronics, military industry, light industry, construction industry, machinery industry, food industry and other fields.
The United States’ military packaging is second to none in the world, and the land, sea and air forces have adopted polyurethane styrofoam packaging technology.
Characteristics of Polyurethane Field Foamed Packaging Through special equipment, the two different chemical raw materials are mixed in a very instant and sprayed by a spray gun to make it foam. The foam is even and the texture is soft. It can be foamed within 25 seconds. Within one minute, a product can be packaged without any mold. It can be wrapped tightly according to the shape of the product and it is stable and reliable. It is also possible to make simple molds for prefabrication to suit mass production. The equipment is small in size, light in weight and small in footprint. There are a few square meters of workshops to operate. The foam packaging is available at any time, so there is no need to store the product in the warehouse. The spray gun of the foaming equipment is of the self-purification type. Each time it is used, it is immersed in a special solution, and daily maintenance and frequent maintenance are not required. The operation is simple, one will learn, without special technical personnel and complicated technical training. According to different weight and characteristics of product packaging, choose different types of raw materials, buffering effect is good. Do not pollute the work site, no harm to the human body, no corrosion to the product. Polyurethane field foam packaging technology is suitable for product packaging with many varieties, small batches, and irregular product appearance.
Polyurethane field foam packaging technology has broken the traditional buffer packaging technology and procedures. At present, widely used polystyrene foam is used as a buffer material in China. The basic procedures for designing and processing are as follows.

Packaging Design → Mold Design → Mold Making → Processing → Picking
│
│
Treasury ←——————————————————┘

It is clear that a buffer package must be completed in such a tedious process that it encounters many problems and difficulties in each process. From design to processing, at least three months or even longer. Moreover, since the polystyrene foam is processed to contain a large amount of moisture and cannot be used immediately, there must be a period of air drying. For products with many varieties and small batches, it is even more difficult and difficult to produce a set of molds, laborious and expensive.
In addition, there are many shortcomings in expandable polystyrene packaging, such as poor elasticity, not suitable for packaging of fragile items and precision instruments. Processing and molding require a relatively expensive metal mold. The finished product takes up a lot of space. The finished molded product contains moisture and cannot be used immediately. It needs to be dried first.
Polyurethane foamed packaging makes up for many of the shortcomings of expandable polystyrene foam. China's foreign trade system to solve the export of goods packaging, introduced in 1984 the United States polyurethane on-site foam packaging system, but due to limited foreign exchange, can not be widely used.
Beijing Jinke Polyurethane Technology Co., Ltd. has developed and produced domestic polyurethane foaming equipment that has already been put on the market. Its performance is not lower than that of imported equipment of the same type, and its price is only half that of imported equipment. On-site foaming packaging materials have also been made domestically, and they are environmentally friendly raw materials that are free of fluorine, and their buffering performance is not inferior to imported raw materials.
The localization of polyurethane field foam packaging technology has provided conditions for promoting the progress of packaging technology in China and improving the quality of packaging.
China has formulated a national standard for polyurethane foam packaging on site, which makes the on-site foam packaging technology more mature, more standardized, and more complete, and has effectively promoted the development of this technology. At present, most of China's military-industry cutting-edge products, electronic instruments, computers, handicrafts, and export commodities have adopted on-site foam packaging, and have achieved good results.
Tests have shown that on-site foaming packaging material has good cushioning properties, and it can absorb vibration and impact energy of 60% to 80%, which is much superior to the cushioning properties of expandable polystyrene foam. Therefore, as a product of the buffer packaging, its protective performance is very reliable. (From "China Packaging News")