Shockproof packaging techniques

There are four main methods for shockproof packaging: comprehensive shockproof packaging, partial shockproof packaging, suspension shockproof packaging, and shockproof packaging of joint methods.
First, the overall method of shock protection The so-called comprehensive shockproof packaging method, refers to the contents of the entire package and the outer package filled with shock-proof materials for shockproof packaging method, according to the different shockproof materials used can be divided into the following categories:
1. Compression packaging uses elastic materials to pack or reinforce fragile items so that they can absorb the energy of vibration or impact and guide them to the highest part of the contents. The so-called elastic materials are generally filamentous, flake and granular, so that they can also be well-packed for products with complex shapes, and can effectively absorb energy when shockproof, disperse external forces, and effectively protect the contents.
2. The floating packaging method and the compression packaging method are basically the same. The difference is that the elastic material used is a small piece of padding. These materials can be displaced and flow. This can effectively fill the gap of the directly-forced part and disperse the contents. impact.
3. The wrapping and packaging method uses various types of sheets to wrap the contents of a single package into an outer box. This method is mostly used for shockproof packaging of small items.
4. The box-packaging method uses a model to convert a polystyrene resin or the like into a mold box having the same shape as that of the product, and uses it to package the product to achieve a shockproof effect. This method is mostly used for the packaging of small, lightweight products.
5. The in-situ foam packaging method is a kind of shockproof packaging technology in which the contents and the outer box are filled and the foamed material is filled in between. This method is very simple. The main equipment includes containers containing isocyanate and polyol resin and spray gun. When using, firstly adjust the temperature and pressure in the container containing the two materials as required, and then use two materials. Mixed, with a single pipe leading to the spray gun, sprayed by the nozzle. The ejected compound starts to foam and expand after 10 seconds, and it expands and expands to 100 to 140 times its original volume in less than 40 seconds. The resulting foam is polyurethane and becomes hard and semi-rigid after one minute. Foam. These foams will wrap around in any shape of item. The specific procedure for foaming is:
a. Spray the compound into the bottom of the outer box with a spray gun and allow the foam to expand into a bread shape;
b. A layer of 2 μm polyethylene film is quickly covered on the foam that continues to foam;
c. Place the items to be packaged into a foam to form a nest;
d. Rapidly cover a 2μm polyethylene film on the article;
e. Then continue to spray polyurethane compound for foaming;
f. The outer package is capped and sealed.
Figure 8-1 shows a simplified diagram of the in-situ foam packaging process.

Second, part of the shockproof packaging techniques for good overall products and products with inner packaging containers, only in the corner of the product or inner packaging or local places using shockproof material to pad, this method is called partial shockproof packaging method. The shockproof materials used mainly include foam plastic shockproof pads, inflatable plastic film shockproof pads and rubber springs.
Figure 8-2 shows part of the shockproof packaging schematic.

This method is mainly based on the characteristics of the contents, using less shock-proof materials, in the most suitable part of the liner, and strive to obtain a good shock effect, and reduce packaging costs. This law applies to the packaging of large quantities of items, and is currently widely used in the packaging of televisions, tape recorders, washing machines, and instrumentation.
Third, the suspension type shockproof packaging method For some valuable and vulnerable items, in order to effectively ensure that during the distribution process is not damaged, often using a solid outer packaging containers, the items with a strap, rope, rings, springs and other items hanging outside The packaging does not come into contact with the walls. These supports act as elastic dampers.
Figure 8-3 shows the schematic diagram of suspension type shockproof packaging.

Fourth, the joint method in the actual buffer packaging often two or more shockproof methods with the role. For example, both padding and amorphous cushioning materials are added to make the product more fully protected.
Sometimes, dissimilar materials can be used in combination. For example, dissimilar materials of equal thickness can be used in parallel, or dissimilar materials of equal area can be used in tandem.