What Is an Insulated Shipping Container?

Insulation container refers to the "container" which keeps heat by its own thermal insulation device to prevent heat exchange between the inside and outside of the box and keep the temperature inside the box constant. The general term for "containers" for transporting goods that require temperature control, such as frozen goods, refrigerated goods, and insulated goods. According to the provisions of international standards, various thermal insulation containers have different requirements for thermal insulation and air tightness. China's thermal insulation containers are divided into thermally insulated containers, consumable refrigerant refrigerated containers, mechanical refrigerated containers, heating containers, refrigerated and heated containers, and so on. Insulated containers have no cooling and heating equipment, and the walls of the boxes are provided with thermal insulation materials such as foam with low thermal conductivity. Heating containers are equipped with heating devices. They are used in cold areas to prevent the frozen goods from being shipped or to load goods that require thermal insulation. Refrigeration and heating containers generally use a combination of mechanical refrigeration devices and resistance heaters. ^[1]

Insulation container refers to a kind of container whose all walls are insulated with a material with low thermal conductivity, which is used to transport goods that need to be refrigerated and insulated.

There are usually the following types of insulated containers:

Refrigerated Container.

This is used

Thermal insulation containers include refrigerated containers with refrigeration units and insulated containers without refrigeration units. The essence of the characteristics of the thermal insulation box is its thermal insulation layer, air tightness and heat leakage indicators. At present, an integrated refrigerated container is often used. The structure of the 1AA refrigerated container is shown in the following figure. In fact, now the newly manufactured refrigerators have replaced the 1AA type by the higher 1AAA type. Their structure is basically the same, with only differences in height.

Thermal insulation container box structure

In order to reduce the box's own mass as much as possible, the main frame of the heat-insulating box should be made of lightweight and high-strength materials as much as possible. Consider using aluminum alloy rods or traditional steel profiled rods to form the upper and lower test beams, the door structure and even more components. Inside the box, the outer wall can be made of aluminum alloy plate or glass steel plate. In order to meet the requirements of perishable cargo transportation, most of the current use is made of stainless steel or stainless steel (MGSS ----- Muffler Grade Stainless Steel). . In order to ensure the tightness of this kind of box, its roof should be whole and no seams should be allowed to prevent outside rain or seawater from infiltrating into the heat insulation layer or even the heat preservation box. Avoid vertical seams at the top of the box. For the top of the heat-insulated box that requires cargo suspension devices, there should be a cargo rail. The design of the rail should be able to withstand the cargo load proposed by the owner or the larger of 2 × 1 490kg / m. The appropriate position near the top of the box inside the box should be marked with a red line that limits the height of the loading to facilitate the smooth flow of cold air in the box. In order to make the temperature in all parts of the box equal, the top surface of the bottom structure of the box must be laid with an aluminum "I" cross section ventilation rail plate. When necessary, holes can also be made in the web of the ventilation track surface to facilitate the circulation of cold air at the bottom of the box. Below the track is a thermal insulation layer. On the bottom surface of the thermal insulation layer, there must also be an outer floor as a backing. In addition, every corner of the bottom of the box should be provided with a trap or a rubber valve nozzle (Kazzo) for draining the condensed water and other moisture in the box. All doors should have a backstop function. . The inner wall lining of the whole box should be made of stainless steel plate with vertical corrugated ribs.

Thermal insulation container

The six faces that make up the box all include a thermal insulation layer. Whether it is a prefabricated thermal insulation board or an on-site foamed thermal insulation layer, a certain strength is required. More importantly, it must have considerable thermal insulation capacity and Higher sealing capabilities. In order to meet the above requirements, metal parts that penetrate the entire thickness of the insulation layer, that is, heat bridges, should be avoided, and corresponding sealing measures should be taken at the rivets and any joints.

Technical components of thermal insulation container

In order to reduce the box's own mass as much as possible, it should be used as much as possible to construct the box frame. Can consider using aluminum alloy rods or traditional steel profiled rods to form the upper and lower measuring beams, the door structure and even more elements. The inner and outer surface of the box can be composed of aluminum alloy plate or glass steel plate. In order to better meet the requirements of perishable cargo transportation, stainless steel plates (HGSS HIGH GRADE STAINLESS STEEL) or ferritic stainless steel (MGSS Muffler Grade) are currently used. Stainless Steel) also known as stainless iron or stainless steel.

Air-conditioning device for thermal insulation container

Generally speaking, by changing the gas composition in the refrigerator, the breathing volume and metabolic strength of fresh fruit are weakened, so that the process of ripening is slowed down and the means to achieve freshness is called "Control Atmosphere" And "Modified Atmosphere." Modified atmosphere (CA for short) is to change the composition of various controlled gases in the box in a short period of time and keep them at a set level.

The change of the gas composition in the box by the air conditioning (MA for short) is often individual, gradual and controlled, and the effect is not as ideal and rapid as the air conditioning method. At present, more fresh air conditioning solutions have appeared, such as the Advanced Transport A Atmosphere Control (ATAC) system and the IN-Transit Atmosphere Control (INTAC) system.

Thermal insulation container refrigeration device

(1) Refrigeration system

The refrigeration system used for refrigerated containers must meet the following principles:

a. Ensure that the quality of the perishable goods shipped meets the relevant requirements of the owner;

b. Uninterrupted adjustment of its cooling capacity within a certain range;

c. The temperature and humidity control in the box can reach a certain accuracy;

d. Appropriate ventilation, so that the ethylene and carbon dioxide concentration in the box is appropriate;

e. The working conditions in the box can be automatically detected and recorded.

(2) Cooling method

a. Cold. Ice cold is the most primitive way to use ice or ice salt to dissolve heat.

b. Liquid gas refrigeration. It uses liquid nitrogen (Liquid Nitrogin, air or carbon dioxide to absorb latent heat during gasification and part of the sensible heat to cool it.

c. Cold plate cooling. Refrigeration method using low temperature eutectic liquid to store heat and then absorb heat

d. Absorption refrigeration. Refrigeration method using vehicle waste heat or direct fuel.

e. Mechanical compression refrigeration. At present, it is the most mature refrigeration method widely used in various countries around the world.