Introduce 5 kinds of insect proof packaging technology

The shrink film is a specially stretched and cooled polyethylene film. Because the film produces residual shrinkage stress during directional stretching, the stress is removed after a certain amount of heat, causing sharp shrinkage in both the lateral and longitudinal directions. At the same time, the thickness of the film is increased, the shrinkage rate is usually 30-70%, the shrinkage force reaches a maximum in the cooling stage, and can be maintained for a long time.

Insect packaging technology can be divided into the following five types:

(1) Inflatable packaging. Inflatable packaging is a packaging technique that replaces air in a packaging container with an inert gas such as carbon dioxide gas or nitrogen gas, and is therefore also referred to as a gas replacement package. The packaging method is based on the characteristics of aerobic microbial aerobic metabolism, changing the composition of the gas in a sealed packaging container, reducing the concentration of oxygen, inhibiting the physiological activity of the microorganism, the activity of the enzyme, and the respiratory intensity of the fresh product. To achieve the purpose of anti-mildew, anti-corrosion and preservation.

(2) Vacuum packaging. Vacuum packaging is a packaging method in which an article is placed in an airtight container and a vacuum is applied before the container is sealed, so that there is substantially no air in the sealed container.

General meat products, grain processing products, and certain products that are susceptible to oxidative deterioration can be vacuum packed. Vacuum packaging not only avoids or reduces fat oxidation, but also inhibits the growth of certain molds and bacteria. At the same time, when it is heat-sterilized, since the gas inside the container is eliminated, the conduction of heat is accelerated. The high-temperature sterilization efficiency is improved, and when the heat sterilization is avoided, the packaging container is broken due to the expansion of the gas.

(3) Shrink packaging. Shrink wrap is a packaging technique in which an article (or inner wrapper) is wrapped with a shrink film and then the film is appropriately heat treated to shrink the film and adhere to the article (or inner wrapper).

The shrink film is a specially stretched and cooled polyethylene film. Because the film produces residual shrinkage stress during directional stretching, the stress is removed after a certain amount of heat, causing sharp shrinkage in both the lateral and longitudinal directions. At the same time, the thickness of the film is increased, the shrinkage rate is usually 30-70%, the shrinkage force reaches a maximum in the cooling stage, and can be maintained for a long time.

(4) Stretch packaging. Stretch packaging is a new packaging technology adopted in the 1970s. It is developed from shrink packaging. The stretch packaging relies on mechanical means to stretch and tightly wrap the elastic film around the package at room temperature. A method of packaging that is sealed at its ends. Since stretch packaging does not require heating, the energy consumed is only one-twentieth of the shrink packaging. Stretch packaging can be used to bundle a single item or a collection package such as a tray package.

(5) Deoxidation packaging. Deoxidized packaging is a new type of oxygen removal packaging method that emerged after vacuum packaging and pneumatic packaging. The deoxidized package is reacted with a deoxidizing agent capable of reacting with oxygen in a sealed packaging container to remove oxygen from the packaging container for the purpose of protecting the contents. The deoxygenation packaging method is suitable for certain items that are particularly sensitive to oxygen and are used in food packaging where even a small amount of oxygen can cause deterioration in quality.