Principles and Applications of Five Major Pest Control Techniques

The shrink film is a polyethylene film that has been specially stretched and cooled. Since the film generates residual shrinkage stress when it is stretched by orientation, the stress is relieved by a certain amount of heat, causing sharp contraction in both the horizontal and vertical directions. While increasing the thickness of the film, the shrinkage is usually 30-70%, and the shrinkage force reaches its maximum value in the cooling stage and can be maintained for a long period of time.

Anti-insect packaging technology can be divided into the following five kinds:

(1) Inflatable packaging. Inflatable packaging is a packaging technology method that replaces air in a packaging container with an inert gas such as carbon dioxide gas or nitrogen, and is therefore also referred to as gas replacement packaging. This packaging method is based on the characteristics of aerobic microorganisms' aerobic metabolism, changing the composition of gases in sealed packaging containers, reducing the concentration of oxygen, inhibiting the physiological activity of microorganisms, the activity of enzymes, and the breathing intensity of fresh products. To achieve anti-mildew, anti-corrosion and preservation purposes.

(2) vacuum packaging. Vacuum packaging is a kind of packaging method in which after the articles are packed into the airtight containers, the vacuum is taken before the containers are sealed so that there is substantially no air in the sealed containers.

General meat products, processed grain products, and certain easily oxidatively degraded products 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 heat-sterilizing it, since the gas inside the container has been eliminated, heat conduction is accelerated. The high-temperature sterilization efficiency is improved, and the packaging container is also prevented from being broken due to the expansion of the gas during heat sterilization.

(3) shrink packaging. Shrink wrapping is the use of shrink film wrap articles (or inner packagings) and then heat the film appropriately so that the film shrinks tightly to the item (or inner package) packaging technique.

The shrink film is a polyethylene film that has been specially stretched and cooled. Since the film generates residual shrinkage stress when it is stretched by orientation, the stress is relieved by a certain amount of heat, causing sharp contraction in both the horizontal and vertical directions. While increasing the thickness of the film, the shrinkage is usually 30-70%, and the shrinkage force reaches its maximum value in the cooling stage and can be maintained for a long period of time.

(4) Stretch packaging. Stretch packaging is a new packaging technology that began in the seventies. It was developed from shrink packaging. Stretch packaging relies on mechanical devices to stretch and wrap elastic films around the package at room temperature. A method of packaging that seals at its end. Since stretch packaging does not require heating, it consumes only one-twentieth of the energy of shrink packaging. Stretch wrap can be used to bundle single items, but it can also be used for packaging such as pallet packaging.

(5) Deoxy packaging. Deoxidation packaging is a new type of oxygen removal packaging method after vacuum packaging and air-packing. The deoxygenation packaging is in a sealed packaging container, and uses a deoxidizer that can react with oxygen to react with it to remove the oxygen in the packaging container so as to protect the contents. The deoxygenation packaging method is suitable for certain items that are particularly sensitive to oxygen and used in food packaging where even a trace amount of oxygen can contribute to deterioration.