Pest control packaging technology can be divided into the following five types:
(1) Inflatable packaging. Inflatable packaging is a kind of packaging technology method that uses inert gas such as carbon dioxide gas or nitrogen to replace the air in the packaging container, so it is also called gas replacement packaging. This 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 microorganisms, enzyme activity and breathing strength of fresh products, To achieve the purpose of anti-mildew, anti-corrosion and preservation.
(2) Vacuum packaging. Vacuum packaging is a kind of packaging method in which an article is placed in an airtight container and a vacuum is drawn before the container is sealed, so that there is basically no air in the sealed container.
General meat commodities, grain processing commodities and certain products that are easily oxidized and deteriorated can be vacuum packaged. Vacuum packaging can not only avoid or reduce fat oxidation, but also inhibit the growth of certain molds and bacteria. At the same time, when heat sterilizing it, since the gas inside the container has been eliminated, the heat conduction is accelerated. The high-temperature sterilization efficiency is improved, and the packaging container is not broken due to the expansion of the gas during the heat sterilization.
(3) Shrink packaging. Shrink packaging is a packaging technology method that wraps the article (or inner package) with a shrink film, and then heats the film appropriately to shrink the film and adhere to the article (or inner package).
Shrink film is a kind of polyethylene film that has been subjected to special stretching and cooling treatment. Since the film produces residual shrinkage stress during directional stretching, this stress will be eliminated after a certain amount of heat, so that it will shrink sharply in both the horizontal and vertical directions At the same time, the thickness of the film is increased. The shrinkage rate is usually 30% to 70%. The shrinkage force reaches the maximum value during the cooling stage and can be maintained for a long time.
(4) Stretch packaging. Stretch packaging is a new packaging technology that has been adopted since the 1970s. It is developed from shrink packaging. Stretch packaging relies on mechanical devices to stretch and tightly wrap elastic films around the packaged parts at room temperature, and A packaging method that seals at the ends. Since the stretch packaging does not need to be heated, the energy consumption is only one-twentieth of the shrink packaging. Stretch packaging can bundle individual items, and can also be used for collective packaging such as pallet packaging.
(5) Deoxygenated packaging. Deoxygenated packaging is a new type of deoxygenated packaging method following vacuum packaging and inflatable packaging. Deoxygenated packaging is to use a deoxidizer that can chemically react with oxygen in a sealed packaging container to remove oxygen in the packaging container to protect the contents. The deoxygenation packaging method is suitable for some items that are particularly sensitive to oxygen, and is used in food packaging that even a small amount of oxygen will promote quality deterioration.
Outdoor bench refers to the seating facilities used in outdoor places, often commonly found in parks, squares, leisure areas, scenic spots and other outdoor environments. The classification of outdoor benches can be introduced according to many aspects such as material, shape and function.
First, classification by material
1. Wooden bench: Wooden bench is one of the most common outdoor benches, usually made of natural wood, with natural and environmentally friendly characteristics. Wooden benches are usually made of solid wood or artificial wood, and the surface is treated with waterproof and anti-corrosion, which can adapt to various climatic conditions in the outdoor environment.
2. Metal bench: Metal bench is made of metal materials, such as cast iron, steel, etc. The metal bench is durable, corrosion resistant, easy to clean and is suitable for all kinds of outdoor environments.
3. Stone bench: Stone bench is made of marble, granite and other stone, which has the characteristics of good texture and beautiful appearance. Stone benches are generally suitable for high-end places such as garden scenic spots and can be integrated with the surrounding environment.
5. Combined material bench: Combined material bench refers to the bench made of different materials, such as the combination of wood and metal, stone and plastic combination. Combined material bench can usually combine the advantages of different materials, more in line with the needs of different outdoor environments.
2. Classification by shape
1. Linear bench: Linear bench is the most common shape of bench, generally composed of a row of seats, forming a straight line arrangement. The linear bench is suitable for outdoor places with large pedestrian flow and can provide more seats.
2. Arc bench: Arc bench is an arc bench composed of multiple seats, usually used in a ring seat area or landscape area. The curved bench can not only provide comfortable seating, but also increase the aesthetics of the place.
3. Wavy bench: The wavy bench is a bench composed of multiple seats in the shape of undulating waves, giving people a sense of movement and flow. The wavy bench is suitable for parks, squares and other places that need to increase vitality and fun.
4. Round bench: A round bench is a round bench composed of a number of seats, which is usually used in outdoor recreation areas and can provide a place for groups to gather.
3. Classification by function
1. Leisure bench: Leisure bench is a common form of outdoor bench, it can provide comfortable seats, so that people can relax in the outdoor environment.
2. Viewing bench: Viewing bench is usually set in a scenic outdoor environment, providing comfortable seats for people to enjoy the scenery.
3. Sitting bench: Sitting bench is usually set in parks, squares and other places with large traffic, to provide people with a short rest and relaxation.
4. Cool pavilion bench: Pavilion bench refers to a form of combination of bench and pavilion, which can provide sunshade, rain prevention and other functions, suitable for outdoor leisure areas.
In short, the classification of outdoor benches can be divided from many aspects such as material, shape and function. Different outdoor environments and needs need to choose a suitable bench type to provide comfortable and beautiful seating facilities
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