Rice fresh-keeping packaging bag A Japanese company introduced a strong sealing bag, which is made of a plastic called “Cikron†and has an excellent oxygen barrier function. It is used to package new rice. The preservation effect is particularly good, and the color, aroma, and taste of rice can be maintained for a long time, and the carbon dioxide generated in the bag has the effect of preventing insects and mildew.
A new way to keep fruits and vegetables fresh A company in the United States has developed a new method that keeps cut fruits and vegetables fresh. The researchers used cheese and acetylated glycerol extracted from vegetable oils to make a special covering that could prevent the transparent, edible, thin film-free slivers from sticking to the surface of cut vegetables and fruits. Dehydration prevents blackening of the fruit and prevents the intrusion of microorganisms.
Japanese experts of fruit and vegetable cling film have developed a disposable fruit and vegetable cling film, which consists of two highly-permeable nylon semi-packing machines' target=_blank> transparent film, with high osmotic pressure between the two layers. Sugar syrup. The use of this cling film to package fruits and vegetables, can slowly absorb the water seeping from the surface of fruits and vegetables, so as to achieve the purpose of preservation.
Edible fruit preservative British company has made an edible fruit preservative, which is a translucent emulsion formulated from sucrose, starch, fatty acids and polyesters. It can be sprayed, painted or impregnated. Covering the surface of fruits such as apple, citrus, watermelon, banana and tomato, the freshness can reach over 200 days. Because this preservative forms a layer of sealing film on the surface of the fruit, it can prevent oxygen from entering the interior of the fruit, thus prolonging the ripening process of the fruit and serving as a preservation effect. This preservative can be eaten with fruit.
Fresh fruit packaging box A Japanese paper company produced a fresh fruit packaging box. It is to add a layer of polyethylene film on the corrugated paper lining of the corrugated carton, and then apply a waterproof wax coating containing a trace amount of fruit disinfectant to prevent the fruit moisture from evaporating and restrain the respiration to achieve the preservation purpose. Pack the fruit in this box to keep the fruit fresh within a month.
Electronic preservation machine Made in France an electronic preservation machine. Put this machine in the fruit and vegetable storage room, so that the fruits and vegetables stored inside can be fresh and picked up as early as 75 days. This kind of preservation machine uses the negative oxygen ions and ozone produced by high-voltage negative-electrostatic sites to achieve the purpose of keeping fresh; ozone is a strong oxidant, and it is also a good disinfectant and fungicide that can kill and eliminate fruits and vegetables. Microorganisms and their toxic substances inhibit and delay the decomposition of organic matter, thereby prolonging the shelf life of fruits and vegetables.
High-temperature treatment preservation method Britain has invented a high-temperature storage technology for bulb vegetables. This technology uses high temperature to inhibit the germination of bulbous vegetables. The storage room temperature is controlled at 23 °C, and the relative humidity is maintained at 75%. In this way, long-term storage and preservation can be achieved. It is said that onions can be stored for 8 months under such conditions.
Decompression and Preservation Method Japan has developed a technology for storing fresh vegetables under reduced pressure. This preservation method is mainly used to reduce air pressure, cooperate with low temperature and high temperature, and use low-pressure air to circulate and other measures to create a favorable storage environment for fruits and vegetables. The low pressure in the storage room is generated by vacuum pumping indoor air. The low pressure is controlled below 100mm Hg and the lowest is 8mm Hg. The relative humidity in the air is controlled by a humidifier installed in the room, which is generally more than 90%. This method reduces the amount of oxygen in the room during the evacuation process, keeps the respiration of fruits and vegetables at the lowest level, and also eliminates some of the indoor gases such as carbon dioxide and ethylene, which is beneficial to the long-term storage of fruits and vegetables.
Air transport of fresh fruits and vegetables In order to keep fruits and vegetables fresh during the airlift process, a U.S. company invented a new method of reducing oxygen and increasing nitrogen content in packaging boxes to keep fruits and vegetables fresh. This method uses a new type of air conditioning box with air-conditioning performance. This package has a special film, which can absorb oxygen molecules and allow nitrogen to pass through. After entering the package through the film in the air, the content of nitrogen in the box can be as high as 98% or more, so that the respiration of fruits and vegetables can be slowed down and the purpose of keeping freshness for a longer period of time can be achieved.
New type of fruit and vegetable storage bags A company in the United States has introduced a new type of fruit and vegetable fresh plastic bags, which can extend the shelf life of fruits and vegetables and reduce the loss of fruits and vegetables caused by excessive aging. This kind of packaging bag is made of natural activated clay and polyethylene. It is like a very fine filter screen. Gases and moisture produced during the ripening process of fruits and vegetables can pass through the packaging bag. Fungus is not easy to grow in the bag, so fruits and vegetables can be made. The freshness of the freshness is more than 1 times longer.
New packaging for live shrimp delivery A food company in Hakodate City, Hokkaido, Japan, has developed a special package for the delivery of live shrimp in order to solve the problem that it is difficult for citizens to eat live shrimp. The package uses polyethylene as the inner layer, foam styrene as the outer layer, and crushed ice between the double layers. Internal hemorrhoids should prevent leakage and the outer layer should prevent damage. In the polyethylene tank where the live shrimp is moved, the sterilized seawater is filled with a certain amount of oxygen, and then it is sealed with a lid and transported. With this method, even if the outside temperature is as high as 40°C, the bottom-up rate of live shrimp can be kept above 90% within 24 hours. When the outside temperature is low, the ecology of live shrimp will be higher.
Vacuum product packaging for aquatic products using vacuum cleaners A company in Japan developed a simple packager for degassing aquatic products using the suction of a vacuum cleaner. Allegedly, simply connect the household vacuum cleaner and place the upper part of the plastic bag containing the aquatic product in the packer to remove the air. Complete the package. With this wrapper, different sizes of aquatic products can be vacuum-packed for small-scale aquatic product processing departments.
Water-soluble pesticide packaging film Paragon, UK produced a new type of polyethylene film that can be dissolved in water. It has been used as a package for accurately quantifying pesticides before they are used in water. The packaging film is mold-free, anti-static, heat-sealable, and can be colored and printed. It is a one-time use item, which can effectively ensure that the gas in the package is not leaked out and can resist the corrosion of various chemical pesticides. (Li Xiaorong)
Excerpt from China Packaging News 2000/3/30
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