In order to enhance the preservation effect of vegetables, at the same time as using the above-mentioned packaging materials, substances with specific functions, such as fresh-keeping sheets, preservatives and cooling agents, may be added. In the single packaging of vegetables, plastic platters and film composite products are used, so the functional sheet placed on the platter body or on the top has a fresh-keeping function. These sheets often have one or more functions such as humidity control, dew proofing, ethylene gas absorption, and antibacterial. Among them, moisture-adsorption and water-absorption are multilayer structures composed of high water-absorbent resin and non-woven fabric, thin paper, and water-absorbing polymer; the absorption of ethylene gas mostly utilizes the porosity of activated carbon; the antibacterial property is due to the addition of silver to the sheet. Zeolites and other inorganic substances with antibacterial properties or antibacterial ingredients extracted from plants. Since the absorption of the functional film that absorbs ethylene gas is limited by the amount of use, preservatives for adsorbing ethylene gas are widely used. Packaging fruits and vegetables together with preservatives can achieve a certain purpose of inhibiting ethylene gas. Currently used preservatives often use oxidants such as potassium permanganate, gas adsorbents such as activated carbon and mineral powder, and palladium catalysts. Because the preservation of vegetables at low temperatures helps maintain their freshness, the use of cold storage materials has become an important means of preservation technology. The elastic gel-like material mainly composed of ultra-high molecular weight sodium polyacrylate or a graft polymer thereof is a high-performance cold storage material. After being frozen, it can release energy slowly. If it is used together with a heat insulation box, it can get a good cooling effect. Fresh-keeping trays are made from thermoplastic sheets by vacuum forming and stamping. In addition to preventing fresh food from being damaged, the use of a tray also has a certain degree of thermal insulation. The so-called new type of trays is to add functional film or long-fiber non-woven fabric to the thermoplastic sheet. Made of molded products. This kind of tray adds functions such as adjusting humidity, controlling gas content, and preventing mould from multiplying on the basis of original functions, so it can maintain the freshness of vegetables and fruits. In order to reduce the influence of pathogenic microorganisms on the freshness of vegetables during storage and transportation, vegetables may be sterilized by radiation after picking, and then packaged and transported. At present, the United States and South Africa and other countries adopt a certain amount of vegetables under a certain intensity of radiation treatment. Hongxing Factory Simplex Hard Hat,Simplex Cap,Customizable Hard Hat,Simplex Labor Protection Cap Dongying Hong Xing Labor Protection Products Co.,Ltd. , https://www.hongxinglabor.com
Dongying Hongxing is located at Dongying City, Shandong Province China since 1995.
We have 30 categories of products, including Covid-19 products, frock, protection shoes, safety belt, Special gloves.
Our main customer in China is Sinopec, Petro China, Energy company, steel company and Tabacco Company in other countires. Our factory have 500workers and 22 technical employees and invest thirty eight million dollars .
FAQ
1. What are your main products ?- Safety shoes
- Protective helmet
- Work clothes
- Safety cloves
- Protective equipment and masks
2. Can you offer OEM ?
Our company accep OEM service , if you need, please inform us of your specific requirements
3. What's your mode of transportation ?
By sea, By air, By train, By truck, as your request. We also do a good job to deliver goods to your destination.
4. What's your payment terms ?
T/T, L/C, Paypal..... If you need to pay via other ways, please negotiate with us.
5. Can you offer sample ?
Yes, we can offer samples to help you check type and quality.
6. Are you manufacturer or trader ?
We have own factory in Donying city, Shandong province, welcom to visit our factory !