Fruits and vegetables are stored during the maintenance of life through the respiration. During the breathing process, fruits and vegetables absorb oxygen, exhale carbon dioxide, produce ethylene gas, and reduce moisture. Respiration results in the depletion of internal components, flesh softening, and reduced nutritional value; ethylene gas can promote the aging of vegetables and fruits, and accelerate the respiration; the moisture content of fruits and vegetables is as high as 85%-95%, if the loss of water reaches 5%, The appearance will be wilting and reduce the value of the commodity; if it turns yellow, the content of vitamin C will be reduced, which shows that the respiration is the main factor affecting the freshness of vegetables and fruits. In addition, the corrosive effect of pathogenic microorganisms is another factor that causes a decrease in the freshness of vegetables.
The so-called food preservation technology is to maintain the freshness of foods and suppress the deterioration of foods. The preservation of fruits and vegetables is mainly to inhibit their respiration and proliferation of bacteria. The respiration of fruits and vegetables and the increment of microorganisms are related to the storage temperature, humidity and gas composition. In general, low temperature, high humidity, low oxygen, high carbon dioxide, low ethylene, sterile environment is conducive to the preservation of fresh fruits and vegetables, so the main method of preservation is to maintain low temperature, control the evaporation of water, adjust the gas environment, remove ethylene gas, Sterilization and antibacterial etc. The main materials for keeping fruits and vegetables fresh are functional plastic wrap, new corrugated boxes, and functional preservatives.
Although the traditional film of functional cling film can play the role of packaging and has certain preservation effect, it has obviously failed to meet the preservation requirements of the modern market. Therefore, a large number of new cling film has been developed. These functional cling films not only have the effect of preventing moisture from evaporating in the conventional film, but also have a simple effect of controlling the gas, and further increase the freshness of fruits and vegetables.
Ethylene adsorption film. Ethylene adsorption film is used to remove harmful ethylene gas. Plastic film (especially LDPE) is mixed with gas-absorbing porous material, such as talc and zeolite, quartz stone and silica, clay mineral, stone powder and other micro powders, most of which can be adsorbed. Ethylene or block far-infrared radiation. The mechanism of ethylene adsorption is that the pores on the surface of the porous inorganic material can capture ethylene, and even in the case of high moisture, the water molecules present in the pore can be replaced with ethylene. However, the addition amount of gas adsorbent is 3%-5%, because the adsorption capacity of ethylene gas is limited. At present, in the foreign countries, the use of titanite-based films is mainly due to the addition of silicic anhydride-based ceramics.
Anti-dew film. The plastic wrap used for fruits and vegetables is generally a film made of low-density polyethylene, polypropylene, polystyrene, ethylene-vinyl acetate copolymer, and polyvinyl chloride. When the water vapor generated from the vegetables and fruits is condensed on the inner surface of the film, not only the transparency thereof is poor, but also the water droplets gather, so that the bacteria multiply rapidly and the fruits and vegetables are corrupted. The solution to this problem is the prevention of dew film. The anti-corrosion film uses an interfacial agent to treat the inner surfaces of the above-mentioned materials, such as polyethylene, polypropylene, and polystyrene, to absorb excess moisture, and to appropriately maintain the humidity inside the package. The purpose of preservation. It can be used as a food additive, but it can also be used as a demulsifier.
Antibacterial film. In the antibacterial film, antibacterial silver zeolite is mixed into the film, and silver zeolite is a mixture of silver ions having an antibacterial effect and sodium ions in the crystal structure of zeolite, or a mixture of silver ions and synthetic loose zeolite using aluminum and silicon as raw materials. The main use of PE, PP and PS as a substrate. This film can inhibit the proliferation of bacteria to some extent, play a role in preservation.
Fresh-keeping corrugated cartons Corrugated cartons are currently used as containers for transportation of goods between consumption and production. They have attracted great attention in the preservation of fresh fruits and vegetables. (To be continued)
Dining chair is a common seat in restaurants, bars, cafes and other places for people to use when dining. According to different design styles, materials, functions and uses, dining chairs can be divided into a variety of categories. The following will be a brief introduction to the product classification of dining chairs.
First, according to the design style classification
1. Simple modern style: Simple modern style dining chairs usually use simple lines and Outlines, focusing on functionality and practicality, suitable for modern restaurants and cafes.
2. European classical style: European classical style dining chairs pay attention to gorgeous details and decoration, common hollow carving design and curve shape, suitable for high-end restaurants and banquet places.
3. Nordic style: Nordic style dining chairs focus on simple, natural and comfortable design, usually using wood materials and simple lines, suitable for family restaurants and cafes.
4. Industrial style: Industrial style dining chairs often use metal materials, with simple, solid and practical characteristics, simple and unadorned, suitable for cafes and bars and other places.
Second, according to the material classification
1. Wooden dining chair: Wooden dining chair is usually made of solid wood or artificial wood, with natural, environmental protection and warm characteristics, suitable for families and cafes and other places.
2. Metal dining chair: Metal dining chair is often made of metal materials such as iron, aluminum or stainless steel, with strong, durable and easy to clean characteristics, suitable for bars and cafes and other places.
3. Plastic dining chair: Plastic dining chair is usually made of polypropylene or polycarbonate and other plastic materials, with light, waterproof and easy to clean characteristics, suitable for fast food restaurants and school cafeterias and other places.
Third, according to the use of classification
Generally, it can be divided into two uses: domestic and commercial.
1. Home dining chair: Home dining chair pays attention to comfort and beauty, common dining table chair, folding chair and bar chair.
2. Commercial dining chairs: Commercial dining chairs pay attention to durability and practicality, common bar chairs, cafe chairs and fast food restaurant chairs.
In general: dining chair as one of the important furniture in restaurants, bars, cafes and other places, according to the design style, material and use of different, can be divided into a variety of categories. Choosing a dining chair that suits your place and needs can enhance the comfort and beauty of the dining environment.
Cafe chair,wholesale chair,stackable chair,connected chair
Foshan Shengshi Zhihui Technology Co., Ltd. , https://www.officeroutdoorfurniture.com