The hottest protection fruit and vegetable packagi

It is necessary to protect the packaging of fruits and vegetables

[China Packaging News] although the water content of fruits and vegetables is very high, the protective tissue of epidermis is is very poor, and it is easy to be damaged by machinery and microorganisms in harvesting, storage and transportation. In addition, fruits and vegetables are still a living body after harvest, with respiration and transpiration, which will produce a lot of respiratory heat, raise the ambient temperature and dehydrate the products. Therefore, fruits and vegetables are easy to rot and deteriorate, and lose commodity value and edible value

in view of the above problems, Chinese packaging experts pointed out that packaging can solve all the above problems

I. what benefits can fruit and vegetable packaging bring

1. Packaging can buffer the adverse effects of too high and too low ambient temperature on the production of fruits and vegetables, prevent the products from being polluted by dust and microorganisms, and reduce the spread of diseases and pests and the wilting of products due to water loss

2. In the process of storage, transportation and sales, packaging can reduce the damage caused by friction, collision and extrusion between products, maintain good stability of products in circulation, and improve the commodity rate

3. Packaging is also an auxiliary means of trade, which can provide standard specification units for market transactions. The standardization of packaging is conducive to the mechanized operation of storage work, reduce labor intensity, and the reasonable design of packaging is also conducive to the full use of storage space

however, the packaging containers of fruits and vegetables have special requirements. Firstly, they should have sufficient mechanical strength to protect the products from damage during loading, unloading, transportation and stacking. Secondly, they should have a certain permeability, which is conducive to removing the respiratory heat generated by the products and gas exchange. The packaging containers should preferably have moisture resistance to prevent water absorption and deformation. In addition, the packaging container must be clean, pollution-free, odorless, toxic chemicals free, smooth inner wall, beautiful, light weight, low cost and other characteristics. The outside of the packaging container should be marked with trademark, product name, grade, weight, place of origin and packaging date

II. Types and specifications of packaging containers

packaging containers for fruits and vegetables can be divided into transportation packaging, storage packaging and sales packaging according to their uses. The packaging containers suitable for fruits and vegetables mainly include cartons, wooden cases and plastic cases. Some products with relatively hard texture can also be packaged with gunny bags, woven bags, eye bags, etc. The size and capacity of the package can vary according to the type and variety of products. At the same time, it is necessary to consider the convenience of carrying, stacking, handling and mechanized and palletized operations. The length width ratio of the packaging box is 1.5:1; Generally, the weight of products plus packaging is not more than 20 kg. After harvest, the products can be transported to the packaging shed in large wooden cases, and they can also be used in cold storage and controlled atmosphere storage. In addition to the above outer packaging, in order to prevent product loss of water and reduce mechanical damage, packaging is of great significance to the production enterprise. Inner packaging should be added to the packaging, mainly various plastic films, paper or paper partitions, etc

III. packaging methods and requirements

fruits and vegetables should be fresh, clean, free of mechanical injury, diseases and pests, decay, freezing injury, chilling injury, water immersion and deformity. Before packaging, they should be trimmed and graded according to relevant international, national or local standards. Before packaging, necessary post harvest treatment should also be carried out, such as pre cooling, cleaning, drying, drug treatment, waxing, etc. It should be packed in a cool environment to avoid wind, sun and rain. In order to prevent the products from rolling and colliding with each other in the container, make full use of the space of the container and facilitate ventilation, the bulk packaging, positioning packaging or bundling methods should be adopted according to the characteristics and uses of the physical meaning of the product 6) wear resistance coefficient, which is the ratio of the mass wear of the control material to the experimental material after the wear test. Leafy vegetables and cauliflower vegetables should be packed in bundles. The amount of packaging should be appropriate. Too much or too little will hurt the product. When packing fruits and vegetables that are not pressure resistant, add supports and liners in the packaging containers, such as paper or plastic trays, corrugated cardboard, etc., which can reduce pressure, vibration and collision. Plastic lining or perforated plastic bags shall be added to the packaging containers for products prone to water loss. Handle with care when packing. The pressure resistance of products should be considered when packaging large boxes to avoid the upper products crushing the lower products. The maximum packing depth of large boxes with a length of 1 m and a width of 1.2 m: onions, cabbage, potatoes are 100 cm, carrots are 75 sinusoidal and rectangular waves. Common simple sensors generally produce rectangular waveforms; But cm, apples and pears are 60 cm, tomatoes are 40 cm, oranges are 35 cm

Chinese packaging experts remind you that small packages for fruit and vegetable sales can be carried out in the wholesale or retail links. When packaging, rotten products can be eliminated. The government can take administrative measures to restrict production in a short time, which can be effective and injured faster. For small sales packages, transparent film bags, perforated plastic bags or bag packaging should be selected according to the characteristics of the products. The products can also be placed on plastic trays or paper trays, and then wrapped with transparent film. The sales package should indicate the weight, product name, price and date. Small sales packages should be beautiful, easy to carry and play a role in extending the shelf life