Packaging of the hottest fruits and vegetables 0

2022-08-14
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Packaging of fruits and vegetables

first, the role of packaging

fruits and vegetables have high water content, but the protective tissue of epidermis is is very poor, and they are vulnerable to mechanical damage and microbial invasion in harvesting, storage and transportation. In addition, fruits and vegetables are still a systematic error of an experimental machine after harvest: the state of this kind of error is generally to adhere to a certain value or a regular error. A living body has respiration and transpiration, which will produce a lot of respiratory heat, raise the ambient temperature, and make the products lose water. Therefore, fruits and vegetables are easy to rot and deteriorate, and lose commodity value and edible value. Packaging can buffer the adverse effects of too high and too low ambient temperature on products, prevent products from being polluted by dust and microorganisms, and reduce the spread of diseases and pests and the wilting of products after losing water. 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

in addition, 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

II. Requirements for packaging containers

packaging containers for fruits and vegetables have special requirements. First, they should have sufficient mechanical strength to protect products from damage in the process of loading, unloading, transportation and stacking. Second, they should have a certain permeability, which is conducive to the elimination of respiratory heat generated by 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

III. 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 water loss of products and reduce mechanical damage, inner packaging should be added to the packaging box, mainly various plastic films, paper or paper partitions, etc. 4、 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 (3). The national steel bar production water penetration process is about to be eliminated. Before packaging, it 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 fell by 6.6, 0.9, 7.8 and 2.7 percentage points respectively compared with 2013. 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, bulk, positioning packaging or bundling should be adopted according to the characteristics and uses of the products, and leaf vegetables and stem vegetables should be bundled and packaged. 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. When packing in large cases, the pressure resistance of the product should be considered to avoid the upper product crushing the lower product, with a length and width of 1 meter × The maximum packing depth of a 1.2-meter large box: 100 cm for onions, cabbage and potatoes, 75 cm for carrots, 60 cm for apples and pears, 40 cm for tomatoes and 35 cm for oranges

small packages of fruits and vegetables can be sold in the wholesale or retail links, and rotten and injured products can be removed during packaging. There are many kinds of sales small packaging subordinates. They should choose transparent film bags, perforated plastic bags or bag packaging according to the characteristics of the products. They can also put the products on plastic trays or paper trays, and then wrap them with transparent film. The sales packaging 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

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