Flexible packaging technology and application of t

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Food flexible packaging technology and its application (I)

flexible packaging has the characteristics of light, partition and surrounding, gradually reducing the scope of fault search, convenience, strength and beauty. The so-called light, that is, the weight of the packaging itself is light; Convenience, i.e. easy to use; Strong, that is, it is not easy to break and can withstand extrusion; Beauty refers to the variety of styles and the beauty of printing patterns, which can increase the aesthetic feeling of commodities

I. the market share of food flexible packaging is gradually increasing

with the continuous improvement of materials and processing technology, flexible packaging plays an increasingly important role in China's food industry. By 2002, the sales of flexible packaging had accounted for 56% of the sales of food packaging in China

in terms of perishable food packaging, the flexible packaging of meat food, agricultural products and other frozen food is the fastest growing. These perishable foods are usually packed with large capacity vacuum films. The main raw materials used in bagged meat food include clean and anti fog packaging materials, high barrier films and widely used shrink films. In 2002, in the field of fresh meat packaging, more than 30% used bag packaging

with the best-selling of smoked sausage for banquet and breakfast, the demand for packaging film will increase by 9% every year, becoming the fastest growing part. Metallocene is becoming a new favorite of sealing materials. Although the number of people who eat high-fat food and breakfast is decreasing, new tastes and low-fat food still help to promote the demand for packaging film

some other important food flexible packaging markets include Gu Renzhe Renren's research on food copper alloy materials, pet food and coffee. The fastest-growing flexible food packaging is the small packaging used for food with a price of about $5. Most of these foods will be prominently placed in the passageway, cashier's office or convenience store to place special food, so as to stimulate consumers' desire to buy

it is very necessary to print novel patterns on the packaging, which can often arouse people's desire to buy, such as candy. Many foods also require good moisture resistance

candy is the field with the highest profit margin and will continue to grow at a rate of about 5%. As the amount of candy purchased by consumers on impulse exceeds 70% of the total sales of candy, novel packaging and high-quality printed patterns, especially metallized patterns, are more and more widely used in candy packaging. The growing new market of low-fat candy also helps to promote the development of flexible packaging industry

more expensive packaging materials have been gradually adopted for high-end pet food, and its share in the flexible packaging market is also growing. Because these foods contain more expensive and oxygen sensitive ingredients, they need better packaging to protect them

II. Introduction to food flexible packaging materials

the primary function of new flexible packaging materials is to ensure the quality of food. Therefore, it is very important to block water vapor and oxygen, no bubbles in winter, not easy to break, high temperature resistance (sterilization), agitation resistance in use, suitable for microwave heating, economical and practical, and conducive to sales

1. High barrier film - notran film

notran film is indispensable for testing. It is a multi-layer structure film extruded by nylon or EVOH (high barrier) with strong gas barrier and polyolefin resin with strong heat sealing and water barrier. Notran film can block oxygen, flavor, solvent, etc. it is mainly used to improve the storage of contents. It is mainly used to package meat processing products (such as ham, sausage, clam slices), fresh meat, cheese, salad dressing, sauce foods, pickles, agricultural products and seafood

the main functions of the gas barrier film are:

(1) to prevent oxygen and other gases from entering the package and avoid causing microbial reproduction in the package

(2) prevent oxidation of package contents caused by oxygen permeation

(3) prevent fragrance and solvent from escaping

(4) replace packaging and vacuum packaging with gas (nitrogen, carbon dioxide, oxygen) to prevent gas leakage in the packaging or external gas entering the packaging

2. Evaporated PET film

silicon oxide evaporated PET film has a safe barrier property, but in the process of processing, use or circulation, once it is affected by external forces such as tension, thermal vibration and bending, the evaporated coating will be damaged and the barrier capacity will be greatly reduced. At present, researchers are researching and developing evaporation coatings with stable performance to try to change this situation

(to be continued)

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