Quality and safety control of the most popular ste

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Quality and safety control of sterile paper-based composite packaging

overview of sterile paper-based packaging

sterile packaging is a high-tech food preservation method, which refers to a packaging technology in which the packaged food is sterilized for a short time before packaging, and then filled and sealed in a sterile environment under the condition that the packaging, the packaging, and the packaging auxiliary equipment are sterile, so as to achieve that the food does not add preservatives and is not refrigerated, It can achieve the purpose of long shelf life (it can be maintained for one to one and a half years without deterioration at room temperature), which greatly saves energy and equipment

at present, aseptic packaged foods (especially small aseptic packages) occupy more and more market shares in the market. The reason why aseptic packaging is more and more popular with consumers is mainly determined by its characteristics. Aseptic packaging can adopt the most suitable sterilization methods (such as HTST method, UHT method, etc.) to sterilize the contents of the packaging, so that the color, flavor, texture and nutritional components can be placed on the lens to produce mildew or other states caused by dust and other food quality will be less lost. Because the packaging container and food are sterilized separately, products with stable quality can be obtained regardless of the container capacity, and even large-scale packaged food can be produced. Moreover, compared with post packaging sterilization, it is not easy for the components of packaging materials to dissolve into food between food and containers, which is conducive to the creation of benefits and original flavor of food. Because the sterilization technology on the surface of the container is easy, and has nothing to do with the sterilization of the contents, the heat resistance requirements of the packaging materials are not high, and the strength requirements are not so strict, which makes sterilization easier to achieve. It is suitable for automatic continuous production, which saves labor and energy

normal temperature beverage boxes are usually brick shaped. Because most of these beverage boxes are produced and provided by Tetra Pak, people are used to calling them "Tetra Pak". The main material of Tetra Pak is cardboard, which is made of native long fibers. Some of these fibers have been bleached, and some have not been bleached. In order to increase the thickness and stiffness, some chemical thermal refining (CTMP) is usually added to the paperboard. In order to make the surface of the paperboard smooth and easy to print, there is a thin coating on the outside of the paperboard. Tetra Pak is composed of six layers of materials such as cardboard, polyethylene plastic and aluminum foil, of which paper accounts for 73%, plastic for 25%, aluminum for 5%, printing ink and coating for 2%. All of the paperboard comes from the sustainable renewable forests in Europe and the United States. According to the data provided in the announcement, the resources are calculated. Its main suppliers are international paper, Stora Enso, vishwick and other multinational paper companies

structure and advantages of sterile paper-based composite packaging

the material of sterile paper-based packaging is aluminum foil/paper/plastic composite material. The products of Tetra Pak in Sweden, pkl in Germany and sig kangmeibao are mainly on the market. Among them, paperboard is a structural material, and its composition ratio and performance of pulp are proprietary technology, which is matched with its unique packaging machine. Aluminum foil is a barrier material, with a general thickness of 6 μ, And there must be no pores and damage. Polyethylene is the inner material in contact with food, and it is heat sealing material. Sarin resin can prevent high acid drinks from etching aluminum foil

1. Sterile bricks. Aseptic brick is made of paper, aluminum and plastic composite laminates, with a thickness of about 0.35mm. The typical structure is Tetra Pak: PE/paperboard/adhesive layer/Al/PE/PE; Kangmei bag: PE/white cardboard/Al/adhesive layer/PE. The inner layer plays the role of heat sealing and containing food. The aluminum foil provides the best oxygen, water and light resistance. The bonding layer connects the aluminum foil with the paperboard. The paperboard provides rigidity and printability. The outer PE protects the ink and paperboard

2. Sterile pillow. The sterile pillow is also a multi-layer paper, aluminum and plastic composite material. According to the experimental request, the operating parameters of the experiment are close to those of the brick bag, but the paperboard material is different. Its structure is PE/paper/adhesive layer/Al/adhesive layer/PE. The paper is a printing layer, which can be flexographic printing or offset printing, and has good barrier and light resistance

3. Advantages of sterile packaging

(1) the main advantage of aseptic packaging is that it can retain the original nutritional components and flavor of food to the greatest extent and reduce losses under the condition of ensuring sterility

(2) the packaging cost of sterile packaging is relatively low, and it is convenient for storage and transportation (the weight of packaging only accounts for 5% - 10% of the weight of food)

(3) beautiful appearance, easy to be welcomed by merchants and consumers

(4) increase consumers' sensory enjoyment, increase beauty, and stimulate consumers' desire to buy

(5) the price is reasonable, so that consumers spend money on food rather than packaging

quality evaluation of sterile packaging equipment and packaging materials

1 At present, there is no unified standard in the world, but the generally recognized evaluation standards are:

(1) appearance quality

(2) safety performance

(3) continuous working stability

(4) standardization and interchangeability of parts

(5) bactericidal ability

(6) after sales service

(7) impact on the environment

2. About sterilization ability

(1) German jrenhil company put forward the following suggestions - definition of health grade: the cost of technical measures taken to avoid re pollution caused by various secondary pollution sources determines the definition of four health grades

a. "ordinary level": with basic technical equipment

b. "sanitary grade": with additional sanitary equipment, sterile air is introduced into the filling area

c. "super grade": exclude plant-based bacteria, and the test strain is Niger mold (used for sterilization of products with pH < 4.5 or aw < 0.95).

d. "sterile grade": exclude any microorganisms, including bacterial spores, and the test strain is Bacillus subtilis (also used for sterilization of products with pH < 4.5 or aw < 0.95)

the so-called exclusion means that the total proportion of sterilization failure is limited within the specified range. When formulating national standards, we formulated the following standards with reference to the above requirements: liquid food packaging equipment can be divided into --

(1) "ordinary packaging equipment": with basic technical equipment, it meets the hygienic standards of packaged liquid food, and is used for packaging condiments, carbonated drinks, low alcohol wines, etc., and transportation and storage at room temperature

(2) "fresh keeping packaging equipment": with additional sanitary equipment to limit secondary pollution, it is used for the packaging of refrigerated liquid food

(3) "hot filling equipment": filling at 83 ℃ ~ 95 ℃, killing microorganisms on the packaging and top cover, meeting the conditions of commercial sterility, and used for the packaging of tea drinks and low nutritional liquid foods. Transportation and storage under normal temperature

(4) "sterile packaging equipment": exclude any microorganisms, including bacterial spores, meet the conditions of commercial sterility, and transport and store at room temperature

quality control of sterile packaging equipment and packaging materials

1 In order to strengthen the quality control of aseptic packaging equipment and packaging materials, corresponding national standards have been formulated in recent years

gb18192-2000 paper based composites for sterile packaging of liquid food Gb18454-2001 compound bags for aseptic packaging of liquid food Gb-18706-2002 paper based composites (roof packs) for fresh-keeping packaging of liquid food GB/t19063 code for acceptance of liquid food packaging equipment code for acceptance of UHT equipment for composite films and bags for liquid food packaging

2. A few notes

(1) the national standard only stipulates the basic requirements for the quality of equipment or packaging materials. All enterprises should improve one step in order to increase market competitiveness and serve user enterprises

(2) aseptic packaging is a systematic engineering, in which the quality of equipment and packaging materials is an important link, but not all. The quality of users' final products also depends on the quality of raw materials, production conditions, production management and the cooperation between upstream and downstream manufacturers

control of the properties and characteristics of paper-based composite packaging materials

paper aluminum plastic composite film is composed of kraft paper, aluminum foil and PE. It has strong barrier properties against water vapor and gas, can prevent the deliquescence and deterioration of the contents, and can extend the shelf life of the contents. At the same time, it has good printability and beautiful appearance; Good mechanical adaptability and stiffness, suitable for high-speed packaging machines; Degradable, conducive to environmental protection

1. Air permeability. Different packages have different requirements on the permeability of materials. In the food industry, the most important barrier is oxygen permeability. High barrier materials are mainly used in milk, fresh-keeping film, special drugs and other packaging

the oxygen permeability of paper aluminum plastic composites is directly related to the properties of aluminum foil

is mainly determined by the thickness of aluminum foil, the number of pinholes and surface cleanliness. With the increase of the thickness of aluminum foil, its transmittance to oxygen, water vapor, light, etc. gradually decreases, and accordingly, its barrier performance is higher (the thickness of aluminum foil used in composite flexible packaging is usually 7 μ m~9 μ M); The number of pinholes of aluminum foil should be as small as possible, and the aperture should also be as small as possible; If the surface cleanliness of aluminum foil is poor and there is residual oil, the composite strength is relatively poor

2. Coefficient of friction. The test of friction coefficient of flexible plastic packaging materials can control and adjust the opening of packaging bags, the packaging speed of packaging machines and other production quality process indicators

as a new type of food and drug composite packaging material, the paper surface of paper aluminum plastic composite film can be used as the outer bag to achieve better appearance effect. And in the composite flexible packaging industry, the dynamic and static friction coefficient of the inner bag is generally required to be less than 0.3, and the friction coefficient of the cladding is controlled between 0.3 and 0.5. Therefore, we can now explain why the plastic surface is generally used as the inner bag

3. Heat sealing strength. Cover strength is an important performance index for packaging materials. Any kind of soft packaging materials should be made into packaging bags to package all kinds of goods, including goods, which should be sealed by heat sealing or bonding to achieve the purpose of packaging. The seal must have a certain strength to bear the pressure of a certain weight of the contents, so as to ensure that the goods will not crack in the process of circulation

formula of heat sealing strength: B = peak value of the force on the material f (n)/width of the sample B (CM)

in the application of materials, a single performance cannot be considered, and the optimization of various properties, production efficiency and application occasions must be considered to optimize its comprehensive performance

4. Solvent residue. The solvent residue of composite packaging generally comes from ink, solvent and production process. The commonly used solvents are toluene, butanone, ethyl acetate, etc

gb9683 "Hygienic standard for composite food packaging bags" controls trace harmful substances in adhesives, such as diaminotoluene, but does not require solvent residues; Gb9685 "Hygienic standard for the use of additives for food containers and packaging materials" stipulates the names and maximum usage of 58 specific substances in 17 categories, such as additives, solvents and adhesives; Gb10004 "cooking resistant composite film and bag" stipulates that the total amount of solvent residue is ≤ 10mg/m2; Gb10005 biaxially oriented polypropylene/low density polyethylene composite films and bags stipulates that the total amount of solvent residue is ≤ 10mg/m2. Benzene residue ≤ 3mg/m2

the United States and the European Union have clearly stipulated the types of adhesives and inks used in food or drug packaging in relevant laws, and stipulated the scope of restrictions on their use. In fact, for the sake of environmental protection, there are generally international regulations on commodity packaging

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