The packaging materials not only attract the attention of consumers with exquisite design, but also the performance quality is related to the practical problems of keeping fresh, preventing deterioration and convenient transportation and storage during food storage, transportation, processing and sales. How can it be effective and effective? It is necessary to solve these problems economically and conveniently, and to control and control the packaging materials. The quality control of food packaging has been developed in foreign countries for decades. Although China started late, it has developed very rapidly and has attracted more and more attention from food manufacturers, packaging suppliers and consumers. At present, food packaging inspection control is mainly reflected in the following two aspects:
1 , strength test. Strength is a comprehensive index, which is tensile packaging material, breaking strength and deformation rate, refinement seal heat seal strength, the strength of the comprehensive embodiment of the composite film, the physical index is specified in the relevant standards of strength requirements index. Common instruments used for this kind of testing include thickness gauges for accurate thickness measurement of films, papers, etc., seal testers for testing the sealing effect of whole packages, and tensile, peeling and tearing of test films, composite films, rubber and other materials. Electro-tension testing machine for cracking, heat-sealing strength, etc., tearing tester for tear resistance test of film, paper, etc., heat sealer for determining heat sealing temperature, heat sealing time, heat sealing pressure, etc. A friction tester for measuring the sliding dynamic and static friction coefficient of a film, a sheet, or the like, a torque meter for rotating the cap opening or tightening force test, and a test instrument such as impact, viscosity, and pressure resistance.
2 , barrier test. Barrier generally refers to the barrier effect of packaging materials on permeates such as gases and liquids. Because barrier performance directly affects key issues such as food quality and shelf life, it is important in many packaging test projects. Taking our common food packaging as an example, the oxygen permeation of dairy packaging is critical to the shelf life of milk. A large number of test results show that for fresh milk packaging, the oxygen permeability of the packaging is between 200-300 , refrigerated. The shelf life is about 10 days, the oxygen permeability is between 100-150 , up to 20 days. If the oxygen permeability is controlled below 5 , the shelf life can reach more than 1 month. For cooked meat products, not only need to pay attention to The oxygen permeability of the material prevents the oxidative deterioration of the meat product, and also pays attention to the moisture-proof property of the material, preventing the product from being largely lost in moisture and making the color darker and darker. For fried foods such as instant noodles, puffed foods, etc., the barrier properties of packaging materials can not be ignored. The packaging of such foods is mainly to prevent oxidation and rancidity of the products, so it is necessary to seal, isolate air, protect from light, and block gases. The packaging is mainly vacuum aluminum plating film. Through testing, the oxygen permeability of such packaging materials should generally be below 3 , and the moisture permeability is below 2 ; PET plastic bottles widely used in beverage and beer packaging are also extremely resistant to barrier properties. Strict requirements; there are also more common atmosphere packaging on the market, not only to control the oxygen transmission of the material, but also have certain requirements for the permeability of carbon dioxide. In summary, the importance of packaging barrier testing in packaging quality control is becoming increasingly prominent, and the barrier testing is consistent with the current global soft packaging industry's pursuit of high barrier performance, and its design represents the frontier of packaging inspection. Technology, the current testing equipment for barrier testing mainly includes gas permeability tester, moisture permeability tester, oxygen permeability meter, gas permeation meter, container / film oxygen permeability meter, and the like.
The new products and new materials of flexible packaging emerge in an endless stream, which makes the material property evaluation more important. The continuous improvement of packaging inspection and control technology and equipment has provided a powerful help for controlling quality, guiding processing and researching the properties of materials. At the same time, packaging quality control The digitization makes the packaging material manufacturers have rules to follow, the packaging materials users have evidence, and the quality control of food packaging is no longer an empty talk .
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