With the rapid development of flexible food packaging plastic materials, the traditional materials of food packaging materials are metal, glass, ceramics, paper, etc. Nowadays, the commonly used flexible packaging materials are polymer materials, which are also called polymer materials. The compound is the matrix, and it is equipped with materials composed of other additives (auxiliary agents). As a flexible food packaging material, polymer materials have the function of maintaining the quality and freshness of food. It is mainly embodied in: First, the barrier performance, which prevents the moisture, volatile aroma and oil contained in the food from penetrating to the outside, and prevents external moisture, heat, dust, gas, and microorganisms from penetrating the food in the package. The second is the protection performance, which reduces the damage caused by external forces such as vibration, impact, and extrusion during the transportation and storage of the food.
In 1970, my country issued GB 1037-1970 "Test Methods for Water Vapor Permeability of Plastics", which created the first method standard for the testing of plastic water vapor permeability. In 1988, the traditional and classic GB 1037-1988 "Water Vapor Permeability of Plastic Films and Sheets" was launched. The Cup Method of Sexuality Test Method, which is still in use today. The cup method, also called the weighing method, is the basic method of the moisture permeability test method. It is recognized as the benchmark of the moisture permeability test data system in both domestic and foreign standards. With the rapid development of the food flexible packaging industry, in order to better promote and standardize the production and development of the food flexible packaging industry, my country officially issued GB/T 21529-2008 "Plastic Film and Sheet Water Vapor Transmission Rate Determination Electrolytic Sensor Method in 2008 "After two years, my country issued GB/T 26253-2010 "Infrared Detector Method for the Determination of Water Vapor Transmission Rate of Plastic Films and Sheets". The emergence of electrolytic sensor method and infrared detector method greatly improved the detection The accuracy of the results broadens the selectivity and comparability of testing methods for the moisture permeability of flexible food packaging products.
The cup method, also called the weighing method, has a wide range and is a benchmark method for water vapor permeability. It has a great influence in the process of exploring the moisture permeability of the sample, and the accuracy is relatively low. It is recommended that the water vapor transmission rate is 2g/(24h) or more Use this method for flexible food packaging materials.
Electrolysis sensor method (electrolysis method) and infrared detector method (infrared method) are based on the cup method and use high-tech methods to measure. They are suitable for plastic films, plastic-containing multilayer composite films, sheets and other materials. The determination of vapor transmission rate has the characteristics of short test time, high accuracy, and good repeatability, which is suitable for the detection of high barrier materials.
Among them, the national pharmaceutical packaging material standard "YBB00092003-2015 Water Vapor Transmission Rate Determination Method" stipulates the water vapor transmission rate detection method of pharmaceutical packaging materials, and stipulates that the infrared method is the arbitration method. The promulgation of the series of standards for the determination of water vapor transmission rate of plastic films and sheets indicates that the domestic market entry barriers are basically synchronized with the world, which solves technical problems for market supervision and lays the foundation for the development of domestic water vapor transmission measurement instruments. .
As early as 2010, Guangzhou Standard International successfully developed air permeability, moisture permeability, and oxygen permeability testing instruments. In 2014, it was the first company in China to develop national standard materials for oxygen permeability, moisture permeability, and air permeability. In 2015, it passed the National CNAS laboratory. Certified and became the supplier of breathable, moisture-permeable, and oxygen-permeable standard materials for the plastic packaging industry in the Asia-Pacific region. As a pioneer in the packaging material testing industry, Guangzhou Biaoji serves inspection agencies, scientific research institutions, food and pharmaceuticals, daily chemical cigarette packs, packaging plants, new materials, new energy, film plants and other fields in dozens of countries and regions around the world. Of customers provide more stable and reliable testing equipment.
