For industrialized production and sales of foods, which are mainly in the recent decades of reform and opening up, during this period of time, food packaging has also taken various forms from paper packaging to bottle packaging. Nowadays, there are many kinds of food on the market, and there are many kinds of foods, but we have food products. There is still much room for improvement and improvement in packaging compared to food production lines.
Currently, foods on the market are mainly divided into liquid, solid, and powder forms. These three forms are all different for food bottle packaging. Solid food bottles such as biscuits, dried fruits are suitable for wide-mouthed forms, and liquids such as wine and beverages require unique and convenient designs. Different types of food bottle packaging materials will also be different.
Common materials for food bottle packaging:
plastic
Plastic is a high-molecular polymer - resin is the basic ingredient, and then added with a number of additives to improve its performance made of polymer materials, the molecular weight is usually 104-106 or more, its macromolecules have a special structure, so that It has a series of special properties, such as chemical inertness, insolubility, toughness and so on. The use of plastics as a packaging material is an important symbol for the development of modern packaging technology. Because of its rich source of raw materials, low cost, and excellent performance, it has become the world's fastest growing, high-volume packaging material in the past 40 years. Plastic packaging materials are widely used in food packaging, and gradually replaced traditional packaging materials such as glass, metal, and paper, resulting in a tremendous change in the appearance of food packaging, reflecting the rich and varied forms of modern food packaging, and the ease of circulation and use. Become the most important packaging material in food packaging sales packaging. The disadvantage is that there are some problems in the health and safety of certain types of foods, and the environmental pollution caused by the recycling of packaging waste.
Metal
Metallic materials are a long history of packaging materials used in food packaging for nearly 200 years. Metal packaging materials and containers are metal sheets or foils as raw materials, and then processed into various forms of containers to package foods. Because metal packaging materials have high barrier properties, excellent mechanical mechanical properties and molding processing performance, and have good resistance to high and low temperature performance, thermal conductivity and surface decorative properties, it has excellent packaging characteristics, packaging effects and production efficiency , And metal packaging material waste easier to recycle, less pollution to the environment, but also return to the furnace regeneration, saving resources and energy, which is advocating "green packaging" today is particularly important. Therefore, the application of food packaging has become more and more extensive, becoming one of the four most important modern packaging materials. However, due to the poor chemical stability of the metal packaging material, not to acid and alkali, especially when it is used to package high-acid foods, it is easy to be corroded, and metal ions are easily precipitated to affect the flavor of the food, which limits its use to some extent.
Glass
Glass is made of quartz, soda ash, limestone, stabilizer as the main raw material, adding clarifying agent, coloring agent, decoloring agent, etc., after temperature smelting and then condensed by a non-crystalline material. Glass is an ancient packaging material used in food packaging for more than 3,000 years. Due to the advantages of glass itself, the glass exhibits remarkable characteristics when it is used as a packaging material: high barrier, bright and transparent, good chemical stability, and easy molding. However, the glass container is heavy and easily broken. This performance defect affects the plant The use and development of packaging, especially the impact of plastic and composite packaging materials. With the development of production technology in the glass industry, (ten) high-strength, lightweight glass materials and their products have been developed. At present, China's glass consumption accounts for about 10% of the total packaging materials, and it is still an important material for food packaging towels. one.
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