Food paper packaging has the characteristics of environmental protection, recycling and cost saving. With the increasing requirements of the whole international market for the environmental protection of packaging materials, paper packaging materials are the primary packaging materials. In addition to environmental protection, paper packaging materials have another feature, that is, they can quickly achieve the purpose of fast logistics and cost saving through commodity inspection. Now let's understand the advantages of paper packaging materials and the performance of packaging materials used for Qingdao food paper packaging.
Due to the above characteristics of paper packaging materials, the amount of paper packaging materials is increasing. In addition to the above characteristics, paper packaging materials also have the following unique advantages:
1. The raw materials are widely sourced, the cost is low, the variety is diverse, and it is easy to form mass production;
2. Good processing performance, easy to compound processing and excellent printing performance;
3. It has certain mechanical parts, light weight and good buffer;
4. Good health and safety;
5. The waste can be recycled without white pollution.
Performance of paper packaging materials:
Paper, as a modern packaging material, is mainly used to make cartons, cartons, paper bags, paper containers and other packaging products, among which corrugated cardboard and its cartons occupy the leading position of paper packaging materials and products; composite paper, cardboard and special processing paper composed of a variety of materials have been widely used, and some of them will replace plastic packaging materials in the application of food packaging, so as to solve the problem of plastic packaging. Environmental protection problems caused by packaging.
The performance of paper packaging materials for food packaging is mainly reflected in the following aspects.
I. printing performance
Paper and paperboard have strong ability of absorbing and binding ink and good printing performance, so they are often used as printing surface in packaging. The printing performance of paper and paperboard mainly depends on surface smoothness, rubber application, elasticity and adhesion.
II. Health and safety performance
In the process of paper processing, especially chemical pulping, there are always some chemical substances left. Therefore, it is necessary to select all kinds of paper and paperboard correctly and reasonably according to the contents of the package.
III. barrier performance
Paper and paperboard are porous fiber materials, which have certain degree of permeability to moisture, gas, light, grease and so on, and their barrier is greatly affected by temperature and humidity. Single paper packaging materials can not be used to package foods with high moisture content, grease content and high barrier requirements, but can meet the barrier performance requirements through proper surface processing.
IV. mechanical properties
Paper and paperboard have certain strength, stiffness and mechanical adaptability. Their strength mainly depends on the material, quality, thickness, processing technology, surface condition and certain temperature and humidity conditions of the paper. In addition, paper also has certain folding, elasticity and tearing properties, which are suitable for forming packaging containers or wrapping.
The environmental temperature and humidity have a great influence on the strength of paper and paperboard. The change of air temperature and humidity will cause the change of equilibrium moisture of paper and paperboard, and finally make their mechanical properties change in different degrees. The mechanical properties of paper vary with the relative humidity. Because the paper fiber has great water absorption, when the humidity increases, the tensile strength and tear strength of paper will decrease, which will affect the usability of paper and paperboard. A relative temperature and humidity condition must be maintained when measuring the mechanical properties of paper and paperboard.
V. processing performance
Paper and paperboard have good processing performance, foldable processing, and can be sealed in a variety of ways, easy to process into a variety of performance packaging containers, easy to achieve mechanized processing operations, there are mature production processes. Good processing performance makes it possible to design all kinds of functional structures (such as window, handle, wall and display platform). In addition, through proper surface treatment, paper and paperboard can be provided with necessary moisture-proof, insect proof, barrier, heat sealing, strength and physical properties, so as to expand its use.
Paper packaging has many advantages, but it also has the following disadvantages:
I. poor water resistance. Although the cartons can be covered with film, they can only deal with a small amount of water products.
2. Toughness: cartons are easy to be pierced by sharp articles, which are not suitable for sharp products.
3. Load bearing: cartons are limited in weight bearing, usually ranging from several kilograms to more than ten kilograms. It is recommended to use wooden cases and other packaging for heavy goods.