Paper is a general name for materials made from cellulose fibers and is an old and traditional packaging material. Since China invented papermaking in 105 AD, paper has not only brought about the spread of culture. It also promotes the development of science and technology. In the modern industrial system, paper and paper containers occupy a very important position. In some developed countries, paper packaging materials account for 40 % to 50 % of the total packaging materials, and China accounts for about 40 %. From the perspective of development trends, the use of paper packaging materials will increase. * The reason why paper packaging materials are unique in the packaging industry is because they have the following unique advantages:
(1) Wide range of sources of raw materials, low cost, variety, and easy mass production;
(2) Good processing performance, easy composite processing, and excellent printing performance;
(3) Has a certain mechanical energy, lighter weight, and good cushioning;
(4) Good health and safety;
(5) Waste can be recycled without white pollution.
As a modern packaging material, paper is mainly used for the production of packaging products such as cartons, cartons, paper bags, paper containers, etc., in which corrugated cardboard and its cartons occupy the leading position of paper packaging materials and products; composite paper composed of a variety of materials Paperboard and specialty papers have been widely used and will partially replace the use of plastic packaging materials in food packaging to solve the environmental problems caused by plastic packaging.
As a paper packaging material for food packaging, its performance is mainly reflected in the following aspects.
( I ) Mechanical properties
Paper and cardboard have a certain strength, stiffness and mechanical adaptability, and its strength is mainly determined by the paper's material, quality, thickness, processing technology, surface conditions and a certain temperature and humidity conditions; in addition, the paper also has a certain degree of folding Sex, elasticity and tearability, etc., suitable for forming packaging containers or for wrapping.
Ambient temperature and humidity have a great influence on the strength of paper and paperboard. Changes in air temperature and humidity can cause changes in the equilibrium moisture of paper and paperboard, and eventually change its mechanical properties to different degrees. The mechanical properties of paper change with relative humidity. Because the paper fibers have greater water absorption, when the humidity increases, the paper's tensile strength and tear strength will decrease, affecting the use of paper and paperboard. A relative temperature and humidity condition must be maintained when measuring the mechanical properties of paper and board.
( B ) Barrier properties
Paper and paperboard are porous fiber materials that have a certain degree of permeability to moisture, gas, light, and grease, and their barrier properties are greatly affected by temperature and humidity. A single paper packaging material cannot generally be used to package foods that have high moisture content, high oil content, and high barrier properties, but can meet its barrier performance requirements through proper surface processing.
( three ) printing performance
Paper and paperboard have a strong ability to absorb and bind ink and have good printing performance. Therefore, they are often used as printing surfaces on packaging. The printing properties of paper and paperboard are mainly determined by the surface smoothness, sizing, elasticity, and adhesion.
( 4 ) Processing performance
Paper and paperboard have good processing performance, can be folded, and can use a variety of sealing methods, easy to process into a variety of packaging containers, easy to implement mechanized processing operations, has a mature production process. Good processability for the design of various functional structures (e.g., windowing, handle, and partition design Showcase) manufactured condition. In addition, through appropriate surface treatment, paper and paperboard can be provided with necessary moisture resistance, insect resistance, barrier properties, heat sealability, strength and physical properties, etc., to expand its scope of use.
( v ) Health and safety performance
In the processing of paper, chemical pulping, in particular, usually leaves certain chemical substances ( such as lye and salts remaining in the kraft pulping process ) , so it is necessary to correctly and reasonably select various ingredients according to the contents of the packaging. Paper and cardboard.
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Liyang Paper Products Co., ltd is a factory and trade company located in Dongguan, China. Specialized in producing gift paper packaging, such as gift box,paper box, paper bag, Jewelry box，watch box, belt box, shoe box, wine box,cosmetic box, flower box, round box,ect.
Custom made base on your design is welcome, feel free to contact Liyang printing with your full details.
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