Summary of functional paper coating properties
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With the rapid development of the economy, customers are increasingly demanding the packaging of products. Under such conditions, functional coatings have promoted a technological innovation in corrugated carton coatings in the United States. Nowadays, China, which aims to develop rapidly in the economy, further promotes the use of new functional coatings and strives to promote the development of the packaging industry.
Paper coatings now shown generally have the following properties:
Waterproof paper coating
The traditional waterproof carton uses wax, and the paperboard after waxing will affect the color of the paper. The gray color is not so beautiful and affects the final packaging style. In addition, waxing must increase the weight of the carton and affect the degree of recycling. The series of water-based paints not only have a small amount of coating, but also do not affect the reprinting ability and cohesiveness of the carton, making our carton beautiful and sturdy. Some of the waterproof coating coated paper can be made into a water tank, which can raise goldfish for 7 days, and the cardboard box is still strong and does not seep.
Corrugated reinforced coating
This is a new application area for waterborne paper coatings. In foreign countries, most corrugated boxes are single-handed, and currently in China, most of them use multi-ply cardboard to increase the strength of the carton. With corrugated reinforced coatings, the US Fiber series uses a special polymer to act between the pulp fibers to enhance the strength of the carton. We can not only use low-weight paper, but also reduce the number of cardboard turns. The degree of reinforcement of corrugated reinforced coatings is related to the type of paper and fiber properties.
Moisture proof coating
Waterproof coatings prevent water from penetrating, but often do not prevent the passage of moisture. For the preservation of food, we not only require water separation, but also prevent the penetration of water vapor. At present, the domestic coating paper is generally used for packaging, and the moisture-proof coating using Vaporcoat not only simplifies the packaging paper production process, but also can recover 100%, reduce the packaging cost and be more environmentally friendly. Exquisite fresh tea packaging, using moisture-proof coating, so that the tea still breathes in the bag. That is, paper is like the skin of our body.
Grease resistant coating
When we bought a pizza outside and got it in our hands, the box of oil had penetrated and even the pizza had been found stuck to the box. When our carton is coated with grease-resistant paint, the pizza that the customer sees is completely different, fresh and complete, and very appetizing. Today, developed countries in Europe and the United States have long used grease-resistant coated paper for food packaging, such as meat, poultry and snacks, and chocolate packaging.
Abrasion resistant coating
Abrasion resistant paper coatings are designed to reduce the friction of the product during transport. In China, we generally use similar products such as foam, especially in the home appliance industry. However, in addition to environmental issues, key manufacturers must use a variety of materials at the same time. The wear-resistant coating of NomarTM series of the United States reduces the original hardness of the paper and forms a special coating structure on the surface of the paper to reduce the friction between the original paper and the surface of the appliance. Protect the surface of the appliance intact. Of course, wear-resistant coatings go far beyond these functions.
Special coating
The special coatings currently used are mainly the following: corrosion resistant coatings, fire retardant coatings, antistatic coatings, release coatings, etc.
Corrosion-resistant coatings, corrosion-resistant coatings are mainly used to protect steel, iron, copper and other metal parts. After being applied to the surface of the carton, the US Rustban series can effectively prevent the oxidation of the packaging metal, so that the packaged metal parts will not be rusted and tarnished. Many manufacturers can make the paper have anti-corrosion performance according to the customer's needs, and prevent oil leakage on the hardware parts.
Fire-retardant coatings, we all know that corrugated paper is a flammable product. In some cases, there are certain fire-proof requirements for packaging materials. At this time, we can use fire-retardant coatings. The fire-resistant coatings of American PyrobreakTM EX series can effectively prevent the fire-resistant coatings in some cases. The carton burns. If the paper's fire retardant coating passes the tests of ASTM E-162, ASTM E-84, TAPPI 461 and NFPA 30, it is considered to be a suitable coating for production use.
Anti-static coatings, in some electronic components packaging, generally have anti-static requirements, currently in the domestic packaging of these products mainly use anti-static plastic bags, and then used cardboard boxes or plastic boxes for packaging and transportation. In terms of operation, there are many processes and the cost of the package is relatively high. After the American Staticban series antistatic coating is applied on the corrugated box, the surface of the carton has the functions of conduction and electrolysis, which can effectively protect the electronic components from the dangers of static electricity and other electric charges. Packaging electronic components with cartons or cartons coated with antistatic coatings can reduce the number of steps in the packaging process and reduce the cost of packaging materials.
In addition to meeting the non-tackiness, the release coating can also satisfy the storage of products such as asphalt and rubber, that is, it also satisfies the heat resistance. The hot bitumen is poured into a paper bag coated with the McAfee door release paint, and after it is cooled, it is still not stuck to the paper bag.