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Before defining the level of waterproof cardboard, it is first necessary to analyze the environmental factors associated with water (steam) that corrugated board may be exposed to. From the point of view of the amount of water (steam) in the environment, corrugated board is most likely to be exposed to a humid environment, followed by a watery or rainy environment, and finally a harsh environment completely immersed in water. Therefore, the grade of waterproof cardboard can be defined according to the strength of the water vapor resistance (moisture), rain resistance, water immersion resistance, etc. of corrugated cardboard, and is generally classified into three grades of moisture resistance, water resistance and water resistance. 1. moisture-proof cardboard
Moisture-proof cardboard mainly refers to corrugated cardboard which can prevent or reduce the absorption of water vapor and moisture. It can avoid the moisture content of corrugated board rising too fast in high humidity environment and slow down the quality and performance of corrugated box. Moisture-proof cardboard can be made of high-performance moisture-proof base paper.
Moisture-proof cardboard is widely used in the outer packaging of industrial products such as electronic appliances and precision instruments. Since the electronic components inside such products are easily short-circuited or failed due to moisture infiltration, the outer packaging of such products needs to be adopted. Moisture-proof corrugated boxes to block moisture from the outside, and then add desiccant inside the carton to ensure the inside of the box is dry.
2. Waterproof cardboard
Water-resistant cardboard mainly refers to corrugated cardboard that can prevent water particles or water droplets from staying and permeating on the surface of the carton, which can prevent the quality and performance of the corrugated cardboard from falling directly after contact with water in a rainy environment. Such paperboard can be coated with water repellent, oily paint or varnish on the surface of the corrugated board, and then the process of surface coating is used to achieve the water resistance of the board. Dial agent and water can be done in a coating applied corrugating medium papermaking process, may be achieved by applying full version printing machine.
Water-resistant cardboard is suitable for outer packaging of fruits and vegetables and frozen foods. Because these products need to be transported at a certain temperature, it is easy to cause condensation of water condensation due to temperature changes during transportation, and the condensed water drops easily stay on the surface of the carton. Therefore, it is necessary to resist the water treatment of the cardboard.
3. Water resistant cardboard
Water-resistant cardboard mainly refers to corrugated cardboard which has no physical opening or peeling phenomenon and has certain physical properties. It can avoid the leakage of contents due to the corrugated Cardboard Box being no longer sealed after water immersion. Such paperboard can achieve the water resistance of the paperboard by using high-performance moisture-proof raw materials, modified water-repellent starch glue, and wax-impregnating process. The sizing process of starch glue is also completed in the corrugated paper preparation process. The starch glue used for modification needs to be uniformly added to the starch paste directly on demand. Of course, the process of dipping wax can be achieved by secondary processing to achieve water resistance of the paperboard. performance.
Water-resistant cardboard is suitable for products that require liquid transportation such as aquatic products, as well as some chemical powder products. Because liquid transported products have high water resistance requirements for paperboard, they must ensure that the products are in contact with liquids throughout the transportation process. The requirements for chemical packaging of plastic powder products are more to prevent chemical products from being encountered. Water reacts chemically and can cause harm to humans and the environment once a leak occurs.
When the above three types of paperboard are graded, they also consider the superposition of their various grades, that is, the high-grade waterproof cardboard should have the waterproof performance of the low-grade waterproof cardboard.
The above content is selected from the 10th issue of “Printing Technology ·Packaging and Decoration †by Keyin Media in 2012. For more journal content, please pay attention to the journal channel. The latest journal content clicks into the electronic journal channel of Keyin.com.
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