Functional corrugated paperboard and corrugated cartons have a wide variety of methods and methods, and their effects are also different depending on the product being packaged and the storage environment. The key technologies of functional corrugated paperboard and corrugated carton are the modification of the traditional carton and corrugated board and the functional design and innovation of the traditional corrugated box structure.
Functional corrugated cardboard
In high-temperature environments, the moisture content of the packaged goods or the product itself is too high. The use of ordinary corrugated board will significantly reduce the compressive strength of the carton. When the moisture content is high, it is the flat compressive strength of the corrugated cardboard, and the side pressure strength is particularly reduced. According to the requirements of the use of different methods to improve the waterproof performance of corrugated board, the main products are hydrophobic corrugated cardboard and water-resistant corrugated cardboard.
Normal > Hydrophobic corrugated cardboard
Normal > also known as water repellent corrugated board, when it is exposed to water for a short time, the surface of the processed cardboard will make the water splash as water droplets to prevent water from penetrating into the interior of the paperboard.
Normal > Processing method: The processing method of general hydrophobic corrugated paperboard is coating processing. Commonly used coatings include waxes, silicones, and varnish. Varnish low viscosity permeability is good, but excessive penetration into the paper will reduce the hydrophobic effect, so brushing the best oil on the surface of the paperboard is best to brush a starch slurry, drying film and then painted Varnish, the effect is better . In addition, the addition of a suitable amount of water-resistant additives, such as urea-formaldehyde resin, melamine-formaldehyde resin, and polyvinyl butyral, can improve the water resistance of the coating. The waterproof coating can be applied directly to the surface of the corrugated cardboard during processing.
Normal> Paraffin wax is applied to both surfaces of corrugated board, and the corrugated core is spray-coated. This results in a corrugated cardboard with higher hydrophobic properties. Its patent name is M/R corrugated cardboard.
Normal > Hydrophobic corrugated cardboard is suitable for packaging dry powdered articles, especially powders that are easy to agglomerate after absorbing water, and is also suitable for packaging goods that often come in and out of cold storage. After being taken out of a cold storage, it is easy to form condensation on the wall of the box. Ordinary corrugated board will The rapid absorption reduces the compressive strength, resulting in the carton being unable to withstand the stacking pressure and crushing. After the hydrophobic processed cardboard does not significantly reduce the compressive strength before dew evaporation, it can effectively protect the goods.
Normal > Waterproof corrugated cardboard
Normal> Waterproof or water-repellent corrugated board, whose surface is in contact with water for a long time, is almost impervious to water, but it cannot be immersed in water, otherwise it will lose its waterproof performance. The result is similar to ordinary corrugated board, which is mainly related to its processing technology.
Normal > Ø processing method
Normal > Covering water-based corrugated board commonly used curtain coating method, which means that the molten synthetic resin or paraffin mixture flows from the hopper mouth into a film-like shape and is coated on the horizontally running corrugated board to form a layer of resin film or wax film on the board surface. Has good water retention properties. If necessary, cover the membrane once again on the other side to obtain double-sided waterproof performance.
