How should the hardness of the Corrugated Plastic Bin be improved?

1. Additives: This method is to add various chemical crystals to the fibers before and after papermaking to improve the cohesion of the fibers, thereby increasing the compressive strength of the corrugated box. These additives include, for example, corn, starch, gums, binders, and heavy metals, as well as plastics and urea (formaldehyde) resins. Fiberboard is also reinforced by chemically spraying the outer layers of the carton. Generally speaking, chemical additives are less expensive than cross-linking or other methods, but when they are more expensive to use than adding the weight of the base and core to make a stronger carton, then they do not make sense.

2. High pressure: The high-pressure cardboard forming method is also a method to enhance the strength of the cardboard during the papermaking process. The cardboard is tightly compressed by expanding the compression points on the paper fibers. The tighter the cardboard structure, the greater the strength. High-pressure board forming also helps squeeze more moisture out of the pulp, but the key is to make a tighter board that increases its compressive strength.

3. Lamination: This method of enhancing the strength of corrugated boxes is based on the lamination of two or more layers; core paper. The binder may be a simple cornstarch binder, producing a core paper of strength to sandwich cross-linked, pressure formed, or regular strength paper. The single-corrugated structure maintained by the double-core corrugated box plays the role of a corrugated box. It is about 10% heavier than a single-corrugated box, but its compressive strength is greatly increased by 10%. The double-core carton also has greater ring compressive strength, and at the same time increases the compressive strength of the carton, which plays an important role in stacking pallets with more than three heights.

4. Crosslinking: It is a processing method that changes the direction of fibers during the papermaking process. Usually, the paper fibers are oriented longitudinally parallel so that the fibers wrap around the box horizontally after the box is formed, which is a bad direction for the carton to resist pressure. Crosslinking causes many fibers to run 90 degrees in the machine direction. The result is that many fibers run vertically up and down the sides of the box, which increases the stacking strength of the carton without adding fibers.