How to increase the compressive strength of corrugated boxes

Due to high housing prices and limited land, plans to expand the warehouse have meant that every inch of existing warehouse space must be fully utilized. In this way, one solution is to pile higher.

It is a test that stacks up the compressive strength of the carton. When the bottom box collapses, the tray product is damaged and the bottle breaks. If the juice bottle is on the floor, the storehouse floor will be filled with sticky juice, broken glass bottles and soggy corrugated boxes.

This shows the increasingly important role of the corrugated board transport box in ensuring the safe delivery of products from the factory to the customer. According to the situation provided by relevant departments of corrugated boxes, most of all packaging products are shipped in corrugated boxes. The role of the shipping cartons in protecting the products from damage throughout the entire distribution process should not be underestimated. The food industry estimates that about one-fifth of the value of commercial damage is caused by packaging problems each year.

In today's economic conditions, the latest developments in high-performance corrugated board materials and containers have met the needs of packaging plants in all walks of life. Transport boxes are getting higher and higher in the warehouse. Fully loaded cartons are shipped from the northern plant to low humidity conditions; transported to high humidity southern distribution centers. The storage time is relatively long under such changing conditions, and the packaging box therefore receives a great deal of pressure from the weight and the surrounding environment. The key to providing a high-performance corrugated carton is to enhance the top-to-bottom compressive strength of a single-wall corrugated carton.

Prior to the advent of high-performance corrugated boxes, the only way to increase the compressive strength of cartons was to add fibers, either in the form of thicker backing and core paper, or in multilayer construction. However, these methods have increased the economic expenditure, not only making boxes more money, but also increasing the weight of boxes and occupying more places in transportation and storage. At the same time, there are fewer stocks in the same size space and increase the transport weight.

After the introduction of high-performance corrugated paperboard, carton suppliers experimented with various methods that could both create reinforced paperboards and reduce the number of layers required for box making. Each processing method gives a certain reinforcement to the carton.

Cross-linking is a process that changes the direction of the fibers during the papermaking process. Normally, the paper fibers are oriented parallel to the longitudinal direction, which causes the fiber level after the box is formed to surround the box, which is the worst direction of the compressive strength of the carton from top to bottom.

Cross-linking leads many fibers to run at 90 degrees to the machine direction. The processing result is that the multi-fibers run up and down perpendicularly to the edge of the box, thus increasing the fiber and increasing the stacking strength of the carton.

Measuring the strength of a backing paper when cross-linked is to measure its ability to withstand ring-pressure failure. A 6-inch-long cardboard strip is bent into a ring. The number of pounds used to compress and destroy it is the material's ring crush strength. The high ring crush strength liner and the high crush strength core paper not only increase the pressure resistance of the vertical edge of the carton, but also increase the The compressive strength of the entire carton.

High-pressure plate forming is another method of enhancing the strength of the paperboard during papermaking. Basically, the paperboard is tightly compressed using the enlarging paper fibers. The tighter the paper, the greater the strength. High pressure forming also helps squeeze more water out of the pulp, but the key is to make a tighter paperboard.

A third method of enhancing the compressive strength of corrugated boxes is to add various chemicals to the fibers prior to papermaking and papermaking. These additives use dryness to increase the strength of the fibers. They include, for example, corn, starch, gums, binders and heavy metals, and plastics and urea (formaldehyde) resins. In some cases, fibrous cardboard is also reinforced by chemical spraying the outer layer of the carton.

In general, chemical additives are less costly than cross-linking or other methods, but when they are more expensive to use than cartons made by adding floor and glossy weight methods, they are meaningless.

The fourth method of creating high-performance corrugated boxes is based on the lamination of two or more layers of core paper.

The layering agent can be a simple rice starch binder to create a super core paper that is sandwiched between cross-linked, pressed or conventionally strong paper.

The double corrugated carton maintains a thin, single corrugated structure but acts as a corrugated paper, which is more than 10% heavier than a single corrugated carton. But the resulting resistance exceeds 10% of the gauge pressure. The double-core carton also has a greater ring pressure strength, and at the same time, it adds the compressive strength of the carton, which plays an important role in pallet stacking at more than three heights.

We can expect high-performance corrugated cartons to advance by a further 10% over previously used corrugated cartons. The performance is 10% higher than the previous corrugated boxes.