Buffer paper packaging material structure

With the country's emphasis on "white pollution", using environmentally-friendly materials instead of foam plastics as a cushioning packaging material has become a development trend, and all-paper packaging has also become a new favorite of modern packaging that avoids trade barriers. In recent years, the structural development of paper packaging materials has been rapidly developed. The structure of the buffer material also changes from a single type to a complex type, and from a process type to a functional type. An overview of the structural development of cushioning paper materials is given here by taking paper honeycomb materials, corrugated cardboard and pulp molded products as examples.

Paper honeycomb material

Paper honeycomb is known for its advantages of light weight, environmental protection, sound insulation, shock resistance, and cost-effectiveness. It is mainly used to make impact cushions or vibrations that are absorbed by cushion cushions during transportation or handling. The structure of the paper honeycomb mainly includes a regular hexagonal shape, a hexagonal shape with reinforcing bands, a rectangular shape, a prismatic shape, a corrugated shape, a square shape, a sparse circular shape, a close-packed circular shape, and a triangular shape. The traditional paper honeycomb structure (Fig. 1) is in the form of a regular hexagon. It is glued and pasted on a multi-layer paper, cut into pieces after drying, and then opened to form a regular hexagonal structure. The hexagonal paper honeycomb is a labor-intensive product and is not suitable for fully automated production.

In 2000, Pflug filed a patent for a folded corrugated paper honeycomb (Fig. 2), which was produced by adding original slitting, rolling, folding and pasting processes to a corrugated cardboard production line. Corrugated cardboard folding honeycomb is difficult to paste and cut, and the corrugated paper honeycomb has a very high unidirectional compressive strength, which is particularly suitable for buffer packaging of heavy products.

In 2004, Basily invented a 3D paper honeycomb (Fig. 3) made directly from paper by means of a moulding process. It is suitable for automated production and has isotropy in two orthogonal directions. Such a packaging material can reduce the number of producers. Cost, space saving, minimal use of materials, it is a new force to guide the reform and innovation of packaging materials. The 3D folded paper honeycomb core of Figure 3 is processed from kraft paper, which can be produced from sheet-fed paper. The 3D folding type paper honeycomb core adopts a new packaging machinery technology, which can be produced at a high speed, and its production cost is lower than the current production cost of the traditional paper honeycomb core.

The main feature of the 3D folded paper honeycomb core is that they can absorb a large amount of energy compared with the current cellular structure's loss prevention and vibration resistance. In addition, the 3D folded core can increase the energy absorption rate of the unit material and reduce its cost.

Basily and Elsayed's invention of ChevronPattern folding can be done in the form of a square block (Figure 4(a)) or a cylindrical bucket (Figure 4(b)). ChevronPattern folding cores can greatly reduce the size and weight of the package, save the manufacturer's resources and funds, and can achieve lightweight packaging in the delivery process.

Since the 3D folding type paper honeycomb can be rotated, wound, and bent, it can be conveniently used for processing any packaging products, and the packaging of the 3D folding type paper honeycomb is relatively small, lightweight and has a good function of protecting the product. Irregular fragile products can be wrapped in 3D folded paper honeycombs and placed in other packaging containers (Figure 5). The new paper folding technology can be used to make the packaging without printing, and this folding technology can be used to make the company's LOGO, the required physical color and so on. The 3D folded paper honeycomb can act as a promotion as well as protect the product against shock and vibration.

In order to further improve the processing performance of the paper honeycomb core and improve its automated production capacity, in 2007 the author developed a variety of honeycomb sandwich structure suitable for paper processing, it uses two kinds of corrugated paper alternately layered and laminated. to make.

Corrugated cardboard

In order to replace foam plastics, people have used corrugated board structures to develop a variety of corrugated board type cushioning packaging materials. In 1996, Kim DoWook and KimKiJeong developed double-ply reinforced corrugated cardboard on the basis of the original corrugated paperboard (Fig. 6). The original three-layer corrugated paperboard was changed into two layers of corrugated corrugated layers, which basically did not increase. The thickness of the corrugated board adds to the compressive strength of the corrugated board. MyungHoonLee and other five different structural forms [single SW, double DW, single layer with double sandwich DM, double layer with a double sandwich (AA'+ Aflute) DMA, double layer with a double sandwich The (AA'+Bflute) DMB] corrugated cardboard undergoes a four-point bending test in the MD and CD directions. The results show that the new structure of corrugated cardboard has better structural advantages than conventional corrugated cardboard. Guo Wei also conducted comparative experiments on 4-layer double-ply corrugated cardboard and 5-layer corrugated cardboard. Guo Yanfeng analyzed the structural features of X-PLY super corrugated paperboard, and conducted comparative tests of burst strength, puncture strength, flat compressive strength, and side pressure strength. In 2007, the author tested the static compression and dynamic compression performance of a variety of corrugated composites (Fig. 7), and compared the bearing and cushioning properties of different corrugated composites. The folding type corrugated composite material has high carrying capacity, and its static buffer energy is also relatively large, which is more suitable for the buffer packaging of products with heavy weight and hard surface. 0/90/0 cross * Stacked corrugated composite materials and 0/0/0 parallel stacked corrugated composite materials have very similar cushioning properties, but their carrying capacity is not high, but they have good resilience and are more suitable for poor surface hardness and easy Broken, crispy product packaging.

The load-bearing properties of the corrugated/honeycomb/corrugated composites largely depend on the mechanical properties of the honeycomb core. The corrugated/honeycomb/corrugated composite material greatly increases the thickness of the composite material with few materials, and its buffer energy absorption efficiency is improved compared to a simple corrugated stack. Later, the author improved the original corrugated sandwich structure and invented the high-elastic corrugated cardboard structure (Figure 8).

Pulp moulded products

Pulp molded products are mainly used in industrial products packaging, poultry egg trays, fruit trays, food and semi-finished packaging, medical apparatus packaging, making children's toys, drama props, crafts billets, furniture, parts and other special materials, military , clothing and other industries packaging. Pulp molded products are generally processed using multiple sets of molds. With the improvement of mold technology, cavity-shaped pulp molded products can now be produced. This type of pulp molded product is often used as a container or ornament [13]. The combined processing form is achieved through a combination of a plurality of different shapes of the pulp molded body to achieve a certain application needs to complete the desired packaging function. Disposable pulp molded urinals in foreign countries have replaced the multiple uses of urine made from polyester materials. Therefore, with the improvement of the mold technology, the structure of pulp molded products has become more and more complicated and detailed.

In addition to the traditional honeycomb paperboard, corrugated paperboard and pulp model products, foamed paper particles that currently meet environmental protection requirements have also been gradually developed and used in the buffering of electronic products. A company in Hamburg, Germany, shreds used paper and mixes it with starch. The slurry is made into granules, placed in a sealed container, subjected to high pressure and high temperature steam, and then rapidly depressurized. The pellets are foamed. The formation of porous beads made of foam packaging material (Figure 9), can be used as a buffer material, buffering performance than EPS. Suitable for buffer packaging of electronics, instruments and sensitive materials.

In summary, with the increasing demand for environmental protection and packaging reduction in recent years, and the further improvement of electromechanical technology, the structure of cushioning materials has been rapidly developed, with different structures and buffer materials suitable for special products. Its structure came into being. The structure of the buffer material is changed from a single type to a complex type, and from a process type to a functional type. Paper honeycombs have evolved from traditional structural changes into innovations in the molding process; corrugated paperboards have also been transformed from a single corrugated structure to a corrugated composite structure; pulp molded products have become increasingly fine-grained and structurally complicated as mold technology has been further refined.

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