Market requirements of the hottest export fruit ca

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The market requirements for exporting fruit cartons

putting a coat on fruits provides irreplaceable important conditions for fruit distribution and sales. Fruits have many special requirements for packaging, such as: the packaging must protect the contents from damage during distribution, and maintain its shape and strength after being saturated with relative humidity for a long time or sometimes soaked in water; In the packaging design, the field heat of the product is allowed to be discharged, as well as the rapid cooling and continuous removal of the respiratory heat of the product when it is transported to the low-temperature storage or transportation temperature; Because many products are crisp and tender, the packaging should be able to withstand stacking and suitable for large volume operation; If used for exhibition, the packaging should be able to attract consumers. Although the fruit packaging varies with different materials, sizes and shapes, it is mainly corrugated boxes, especially the export fruit cartons with high requirements for printing fineness

carton packaging suitable for exporting fruits

the structure of corrugated board includes two-layer corrugated board, three-layer corrugated board, five layer corrugated board, or even seven layer corrugated board. Then, which kind of cardboard is generally used in fruit carton packaging? According to the packaging engineer of a fruit Management Co., Ltd., since the two-layer corrugated board is 20% bonded with a lining paper and a layer of corrugated base paper, the cost is low, In fruit packaging, which is related to the performance and quality of deformation, stamping, cutting and other processing with stainless steel as raw material, it is only used as spacer and liner; Single corrugated board, that is, three-layer corrugated board, is generally used for internal packaging, as well as lattice board or layered liner; Double corrugated board, namely five layer corrugated board, is usually used for export packaging because of its good compressive strength

the corrugated width and height will affect the pressure, flat compression strength, edge compression strength and rupture strength of corrugated board. As for the choice of corrugated type, the packaging engineer told them that they mainly follow the following principles: type a corrugated and type C corrugated are suitable for fruit packaging because of their high compressive strength and stiffness, as well as good cushioning performance; E-type corrugated is mainly used for small folding cartons, which provides a flat surface for high-quality printing and labeling patterns; The outer lining paper needs high tensile strength, while the inner lining paper needs good stiffness; Recycled paper is cheaper than imported paper, but its tensile strength is low

as for the requirements of carton production adhesive, the engineer believes that starch adhesive is very ideal for packaging under conditions other than high humidity, but the storage and transportation environment encountered by export cartons is difficult to predict, so it is required that all export packaging must use waterproof adhesive. Waterproof adhesive is essential to prevent the delamination of paperboard and packaging failure. Special waterproof adhesives can be obtained by adding waterproof chemicals to starch

in addition, the engineer also mentioned that when designing corrugated boxes for fruits, we should not only consider the needs of fruits, but also take into account the requirements of the market, such as the quantity and quality of materials used, as well as the combination methods, including packaging, sealing, handling, palletizing, stacking and other specific issues

requirements for export fruit cartons during storage and transportation

vertical pressure in stacking is usually the most important aspect of fruit packaging. The cracking of the bottom of the box will not only damage the packaged fruit, but also spread the whole package. Therefore, there will be enough vertical corrugations on the top of the box and the edge of the cardboard to have sufficient compressive strength

in many developing countries, pallets have been widely used in the transportation of many commodities, including fruit packaging. The package stacking on the pallet can form a containerized cargo suitable for mechanized handling. The advantage of using platform service reward funds to transport pallet packaging is that the labor cost in handling is greatly reduced; Reduced transportation costs; It is conducive to protecting goods and reducing losses; It is suitable for mechanized handling, with fast speed; By increasing the stacking, the storage space can be effectively used, and the tray also promotes the use of standard sizes

traditional pallets are usually made of wood, but now they are also made of cardboard, plastic, metal or mixed materials. The simplest wooden pallet is designed in two-way forklift and four-way forklift. Four way forked pallets are difficult to manufacture, but they are needed by both transporters and the market. Many countries, including all European and North American countries, use international standard pallets. The size of this kind of tray is 1.2 m 1 m, and the size of other widely used trays is 1.2 m 0.8 m and square 1.1 m 1.1 M

marine refrigerated containers are often used for fruit export. Effective space utilization in the container prevents high transportation costs. Shipping containers have standard actual dimensions, which are 6.1m or 12.2m long, 2.44m wide and 2.44m or 2.59M high respectively. The internal dimension changes with the structural method and refrigeration equipment. The minimum internal width is 2.22 meters, which enables any kind of tray system to be used. Loose packaging can be stacked in the top space, which changes with the structure of the container. If the packages are stacked loosely, they should be effectively suitable for shipping containers, suitable for 1.1 meters square pallets with the increase of tension. Any package designed according to this pallet can certainly be loaded with shipping containers, and the minimum width of this kind of container is 2.25 meters

other requirements

from the packaging engineer, we also get some experience. For example, we usually know the performance of imported packaging according to some packaging that importers particularly like, and meet the needs of retailers. Net weight is very important. Sometimes the size of the package must be changed to meet the weight requirements. Years of experience has proved that the ratio of length to width is 1.5:1, which is the most acceptable for importers. The ratio of length to width is close to 1:1, which is not only unpopular in appearance, but also difficult to apply to pallets. In addition, the packaging of length: width: height is 2:1:2. Although the material is the most economical, it is not stable in stacking. This increases the problems in transportation and storage. Therefore, it is not practical to consider the problem only in saving materials

the packaging of fruits should conform to the mechanization of packaging, and cartons must be designed according to the requirements of the machine. Generally speaking, the volume of boxes packed by machines is larger than that packed by hand

air circulation can reduce the temperature of fruits, so corrugated boxes containing fruits are generally opened with pores. The air passing through the vent can also prevent the heat generation of fruits in the oxidation process. Vent is very important for cold storage of fruits, especially compressed air cold storage. Pores promote the evacuation of ethylene produced by fruits, but are not very important for the conversion of oxygen and carbon dioxide. Because these gases can flow through cardboard. If a plastic bag is used in the carton to reduce the oxygen content in the air around the fruit, the vent will almost have no effect. On the contrary, high humidity will be generated in the plastic bag to accelerate the decay of the fruit

the diameter of the vent hole is usually 25 mm ~ 30 mm, and the total area of the hole cannot exceed 3%~5% of the whole packaging area, unless compressed air freezing is required. If there must be a handle hole, the vent hole should be placed on the top of the box wall. Two smaller finger holes occupy 30 mm of space, which is smaller than the pressure reduction caused by one handle hole, and also reduces the risk of finger damage to fruit. The number and size of air vents should be determined according to the physical conditions of the fruit, such as the shape of the fruit, the storage conditions of the box, etc

the compressive strength of corrugated boxes is affected by humidity, which is caused by many factors. But it is mainly water vapor in the air. Other sources, such as water vapor on the surface when the package is removed from the cold storage in rainy days, and water evaporated from the fruit inside the corrugated box. As the humidity in the paperboard increases, the compressive strength decreases rapidly. Therefore, waterproof treatment should be adopted to maintain the compressive strength of the box. The surface coating can prevent rain and condensation, but it can only relatively reduce the absorption of water vapor. The corrugated box treated by impregnation can prevent moisture for a long time, and can also improve the compressive strength and stiffness, especially the compressive strength of low gram weight or poor quality paperboard

if the moisture resistant agent is added to the pulp in the production process, the waterproof performance of the paper can be improved. The surface of the box and paper can also be waterproofed by pouring or dipping wax, or using a certain high polymer coating. The paperboard is immersed in dissolved wax, and the wax is coated on the corrugated paper core and layer paper, which can be almost completely waterproof

the quality of the coating required varies with the application method of moisture-proof agent. If the corrugated board is coated with wax and treated with spray, the amount of wax is 30 grams per square meter; In case of immersion treatment, 200-300 grams per square meter. The moisture-proof treatment of resin and high polymer is different, but it is usually 10-20 grams per square meter

sealing is a simple and important procedure. The usual method is to use liquid adhesive, tape adhesive, staples, and packing tape. Hot melt adhesive is suitable for continuous mechanized operation, with high efficiency, and is suitable for two-layer fruit packaging. Polypropylene plastic packaging belt is usually used for fruit packaging, which can easily use the structural characteristics of the machine and tie the packaging tightly. The sealing tape used for fruit packaging is transparent or opaque pressure-sensitive tape, which is convenient to use and moderate in price

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