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Introduction of moisture-proof and waterproof paper-based packaging materials (on)

Moisture-proof packaging information refers to packaging materials that are impervious or difficult to pass through water vapor. Commonly used moisture-proof packaging materials include paper, plastic, metal, glass, ceramics, etc. In addition to the utility of conventional packaging materials, the special requirements for moisture-proof packaging in moisture-proof packaging are that the moisture permeability is small. The lower the moisture permeability of the moisture-proof data, the better the moisture-proof function. Commonly used moisture-proof paper packaging materials include moisture-proof cellophane, white wax paper, polyvinyl chloride processing paper, asphalt waterproof paper, polyethylene processing paper, aluminum-plastic composite moisture-proof paper, moisture-proof corrugated cardboard, and the like. Various moisture-proof papers are usually added to unbleached kraft chemical pulp or coated with various moisture-proof chemicals such as carbonamide resin, latex, polyamide resin and asphalt. White wax, etc., so the function of the moisture-proof paper is greatly affected by the moisture-proof drugs. Moisture-proof bag paper is used to make paper bags for packaging bulk products, inorganic fertilizers, wastes that are usually discharged, and other goods under high-humidity transport conditions.

The effect of the moisture-proof packaging is to slow down or isolate the moisture from entering the package through the high-moisture packaging data or to absorb the moisture permeating into the package together with the desiccant, and to maintain the water content of the product and obtain a certain shelf life. Nowadays, the moisture-proof packaging usually uses high-moisture moisture-proof paper packaging or plastic film packaging to reach a certain moisture-proof packaging request. However, for the puffed food or other high-grade products that require high moisture-proof packaging, it is necessary to seal the desiccant to ensure the flavor of the food. Or quality requests such as brittleness.

1. Green moisture-proof paper-based packaging materials

The green moisture-proof paper-based data production process is mainly concerned with the selection of fiber raw materials, the increase of primary chemical additives, and the recycling technology of the policy products. The following describes a green technique for making moisture-proof paper using a natural needle KP pulp and a waste paper pulp mixer. This technology mixes a certain amount of waste paper pulp with wood pulp, which saves wood resources on the one hand, and uses the recovered waste paper on the other hand, reducing resource consumption and energy consumption, and saving costs. Adding chemical additives can enhance the dry and wet strength of the paper. The added PPE resin is an environmentally-friendly and high-efficiency wet strength additive. In addition to having a good moisturizing effect, it also has a significant effect of increasing dry strength. The long-term target of the produced product reached more than 6000m, and the wet-dry strength ratio reached 48%. In addition, regarding the recovery and recovery of the product, the high-strength water-resistant wrapping paper produced by this technology can be appropriately matured in an oven at 150 ° C, and an appropriate hypochlorite bleaching liquid can be selected at 30 ° C to 50 ° Soaking at °C for 10min~30min, and then finely dissolving the solution to form a slurry. The process is easy to operate, simple and easy, and reduces the environmental load and resource dross of the papermaking process. Therefore, the use of this technology to produce moisture-proof is only a kind of packaging paper production technology with good environmental coordination.

Second, the moisture-resistant corrugated cardboard

Corrugated board is one of the most widely used types of paperboard, especially for product packaging, and can be used to replace wooden crates and metal boxes. Corrugated cardboard is made from corrugated base paper. First, the base paper is processed into a corrugated shape, and then the surface layer is bonded from both sides with an adhesive to make the middle layer of the cardboard into a hollow structure. Thus, the corrugated cardboard has high strength, and its stiffness, hardness, pressure resistance, and breakage resistance. The ductility and other functions are higher than the usual cardboard, and the carton made of it is also relatively hard, which is more conducive to the maintenance of the packaged product. The moisture-resistant corrugated board is atomized with white wax at a temperature of 130 ° C to 180 ° C. In the moisture resistance duty, the quality of the white wax component is 30% to 45%. This corrugated cardboard has a high moisture resistance function, and its strength is greatly improved compared with the unimpregnated paperboard.

In recent years, because of the development of synthetic resins, a calcium-plastic corrugated board has been produced that can overcome some of the defects of the original corrugated board. It has the advantages of moisture, rain and strength, and the data is rich and widely used.

Calcium plastic corrugated paper refers to plastic paper with calcified filler. It is a kind of plastic packaging materials, not paper packaging materials. Because it is compared with cowhide corrugated paper, the habit is called cardboard.

The formula of calcium-plastic corrugated paper is as follows. Appearance paper: low density polyethylene 15%, high density polyethylene 45%, light calcium carbonate 40%, other zinc stearate, barium stearate, antioxidant, UV absorber; corrugated core paper: 10% low density polyethylene, 45% high density polyethylene, 40% light calcium carbonate, other zinc stearate, barium stearate, antioxidant, UV absorber; corrugated core paper: low density poly Ethylene 10%, high density polyethylene 40%, light calcium carbonate 50%, other additives are the same as the appearance of paper.

Whether it is cowhide corrugated cardboard or calcium-plastic corrugated cardboard, it has the characteristics of light weight, high mechanical strength and good moisture resistance. The carton made is good in folding, small in storage space, low in transportation cost, and can be reused repeatedly after use. Easy to retract, it is an excellent green wood packaging for shipping.

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