Analysis of the hottest waterproof paper-based pac

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Analysis of waterproof paper-based packaging materials

moisture proof packaging materials refer to packaging materials that cannot or are difficult to penetrate water vapor. Commonly used moisture-proof packaging materials include paper, plastic, metal, glass, ceramics, etc. In addition to the function of conventional packaging materials, the special requirement in moisture-proof packaging is that the moisture permeability should be small. The smaller the moisture permeability of moisture-proof materials, the better the moisture-proof performance. Commonly used moisture-proof paper packaging materials include moisture-proof glass paper, paraffin paper, PVC processing paper, asphalt waterproof paper, polyethylene processing paper, aluminum-plastic composite moisture-proof paper, moisture-proof corrugated board, etc. All kinds of moisture-proof paper are generally made by adding another in unbleached sulfate chemical pulp or coating the surface of the paper with various moisture-proof chemicals, such as carboamide resin, latex, polyamide resin, asphalt, paraffin, etc., so the functional characteristics and environmental performance of moisture-proof paper are greatly affected by moisture-proof drugs. Moisture proof bag paper is used to manufacture paper bags for packaging bulk products, inorganic fertilizers, daily discharged wastes and other goods under high humidity transportation conditions

the function of moisture-proof packaging is to slow down or block the speed of external moisture infiltration into the packaging through high moisture resistance packaging materials, or at the same time absorb the moisture infiltration into the packaging with desiccant, so as to maintain the moisture content of goods and obtain a certain storage period. At present, the general moisture-proof packaging can meet certain moisture-proof packaging requirements by using moisture-proof paper packaging or plastic film packaging with high moisture resistance. However, puffed food or other high-grade commodities with high moisture-proof packaging requirements also need to be sealed with desiccants to ensure the quality requirements of food flavor or crispness

I. green moisture-proof paper-based packaging materials

the production process of green moisture-proof paper-based materials mainly involves the selection of fiber raw materials, the addition process of main chemical additives and the regeneration and recovery process of target products. The following is a green process for making moisture-proof paper by using natural color needle KP pulp and waste pulp mixer. This process mixes a certain amount of waste pulp with wood pulp, which saves wood resources on the one hand, and makes full use of recycled 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 paper. The added PPE resin is an environment-friendly and efficient wet strength additive, which not only has good wetting strength effect, but also has obvious drying strength effect. The fracture length index of the target product is more than 6000m, and the wet dry strength ratio is 48%. In addition, for the regeneration and recovery of products, after the high-strength water-resistant packaging paper prepared by this process is fully matured in an oven at 150 ℃, an appropriate amount of hypochlorite bleaching solution can be used, soaked at 30 ℃ ~ 50 ℃ for 10min ~ 30min, and then slightly dredged by a dredger to form a pulp. The treatment process is easy to operate, simple and easy to operate, reducing the load of the papermaking process on the environment and the waste of resources. Therefore, using this process to produce moisture-proof packaging paper is only a production process with good environmental coordination

II. Moisture resistant corrugated cardboard

corrugated cardboard is the most widely used cardboard in packaging, especially for commodity packaging, which can be used to replace wooden boxes and metal boxes. Corrugated cardboard is processed from corrugated base paper. First, the base paper is processed into corrugated shape, and then the surface layer is bonded with adhesive from both sides to make the middle layer of the cardboard into a hollow structure. In this way, the corrugated cardboard has higher strength, and its stiffness, hardness, pressure resistance, burst resistance, ductility and other properties are higher than ordinary cardboard. The cartons made of it are also relatively strong, which is more conducive to the protection of the packaged products. Moisture resistant corrugated board is atomized with paraffin liquid at a temperature of 130 ℃ ~ 180 ℃. In the anti moisture duty, the quality of paraffin component is 30% - 45%. This kind of corrugated board has high moisture resistance, and its strength is greatly higher than that of the non impregnated board

in recent years, due to the development of synthetic resin, a kind of calcium plastic corrugated board has been produced, which can overcome some shortcomings of the original corrugated board. It has the advantages of moisture-proof, rain proof, high strength, and rich sources of materials, which are more and more widely used

calcium plastic corrugated paper refers to plastic paper with calcified filler

it is a kind of plastic packaging material, not paper packaging material. Because it is compared with cowhide corrugated paper, it is used to be called cardboard. The formula of calcium plastic corrugated paper is as follows. Surface paper: low density polyethylene 15%, high density polyethylene 45%, light calcium carbonate 40%, in addition to zinc stearate, barium stearate, antioxidant, UV absorber; Corrugated core paper: low density polyethylene 10%, high density polyethylene 45%, light calcium carbonate 40%, in addition to zinc stearate, barium stearate, antioxidant, UV absorber; Corrugated core paper: low density polyethylene 10%, high density polyethylene 40%, light calcium carbonate 50%, other additives are the same as surface paper

whether it is cow skin corrugated board or calcium plastic corrugated board, it has the characteristics of light weight, high mechanical strength, good moisture resistance, etc. the cartons made of it have good folding, small storage space, low transportation cost, can be reused for many times after use, and is easy to recycle. It is an excellent green substitute packaging for transportation

III. moisture proof flat bonded paperboard

flat bonded paperboard power line surface panel is a multi-layer material tightly bonded by two or more flat layers of paperboard. Flat bonded paperboard can be bonded to the outer and inner layers with different materials, usually using paperboard with lower performance. Cardboard is bonded with silica gel. The number of layers of cardboard depends on the requirements of cardboard boxes, and the properties of raw materials and their strength indicators should be taken into account. Compared with corrugated board, flat bonded board has higher strength index and higher pressure resistance

moisture proof flat bonded paperboard is made of moisture-proof raw materials and moisture-proof adhesive at the same time, which can achieve certain moisture-proof capacity. Some moisture-proof flat bonded plates are obtained by polyethylene treatment on the surface. Usually, the polyethylene covering layer is added to the outer layer of the rolled paperboard in advance by spraying, and then it is pressed with the paperboard on the bonding machine. In this way, the flat bonded paperboard with one or both sides of the polyethylene covering layer can be obtained. Due to the impermeability of polyethylene, adhesive with low water content must be used for bonding with paperboard, such as latex, polyvinyl acetate lotion and hot-melt adhesive. Improve the moisture resistance of dry bonded paperboard, and apply beeswax mixture on its surface. These auxiliary agents are all five toxic materials, which will not cause chemical pollution

this moisture-resistant flat bonded cardboard packing box is mainly used for products requiring sufficient strength in the packing box under high tide humidity conditions, such as vegetables, explosives, various spare parts, hardware products, etc., as well as transfer packing boxes for products transported in cold areas

IV. waterproof packaging box

waterproof packaging paper endows the same batch of packaging paper with strong waterproof function, which greatly improves its waterproof and moisture-proof ability. When bulk materials such as cement, pesticides, fertilizers, etc. are loaded, in case of rain, snow, humidity of the environment, or moisture absorption of the materials themselves, the strength of the packaging bag will not be affected, and the materials will be kept intact. Especially when it is used as a greenhouse cold proof paper quilt, it can hold water for more than a few days without penetration and leakage. Rain and snow weather. The paper is waterproof. After rain and snow, the paper is firm and can be rolled up immediately without affecting the light of the greenhouse. Because of its waterproof function, which can greatly extend the service life of paper quilt, the promotion and use of this kind of waterproof bag in plastic greenhouse has a significant impact on the world plastic machine market, with the total profit of papermaking enterprises falling from 83.78 billion in 2017; 2. Due to the increasing export volume of China's plastic machinery, 76.64 billion paper loads in 2018 will undoubtedly effectively promote the development of the basket mining project

the plant fiber raw materials of waterproof packaging paper can be wood pulp, bamboo pulp, reed pulp and straw pulp, so that the plant fiber raw materials of recycled waterproof packaging paper can be wood pulp, bamboo pulp, reed pulp and straw pulp, so as to regenerate waste pulp. It can be used alone or in combination with more than two. Its waterproof function is achieved by adding waterproof additives to the pulp. By adding rosin, aluminum sulfate, ccs-02 cationic starch and 992 waterproof agent in the process of papermaking top note, the required waterproof packaging paper can be obtained through the conventional papermaking process

the proportion of various waterproof additives to plant fiber is: add 0.5 ~ 6 parts of rosin, 4 ~ 20 parts of aluminum sulfate, 0.5 ~ 4 parts of ccs-02 cationic starch and 0.5 ~ 12 parts of 992 waterproof agent to every 100 parts of plant fiber

manufacturing process of waterproof packaging paper: take 1000kg natural color pulp, first use a hydraulic pulper to disperse it at a concentration of 2% ~ 3%. After high-frequency vibrating frame screening, large grass knots, green flakes, sand and stones are removed, and then through the purification equipment, the relatively dense impurities such as sand and iron dust in the raw materials are removed. Then, through centrifugal screening, the bulky magazines such as fiber bundles that are not suitable for paper making are removed, and after concentration and washing, the viscous substances mixed in the pulp are removed. Through the above steps, the concentration of the slurry is adjusted to 4% ~ 4.5%, and the beating treatment is carried out after the pH value reaches neutral. The straw pulp of short fiber is mainly dredged and brushed, and the coniferous wood pulp of long fiber can be cut appropriately. The beating degree of the finished pulp is controlled at Sr. The beaten slurry is sent to the slurry mixing station

in the slurry mixing tank, first add 20kg rosin, stir for about 10min, then add 20kgccs-02 cationic starch enhancer, stir for 15min, add 20kg992 waterproof agent, stir for 15vmin, and finally add 120kg aluminum sulfate. After stirring for 15min, adjust the pH value of the slurry to 5.6 ~ 6.0, and the slurry concentration to 3.0 ~ 3.5%, that is, the slurry mixing operation is completed. Then it is pumped to the pulp pool before papermaking, diluted to the concentration of 0.3% - 0.7%, and sent to the paper machine for papermaking. After dehydration and forming, mechanical pressing and drying in the dryer, the paper is formed, rewinding under the machine, and packaging, the product leaves the factory

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