Moisture-proof packaging materials refer to packaging materials that are impermeable or difficult to penetrate water vapor. Commonly used moisture-proof packaging materials are paper, plastic, metal, glass, ceramic, etc. In addition to the functions of conventional packaging materials, moisture-proof packaging materials have a special requirement in moisture-proof packaging that the moisture permeability should be small. The smaller the moisture permeability of the moisture-proof material, the better the moisture-proof performance. Commonly used moisture-proof paper packaging materials include moisture-proof cellophane, paraffin paper, polyvinyl chloride processing paper, asphalt waterproof paper, polyethylene processing paper, aluminum-plastic composite moisture-proof paper, moisture-proof corrugated cardboard, etc. Various moisture-proof paper materials are generally made of unbleached sulfate chemical pulp or coated with various moisture-proof chemicals on the surface of the paper material, such as carbon amide resin, latex, polyamide resin and asphalt, Paraffin wax, etc., so the functional properties 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 waste and other goods under high humidity transportation conditions.
The role of moisture-proof packaging is to slow down or block the penetration of external moisture into the packaging through high-humidity packaging materials or at the same time absorb the moisture that has penetrated into the packaging with a desiccant, maintain the moisture content of the product and achieve a certain shelf life. At present, the general moisture-proof packaging can meet certain moisture-proof packaging requirements by using high-humidity-proof moisture-proof paper packaging or plastic film packaging. Quality requirements such as brittleness.
1. 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 introduces a green process for manufacturing moisture-proof paper by using natural color needle leaf KP pulp and waste paper pulp mixer. This process mixes a certain amount of waste paper pulp with wood pulp, on the one hand saving wood resources, on the other hand making full use of recycled waste paper, reducing resource consumption and energy consumption, saving costs. Adding chemical additives can enhance the dry and wet strength of the paper. The added PPE resin is an environmentally friendly and efficient wet strength additive. In addition to its good effect of wet strength, it also has a more obvious effect of dry strength. The target product has a fracture length index of over 6000m and a wet-dry strength ratio of 48%. In addition, for the regeneration of products, after the high-strength water-resistant packaging paper made by this process is fully cooked in an oven at 150 ℃, an appropriate amount of hypochlorite bleach can be used at 30 ℃ ～ 50 ℃ Soak for 10 minutes to 30 minutes, and then sparsely by a thinning machine to form a slurry. The processing process is easy to operate and simple, reducing the environmental load and waste of resources in the papermaking process. Therefore, the use of this process to produce moisture-proof is just a packaging process with good environmental coordination.
2. Moisture-resistant corrugated cardboard
Corrugated cardboard is the most widely used type of cardboard in packaging, especially for commodity packaging. It can be used to replace wooden boxes and metal boxes. Corrugated cardboard is processed from corrugated base paper. First process the base paper into a corrugated shape, then use adhesive to bond the surface layers from both sides to make the middle layer of the cardboard into a hollow structure, so that the corrugated cardboard has high strength, its stiffness, hardness, pressure resistance, burst resistance, The ductility and other properties are higher than ordinary cardboard, and the carton made from it is also stronger, which is more conducive to protecting the packaged products. Moisture-resistant corrugated cardboard is atomized with paraffin liquid at a temperature of 130 ° C to 180 ° C. In the anti-moisture duty, the quality of the paraffin component is 30% to 45%. This corrugated cardboard has a high anti-moisture performance, and its strength is greatly improved compared to the unimpregnated cardboard.
In recent years, due to the development of synthetic resins, a calcium-plastic corrugated board has been produced, which can overcome some of the shortcomings of the original corrugated board. It has the advantages of moisture-proof, rain-proof, high strength, etc., and it has rich material sources and more and more widely used.
Calcium plastic corrugated paper refers to plastic paper with calcified filler. It is a plastic packaging material, not a paper packaging material. It is used to be called cardboard because of its contrast with kraft corrugated paper. 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, antioxidants, ultraviolet absorbers; corrugated core paper: low Density polyethylene 10%, high density polyethylene 45%, light calcium carbonate 40%, in addition to zinc stearate, barium stearate, antioxidants, ultraviolet absorbers; 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 kraft corrugated cardboard or calcium-plastic corrugated cardboard, it has the characteristics of light weight, high mechanical strength, good moisture resistance, etc. The carton made has good foldability, small storage space, low transportation cost, and can be used repeatedly It is easy to recycle and is an excellent green packaging for transportation.
Three, moisture-proof flat adhesive cardboard
Flat-bonded paperboard is a multi-layer material formed by two or more layers of flat-layer paperboard closely bonded. Flat-bonded paperboard can be bonded to the outer and inner layers using different materials, usually using lower-performance paperboard. The cardboard is bonded with silica gel. The number of cardboard layers depends on the requirements of the cardboard box. At the same time, the nature of the raw materials and their strength indicators should be considered. Compared with corrugated paperboard, flat bonded paperboard has higher strength index and higher pressure resistance.
The moisture-proof flat adhesive board is made of moisture-proof raw materials and is made of moisture-proof glue at the same time, which can meet certain requirements of moisture resistance. Some moisture-proof flat adhesive boards are obtained by polyethylene treatment on the surface. Usually, the outer layer of the rolled cardboard is pre-added with a polyethylene covering layer by spraying and pressing, and then pressed against the cardboard on the pressure bonding machine. In this way, a flat layer with a polyethylene covering layer on one or both sides can be obtained Bonding cardboard. Due to the impermeability of polyethylene, the glue with paperboard must use glue with little water content, such as latex, polyvinyl acetate emulsion and hot sol. To improve the moisture resistance of dry-bonded cardboard, it can also be coated with beeswax mixture on its surface. These adjuvants are all five poisonous materials and will not cause chemical pollution.
This moisture-resistant flat-adhesive cardboard packaging box is mainly used for products that require sufficient strength in the packaging box under high humidity conditions, such as vegetables, explosives, various spare parts, hardware products, etc., and the transportation of transport products in cold areas Packing box.
4. Waterproof packing box
Waterproof packaging paper is to give the same packaging paper with a strong waterproof function, so that it greatly improves the waterproof and moisture resistance. When packed with bulk materials: cement, pesticides, fertilizers, etc., in the presence of rain or snow or the humidity of the environment, or the material absorbs moisture itself, it will not affect the strength of the packaging bag and keep the material intact. Especially when used as a cold-proof paper quilt in a greenhouse, it can hold water for more than a few days without seeping or leaking. Rain and snow weather. The paper has waterproof performance. After rain and snow, the paper is quite solid and can be rolled up immediately without affecting the greenhouse light. Because of its waterproof function, it can greatly extend the service life of paper quilts. Promoting the use of this kind of waterproof packaging paper in plastic greenhouses will undoubtedly effectively promote the development of basket picking projects.
The plant fiber raw materials of waterproof packaging paper can be selected from wood pulp, bamboo pulp, reed pulp, and straw pulp, so that the plant fiber raw materials of waterproof packaging paper can be selected from wood pulp, bamboo pulp, reed pulp, and straw pulp, so as to be recycled Waste paper pulp. It can be used alone or in combination of two or more. Its waterproof function is obtained by adding waterproof additives in the slurry. Add rosin, aluminum sulfate, CCS-02 cationic starch, 992 waterproofing agent in the pulping process before papermaking, and meet the required waterproof packaging paper through the conventional papermaking process.
The ratio of various waterproofing aids to plant fibers, according to the mass ratio: 0.5 parts to 6 parts of rosin per 100 parts of plant fibers, 4 parts to 20 parts of aluminum sulfate, and 0.5 parts to 4 parts of CCS-02 cationic starch , Add 0.5 parts to 12 parts of 992 waterproof agent.
The manufacturing process of waterproof packaging paper: take 1000Kg of the original color pulp, firstly use a hydraulic pulper, and release it at a concentration of 2% to 3%. After screening through high-frequency vibration frame, to remove larger grass knots, green flakes, sand and stones, etc., and then through the purification equipment to remove the relatively dense impurities such as sand particles, iron dust in the raw materials. Then, centrifugal screening is used to remove large-volume magazines such as fiber bundles that are not suitable for papermaking, and after concentration washing, the viscous substances mixed in the slurry are removed. Through the above steps to adjust the concentration of the slurry to 4% ~ 4.5%, after the PH value reaches neutral, beating treatment. The short-fiber grass pulp is mainly deconsolidated and divided into brooms, and the long-fiber coniferous wood pulp can be properly cut. The beating degree of the slurry is controlled at 24-32 ° SR. The beaten pulp is sent to the late batching.
In the slurry tank, first add 20kg rosin, stir for about 10min, then add 20kg CCS-02 cationic starch enhancer, stir for 15min, add 20kg992 waterproofing agent, then stir for 15vmin, and finally add 120kg aluminum sulfate, after stirring for 15min, adjust the slurry The PH value is 5.6 ~ 6.0, the slurry concentration reaches 3.0% ~ 3.5%, that is, the slurry adjustment operation is completed. Then pumped to the pre-copying pulp tank, diluted to a concentration of 0.3% to 0.7%, sent to the paper machine to make paper, through dehydration forming, mechanical pressing, drying in the drying cylinder to reach the paper, rewinding the machine, the packaging becomes the product Leave the factory.
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