Cardboard is the main raw material for the production of corrugated cartons, cartons, and other products. How its performance directly or indirectly affects the product's internal quality and use results.
For corrugated boxes, cartons and other packaging products, it has wear-resistant, waterproof and moisture-proof properties, and has high strength and good airtightness. It is the basic quality requirement for the use of cardboard. However, ordinary paperboards produced by paper mills often do not have good abrasion resistance, water resistance, and moisture resistance. The strength and airtightness of cardboard vary depending on the quality level of the board. Therefore, in order to improve the performance of corrugated boxes and cartons, it is necessary to carry out some necessary processing and processing of the surface of the cardboard in order to fundamentally improve the performance and appearance quality of the cardboard.
First, the board surface coating process
Glossing is a commonly used process for post-printing of packaging products. After the surface of the product is coated with glaze, the printed product can enhance the properties of water resistance, light resistance, friction resistance, and stain resistance, as well as increase the surface brightness of the product. The grade of the product has been greatly improved. Gloss coating has a variety of structures, such as oil-based coating varnish for printing presses, water-based and oil-based varnish for varnishing, solvent-based varnish, and UV varnish. The characteristics of glazing coatings are different, and the process effects of product surface processing are also somewhat different. The same kind of bright paint, because of the material characteristics, different formulations, the gloss effect, wear resistance, etc. are also different. With matte coating, the surface of the printed product has almost no glossiness, but it has a certain sense of art. Some products have a matte coating and the process effect is no less than that of a bright coating. Whether it is light or matt coating, the coating must have good abrasion resistance in order to protect the surface of the print.
Oily glazing process features. With the oiling varnish of the printing machine, the gloss and abrasion resistance of the surface of the printing product are limited by the structure of the coating due to the thickness and drying of the coating coating, and the effect of the solvent-based or water-based coating on the optical machine is not as above. Therefore, this kind of glazing is generally only suitable for ordinary products with small batches and low quality requirements.
Solvent polishing process features. Solvent polishing products have high surface gloss and abrasion resistance, but because the diluent is an organic solvent.
Such as toluene, etc., with the volatilization of the solvent, the cost of the coating coating is also large. The solvent coating coating has poor resistance to physical properties and the coating tends to be yellowish. Moreover, the odor-rich solvent not only tends to pollute the environment, but also has a certain impact on the production safety. Therefore, the production site must pay attention to exhaust emissions, and the machine uses an electric heating tube. Drying, we must pay attention to maintaining the smooth transport of cardboard, cardboard to prevent skewing and blocking the drying of the road so as to touch the electric heating pipe, causing fire accidents.
Waterborne coating features. The waterborne coating has a colorless, odorless, non-toxic, non-irritating, coating drying speed, wear resistance, high temperature resistance, no yellowing, no discoloration, and has good transparency and high gloss, so the process is more suitable In the food packaging surface finishing processing. However, the solvent of water-based coating oil is water, and the printed product is prone to deformation after it is glazing. Its abrasion resistance is second only to the solvent glazing coating. If the outer layer of the cardboard is packaged with PVC plastic film, the surface of the PVC plastic film is likely to be sticky, and the glazing film and the graphic ink color of the printing material are easily damaged. Therefore, the outer packaging material is a PVC plastic film. The cardboard coating should not use water-based paint, but should use a solvent-based wear-resistant glazing paint for glazing.
UV coating process features. UV coating is the use of UV coating on the surface of the printed material, the surface of the film to form a high gloss. After the glazing film is irradiated with ultraviolet light, photopolymerization reaction and photocrosslinking reaction take place inside the coating layer, thereby rapidly solidifying and drying, so that no blocking quality failure occurs, and it is favorable for ensuring fast operation of subsequent processes. UV coating has the advantages of wear resistance, chemical resistance and chemical resistance, and good stability. Since UV varnish has no problem of solvent evaporation, unlike the solvent-based varnishing process, the environmental pollution caused by the solvent coating process is relatively small, and its production cost is far lower than that of the coating process. Therefore, it is an ideal process to replace plastic coating and solvent-based coating. However, in production, the problem that should be paid attention to is that the UV coating will have a certain stimulatory effect on the human skin. UV light will also cause certain damage to the human body. The coating will produce ozone after being dried by UV irradiation. The production site should have good Ventilation exhaust.
Second, paper packaging products on the coating requirements
In terms of product use and processing characteristics, glazing coatings must meet the basic requirements of safety, hygiene and environmental protection. Therefore, glazing oils have better flexibility, leveling, abrasion resistance, acid and alkali resistance, and adaptability. In addition, the varnish must have high transparency and non-discoloring properties, and its surface film layer should have good toughness so as to better protect the surface of the printed product and enhance the waterproof, moisture, dirt, and abrasion resistance of the product package. And other properties.
The calender process calendering on the cardboard surface is a deep processing process based on glazing. The production process is roughly as follows: the printed product is first polished with a polishing machine, and after the film is dried, it is hot-pressed with a calender to form a smoother and brighter mirror effect on the coating layer. This is a quality effect that can not be achieved by the general glazing process. Therefore, this production process is more used for surface finishing of preprinted corrugated cartons, cartons and other packaging products. Traditional calendering paints use toluene, cyclohexanone and other organic solvents as diluents. Not only is it easy to pollute the environment and endanger the health of the human body, but it also tends to cause pollution to the product and leave potential safety hazards for the packaging of the product. Therefore, it is not suitable for the packaging of food and medicine. From the perspective of packaging safety, non-toxic, odorless, non-polluting environment-friendly water-based calendering oils should be used.
The process of processing the wax on the surface of the paperboard through the wax process is simple and the operation is very easy to master. The process is to use a waxing machine to heat the melted paraffin liquid and evenly apply it to the paperboard or printed material. On the surface, when the paraffin coating on the paper is cooled, it is solidified to form a thin layer of very smooth waxy film, so that the paper surface has better waterproof, moisture, mold, dirt, rust, Oil and abrasion resistance, so this process is commonly used in the surface processing of food packaging, paper packaging and other non-moisture resistant products.
The spraying process of the paperboard surface uses a laminating machine to spray a layer of polyethylene or polypropylene with a thickness of 0.01mm to 0.07mm on the surface of the paperboard, so that the airtightness and the tensile strength of the paperboard are better improved. Makes the moisture-proof, waterproof, oil-proof and anti-dirty properties of the paperboard greatly improved. In recent years, with the continuous prosperity of the market economy, liquid beverages, solid frozen foods and other products have become more and more demanding for laminating paperboard, and the laminating technology has become more and more mature. According to the characteristics of the product, the processing of the coating of the paperboard has single-sided and double-sided. Double-sided laminating paperboard, printing quality control 4 points, if the process is not properly controlled, prone to imprinting bottom quality problems. That is to say. The ink is printed on the PE lamination film without absorption properties and it is easy to stick the back of the dirty product. Therefore, the use of non-drying device printing lithographic printing machine double-sided laminating paperboard, should use wear-resistant, strong adhesion, non-absorbent ink printing, in order to ensure product quality.
The surface coating process of the paperboard is a commonly used finishing process for preprinted paperboard, paper boxes, handbags, and covers. After being coated, the printed product can achieve waterproof, anti-fouling, anti-discoloration, heat-resistance, light resistance, and friction resistance. At the same time, it can enhance the glossiness, aesthetics, puncture strength, and tensile strength of the product and improve the use of the product. Life and packaging quality. The general process of laminating film is: After the product is printed, the laminating machine is used to combine the plastic film with the surface of the printed material to form an integral structure, forming a printed matter of paper and plastic. The coating process is divided into a coating film and a pre-coating film; there are also thermal and cold coating processes. Film-coated adhesives are also available in different types, both water-based and solvent-coated. Solvent coating film has a high brightness, but there is a problem of environmental pollution, and the solvent of water and tantalum coating adhesive is water, and there is almost no pollution to the product and the environment. Therefore, it is widely used for the surface finishing of food packaging. Because the coated products need to be classified for processing during recycling, the regeneration process is relatively complicated and the production cost is high. Some packaging products are being replaced by calendering or UV coating processes.
Third, the function of corrugated board production process
Functional corrugated cardboard is a new type of packaging material. Its difference from ordinary corrugated cardboard is that the original paper or carton is processed through special technical processes, which expands the function of the carton, and also improves and improves the quality of the carton. Increase the added value of products to meet the individual needs of product packaging.
From the perspective of logistics characteristics, product characteristics and market requirements, functional corrugated cardboard is an important production technology process for improving the quality of commodity packaging and effectively protecting commodities.
Waterproof corrugated board production process Waterproof corrugated board The main performance is that the board surface is impervious to water, but it cannot be immersed in water, otherwise it will start to permeate and break from the inner layer. Its main processing technology is: the curtain coating method is about to melt. The synthetic resin or paraffin mixture flows down from the hopper 13 as a film and is coated on horizontally running corrugated cardboard, after the surface of the cardboard is coated with a resin film or a wax film. That is, it has good water-blocking performance and abrasion resistance. This corrugated paperboard is mainly used for packaging pickled products, fruits and vegetables products and frozen foods, etc. Since the corrugated paperboard surface has a soft paraffin layer, so. Also suitable for packaging high abrasion quality furniture, high-end goods or industrial equipment.
Hydrophobic corrugated board manufacturing process Hydrophobic corrugated paperboard is also known as water-repellent corrugated paperboard. This kind of corrugated paperboard has high water repellency. When exposed to wet objects or when it is rained or splashed, the waterproof paperboard surface has certain water repellent properties. So that the water droplets do not soak into the cardboard fibers. Its processing technology is: first coating the cardboard processing and processing, such as the coating of Varnish, wax, silicone and other hydrophobic substances.
Before coating the varnish, it is best to apply a starch film layer on the surface of the cardboard first, and then apply the varnish after the film is dried. Silicone not only has good water repellency, but also has flame retardant, corrosion resistance, temperature resistance and other properties. Paraffin coating has a high degree of smoothness, wear resistance, water repellency is better. Adding appropriate amounts of water-resistant additives, such as polyvinyl butyral and melamine-formaldehyde resin, to the hydrophobic coating can improve the water resistance of the coating and can improve the water repellency of the corrugated paperboard surface. Therefore, the hydrophobic corrugated carton is suitable for packaging powdery substances that are easy to agglomerate after absorbing moisture, as well as refrigerated foods, which can better protect the product.
Water-resistant corrugated board production process Water-resistant corrugated board differs from water-repellent and hydrophobic corrugated board in that when it is soaked in water for a long time, its strength will not drop significantly. This kind of good performance and its processing Process characteristics related. This production process can use wax automatic paper feeder to continuously send the corrugated board into a paraffin wax bath at a temperature of about 90° C. After continuous dipping between 6 seconds and 12 seconds. According to the quantitative and different layers of corrugated board, it can be properly grasped. It is appropriate to use corrugated cardboard to penetrate corrugated board. After the corrugated board is saturated with the wax liquid, the corrugated board can be taken out of the wax tank and the excess wax liquid is removed, and then slowly moved in a hot drying room at about 10° C. to further uniformly penetrate the wax into the cardboard fibers. At the same time, the local excess wax is leveled. The wax-waxed corrugated cardboard after completion of the heat drying is forced to cool under normal temperature conditions to solidify the wax liquid. After paraffin wax processing, the corrugated board gets better water resistance. This carton is particularly suitable for holding live fresh seafood, frozen fruit and other products with high moisture content. There is also a water-resistant processing method for reinforcing paperboard by adding a water-resistant reinforcing agent directly to the papermaking pulp. The water resistance of the paperboard is improved, and at the same time, it is possible to better prevent powdering, hair loss and the like on the paperboard surface.
Preservation of corrugated board production process Preservation of corrugated board is the use of special processing technology, so that the cartons in the packaging of fresh fruits and vegetables. It can reduce the loss of water in the contents, inhibit the growth of bacteria, and absorb the bad gas inside the box. Make fruits and vegetables better preservation effect. General preservation corrugated board production methods are: sandwich molding, compound type, foaming type and mixed type, sandwich type is the plastic film after the antibacterial agent, preservatives soaked in corrugated cardboard, and then in The corrugated carton is coated with a preservative. This corrugated carton not only effectively prevents the evaporation of water, but also has the effect of regulating and controlling the temperature and keeps the goods in the box fresh. The composite type combines the aluminum-coated cling film with the inner surface of the corrugated carton, so that the cabinet has the function of absorbing ethylene gas, preventing moisture from evaporating, and at the same time reflecting radiant heat and preventing the temperature inside the cabinet from rising. And then play a role in preservation. Foaming is the combination of foamed plastic and corrugated board, which has better preservation effect than the former two methods. It is better in suppressing moisture evaporation, controlling thermal resistance and airtightness. The production process of mixed corrugated board is: adding porous type ethylene gas absorbing powder into paperboard or coating special paper powder that can emit infrared light with a certain wavelength on the base paper. Cardboard boxes made from this kind of cardboard can activate some of the molecules in fruits and vegetables. Enhance the function of resisting microbial erosion and improve the process effect of fresh-keeping packaging.
In summary, the paperboard surface treatment is an important technical means to increase the added value and quality of goods, improve the packaging quality and packaging quality of products, effectively prevent the damage of packaging and commodities, and enhance the market competitiveness of commodities. and so. Correctly understanding the production process and methods of cardboard surface technology processing, and selecting the proper packaging technology according to the characteristics of the commodity, will undoubtedly have a good promotion effect on improving the promotion of commodities and improving the economic benefits of the enterprise.
For corrugated boxes, cartons and other packaging products, it has wear-resistant, waterproof and moisture-proof properties, and has high strength and good airtightness. It is the basic quality requirement for the use of cardboard. However, ordinary paperboards produced by paper mills often do not have good abrasion resistance, water resistance, and moisture resistance. The strength and airtightness of cardboard vary depending on the quality level of the board. Therefore, in order to improve the performance of corrugated boxes and cartons, it is necessary to carry out some necessary processing and processing of the surface of the cardboard in order to fundamentally improve the performance and appearance quality of the cardboard.
First, the board surface coating process
Glossing is a commonly used process for post-printing of packaging products. After the surface of the product is coated with glaze, the printed product can enhance the properties of water resistance, light resistance, friction resistance, and stain resistance, as well as increase the surface brightness of the product. The grade of the product has been greatly improved. Gloss coating has a variety of structures, such as oil-based coating varnish for printing presses, water-based and oil-based varnish for varnishing, solvent-based varnish, and UV varnish. The characteristics of glazing coatings are different, and the process effects of product surface processing are also somewhat different. The same kind of bright paint, because of the material characteristics, different formulations, the gloss effect, wear resistance, etc. are also different. With matte coating, the surface of the printed product has almost no glossiness, but it has a certain sense of art. Some products have a matte coating and the process effect is no less than that of a bright coating. Whether it is light or matt coating, the coating must have good abrasion resistance in order to protect the surface of the print.
Oily glazing process features. With the oiling varnish of the printing machine, the gloss and abrasion resistance of the surface of the printing product are limited by the structure of the coating due to the thickness and drying of the coating coating, and the effect of the solvent-based or water-based coating on the optical machine is not as above. Therefore, this kind of glazing is generally only suitable for ordinary products with small batches and low quality requirements.
Solvent polishing process features. Solvent polishing products have high surface gloss and abrasion resistance, but because the diluent is an organic solvent.
Such as toluene, etc., with the volatilization of the solvent, the cost of the coating coating is also large. The solvent coating coating has poor resistance to physical properties and the coating tends to be yellowish. Moreover, the odor-rich solvent not only tends to pollute the environment, but also has a certain impact on the production safety. Therefore, the production site must pay attention to exhaust emissions, and the machine uses an electric heating tube. Drying, we must pay attention to maintaining the smooth transport of cardboard, cardboard to prevent skewing and blocking the drying of the road so as to touch the electric heating pipe, causing fire accidents.
Waterborne coating features. The waterborne coating has a colorless, odorless, non-toxic, non-irritating, coating drying speed, wear resistance, high temperature resistance, no yellowing, no discoloration, and has good transparency and high gloss, so the process is more suitable In the food packaging surface finishing processing. However, the solvent of water-based coating oil is water, and the printed product is prone to deformation after it is glazing. Its abrasion resistance is second only to the solvent glazing coating. If the outer layer of the cardboard is packaged with PVC plastic film, the surface of the PVC plastic film is likely to be sticky, and the glazing film and the graphic ink color of the printing material are easily damaged. Therefore, the outer packaging material is a PVC plastic film. The cardboard coating should not use water-based paint, but should use a solvent-based wear-resistant glazing paint for glazing.
UV coating process features. UV coating is the use of UV coating on the surface of the printed material, the surface of the film to form a high gloss. After the glazing film is irradiated with ultraviolet light, photopolymerization reaction and photocrosslinking reaction take place inside the coating layer, thereby rapidly solidifying and drying, so that no blocking quality failure occurs, and it is favorable for ensuring fast operation of subsequent processes. UV coating has the advantages of wear resistance, chemical resistance and chemical resistance, and good stability. Since UV varnish has no problem of solvent evaporation, unlike the solvent-based varnishing process, the environmental pollution caused by the solvent coating process is relatively small, and its production cost is far lower than that of the coating process. Therefore, it is an ideal process to replace plastic coating and solvent-based coating. However, in production, the problem that should be paid attention to is that the UV coating will have a certain stimulatory effect on the human skin. UV light will also cause certain damage to the human body. The coating will produce ozone after being dried by UV irradiation. The production site should have good Ventilation exhaust.
Second, paper packaging products on the coating requirements
In terms of product use and processing characteristics, glazing coatings must meet the basic requirements of safety, hygiene and environmental protection. Therefore, glazing oils have better flexibility, leveling, abrasion resistance, acid and alkali resistance, and adaptability. In addition, the varnish must have high transparency and non-discoloring properties, and its surface film layer should have good toughness so as to better protect the surface of the printed product and enhance the waterproof, moisture, dirt, and abrasion resistance of the product package. And other properties.
The calender process calendering on the cardboard surface is a deep processing process based on glazing. The production process is roughly as follows: the printed product is first polished with a polishing machine, and after the film is dried, it is hot-pressed with a calender to form a smoother and brighter mirror effect on the coating layer. This is a quality effect that can not be achieved by the general glazing process. Therefore, this production process is more used for surface finishing of preprinted corrugated cartons, cartons and other packaging products. Traditional calendering paints use toluene, cyclohexanone and other organic solvents as diluents. Not only is it easy to pollute the environment and endanger the health of the human body, but it also tends to cause pollution to the product and leave potential safety hazards for the packaging of the product. Therefore, it is not suitable for the packaging of food and medicine. From the perspective of packaging safety, non-toxic, odorless, non-polluting environment-friendly water-based calendering oils should be used.
The process of processing the wax on the surface of the paperboard through the wax process is simple and the operation is very easy to master. The process is to use a waxing machine to heat the melted paraffin liquid and evenly apply it to the paperboard or printed material. On the surface, when the paraffin coating on the paper is cooled, it is solidified to form a thin layer of very smooth waxy film, so that the paper surface has better waterproof, moisture, mold, dirt, rust, Oil and abrasion resistance, so this process is commonly used in the surface processing of food packaging, paper packaging and other non-moisture resistant products.
The spraying process of the paperboard surface uses a laminating machine to spray a layer of polyethylene or polypropylene with a thickness of 0.01mm to 0.07mm on the surface of the paperboard, so that the airtightness and the tensile strength of the paperboard are better improved. Makes the moisture-proof, waterproof, oil-proof and anti-dirty properties of the paperboard greatly improved. In recent years, with the continuous prosperity of the market economy, liquid beverages, solid frozen foods and other products have become more and more demanding for laminating paperboard, and the laminating technology has become more and more mature. According to the characteristics of the product, the processing of the coating of the paperboard has single-sided and double-sided. Double-sided laminating paperboard, printing quality control 4 points, if the process is not properly controlled, prone to imprinting bottom quality problems. That is to say. The ink is printed on the PE lamination film without absorption properties and it is easy to stick the back of the dirty product. Therefore, the use of non-drying device printing lithographic printing machine double-sided laminating paperboard, should use wear-resistant, strong adhesion, non-absorbent ink printing, in order to ensure product quality.
The surface coating process of the paperboard is a commonly used finishing process for preprinted paperboard, paper boxes, handbags, and covers. After being coated, the printed product can achieve waterproof, anti-fouling, anti-discoloration, heat-resistance, light resistance, and friction resistance. At the same time, it can enhance the glossiness, aesthetics, puncture strength, and tensile strength of the product and improve the use of the product. Life and packaging quality. The general process of laminating film is: After the product is printed, the laminating machine is used to combine the plastic film with the surface of the printed material to form an integral structure, forming a printed matter of paper and plastic. The coating process is divided into a coating film and a pre-coating film; there are also thermal and cold coating processes. Film-coated adhesives are also available in different types, both water-based and solvent-coated. Solvent coating film has a high brightness, but there is a problem of environmental pollution, and the solvent of water and tantalum coating adhesive is water, and there is almost no pollution to the product and the environment. Therefore, it is widely used for the surface finishing of food packaging. Because the coated products need to be classified for processing during recycling, the regeneration process is relatively complicated and the production cost is high. Some packaging products are being replaced by calendering or UV coating processes.
Third, the function of corrugated board production process
Functional corrugated cardboard is a new type of packaging material. Its difference from ordinary corrugated cardboard is that the original paper or carton is processed through special technical processes, which expands the function of the carton, and also improves and improves the quality of the carton. Increase the added value of products to meet the individual needs of product packaging.
From the perspective of logistics characteristics, product characteristics and market requirements, functional corrugated cardboard is an important production technology process for improving the quality of commodity packaging and effectively protecting commodities.
Waterproof corrugated board production process Waterproof corrugated board The main performance is that the board surface is impervious to water, but it cannot be immersed in water, otherwise it will start to permeate and break from the inner layer. Its main processing technology is: the curtain coating method is about to melt. The synthetic resin or paraffin mixture flows down from the hopper 13 as a film and is coated on horizontally running corrugated cardboard, after the surface of the cardboard is coated with a resin film or a wax film. That is, it has good water-blocking performance and abrasion resistance. This corrugated paperboard is mainly used for packaging pickled products, fruits and vegetables products and frozen foods, etc. Since the corrugated paperboard surface has a soft paraffin layer, so. Also suitable for packaging high abrasion quality furniture, high-end goods or industrial equipment.
Hydrophobic corrugated board manufacturing process Hydrophobic corrugated paperboard is also known as water-repellent corrugated paperboard. This kind of corrugated paperboard has high water repellency. When exposed to wet objects or when it is rained or splashed, the waterproof paperboard surface has certain water repellent properties. So that the water droplets do not soak into the cardboard fibers. Its processing technology is: first coating the cardboard processing and processing, such as the coating of Varnish, wax, silicone and other hydrophobic substances.
Before coating the varnish, it is best to apply a starch film layer on the surface of the cardboard first, and then apply the varnish after the film is dried. Silicone not only has good water repellency, but also has flame retardant, corrosion resistance, temperature resistance and other properties. Paraffin coating has a high degree of smoothness, wear resistance, water repellency is better. Adding appropriate amounts of water-resistant additives, such as polyvinyl butyral and melamine-formaldehyde resin, to the hydrophobic coating can improve the water resistance of the coating and can improve the water repellency of the corrugated paperboard surface. Therefore, the hydrophobic corrugated carton is suitable for packaging powdery substances that are easy to agglomerate after absorbing moisture, as well as refrigerated foods, which can better protect the product.
Water-resistant corrugated board production process Water-resistant corrugated board differs from water-repellent and hydrophobic corrugated board in that when it is soaked in water for a long time, its strength will not drop significantly. This kind of good performance and its processing Process characteristics related. This production process can use wax automatic paper feeder to continuously send the corrugated board into a paraffin wax bath at a temperature of about 90° C. After continuous dipping between 6 seconds and 12 seconds. According to the quantitative and different layers of corrugated board, it can be properly grasped. It is appropriate to use corrugated cardboard to penetrate corrugated board. After the corrugated board is saturated with the wax liquid, the corrugated board can be taken out of the wax tank and the excess wax liquid is removed, and then slowly moved in a hot drying room at about 10° C. to further uniformly penetrate the wax into the cardboard fibers. At the same time, the local excess wax is leveled. The wax-waxed corrugated cardboard after completion of the heat drying is forced to cool under normal temperature conditions to solidify the wax liquid. After paraffin wax processing, the corrugated board gets better water resistance. This carton is particularly suitable for holding live fresh seafood, frozen fruit and other products with high moisture content. There is also a water-resistant processing method for reinforcing paperboard by adding a water-resistant reinforcing agent directly to the papermaking pulp. The water resistance of the paperboard is improved, and at the same time, it is possible to better prevent powdering, hair loss and the like on the paperboard surface.
Preservation of corrugated board production process Preservation of corrugated board is the use of special processing technology, so that the cartons in the packaging of fresh fruits and vegetables. It can reduce the loss of water in the contents, inhibit the growth of bacteria, and absorb the bad gas inside the box. Make fruits and vegetables better preservation effect. General preservation corrugated board production methods are: sandwich molding, compound type, foaming type and mixed type, sandwich type is the plastic film after the antibacterial agent, preservatives soaked in corrugated cardboard, and then in The corrugated carton is coated with a preservative. This corrugated carton not only effectively prevents the evaporation of water, but also has the effect of regulating and controlling the temperature and keeps the goods in the box fresh. The composite type combines the aluminum-coated cling film with the inner surface of the corrugated carton, so that the cabinet has the function of absorbing ethylene gas, preventing moisture from evaporating, and at the same time reflecting radiant heat and preventing the temperature inside the cabinet from rising. And then play a role in preservation. Foaming is the combination of foamed plastic and corrugated board, which has better preservation effect than the former two methods. It is better in suppressing moisture evaporation, controlling thermal resistance and airtightness. The production process of mixed corrugated board is: adding porous type ethylene gas absorbing powder into paperboard or coating special paper powder that can emit infrared light with a certain wavelength on the base paper. Cardboard boxes made from this kind of cardboard can activate some of the molecules in fruits and vegetables. Enhance the function of resisting microbial erosion and improve the process effect of fresh-keeping packaging.
In summary, the paperboard surface treatment is an important technical means to increase the added value and quality of goods, improve the packaging quality and packaging quality of products, effectively prevent the damage of packaging and commodities, and enhance the market competitiveness of commodities. and so. Correctly understanding the production process and methods of cardboard surface technology processing, and selecting the proper packaging technology according to the characteristics of the commodity, will undoubtedly have a good promotion effect on improving the promotion of commodities and improving the economic benefits of the enterprise.
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