Abstract: The base material of beer cartons is base paper. The base paper includes corrugated paper, boxboard paper, white paperboard, etc. They are very sensitive to moisture and are most likely to produce moisture absorption in a humid environment. Once the beer carton is damp, its strength will be greatly reduced, affecting the normal circulation and packaging quality of the product. Therefore, we must pay attention to effective control from the source of production, through the check of raw materials and production technology to improve the moisture resistance of beer cartons.
Keywords: beer box, base paper, carton moisture-proof process
Recently, a customer inquired about how to solve the problem of dampness of the carton. Based on the author's work experience and knowledge in the carton factory and printing factory for the past 28 years, I will talk about the following opinions and methods for reference.
The base material of beer cartons is base paper, which includes corrugated paper, boxboard paper, white cardboard, etc. They are very sensitive to moisture, and are most likely to produce moisture absorption in a humid environment. Once the beer carton is damp, its strength will be greatly reduced, affecting the normal circulation and packaging quality of the product. To this end, the method of machine drying, sun drying and wind blowing can be used to remove the moisture. Of course, it is important to pay attention to the effective control of the carton moisture from the source of production. Through the control of raw materials and production process technology, the moisture resistance of beer cartons is improved. This is a link worth paying attention to in the production process.
Correct understanding of the effect of base paper quality on moisture resistance of carton
The quality of the cardboard and corrugated paper directly affects the moisture resistance of the carton. Among them, the level of the base paper's tightness, sizing degree, water absorption on the front and back sides and other indicators have a great influence on the moisture resistance of the base paper. While the base paper has good tightness and sizing degree, its water absorption index is low, and its moisture resistance is good. Through inspection and comparative analysis in the practice of production technology, we found that if the tightness and sizing degree of the cardboard and corrugated paper are poor, the strength of the corrugated cardboard produced by the production is correspondingly poor. This is because the fibrous structure of the base paper with poor tightness is loose, and it is easy to absorb moisture in the external environment (including the steam emitted by the single-sided machine). On the other hand, the sizing degree of the base paper is poor, and the paper surface is also easy to absorb moisture in the external environment. Therefore, according to the actual situation of the production process, it is very important to control the quality of the base paper. The current national standard corrugated paper does not have the sizing degree and the front and back water absorption inspection items. The boxboard paper only has the front and back water absorption inspection items. The coverage of the quality control of the base paper still has certain limitations. In response to this, we have formulated enterprise standards for corrugated paper and cardboard based on the actual quality of the production. We have adopted quick and simple methods to quickly detect the sizing degree and water absorption index of the base paper. The method is to randomly extract a piece of roll paper , Drop water droplets on the paper surface, and observe the bleeding speed of the water droplets on the paper surface, the standard unit is ≥60S. All the base papers that fail to meet the inspection standards will be returned for processing. By adopting such control measures, the quality of the base paper has been improved and the moisture resistance of the carton has been significantly improved. In addition, due to the different quality levels of cardboard and corrugated paper, there are certain differences in technical indicators. Therefore, it is best to select high-quality raw paper for the carton of high-end beer packaging, which is also an important process to improve the moisture resistance of pre-printed beer carton Measures.
The relationship between the technical index of whiteboard paper and the moisture-proof performance and the principle of reasonable use
Normally, the surface paper of the pre-printed beer carton is whiteboard paper, which is the outermost layer of the corrugated carton when it is mounted, so it is also the easiest to contact with the outside air moisture. Therefore, some technical indicators of whiteboard paper also directly affect the entire carton Moisture resistance. According to the experience of the production process, the author believes that the printed surface roughness, smoothness, gloss and water absorption of whiteboard paper have a greater impact on the moisture resistance of the carton. Therefore, when ordering, it must be emphasized that these technical indicators should be controlled within the scope of the national standard. Even higher than national standards can be required to improve the moisture resistance of the carton. Especially for post-press processing of whiteboard paper with a glazing process, the poor quality of the paper surface is easy to absorb oil, so that the paper surface lacks the proper oil layer and brightness, and it is easy to absorb external moisture.
According to the national standard GB / T10335.4-2004 "Coated Whiteboard Paper" regulations and technical requirements, coated whiteboard paper is divided into three types: first-class products, first-class products and qualified products, and there are white background and gray background, and There are certain differences in technical indicators. We have found in the practice of production technology that high-quality whiteboard paper has higher brightness on the paper surface after glazing. On the contrary, it obviously lacks brightness and its moisture resistance is also poor. Therefore, according to the different quality grades of the products and the difference in the temperature and humidity of the sales area, choose the appropriate grade of whiteboard paper for printing, which can take into account the economics of moderate packaging, and can better achieve moisture-proof packaging and meet the quality requirements of market use. . According to the author's experience in quality control, the principles for selecting the quality grade of preprinted whiteboard paper are: general product grade; short sales and service cycle; relatively dry environment for product sales and use; relatively large area of ​​ink coating on carton printing plate For preprinted whiteboard paper, you can choose first-class or qualified products for printing as appropriate. Conversely, the product grade is higher; the sales and use period is longer; the environmental humidity of product sales and use is relatively high; the printing ink surface area is not large, you can use premium whiteboard paper for printing, which is also to improve the Important technological measures for moisture resistance of printed paper boxes.
Improve the moisture resistance of pre-printed beer cartons through post-printing process control
The moisture absorption caused by the external factors of the beer carton mentioned above starts with the outermost preprinted facial paper of the carton. Then, the preprinted whiteboard paper is controlled by the technical specifications of the base paper and the printing layout design (the printing ink coating area is large Yes, its hygroscopicity is low), to achieve improved carton moisture resistance, its effect is limited after all. To achieve durability, wear resistance and better moisture resistance, it can be achieved by using the processing technology of film coating, glazing and calendering. Among them, the lamination process has the best effect, but the production cost is higher, the packaging cost is increased, and the material recycling causes greater difficulties and troubles. This process is only suitable for high-end products and long-distance transportation product packaging . The glazed and calendered facial paper is a more commonly used processing technology. Its moisture-proof and anti-friction effects rely on glazing paint, commonly known as glazing oil, and its production process is relatively simple and economical. Through glazing and calendering, a bright and smooth protective layer can be formed on the surface of whiteboard paper. Generally, the packaging of mid-range beer and other products uses calendering or glazing technology. Therefore, according to the characteristics of the product, choose the appropriate post-press processing technology, so that the moisture-proof effect and appearance quality of the product packaging are better taken into account.
Do the proper storage of the original paper
Both the production process and theoretical analysis show that the quality of the base paper is a factor that has a prominent influence on the production efficiency and product quality in carton production. It is particularly important to do quality control and correct storage of the base paper. Proper storage of the original paper is also a non-negligible link to ensure stable product quality. Relatively speaking, the standard value of base paper is not constant. In many testing experiments, we have found that some base papers will have some changes in quality after some time in stock. This has a certain relationship with the storage time and storage conditions of the original paper. Because the base paper has strong moisture absorption characteristics, it is very sensitive to air humidity. When the base paper is damp, the moisture will increase significantly. Therefore, it is very important to do the stocking and storage of the base paper. From the perspective of moisture resistance, when stacking the base paper, the height of the wooden frame should be used. The distance from the ground should be greater than 25cm, and should not be too close to the wall. Therefore, the place where the base paper is stored must be kept clean and dry, and well ventilated, and the base paper must not be blindly stacked in a damp place. The temperature of the warehouse where the base paper is stored should be controlled between 20 ° C and 25 ° C, and the relative humidity of the environment should be about 60%. When using the base paper, it should be paid attention to the advanced use first. If the moisture content of the base paper is too high, it can be placed for a longer time before being put into use, which is conducive to the loss of moisture and improves the processing quality of the paperboard.
Polishing process of preprinted beer carton facial paper
Glazing is a common process of post-printing processing of packaging products. After the surface of the product is coated by glazing, the printed products can be enhanced in water resistance, light resistance, friction resistance and pollution resistance. At the same time, the surface brightness of the product can also be improved, so that The grade of the product has been greatly improved. Varnishes have a variety of structures. They are useful for oily varnishes varnished by printing presses, water-based and oily varnishes varnished by varnishers, as well as solvent-based varnishes and UV varnishes. The characteristics of glazing coatings are different, and the technological effects of product surface processing are also different. The same is the gloss coating, because of different material properties and formulas, its gloss effect and wear resistance are also different. When coated with matte paint, the surface of the printed product has almost no glossiness, but it has a certain artistic sense. Some products have matt paint, and the process effect is no less than that of bright paint. Regardless of whether it is bright or matt paint, the coating must have good water resistance and wear resistance to protect the surface of the printed product.
UV glazing technology for preprinted beer carton facial paper
UV varnish is also called ultraviolet varnish or curing varnish. The main component of UV varnish is composed of photosensitive resin, reactive diluent, photoinitiator and additives. Its principle is: under ultraviolet irradiation of a certain wavelength, within the system The free radical of the photoinitiator initiates the unsaturated double bond in the resin, and the key-lock polymerization reaction occurs rapidly, so that the cross-linked junction film is cured. Since China's accession to the WTO, the call for green environmental protection has also increased day by day, so UV glazing has been widely valued for its excellent glazing effect and non-toxic and non-polluting characteristics. Among them, water-soluble UV varnish is a process improvement based on the original UV varnish, which overcomes the irritating defects of traditional UV varnish. The product has the advantages of strong gloss, no fading, no discoloration, fast drying, stable paper size, non-toxic after drying, which is beneficial to environmental protection and is suitable for post-press processing of food packaging. The color printing facial paper after water-based UV glazing can enhance the light resistance of the surface ink layer, improve the heat and moisture resistance of the facial paper, and play a good role in protecting the product.
Calendering process of preprinted beer carton facial paper
Calendering is also called a polishing process. Its main production process is: first use a glazing machine to apply the polishing coating evenly on the surface of whiteboard paper. When the printed surface coating is dry, pass the printed product through the calender After the hot pressing of the stainless steel belt on the hot roller, after cooling and peeling, the surface of the facial paper forms a high-gloss mirror effect, which can increase the surface finishing effect of the product, improve the protection performance of the product, and print the ink layer on the surface To achieve the effect of brightness, wear resistance and moisture resistance, the grade of the product can also be improved to a certain extent. Therefore, the calendering process has been more and more widely used in the post-press decoration process of beer outer packaging.
Laminating process of preprinted beer carton facial paper
Laminating is a commonly used finishing process for preprinted carton facial paper. After the printed product passes through the film, it can achieve the properties of waterproof, antifouling, anti-fading, heat resistance, light resistance, friction resistance, etc. At the same time, it can enhance the gloss, aesthetics, piercing strength and tensile strength of the product, and improve the use of the product. Lifespan and packaging quality. The general process of laminating is: After the product is printed, the plastic film is combined with the surface of the printed matter into a whole structure with a laminating machine to form a paper and plastic printed matter. The coating process is divided into coating film and pre-coating film; there are also differences between hot coating and cold coating. There are different types of adhesives for coating, including water-based coating adhesives and solvent-based coating adhesives. Solvent film adhesives have high brightness, but there is a problem of environmental pollution. The solvent of water-based film adhesives is water, which has little pollution to products and the environment. Therefore, it is widely used in the finishing of packaging surfaces such as beer and soy sauce. Because the laminated products need to be sorted and processed during recycling, the regeneration process is relatively complicated and the production cost is high. Some packaging products are being replaced by calendering or UV glazing processes.
Achieve moisture resistance through reasonable design of the carton forming process
In the past, when the beer boxes we produced were used in a beer factory, such a situation occurred: after beer filling and packaging, when the finished products were transported online or stacked in the warehouse, some cartons of the carton showed moisture permeability, the reason is : The beer just filled has a certain temperature, and a certain amount of hot steam formed in the box cannot be quickly emitted after packing, so the hot steam is immediately absorbed by the paper in the carton (board paper) and penetrates into the corrugated paper until the outermost layer White paper. After moisture absorption occurred in the carton body part, deformation and compressive strength decreased rapidly, which affected the quality of the packaging. Through quality tracking and analysis, we found that cartons with the same paper quality did not appear in other breweries. This shows that the environment and process characteristics of beer production lines are different, and it also affects the difference in moisture resistance of cartons. In response to these circumstances, we have adopted corresponding process countermeasures according to local conditions, and achieved a good moisture-proof effect by reasonably designing the carton molding process. The method is: when making the die-cutting plate, design two side holes (diameter 18mm) at the appropriate positions on the side marks (ie the two sides of the side) of the beer box, and the outer diameter distance of these four holes The indentation line and side indentation line of the shaking cover are 40mm and 3.5mm respectively. In this way, after online brewing and packaging of the brewery, the four vent holes on the carton can quickly discharge the hot steam in the box to form air Convection phenomenon can effectively avoid the phenomenon of moisture absorption and moisture permeability in the carton box. By adopting such process improvement, the beer boxes produced by us have been tested and used in brewery online packaging, and a good moisture-proof use effect has been achieved, and customers have also accepted this improved process with satisfaction.
Proper storage of beer carton stock
Regardless of the quality of the base paper of the beer carton, and what kind of post-press decoration and protection process is used, its moisture-proof protection performance is limited. Therefore, the carton factory or the brewery. After the production and storage of the carton products, we should pay attention to the storage of moisture-proof stocks. The warehouse should maintain good ventilation and drying conditions, and the temperature should be controlled at 20 ℃ ~ 25 ℃. Between is appropriate. The finished carton should not be stacked directly on the ground, but should be piled up with a pad to prevent moisture absorption and greatly reduce the strength of the carton. Cartons are not afraid of trouble when they are used out of the warehouse. It takes more time to turn over the cartons that have been put in the warehouse and use them first to prevent the cartons from being stacked for a long time and causing moisture deformation to affect the quality.
In summary, to improve the moisture resistance of beer cartons, it is necessary to control the quality of the base paper and the rational design of the production process. From the raw materials of the product quality, the production process and the production process, through the strict control of production technology and operation technology Control can not only improve the moisture resistance of beer carton, but also effectively improve the overall quality of beer carton products, so that moderate packaging can better meet the requirements of different users and different market environments. This is also the quality of the carton industry. The goal of control.
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