The base paper is the main material for making cartons, and it is also an important condition that affects the production efficiency and quality of cartons. Therefore, correctly understand and grasp the characteristics of the base paper and its impact on carton printing quality and carton strength, scientific and rational purchase of suitable base paper for production; according to the characteristics of the base paper, a reasonable arrangement of the production process, to effectively avoid product quality problems The occurrence of the carton and the improvement of the production efficiency of the carton are all of great significance.
The Effect of Paper Absorption on Printing Quality of Carton Products
The ink absorption of the base paper is a manifestation of the physical properties of paper and paperboard, and it refers to the ability of the base paper to absorb ink. Conversely, it is also the ability of the ink to penetrate the base paper. The penetration of the ink into the base paper needs to be achieved under specific process conditions. Therefore, the basic conditions of contact and pressure are needed between them. Obviously, the gloss of the base paper is good, the ink absorption is poor, the drying speed of the imprinting is slow, and the unfavorable conditions such as the bottoming of the imprinting easily occur. The strong ink-absorbing base paper has a relatively loose surface fiber structure, a poor glossiness, and the ink color of the printed product is also prone to blooming, and it is easy to reduce the printing durability of the printing plate. After the ink is transferred from the surface of the plate or blanket to the surface of the paper, a portion of the ink, particularly the binder in the ink, will penetrate the fibrous tissue of the base paper.
At the same time, the solvent in the binder began to evaporate. In addition, the main part of the binder material undergoes chemical reactions and physical reactions, so that the ink film on the surface of the print product gradually increases in viscosity and hardness, and a solid film layer is formed. This is the general drying process after ink transfer. The ink absorbability of the base paper directly affects the printing effect of the product. Insufficient ink absorption of the base paper will cause too much of the link material in the ink to permeate into the paper fibers, resulting in excessive reduction of the oil content in the ink layer, so that the pigment particles are bound to be suspended on the surface of the paper and the ink layer is dried. After the prints lack luster, some of the prints even rub slightly, and the paint will fall off. This is the phenomenon of imprinting. If the original paper fiber structure is too loose, the ink absorption is too strong, the ink pigment particles infiltrate into the paper together with the binder, affect the thickness of the ink layer conjunctiva, so that the print can not be rendered on the paper with the color saturation, affect the visual effect of ink . The ink absorption ability of the base paper also has a great influence on the drying speed of the printing ink layer. This is because when the base paper whose ink absorption is too small is used for printing, the ink layer is fixed and dried slowly, and the product is liable to make the product sticky and dirty. Happening.
The influence of variety and standard of base paper on the quality of carton products
The cartons with different structures and different materials are quite different in price, and the price has a great relationship with the grade and quality grade of the base paper. The production of cartons is based on the use of carton characteristics and transport conditions to determine the type and quality of the paper, which is to maintain proper packaging, control of production costs, a key link. The base papers for making cartons mainly include white paperboard, corrugated paper, tea board paper, ordinary boxboard, and kraft noodle boxboard. The manufacturing processes and materials of these base papers are different, and the standards are also different. There are two kinds of coated white paperboard, white and gray, quality grade and other excellent products, first-class products and qualified products. White cardboard is the material used for preprinted carton face paper. The quality of white paperboard has a great influence on the printing and strength of the carton. White board moisture, printing surface roughness, smoothness and surface strength are more sensitive to the impact of print quality, moisture also has a certain influence on the printing plate surface registration, and printing surface roughness, smoothness and surface strength indicators on the printing The influence of quality is greater, such as whether the printing ink layer can be saturated or whether the delamination and blistering problems occur after printing on the paper surface. The lateral stiffness of the whiteboard affects the compressive strength of the carton; the tightness of the whiteboard is not as high as possible, but is specified to be no more than a standard value, such as superior products (quantitative ≤300g) not more than 0.88g/cm3. Because if the tightness of the white cardboard is too high, the folding endurance of the carton flap will be significantly reduced, and the flap may be easily broken during use. Corrugated paper is mostly used in the corrugated layer of the carton, and it is also used in the corrugated board sandwich layer or the inner layer. Corrugated paper for corrugated layers, how its quality directly affects the compressive strength of the carton. The corrugated paper grades A, B, C, and D are four grades, and A and other quality indicators are the highest. The routine inspection items include moisture, quantitative, tightness, lateral cyclic pressure index, and fracture length, among which the lateral pressure index, Quantitative and tightness indexes have a great influence on the side pressure strength of corrugated cardboard. Boxboard paper is generally used for carton paper or paper, and its quality has a great influence on the strength of the carton. Ordinary linerboard and kraft noodle boxboard are divided into three categories: excellent products, first-class products and qualified products. Their standards are moisture, quantitative, tightness, lateral pressure index, breaking index, positive and negative surface water absorption, horizontal folding degree, etc., among them, the lateral ring pressure index, the burst resistance index and the quantitative resistance to the corrugated board, Puncture strength and side pressure strength have a significant effect. Therefore, the author believes that the base paper, as the source of the carton quality, must pay attention to strict and effective control. The main methods are as follows: During the procurement, the requirements of the varieties, quality levels and standard items for the procurement of the original paper shall be specified in the contract. The inspection items and standard values ​​may refer to the relevant national standard, and may also be agreed by the supply and demand sides. The standards and inspection items of the base paper shall be determined according to the characteristics of the product. For example, the degree of sizing may be increased for corrugated paper and cardboard, because if the surface of the base paper is good, the base paper will not absorb moisture and the adhesive will absorb when the adhesive is applied. The corresponding amount is also small, which is conducive to the drying of cardboard and improve the strength of the carton. In addition, it is the acceptance of the purchased base paper that is to be tested according to the standard and according to the provisions of the contract, which is an important part of ensuring the quality of procurement.
Reasonably arrange the printing process according to the characteristics of different base papers
According to the characteristics of the use of the carton, the product's transport conditions, the customer's business ideas and cost control methods, etc., to determine the quality characteristics of the selected base paper. Some low-end, low-margin products only require the use of low-grade base paper, so as to reduce production costs and allow production to have a certain margin of profit, but it is also easy to add a certain degree of difficulty to production. If the quality of the low-grade white paperboard surface is poor, blue-green, green flat-net or full-field printing will easily lead to spotted variegation. That is, the lightly-coated local paper will clearly perceive the fibrous structure of the pulp, affecting printing. Ink uniformity. In this regard, the excess color group can be used to arrange the first diluting agent in the first group of the printing machine, and then printing on the surface of the diluting agent, so that the diluting agent can cover the partial exposed bottom of the surface of the white cardboard, and can also increase the printing ink layer. Gloss, the amount of ink applied will also be reduced accordingly. White cardboard with poor surface strength is prone to paper flaking, blistering or delamination defects during the printing process, which not only affects the printing efficiency but also affects the printing quality. In this regard, the solution to the first one is to properly adjust the viscosity of the ink, use adhesives to adjust the viscosity of the ink; second is to adjust the appropriate printing pressure, printing pressure to minimize the printing pressure, reduce the pressure on the paper surface strength damage The third is to properly reduce the speed of the machine to print, reduce the force of the printing ink peel force on the paper surface; Fourth, a reasonable arrangement of printing color sequence, printing should try to print a small layout after the first large-scale printing, first printing low viscosity ink Post-printing ink with high viscosity; Fifth, air stamping the printed sheet, using the extra color group, first imprinting or “overwatering†the printed sheet; and sixthly, adjusting and printing the white cardboard with poor printing surface strength. For example, flexo ink has a lower viscosity than offset and embossed inks. It can be adjusted by flexo printing, or it can be adjusted for products with small printing area. Through this process arrangement, the cardboard can be better prevented from falling. Foaming or delamination.
Reasonable arrangement of corrugated board processing technology according to the characteristics of the base paper
Different raw material properties, the impact on the production efficiency and quality of the carton production line, in the daily process is also more prominent, such as corrugated production line with unreasonable, easy to cause the corrugated board curl strength decreased; corrugated layer of raw paper quality is not good, then affect The compressive strength of the carton; hard, uneven surface paper, corrugated cardboard, easy to appear after the degumming, foaming and other quality problems, consumption will increase significantly. Generally, corrugated cardboard is composed of cardboard and corrugated paper. If there is a great disparity between the moisture content of the paper and the paper, the paper will undergo significant changes in the expansion and contraction of the adhesive after it is absorbed and heated. The difference, it is easy to cause the cardboard curl, so that the strength of the carton. Therefore, the rational distribution of paper is very important, the original paper on the machine should be tested before the moisture content, relatively close to the moisture content of the linerboard and corrugated paper matching forming, in order to prevent and reduce the opportunity for cardboard curl. The quality of the corrugated base paper has an impact on the overall compressive strength of the carton, and it has a greater impact on the compressive strength of the carton than the paper and paper. Therefore, a corrugated paper or cardboard with a high ring pressure index is selected as the corrugated layer. Paper is a problem worthy of attention in the control of production processes. For the production of outer packaging cartons for long-distance transportation, high-end and explosive goods, it is better to use high-strength corrugated paper or cardboard as corrugated paper, which can greatly improve the compressive strength of the cartons and better protect the goods. In addition, when the preprinted paper is affixed, when the paper is hard and the flatness is not good, if the affixing is performed on a manually operated gluing machine, blistering and degumming quality problems are likely to occur. According to past production experience, it is appropriate to place the calendered tissue paper on the automatic laminating machine, because the pressurizing device of this machine is conducive to ensuring the smoothness and firmness of the frieze and can better ensure the processing of the cardboard. quality.
Do a good job of quality control and proper storage of the base paper
The production process and materials of the base paper determine the quality standards of the base paper. The procurement of base paper is not only the purchase of varieties and quantities, but the quality of the original paper and the standard for buying the base paper. The quality standards of the same type of base paper of the same manufacturer are different. Therefore, inspection and control is a very important link. It not only relates to the quality and consumption of production, but also relates to the cost and profit of production. In the paper acceptance inspection practice, the author found that a considerable part of the original paper, can not meet the quality requirements of custom standards, can only reduce the price processing and degraded use. That is to say, if the quality standard of the inspection base paper is lower than the contractual standard, each ton can be received at an appropriate price reduction and used for the production of cartons of a lower grade, so that the quality standard of the grade of the cartons will not be affected, and the return to the manufacturer can also be avoided. Concern and transport losses. Therefore, the carton professional factory must establish a laboratory to purchase some equipment to detect the important indicators of the base paper, so that it can be classified and used according to the actual quality of the base paper, maintain the appropriateness of the packaging, and avoid blindness on the paper to ensure the carton The effectiveness of quality control. In addition, proper storage of the base paper is also an important part of ensuring product quality and stability. Relatively speaking, the standard value of the base paper is not always constant, and it has been found in many tests that some quality indicators will change after some base paper is stored for a period of time. This has a certain relationship with the original paper storage time and storage conditions. 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 a good job of stocking and keeping the base paper. When the base paper is stacked, the height of the wood frame should be used, and the distance from the ground should be greater than 25cm, and the wall should not be too close and the spacing should not be less than 40cm. The place where the original paper is piled must be kept clean and dry, and it must be well ventilated. Do not blindly stack the base paper in a damp place. The warehouse temperature for storing the base paper should be controlled between 20°C and 25°C. The relative humidity of the environment should be able to be controlled between 60% and 70%. If the temperature of the paper warehouse reaches 38°C, ventilation cooling measures should be taken to prevent the base paper from being damaged. Due to sultry and brittle deterioration. When the base paper is used, it should pay attention to the advanced use. If the moisture content of the base paper is too high, it can be put into use after being stored for a long time, which is beneficial to the loss of moisture and improve the processing quality of the paperboard.
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