Several technological control of paper container post-press processing

With the continuous development of the commodity economy, color corrugated boxes and cartons are used as paper containers for product outer packaging, which are used by more and more businesses, and the quality of post-press processing is also valued by people. Because the quality of post-press processing of color boxes and color boxes not only affects the effect of product packaging, but also determines the market image of the product, so we pay attention to the technical control of the quality of post-press processing of color boxes and color boxes. It is of great significance to improve the packaging performance of products, effectively protect products and promote product sales.

1 Do a good job of technical control of film quality

Laminating is a common process to improve the performance and decorative effects of color cartons and cartons. How the quality of the laminating directly affects the performance and image of the product packaging. Therefore, no matter from the perspective of product packaging or protection, the film is firmly bonded to the paper, the surface is clean, flat, and smooth; no wrinkles, blisters and powder foil marks; the degree of drying after coating is appropriate, no Sticking the surface film or paper surface is the basic requirement for the quality control of the film. In addition to paying attention to controlling pressure, temperature, speed and glue application amount in the laminating process, we must also pay attention to the technical control of the quality source, that is, we must pay attention to the control of paper and printing quality, that is, control the paper moisture, so that It achieves a good balance with the printing environment to ensure the smoothness of the paper surface and prevent the paper from being deformed after being coated. At the same time, it is necessary to control the thickness of the printing ink layer and the dryness of the ink layer. Any printing product that can be used without powder spraying should try not to use powder spraying. If it needs to spray powder, it should be printed with as thin and uniform powder as possible. It is best not to add auxiliary materials to the ink used in the printed matter of the film, which is also the basis for ensuring the quality of the film. In addition to controlling the production process technology, attention should be paid to inspection and control during the lamination process. During the inspection, you can take a film sample of the appropriate area and rub it with your hands several times to see if the plastic film and the printed sheet are separated or blistered. If the adhesion is firm and there is no film peeling or blistering, it means that the product is filmed. The quality is relatively reliable. The tearing method can also be used for testing, that is, the plastic film layer on the film sample is peeled off and peeled off by hand to see if the printing ink layer or paper fiber is attached to the film layer on a large area. The control is normal. Through sampling inspection, the occurrence of unqualified products can be avoided, and the product quality and production efficiency can be simultaneously improved.

2 Do technical control of coating quality

Most of the pre-printed carton and color box products now use a glazing process to achieve the surface effect of finishing products and protecting products in order to improve the gloss of the product surface and improve the quality of the product. In order to ensure the glazing quality, we must pay attention to the technical control of the production process. First of all, when choosing the varnish, it is necessary to pay attention to its compatibility with the characteristics of the printed matter. For color box and color box products with large printed graphics and large ink volume and large powder spraying amount during printing, it is best to choose a large viscosity 3. The varnish with strong covering power can better avoid mottling after glazing. Secondly, the choice of varnish should be purchased according to the production characteristics of the equipment, otherwise it will directly affect the quality effect and production efficiency of the product. For example, the solvent-based varnish is only suitable for production on ordinary varnishing machines, while the UV-curable varnish must be used on a varnishing machine equipped with an ultraviolet drying device, so that the varnish layer can be cured and dried. . For water-based or alcohol-soluble glazing oil, the length of the conveying drying tunnel of the glazing machine should be more than 6m, and the temperature of the drying tunnel must be above 60 ℃, so that the printed products can meet the drying requirements after glazing and avoid the stacking of printed products Blocking occurred during the process. A glazing machine with a shorter drying channel and a faster speed requires that the curing and drying speed of the glazing oil be correspondingly faster to prevent the product from sticking during the glazing process. Third, when using varnish, pay attention to stirring evenly, because the molecular weight of each material component in the varnish is different, which is prone to precipitation. The precipitated glazing oil will inevitably affect the quality effect of the product glazing. Therefore, in the production process, it is necessary to pay attention to frequently stirring the glazing oil to improve the glazing quality of the product. Fourth, when using the new type or different manufacturers of the same type of glazing oil, you must first conduct small batch test production, and then according to the quality effect and experience of the product glazing, determine a more scientific and reasonable deployment plan to prevent product glazing. The occurrence of light quality problems ensures the stability of the quality of the batch of products. In addition, you should pay attention to the shelf life of the glazing oil. Generally, the shelf life of the glazing oil is 6-9 months. If the glazing oil passes the shelf life, it will be prone to deterioration and affect the normal use and glazing quality. When using it, it should be noted that advanced varnish must be used first, and pay attention to the identification and production records to prevent the varnish from being out of date.

3 Do a good job of technical control of calendering quality

Calendering is based on the product first coated with a layer of polishing oil, using the effect of the temperature and pressure of the calender to change the surface state of the glazed coating after drying to achieve a high-gloss mirror finish. And the product to form a uniform and high-brightness quality effect mainly depends on the concentration of the polishing oil, the thickness of the coating layer, the calendering temperature, the pressure and the machine production speed. If the concentration of the polishing oil is low or the coating layer is thin, during the calendering process, it is easy for the facial paper and the steel belt to stick together. Therefore, in addition to referring to the formula recommended by the manufacturer, the most important thing for the polished oil concentration is to reasonably master the proper ratio according to the characteristics of your own production equipment and printed products. For the coating thickness of the polishing oil, it is appropriate that the surface gloss of the product is significantly improved after the product is polished. This control usually depends on the operator's production experience and technical proficiency. If there are qualified factories, the gloss meter can be used for detection and control, and the reliability of quality control is more accurate. The calendering temperature is generally controlled at about 100 ℃, the pressure is controlled at 90KN / m ~ 110KN / m, and the speed of the machine is about 8m / min. However, in the actual production operation process, we should also pay attention to the synthesis of various production conditions. According to the characteristics of the printed products, the characteristics of the base paper material, the temperature and humidity of the production environment, etc., we summarize the different production conditions and use different calendering temperature processes. In order to better avoid the failure of the adhesive paper of the calender belt. If the author has found in the production process quality tracking in the past, when the temperature of the 250g / m2 pre-printed facial paper product is set to 130 ° C, the failure of the adhesive paper of the calender belt can be better avoided, and the calendering The quality effect is also relatively stable.

4 Do a good job of technical control of hot stamping quality

Process practice shows that printing quality is the source of hot stamping quality. To control the quality of hot stamping, we must first control the printing quality. For the process of hot stamping a layer of anodized aluminum film on the ink color of the printed matter, the thickness, adhesion and drying performance of the ink layer directly affect the quality effect of hot stamping. I have found in the actual printing production process in the past, when printing the base color ink, if the amount of desiccant is too large, it is easy to cause the crystallization of the ink layer of the printed product, causing the anodized aluminum to be hot-pressed or even hot-pressed. In addition, in the adjustment of ink, if excessive glazing paste, debonding agent, ink adjustment oil, anti-drying oil, anti-sticking agent, etc., and the amount of printing ink is applied too much, it is easy to cause hot stamping or pull off the bottom Color ink layer phenomenon. Therefore, hot stamping products should pay attention to control the ink mixing process and inking operation technology, try not to use or use fewer auxiliary materials, and try to use fast fixing, quick drying, high quality ink suitable for hot stamping for printing, and Control the proper printing ink layer thickness. In the hot stamping process technology control, we must pay attention to the control of moderate pressure to avoid bad paste, burrs, embossing, poor adhesion of the ink layer, or the hot stamping surface appears flower, untrue and other undesirable conditions. In the hot stamping temperature control, pay attention to the larger hot stamping area, the electric heating temperature is relatively higher; on the contrary, the electric heating temperature is lower, the specific situation should depend on the actual temperature of the printing plate on the hot plate and the temperature that the aluminum foil can withstand It depends. If the hot stamping is performed at an excessively high temperature, it is easy to melt the hot-melt film layer over a wide range to produce a paste phenomenon, and it is prone to quality problems such as fog spots, poor brightness, blistering, and oxidation and discoloration of the surface of the dyed layer. Due to the different characteristics of anodized aluminum materials and hot stamping materials, the temperature required for hot stamping is also significantly different, some can be hot stamped as long as the temperature of about 80 ℃, and some require 180 ℃ or even 200 ℃ to hot stamp. But in any case, the temperature of hot stamping must melt the adhesive layer of anodized aluminum to complete the intact and uniform transfer of the aluminum foil film layer. After the optimal hot stamping temperature is determined, hot stamping should be carried out continuously during the production process to avoid downtime as much as possible to keep the temperature and machine speed constant and ensure the stability of the hot stamping quality. [next]

5 Do a good job of technical control of mounting quality

The mounting process is an indispensable process for the production of preprinted cartons. The links that affect the quality of mounting products are mainly the quality of adhesives and production technology. Such as the viscosity of the glue, fluidity, coating amount and the degree of mastery of production technology. Therefore, the production process should first pay attention to the inspection and control of the viscosity of the glue, because once the glue fails, it will cause a large number of defective products or waste products. Therefore, every batch of adhesives must be tested and confirmed before trial production. Even if the viscosity test of the adhesive is qualified, it is necessary to check and confirm the actual samples produced at the production site. This is the most accurate and effective inspection method. The method is as follows: the semi-finished cardboard after trial mounting is inspected by the "tearing method", that is, the tissue is torn off from the corrugated paper, and the quality of the cardboard bonding is observed, from which the viscosity of the glue, Whether the thickness, uniformity and the gap between the roller and the roller of the mounting machine are appropriate, and whether the adjustment of other parts of the machine has reached a more appropriate level. For facial paper with high basis weight, large thickness, and poor flatness, it is best to arrange it on the automatic laminating machine for mounting, because of the structural advantages of the machine and the high viscosity of the glue used, it can better guarantee facial paper and corrugated cardboard The mounting of plain clothes makes the adhesion of the cardboard firm, which can effectively prevent the occurrence of quality problems such as foaming, false glue, and degumming, and ensure the mounting quality of corrugated cardboard.

6 Do a good job in the technical control of the quality of die cutting and indentation

Die-cutting is an indispensable procedure for post-press forming processing of carton and carton. How its process directly affects the appearance quality and performance of the finished product. Therefore, in order to ensure the quality of die-cutting products, we must pay attention to the inspection and control of die-cutting steel knives. For the quality inspection of die-cutting steel knives, there is currently no standard inspection method and equipment in this area. According to the author's knowledge and experience of die-cutting production technology, the inspection of the appearance of die-cutting steel knives is based on experience. The second is to use simple precision measuring tools for inspection; the third is to use the precision platform on the machine for inspection; the fourth is to use a manual swing steel knife to check its "steelness". Observation with the naked eye is mainly to observe the gloss of the blade of the die-cut steel knife, such as whether there are roughness, curve and unequal defects in the blade edge; whether the color of the blade body is uniform and uniform, and whether there are destructive mechanical marks and other undesirable phenomena. The thickness and height of the die-cutting steel knife can be measured with a vernier caliper, which can measure different parts separately to check whether the thickness and height of each detection point are within the standard range. In order to accurately check whether the thickness of the entire steel knife is even and uniform, you can apply some lubricating oil to the inner surface of the vernier caliper, then immediately clamp the blade body on the side of the steel knife to no gap, tighten the screws on the movable part of the vernier, and Gently pull the vernier ruler. If the vernier ruler moves smoothly on both sides of the blade body of the steel knife, it will always be smooth and there is no feeling of slack, indicating that the thickness of the steel knife is relatively uniform and its accuracy is high. Whether the height of the steel knife is even and consistent, you can use the precision platform of a paper cutter or other machines to contact the peak of the steel knife and the bottom of the knife with the platform surface of the machine, and then observe whether the entire strip is in precise contact with the platform surface. Can check the precision of the height of the steel knife. To check the "steelness" of the steel knife, you can use both hands to clamp the two ends of the steel knife, and then close your hands along the center of the steel knife to bend the middle part of the steel knife into a certain arc. After releasing your hands, the steel knife should be restored Straight, placing the blade body on the platform can fully reach the platform surface, which shows that there is basically no problem with the quenching process of the steel knife, and the "steelness" of the steel knife is better. In addition to controlling the quality of the steel knife, the die cutting and indentation process requires that the pressure adjustment be uniform and moderate in terms of operation technology control. The indentation line is clear and the line layout can be cut off to avoid the abnormal damage of the blade edge. . The die cutting plate should be tightened evenly to avoid bowing of the die cutting plate and ensure the stability of the die cutting pressure.

7 Do a good job of technical control of paste box quality

The carton molding process is also a non-negligible part of quality control. Cartons that are formed by adhesive bonding should pay attention to selecting the appropriate adhesive according to the characteristics of the paper surface. Such as 810 paper / plastic sealant, it has the characteristics of quick-drying, high viscosity, good adhesion and good resistance to cold and heat. It is suitable for the bonding of the lap tongue on the film-coated and polished carton. For the overlapping tongue of UV carton, it is suitable to use 818UV special sealing glue. For the molding and bonding of food cartons and cartons, 614 environmentally friendly strong adhesives (water-based) that are non-toxic, odorless, environmentally friendly, fast curing, and high strength can be used. It is worth mentioning that different types of adhesives cannot be mixed. New adhesives or similar adhesives from different manufacturers must pass a small batch of paste box tests and inspections to confirm that there is no problem with quality. Carry out batch glue box production. In addition to material quality control, attention should also be paid to the control of operation technology. For manual paste box operation, the operation method should be correctly adjusted. During the operation, the adhesive edges of each carton can be arranged in a ladder shape (even spacing), And don't arrange too many brushes at a time, so as not to cause the carton to dry before the glue is pasted, so that the carton that is pasted is not sticky and firm. After manual glue application, proper pressure should be applied to the bonded carton in time to ensure the fastness of bonding.

8 Do a good job of technical control of embossing quality

By using a partial embossing process on the paper surface, the decorative quality effect of the carton and carton can be better improved. Since corrugated cardboard boxes and cartons are embossed, they must be mounted with corrugated cardboard, which requires that the embossed pattern area of ​​the paper surface should not be too large, and the embossing pressure should not be too heavy, and the pressure should be uniform. According to the author's experience in the trial production process of the embossing machine, the temperature of the embossing is controlled within the range of 100 ℃ ~ 150 ℃ as appropriate according to the paper moisture content and the thickness of the paper. Good stiffness, the relief is not deformed after embossing is suitable. If the embossing area is large, the speed of the machine should be adjusted a little slower. This is an important technical control method to ensure the stability of the embossing quality. For products with a film on the paper surface, it is best not to emboss with heat during embossing to prevent blistering or snowflake spots on the film surface.

In summary, the technical control of the post-press processing quality of cartons and cartons involves all aspects of the production process. Only we usually pay attention to the careful control from the production of raw materials to the production operation technology, from the correct use of the machine to the technology Checking, comprehensive and serious standard production, and orderly production in accordance with product quality and production technology requirements, can better improve the post-press processing quality of carton and carton products to meet market quality requirements.

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