Comparison of common printing methods of the hotte

2022-09-29
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Comparison of several common printing methods of corrugated boxes

release date: Source: China paper industry

corrugated boxes are a kind of ordinary paper packaging products closely related to our life and production. The printing quality of corrugated boxes is not only related to the appearance quality of corrugated boxes, but also affects the sales prospects of packaged products and the image of commodity production enterprises. Therefore, it is particularly important to analyze how to improve the surface printing effect of corrugated boxes, how to choose the appropriate printing process, and further reduce the processing cost of corrugated boxes. Here we will discuss several aspects of this important shortcoming: the end of the system versus chaos

I. processing technology of corrugated board the processing technology of corrugated board is mainly divided into two categories

1 Automatic corrugated board production line production process this corrugated board production process is widely used, and has the advantages of large production batch, large carton forming volume, good corrugated shape quality, force value accuracy: within 1 of the indicated value, etc. The corrugated board produced by this process is usually made into cartons through water-based printing, slotting, pasting, molding and other processes. Cartons produced by this process are mainly used for transportation packaging

2. Production process of semi-automatic corrugated board production line the corrugated board production process is to first print face paper, and then mount it with corrugated core paper and paperboard. The corrugated board produced by this process is usually packed into boxes through die cutting, indentation, nail sticking and other processes. The cartons produced by this process have good molding quality and surface treatment effect. The cartons produced by this process can be used as sales packaging

II. Conventional carton printing methods conventional carton printing methods mainly include flexo printing, offset printing and printing

1 Flexographic printing corrugated box the conventional flexographic printing corrugated box process is to print directly on the corrugated board, using water-based ink, so it is also called watermark. Flexographic direct printing has the following characteristics:

(1) large format. The maximum width of a wide flexographic printing machine can reach 2.5m-2.8m

(2) low price. Flexo has high printing resistance and can be reused; Ink prices are also low

(3) linkage production can be achieved, such as printing, slotting, indentation, binding (gluing) boxes, baling and so on

(4) the strength of cartons decreases less. Because flexo printing is light press printing, it has little effect on the strength of corrugated board

(5) the printing accuracy is not high. The number of lines added for conventional offset printing is 175 lines/inch, while the number of lines added for flexo cartons is 35 lines/inch - 65 lines/inch. It is a low precision printing method, which is most suitable for printing text line drafts. Although the printing quality of four-color images has improved in recent years, it is still limited

(6) plate making is easy and difficult, text line draft plate making is easy, and four-color image plate making is difficult

(7) the stability of printing quality is poor, which is mainly reflected in the difficulty in controlling the depth of printing ink. Flexographic direct printing process is applicable to the production process of the first kind of cartons. At present, it is widely used in carton factories in China

2. There is contact friction between offset printing corrugated and screw rod; The conventional offset printing of cartons corrugated cartons adopts the indirect printing method, that is, the paper on the carton is printed first, and then the printed paper is mounted on the corrugated cardboard. Due to the high resolution of PS version, very fine printing patterns can be printed. At present, the vast majority of high-end corrugated boxes used for sales and packaging in China are offset printing products. Offset printing corrugated boxes have the following characteristics:

(1) it is not suitable to use the cardboard linkage production line, but only suitable to use the single-sided corrugated machine, with low production efficiency

(2) the format is limited, which is generally smaller than that of flexo cartons

(3) printing products are very fine, and the number of lines added can reach 150 lines/inch - 200 lines/inch

(4) it is easy to make plate, which is the routine plate making of PS plate

(5) surface finishing can be carried out, such as film covering, polishing, etc

(6) high printing cost

(7) the printing quality is relatively stable

In addition

3 Silk printing corrugated box

the process of silk printing corrugated box adopts direct printing. Because the inking rate of the silk plate is directly proportional to the hole spacing of the silk, the resolution of silk printing is not high, and the image accuracy is low. The number of conventional lines is 60 lines/inch - 80 lines/inch. Wire printing corrugated box has the following characteristics:

(1) it is not suitable for linkage production line, and the production efficiency is low

(2) the printing format can be large or small

(3) printing can be completed before mounting and cartoning, or after mounting and cartoning

(4) suitable for printing non fine products. The ink color of silk printing is thick, so its color saturation is high and the visual effect is strong, especially for spot color printing

(5) plate making is easy and low cost

(6) low printing cost

(7) the printing quality is relatively stable

III. new printing box making method

1 When the plastic gravure composite carton process adopts a single-sided corrugated production line, if the surface paper needs to be covered with a bright film after printing, and the production batch is large, you can not print on the surface paper, but use the gravure printing method to complete the gravure printing on the plastic film, add a white background, and then compound the printed plastic film with the surface paper first, and then complete the carton making according to the conventional carton forming process. The characteristics of this process are:

(1) the production cost of cartons is low. When the production batch is large, this process can greatly reduce the printing cost and material cost of face paper. Because face paper does not need printing, uncoated white board paper can be used, which greatly reduces the cost of face paper

(2) exquisite printing. Because plastic gravure printing is used, the printing effect can be comparable to that of offset printing. Special attention should be paid to the size change and deformation of plastic film during plate making and printing; Otherwise, the surface paper of the carton will be out of alignment with the lower cardboard

2. The gravure printing composite carton process of coated paper can be used when the production batch is relatively large, film coating is not required, and the printing effect is good and the cost is low. This process is to use a paper gravure printing machine to print a thin coated paper, and then combine this beautifully printed coated paper with ordinary slag paper or carton paper, as a whole as the top paper of the carton, and then mount it and form the normal carton. The characteristics of this process are:

(1) the production cost of cartons is low. The main reason for the cost reduction is to change the white board into low gram weight coated paper and compound it with cheap box board paper, which reduces the material cost

(2) exquisite printing. The printing effect of paper gravure printing is very exquisite

(3) gravure plate making is complex and expensive, which is not suitable for printing carton products that are often revised

(4) the operation and control methods of paper lamination, cartoning and other process in the printing plant should be carefully explored, accumulated and implemented reasonably, otherwise it is easy to lead to the increase of scrap rate

3. Direct offset printing corrugated box technology corrugated box direct offset printing technology has been relatively mature in foreign countries. It is to print corrugated board directly on a special offset press. Suitable for processing thin corrugated boxes

this process can not only ensure the good formability of cartons, but also complete exquisite face paper printing. However, the price of the printing machine used is relatively expensive. At present, it does not adapt to China's demand standards and is not suitable for the carton industry to adopt in the near future. However, in the next few years, this process may become a new development direction of China's high-end carton printing

4. Flexographic preprint and gravure preprint corrugated box processes have developed rapidly this year. These two processes first print face paper in the form of web paper, and then complete the production of corrugated board on the full-automatic corrugated board production line. The printing quality and molding quality of cartons are relatively high, but the investment is relatively large, and it is not suitable for small batch production

in the domestic carton industry, three conventional corrugated box printing methods are widely used and have become the mainstream of corrugated box printing at present. The new printing box making method, because the hot spots of equipment, materials, processes, operations and other technologies have not been fully mastered, the investment is also relatively large, and the promotion is still relatively difficult at present. However, in order to improve the quality, reduce the total cost of cartons, obtain the maximum profit and increase the competitive advantage in the market, it is imperative for carton enterprises to adopt a new printing and cartoning process

from the overall development of carton printing process, the plate making and printing technology of flexo direct printing corrugated carton process need to be improved as a whole, plastic gravure printing, carton gravure printing, web offset printing process need to be promoted and improved, and the production process of direct offset printing and pre printing corrugated carton should also attract our attention

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