Application scheme of narrow width rotary printing

2022-09-23
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Application scheme of narrow width rotary printing in label printing

narrow width rotary printing technology has become a wonderful flower in the printing field in recent years thanks to the label market increasing at a rate of more than 30% per year and the rapid changes in the label and packaging market. The so-called narrow width rotary printing brush machine generally refers to the rotary printing equipment with a width of less than 20 inches (508mm), of which the flexographic printing machine is the main one. In addition, it also includes rotary offset printing, rotary transfer printing, rotary gravure printing and rotary special processing equipment. Such as rotary hot stamping, cold hot stamping, film covering, transfer, die cutting, slitting and rewinding, super glazing, etc. Therefore, the combination of multiple processes has become a distinctive feature of narrow rotating equipment. Due to the different tension and pressure requirements between different processes, the control of tension and printing pressure has become the key to realize multi process combined printing

technology status and application

at present, with the development of technology, many equipment suppliers can provide combined equipment of flexographic printing + rotary transfer unit, but not many can realize all process combinations in one production line. Narrow width rotary printing has very obvious technical characteristics: a variety of processing methods, flexibility, diversity, high quality, high efficiency, cost saving, which shows that the narrow width rotary technology has the superior characteristics of various processes, while avoiding the relatively high comprehensive cost of medium and wide width equipment. Therefore, it is particularly suitable for the needs of the following markets

1. label market

narrow rotating equipment and technology are suitable for label printing fields, including clothing tags, cosmetics tags, bathing supplies tags, wine labels, cigarette labels, etc. In the label printing market, with the increasing variety and the increasingly complex process, the process requirements are more stringent. Self adhesive labels and film labels have different requirements for narrow width rotary label printing

(1) self adhesive labels

for ordinary self-adhesive labels, flexographic printing is generally the main method, and then wiring is combined with die-cutting and slitting devices. For prints with special requirements, printing devices can also be considered to be added for printing with some special effects. For self-adhesive label products, in fact, it is more necessary to consider the issue of production efficiency. Therefore, high-speed flexographic printing equipment has become the first choice. In addition, for ordinary self-adhesive labels, special process units such as super glazing can be selected to realize UV glazing of mirror effect and increase the added value of products

(2) film labels

for film labels, it is necessary to consider how to eliminate film deformation and static electricity in the configuration of equipment. There are two main reasons for deformation, one is tensile deformation, the other is thermal deformation. To solve the problem of film deformation, first of all, we should choose materials with stable quality and good uniformity. Secondly, in terms of equipment configuration, it is best to choose the cold UV curing method, which not only has fast curing speed, but also theoretically will not cause material deformation. In addition, it is also necessary to consider whether the equipment has a device to disperse tension, such as the driving roller or pressing roller device of the main force

in recent years, the popular product in the label market is in mold label, which is a special film label. This kind of label can be integrated with the bottle body in the process of container molding. It not only realizes exquisite decoration, but also has very good anti-counterfeiting performance. Although the added value of this product is very high, it is difficult for manufacturers to achieve high added value in actual production. The reason is that in addition to the requirements for printing equipment and film materials, this kind of label also needs to solve two outstanding technical problems, one is to eliminate static electricity, and the other is high-speed die cutting

the generation of static electricity is caused by the label material in the mold. The solution is to use the static electricity elimination device to control. Recently, some ink suppliers have provided a kind of antistatic ink, such as the UV antistatic ink for in mold labels provided by arnoy company, which can effectively prevent the generation of static electricity and ensure good printing performance

die cutting speed and accuracy is another difficulty encountered in the printing process of in mold labels. Due to the large amount of static electricity generated in the production process of in mold labels, and the low stiffness of the film itself during die cutting, it is easy to produce the phenomenon of floating. Therefore, it is necessary to equip professional suction conveyor or in mold label receiving device when selecting equipment

in addition, the application of cold stamping and printing units will also greatly increase the added value of in mold label products

2. Packaging market

narrow width rotary printing equipment is also suitable for diverse packaging markets, including food packaging, cigarette packaging, beverage packaging, etc

3. special lottery market

in the field of anti-counterfeiting ticket printing, narrow width rotary printing equipment is also promising, such as being applied to the printing of scratch lottery tickets

solution introduction

after analyzing the above basic equipment configuration, we will discuss the specific solution. The overall solution of label printing is divided into offline mode and online mode. The offline solution is suitable for complex and changeable short version products. Due to the small number of products and complex process, offline mode can give the best play to the efficiency between different processes; The connection solution is suitable for medium and long version products with complex processes. Because the product process is relatively stable, the connection method can maximize the production efficiency and product stability of assembly line operation

for cosmetics labels and in mold labels with high printing quality in the market at present, we propose the following two typical printing solutions

1. flexographic printing based solution

in the first printing station, we recommend using rotary printing, adding hot stamping in the middle or cold stamping when tightening the head flange nut, and then adding a group of printing or flexographic printing units. The final process is die cutting or winding, using UV curing

the advantage of this combination is that in general, most of the films of cosmetic labels are transparent. Therefore, the first color group adopts the rotary printing method, and the opaque white ink backing printing is carried out before printing the color pictures and texts, which can make the color pictures and texts more distinctive. Moreover, due to the flat opaque white as the basis, the restoration effect of picture and text printing will be more prominent. Graphic printing adopts flexographic printing. Hot stamping and cold stamping can improve the added value of products. Finally, the printing or flexographic printing unit is used to upload and control the software light of the system. Since this scheme is aimed at film labels, the cold UV method can be used to increase the servo driven cooling water roller to distribute the tension, and the elimination of static electricity and the air suction device of die cutting should also be considered. At the same time, this scheme can also add gravure printing units. Generally, gravure printing adopts hot air drying; This configuration can also realize some special metal ink printing. This configuration can also basically meet the printing needs of in mold labels. From the perspective of investment, the total investment is small, which is suitable for small and medium-sized enterprises

2. solution combining glue and flexibility

this scheme still adopts rotary printing in the first printing station, followed by offset printing units that can be interchanged with flexographic printing for printing color pictures and texts: after that, a group of gravure printing units can be equipped to obtain the special effects of metal ink; After that, a group of printing units are equipped for glazing or special effect printing, followed by a group of flexo glazing units I, and finally equipped with the same die-cutting and rewinding units

the advantages of this scheme are: low offset printing cost, good dot printing effect, and more suitable for high-grade product printing; At the same time, due to the opaque white ink backing printing with rotary printing before offset printing, the printing effect of offset printing is guaranteed, and then the gravure printing unit is added, which further enriches the integrity of the process. In this scheme, hot stamping, cold stamping and other processes can also be equipped. Its more prominent feature is that it improves the work efficiency, and all process units can be interchanged, realizing the maximum process flexibility

this scheme can meet all the process needs of Jiping, and can adjust the process at any time according to the changing market, so it has a very strong market competitiveness. However, its investment scale is also relatively large, which is suitable for some large-scale label printing enterprises

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