Innovative process for indenting the flag on the offset press with the binding wire
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Hanging flag is a kind of common printed matter for product promotion and publicity. In order to facilitate hanging, at the upper end of about 2cm, it is necessary to press a dark line for crease to meet the requirements of use characteristics. The traditional indentation production process is generally carried out by using a vertical flat die-cutting machine. Since this type of machine is indented by manual paper-feeding, the machine speed is slow, the production efficiency is low, and the labor intensity is high. If a few sheets of paper are placed for indentation at a time, the pressure error of the upper and lower indentation lines is large, which affects the crease forming effect. Especially for the thick paper hanging flag products of the film, if the paper is indented at multiple times, the product quality is not satisfactory. For hundreds of thousands of indentations and even millions of indentations, the production cycle can not meet the requirements of timeliness of customer promotion and promotion. The production efficiency and quality of hanging flag indentation are urgently improved and improved.
The background of the innovative process of offset printing and stamping
Our company often has to undertake a large number of hanging flag products, especially for festivals or socially significant festive days, there are many hanging flag products that need indentation, the number of products is large, the delivery time is urgent, and the special vertical The die-cutting and creasing machine is difficult to meet the urgent needs of production. Under the pressure of the indentation production task, the author has been inspired by the letterpress process. First, the indentation plate is made by the solid resin plate, and the indentation innovation process is realized by the offset printing machine. Therefore, through the production practice, the solid resin plate indentation on the offset printing machine has achieved gratifying application effects, and the indentation quality and production efficiency of the product have been greatly improved. The use of offset printing machine for large-scale indentation production, this innovative process technology can not only make better use of idle offset printing machine, but also relieve the production pressure of the die-cutting machine during the peak season, the process effect is satisfactory. However, since the indentation line of the resin plate protrusion is relatively small, the indentation line on the surface of the indentation plate is subjected to pressure shock of more than 200,000 times, and the local line on the surface of the resin plate is liable to be cracked. Recently, when we indented the "Olympic" hanging flag products, due to the repeated use of the resin indentation plate, the partial indentation line appeared in the middle of the indentation production, and the resin indentation plate could not be used continuously. At this time, it was night, the company did not have the resin version in stock. In the case of tight delivery time and urgent tasks, the author suddenly thought, and sprouted a new idea of using 23# binding wire to make the offset printing plate of offset printing machine. After another hands-on test, another innovative process of indentation with an offset press was successful, and the process was satisfactory.
Application method of innovative technology for making indentation plate of offset printing machine by binding wire
The author used the solid resin plate to make the indentation plate of the offset printing machine, and the hanging flag product with the indentation 3 opened, the width of the indentation plate line was 0.7mm, the width of the polyester plate of the plate base was about 20mm, and the length was 890mm. It is possible to directly adhere the resin indentation plate to the impression cylinder by using double-sided tape, and the plate loading is convenient. The 23# binding wire diameter is about 0.7mm, the cylindrical binding wire is small and steel, and the mounting technology and quality are very problematic. If the double-sided glue is used to directly attach the wire to the impression cylinder, It is estimated that there will be such a problem: one is that the wire is difficult to stick flat on the roller corresponding to the indentation plate, and it is also difficult to firmly adhere to the position of the corresponding indentation plate of the roller, even if the wire is pasted. After the accuracy, during the indentation process, the slip phenomenon is also prone to occur under the action of pressure. Based on the above problems, the author first adopted a suitable steel annealing wire to pass the appropriate heat annealing treatment to make it lose its rigidity so as to be stretched into a linear shape, and then adhere it to the corresponding film of the negative line with a transparent glue. Then, the double-sided adhesive of the corresponding area is pasted on the back of the film piece with a width of about 20 mm, so that the film piece is attached to the impression cylinder together with the wire, and then the entire indentation line is covered with a layer of transparent transparent glue. Together with the film, all cover the paste. In this way, the iron wire is adhered, on the one hand, the wire bonding can easily achieve the straight line effect, and the direct contact between the wire and the impression cylinder body can be avoided, and the contact between the metal and the metal is prevented from being the most prone to the sliding wear or The wire is slipped. On the other hand, since the double-sided tape on the film sheet protects the pad, the pressure can be effectively eliminated and the drum corresponding to the wire can be damaged. In this way, the iron wire is adhered to the indentation. After more than 200,000 times of indentation, the indentation wire has no bad running condition, and the surface of the roller is not damaged at all. The effect of the indentation is no less than that of using a steel knife. The quality of the line and resin plate indentation, the use of the binding wire indentation process to achieve unexpected quality effects, we are quite satisfied.
Wire indentation process pressure and reasonable adjustment of gasket
In the process of binding the wire indentation, considering that the outer diameter of the rubber roller is obviously increased after the wire is attached to the surface of the impression cylinder, the thickness of the inner liner of the blanket cylinder must be correspondingly reduced, and the too soft gasket is not favorable for realizing the pressure. The sharpness of the trace, so it is advisable to remove the softer cloth inside the blanket and replace it with a cardboard that is thinner than the cloth. If the thickness of the liner is slightly reduced, the indentation depth of the product is still sufficient to maintain The process effect of folding and forming the indentation line. The process test shows that the pressure of the offset of the offset printing machine is actually about 20 filaments smaller than the pressure of the normal printing. This is because the cross section of the wire is extremely small, and the smaller the contact surface, the smaller the pressure is correspondingly. Although the pressure is lower than the normal printing pressure, the indentation line on the surface of the product can still show obvious traces of linear depression, which fully meets the quality requirements of the indentation product. In addition, considering that the surface of the blanket is repeatedly squeezed by the small indentation line, it is easy to cause linear deformation of the surface of the blanket, which will affect the normal use of the blanket during printing. Therefore, using the wire indentation process, we specially removed the original blanket used for normal printing on the machine, and replaced it with a scrapped blanket to be indented on the drum, so that it does not affect the quality of the indentation. It is better to save expensive blanket material and improve the economics and applicability of the offset process of the offset press. When installing the blanket, the softer side should be facing inward, and the harder side of the fabric should be installed facing outwards, so that the quality of the indentation is better.
Appropriate process technology for semi-finished products
In the process of indentation double-sided film hanging flag, since the printed semi-finished product passes through the film on both sides, in the process of manually dividing into a single sheet, some semi-finished products may have a film protruding at the edge, so that the upper and lower sheets are mutually adhered. Causes paper feeding difficulties or paper skew. In addition, the coated paper products of double-sided film are relatively heavy, which makes it easy to make the paper pile appear relatively tight. It is difficult for Feida to blow through the paper pile, and it is prone to arbitrage or emptying during automatic paper feeding. It has a great impact on production efficiency and product quality. In this regard, we can reduce the area and weight of the semi-finished products by cutting the semi-finished products of the semi-finished products and the excess paper edges on the left and right sides with the program-controlled paper cutter to directly cut the position of the finished product. Blow through the pile of paper. On the other hand, after the trimming of the semi-finished products is neat, the convex film is eliminated, and the adhesion of the upper and lower sheets does not occur, so that the automatic and continuous paper feeding of the machine can be better ensured, and the production efficiency and quality of the indentation are improved.
Quality Analysis of Hanging Flags with Bounding Wire Indentation
The binding wire indentation flag is used on the offset printing machine. During the indentation process, the roller has a small contact surface and a light pressure. Therefore, the indentation line has a good advantage, and the pressure can be kept constant during the indentation process. The depth of the indentation is relatively uniform, which is unmatched by the quality of the vertical flat die cutting machine with multiple indentations. Through the comparative analysis of two different process indentation products, it can be found that the offset printing machine adopts the product of binding wire indentation, and compared with the products of the vertical flat die cutting machine which adopts the steel knife line indentation, each of the offset printing machines The quality of the indentation is consistent, and the sharpness of each indentation of the die-cutting machine is obviously different. When some products are folded and formed, the indentation line is prone to deflection or folding, which affects the product. Forming and use effects. Therefore, the author believes that the quality of the indentation of the bound wire on the offset printing machine is satisfactory, and has a simple, fast and economical application effect. This process innovation solution also achieves a good effect of achieving multi-purpose use of a machine, and enables production. The human resources that are in short supply are better regulated and utilized.
Analysis of production efficiency and application prospects of binding wire indentation
The indentation is carried out by an offset printing machine, and an average of 6,000 indentations per hour can be completed, while the vertical die-cutting machine has an average production speed of about 1200 per hour. If the number of one-time feeding is 4, the manual operation cannot be eliminated continuously. The factor of the paper indentation, the average number of indentations per hour is generally about 4,000 sheets, then, the 157g/m2 double-sided coated coated paper, although the die-cutting machine is indented with a steel knife line, its upper and lower sheets The indentation effect is inconsistent, the quality of the indentation is unstable, affecting the product's performance, and the indentation is not the most complaints from customers. Therefore, from the analysis of production efficiency and indentation quality, the use of offset press indentation has a clear advantage. If the resin version of the indentation 3 open specifications of the hanging flag product, the plate making area is about 180cm2, the plate cost and plate making cost is about 15 yuan, the average life of the indented version is calculated according to 250,000 sheets, 3 open products per thousand indentations The cost of the edition is 0.06 yuan, and the indentation version is made of the bound wire. The service life is estimated to be several million sheets, and the cost of the 90 cm long binding wire is extremely negligible. In addition, the wages per 1,000 sheets of the indentation of the offset printing machine are about 3 yuan lower than that of the die-cutting machine. Except for the difference between the energy consumption of the two machines, the indentation with the offset printing machine can still save about 300 yuan per day. Therefore, the author believes that the use of offset printing machine indentation flag products, the lowest production cost, production efficiency and indentation quality is unmatched by vertical die-cutting machine, this innovative process technology is to replace the traditional indentation production method . Now we not only use this process to indent the flag, but for other large quantities of products that require indentation, such as single-fold DM sheets or other products, we can also use the binding wire for indentation.
In summary, the use of binding wire indentation flag and other products on the offset printing machine not only shortens the production cycle of the product indentation, but also improves the quality of the indentation of the product and reduces the production of indentation. The labor intensity of the process maximizes the utilization of existing production equipment and human resources, and the production process structure is also optimized.