Hanging flag is a common printed product for product promotion and publicity. In order to facilitate hanging, a dark line that is convenient for crease is often pressed at about 2cm at the upper end to meet the requirements of use characteristics. The traditional indentation production process is generally produced by a vertical flat die cutting machine. Because this model uses manual continuous paper for indentation, the machine is slow, the production efficiency is low, and the labor intensity is large. If several sheets of paper are placed at one time for indentation, the pressure error of the upper and lower indentation lines will be large, which will affect the crease forming effect. Especially for the thick paper hanging flag products covered with film, if multiple sheets are fed at a time for creasing, the product quality is not satisfactory. For the indentation of hundreds of thousands of sheets or even millions of sheets, the production cycle can not meet the requirements of customers to promote the timeliness of promotion. The production efficiency and quality of flag indentation urgently need to be improved and improved.
The background created by the innovative process of the indentation hanging flag of the offset press
Our company often has to undertake a large number of flag-hanging products, especially every holiday or major social day, there are many flag-hanging 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 in production. Under the pressure of the heavy production tasks of the indentation, the author once got inspiration from the letterpress process. First, he used a solid resin plate to make an indented plate, and used an offset printing machine to achieve an innovative indentation process. Therefore, through the production practice, the use of solid resin plate indentation on the offset printing machine has achieved gratifying application effects, and the product's indentation quality and production efficiency have been greatly improved. The use of offset presses for large-scale indentation production, this innovative process technology can not only make better use of idle offset presses, but also ease the production pressure of the die-cutting machine in the peak season, the process effect is satisfactory. However, because the indentation lines of the resin plate protrusions are relatively small, the indentation lines on the surface of the indentation plate have undergone more than 200,000 pressure impacts, and local lines on the surface of the resin plate are prone to cracking. Recently, when we indented the "Olympic" flag products, due to repeated use of the resin indentation plate, the local indentation line cracked in the middle of the indentation production, making the resin indentation plate unusable. It was evening again, and the company did not have a stock resin version. When the product delivery time was tight and the task was urgent, the writer suddenly had a whimsy and sprouted a new idea of ​​the process of making the indented version of the offset printing machine using 23 # binding wire After another hands-on experiment, another innovative process for indentation with an offset press was successful again, and the process effect was satisfactory.
Application method of innovative technology for making indentation version of offset printing machine by using binding wire
The author originally used a solid resin plate to make the indented version of the offset printing machine, and the indented 3-fold hanging flag product, the width of the indented plate line was made to be 0.7mm, the width of the polyester sheet at the base of the plate was about 20mm, and the length was 890mm You can directly use double-sided tape to firmly paste the resin indented version on the impression cylinder, which is more convenient for plate installation. The diameter of the 23 # binding wire is about 0.7mm, the cylindrical binding wire is small and rigid, and the operation technology and quality of the plate mounting are very problematic. If you use double-sided tape to directly stick the wire to the impression cylinder, It is estimated that there will be such a problem: one is that it is difficult to stick the wire straight to the roller corresponding to the indented layout, and it is also difficult to firmly stick to the position of the roller corresponding to the indented layout, even if the position of the wire is adjusted After being accurate, during the indentation process, it is also easy to slip under the action of pressure. Based on the above problems, the author adopts that the binding steel wire with strong rigidity is annealed by proper heating to make it lose its rigidity so as to be stretched into a straight line, and then adhere it to the film corresponding to the negative line with transparent glue. Immediately paste the double-sided tape of the corresponding area on the back of the film with a width of about 20mm, so that the film and the iron wire are pasted together on the impression cylinder. Then, use a wide layer of transparent adhesive to apply the entire indentation line Cover and paste together with film. Adopting this method to stick the iron wire, on the one hand, is convenient for the wire to easily achieve the effect of straight line, and at the same time, it can avoid the direct contact between the iron wire and the impression cylinder body, and prevent the metal-to-metal contact that is most likely to cause friction or wear. Make the wire slip. On the other hand, because the double-sided tape on the film sheet serves as a liner protection, it can effectively eliminate the pressure and cause damage to the roller corresponding to the wire. Using this method to stick the iron wire for indentation, after more than 200,000 indentations, the indentation wire has no bad running position, and the surface of the drum is not damaged at all, and the effect of indentation is no less than that of using a steel knife The quality of thread and resin plate indentation process has achieved unexpected quality effects with the binding wire indentation process, and we are all quite satisfied with this.
Reasonable adjustment of pressure and liner pressure of wire indentation
Adopting the process of binding wire indentation, considering that the outer diameter of the iron wire is significantly increased after the wire is pasted on the surface of the impression cylinder, so the thickness of the inner liner of the rubber cylinder must be reduced accordingly. An excessively soft liner is not conducive to pressure The definition of the mark line, so it is better to remove the softer cloth from the blanket and replace it with cardboard that is thinner than the cloth, so that the thickness of the liner is slightly reduced, and the depth of the product's indentation is still sufficient to maintain The process effect of the folding forming of the indentation line is convenient. The process test shows that the pressure of the indentation of the offset printing press is actually about 20 wires less than the normal printing pressure. This is because the cross-section of the iron wire is extremely small, and the smaller the contact surface, the smaller the pressure. Although the pressure is less than the normal printing pressure, there can still be obvious linear depression marks on the indentation line on the surface of the product, 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 lines, it is easy to cause linear depressions on the surface of the blanket, which will affect the normal use of the blanket when printing. Therefore, using the wire indentation process, we specially removed the original blanket used for normal printing on the machine, replaced it with a scrapped blanket and installed it on the roller for indentation. This will not affect the quality of the indentation, but also It can better save expensive blanket materials and improve the economy and applicability of the offset printing process. When installing the rubber cloth, the softer front side should be inward, and the harder cloth layer on the reverse side should be installed outward, so that the quality of the indentation can be better.
Appropriate process technology treatment of the semi-finished film
For the flag-hanging products with indented double-sided film, after the semi-finished printed double-sided film passes through the film, in the process of manual division into single sheets, some semi-finished products may have edges protruding from the edge of the film, causing the upper and lower sheets to stick to each other. It may cause difficulty in paper feeding or skewed paper feeding. In addition, double-coated coated paper products are relatively heavy, which tends to make the paper pile more compact, Feida is difficult to blow through the paper pile, and it is also prone to skew or empty sheets 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 semi-finished products by trimming the semi-finished products after coating and the excess paper edges on the left and right sides with a program-controlled paper cutter to the position of the finished product specifications. Blow through the pile of paper. On the other hand, after trimming and trimming the semi-finished products, the convex film situation is eliminated, and there will be no blocking of the upper and lower sheets. This can better ensure the automatic and continuous paper feeding of the machine and improve the production efficiency and quality of the indentation.
Quality Analysis of Hanging Flag Product with Bound Wire Indentation
On the offset press, the bound wire indentation hanging flag is used. During the indentation process, the roller's instant contact surface is small and the pressure is light. Therefore, it has the good advantage that the indentation line is clear, and the pressure can always 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 using multiple indentations. Through the comparative analysis of two different process indentation products, it can be found that the offset printing machine uses the binding wire indentation product, compared with the vertical flat press die cutting machine using the steel knife line indentation product, each offset printing machine The quality of the indentation is consistent, but the clarity 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 unfolding, which affects the product's quality. Molding and use effect. Therefore, the author believes that the quality of the indentation of the binding wire on the offset press is relatively satisfactory, and has a simple, fast, and economical application effect. This process innovation program also achieves a good result of achieving multi-use of one machine, and makes the production Human resources in short supply are better regulated and utilized.
Analysis of Production Benefits and Application Prospects of Indentation Using Bound Wire
Using an offset press for indentation, the average indentation can be 6000 sheets per hour, while the continuous production speed of the vertical die-cutting machine is approximately 1200 sheets per hour. As for the factors of paper indentation, the average number of indentations per hour is generally about 4000 sheets. Then, 157g / m2 double-coated coated paper, although the die cutting machine uses steel knife line for indentation, its upper and lower sheets The indentation effect is bound to be inconsistent, the quality of indentation is unstable, affecting the performance of the product, and the indentation is not the most complaint from customers. Therefore, from the analysis of production efficiency and indentation quality, the indentation with offset printing machine has obvious advantages. If the resin-made indentation 3-open flag hanging products are used, the plate-making area is about 180cm2, the plate material cost and plate-making cost are about 15 yuan, and the average service life of the indented plate is calculated according to 250,000 sheets, and the 3-open product has an indentation per thousand sheets. The cost of the version is 0.06 yuan, and the use of bound wire to make an indented version has an estimated service life of up to millions of sheets, and the cost of 90cm long bound wire is extremely insignificant. In addition, the pay per thousand sheets using the offset printing machine is about 3 yuan lower than that of the die-cutting machine. After deducting the difference between the energy consumption of the two machines, using 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 has the lowest production cost, and the production efficiency and indentation quality are unmatched by vertical die cutting machines. This innovative process technology can complete the traditional indentation production method. . Now we not only use this process to indent flag products, but also for other large numbers of products that need to be indented, such as single-fold DM or other products, we can also use bound iron wire for indentation.
In summary, the use of bound wire indentation hanging flags and other products on the offset press not only shortens the production cycle of product indentation, but also improves the quality of product indentation and reduces indentation production. The labor intensity of the process maximizes the efficiency of the existing production equipment and human resources, and the production process structure is better optimized.
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