Business form multi-copy definition

The business form print quality system includes four levels of indicators: size and fit, color and ink, anti-counterfeiting features, and appearance characteristics. This article discusses the research results of the second-level index of multi-copy and rewriting in the first-class index of appearance characteristics in the business index print quality index system, and aims to lay the foundation for the final establishment of the business form quality specification.
First, to determine the significance of multi-copy replication definition quality indicators Multi-copy writing definition refers to carbon-free replication business forms or back carbon coated business forms when writing, the second, third, fourth joint local products Rewrite the clarity of the font. The multi-copy definition has a very important position in the business form quality system. This is because most business forms require a multiple copying function. Usually, the first one is reserved by the issuing unit, and the other ones are the receiving units. Receiving units work in accordance with the information and requirements on the duplicates, and if the information on the forms is not clear, it is easy to cause mistakes. In addition, the final ruling on economic disputes is based on the words and figures on the business forms. In China, there are no clear digital standards for the clarity and quality indicators of multicopying and rewriting of business forms. This results in indefinite quality specifications for multicopying, and it is difficult to improve copy quality. Therefore, writing a reasonable digital quality indicator to multiple partners is the key to stabilizing and improving the quality of multi-copy business forms.
Second, the research results of multi-copy rewrite definition quality indicators According to China's printing industry quality evaluation conditions, refer to the font clarity evaluation method in the printing of books and periodicals, combined with the production of Shaanxi Coal Air ticket printing factory, we determine to copy the single The font density and the item index reflect the multicopy definition. The indicator requirements are as follows.
1) Taking the density of a certain font on the second link in the multi-joint as a reference, the change in the font size of the corresponding position on the third link, fourth link, etc. is less than the specified value;
2) Using the width of the stroke of a font on the second link as a reference, the width of the pen stroke of the corresponding position on the third link, the fourth link, etc. is less than the prescribed number. Only when this modern surface indicator satisfies the requirement, the product's multiple copy and write clarity test is qualified.
Since the daily production of commercial form printing factories is very large, and commercial forms are mostly continuous web-fed printing, it is impossible to use the one-by-one detection method when determining the quality indicators. Therefore, we use the sample survey method in the mathematical statistics method to carry out the indicators. Determined, the main idea is: first determine the sampling population, under the production conditions of the party, a batch of products produced at a time for a sampling of the overall: then use the system of random sampling method, that is to determine the first sub-sample; after that, every other value, Sampling was conducted and the products were tested. The following describes the process of sample survey testing in terms of rewriting font density and pen width.
First of all. We conducted density inspections. The test equipment was made with a Italy-produced CPC 130 densitometer, and the production press was a Japanese solar brand business form printer. The commercial form was a 390-mm wide web with a basis weight of 40 g/m2 and a carbon-backed quadruple unit. Table 1 shows the results of a sampling test for an overall production lot. Due to the large number of subsamples in the sample survey, according to the Central Limit Theorem, the sampling results are in accordance with the normal distribution.

Sampling point 1 Sampling point 2 Sampling point 3 Sampling point 4 Sampling point 5 Density difference statistical value Sample 1 Two-fold 0.18 0.19 0.16 0.17 0.18
Triple 0.16 0.19 0.19 0.18 0.19 0.006 0.018
Quadruple 0.15 0.15 0.19 0.15 0.16 -0.016 0.027
Sample 2 Two 0.15 0.15 0.17 0.15 0.17
Triplex 0.17 0.19 0.18 0.16 0.18 0.018 0.013
Quadruple 0.14 0.13 0.13 0.14 0.15 -0.02 0.012
Sample 3 two 0.15 0.14 0.16 0.15 0.17
Triplex 0.14 0.16 0.19 0.16 0.18 0.012 0.015
Quadruple 0.13 0.12 0.17 0.14 0.15 -0.012 0.013

The results of the overall statistical calculation The mean and variance of the difference between the third and the second joint u=0.013 s=0.011 The mean and variance of the difference between the fourth and the second joint u=-0.027 s=0.016
In addition, the probability that the variance in the normal distribution is within ±3s is 97%, while the probability within ±5s is close to 100%. Therefore, we stipulate that the multi-joint resolution density index is: dominant lung segment ╱-3s, u+3s), and the qualified product error range is (u-5s, u+5s).
According to the test results, we use the graph to intuitively reflect the changes in the font density of the third and second links, the fourth and second links.
It can be seen that the carbon density in the back-coating quadruplex is the highest, and the font density in the third-column replication is the largest, and decreases rapidly thereafter.
Second, we examine the change in the width of the font of the quadruple single. The detection tool is a 25-fold scale magnifier. The test result is that the width of the sidewalk increases. In the ideal state, according to the decomposition of the force, the pressure on the third layer is always lower than that on the second layer. Considering the force diffusion and damping, the pressure on the fourth layer is affected. After the second layer is smaller, it is reflected that after the replication, the field density transferred to the second layer of ink for replication is greater through the third layer, the third layer is also larger than the fourth layer, and so on.
The above experiment can draw the following conclusions:
a) The width of the multi-copy pen traces is increased by layers, and the edges are increasingly blurred;
b) The font density increases first and then decreases, and the font becomes clearer;
c) The single index given on the one hand to the multi-copy resolution is inaccurate and must be more accurate and complete from the width of the imprint and the Bardot.
According to the results of mass production experiments, we consider two aspects when formulating the index of multiple-copying and writing clarity: the increase in density is beneficial to observation, and the decrease in density should not exceed the lower limit; the increase in the width of the print should not exceed a certain limit. Combined with the actual production conditions of the Shaanxi coal ticket printing factory, the qualification requirements for multi-copy and rewrite definition are: the density reduction should not exceed 20%, and the width of the print should not exceed 65%.
Binding Technology Q&A At present, rubber binding is a major technology used in the printing of books and periodicals in China. There are also many readers who have letters and calls to ask questions about the quality of binding. In order to give more readers a better understanding of the glue-binding technology, this magazine has opened up special columns for rubber-binding technology to answer questions that you have encountered in your work and to share and learn together.
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The industrial revolution has made paperback, saddle stitching, hardcover, special equipment, loose-leaf boring and so on become the main process of binding after printing.
With the development of science and technology, automated machinery replaces artificial labor, and synthetic materials play an excellent role. High-quality, high-efficiency wireless glue-binding technology has become the mainstream of post-press technology innovation.
Into the 1980s, China has successively introduced a number of advanced wireless glue-binding machines from abroad. From the late 1980s to the early 1990s, China developed its own high-level ZXJD440 type flat-packed plastic phase production line (production efficiency up to 10,000 cigarettes per hour) and BBY40/5 type disc packer and many other binding machines. It provides feasible implementation conditions for China's rubber binding process reform. The State Press and Publication Administration has made a decision in 1999. From 200 years onwards, more than four books and magazines in the country must be bound using a wireless subscription process.