Influencing factors of common problems in the proc

2022-08-13
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As we all know, good binding firmness requires good paper conditions, but this condition is decreasing. The main reason is that the share of recycled paper is increasing, or the share of paper fiber that is easy to stick is decreasing, and the coating of paper is increasing. The efforts made by the machine manufacturing industry and the adhesive industry to improve the binding quality have not been known since drupa 2000. The firmness of binding products shows that with the increase of recycled paper, the firmness does not decrease proportionally as people worry. Various unreliable factors are always hidden in the binding process of joint filling method. Therefore, we must actively develop the method of measuring the tensile strength. The binding tension test value that can be achieved today was considered unrealistic in previous years. This statement is only unsuitable for the use of polyurethane hot melt adhesive

machine and adhesive technology the machine and adhesive technology preconditions for making good binding products have been increasingly improved. Although there is no revolutionary change in spine processing, the system can not be ignored, which is constantly improving and perfecting

exhibit examples

the machine technology solutions discussed below are based on representative exhibits:

· corona of Miller Martini company

· champion of Wallenberg company

· public of Kolbus company

logically, the most advanced equipment can have a variety of back processing. This is what we usually call the diversified solution of stress whitening phenomenon. Medium and low-grade machines cannot fully use various solutions due to station and price reasons

I saw many small binding machines at the Expo. Compared with large binding machines, these small machines can only consume part of the cost of fine binding processing anyway. But recently, users need small binding machines that can process all kinds of paper in their daily business

we will talk about this next. It can be seen in the figure that a diagonal notch system can be installed on a small binding machine

the development focus of binding equipment, especially binding equipment, is to greatly shorten the adjustment time, where the cross-sectional area decreases sharply. Therefore, the machine factory has made a contribution to the economic processing of the short version. Of course, this is mainly due to the influence of computer-controlled electric regulation technology: "almost everything is like doing it yourself"

people with practical experience know how to make use of new possibilities and will not mistakenly think that modern technology can replace high-tech knowledge

factors affecting the quality of binding

the quality factors of binding are very complex. The influencing factors are as follows:

· book block structure: paper, adhesive, spine material

· machine: conveying book block and clamping, spine processing system, gluing system, pressing and shaping system

· staff skills: the operator can adjust the machine to the best degree according to the product

all the details of spine processing discussed below, as long as it involves product quality, are always related to personnel skills. Careful observation of the differences between various schemes of spine processing shows that the reasons for the quality differences are in many details

without comparative research, it is impossible to immediately tell which system and what kind of paper, adhesive and product types can be used to obtain the main differences in use value. Therefore, each system is not evaluated here

influence of cutting edge geometric angle on ridge machining

the result of ridge machining depends on the geometric angle of cutting edge and the pressure angle of tool. From the perspective of development trend, all equipment suppliers recognize that the force acting on the spine can better control the book block within the processing range, and should eliminate the inevitable consequences caused by large force. The less force consumption of spine processing is mostly related to less heat release and less wear, so as to achieve accurate processing results. The purpose of any kind of spine processing is to prepare a page edge that can be glued. Therefore, the following tasks are proposed:

· expose the paper fibers as much as possible, do not damage the bottom of the fiber at the edge of the page, and expand the surface

· at the same time, avoid scattering or blocking the edge of the page with fillers, paint binders and ink

all machine factories are engaged in the research of cutting edge geometric angle and cutting condition. By adjusting the best angle of the object to be cut under the milling cutter, such as changing the position between the center of the milling cutter and the center of the book block or the rear edge of the fixture bracket, the cutting force will be reduced by nearly 4 degrees Fahrenheit lower than wearing pure cotton clothes. Striking cutting can be produced with a small angle, and the effect of force becomes reasonable

flat milling cutter

the spine plane refined by the flat milling cutter provides favorable conditions for subsequent fine roughening. In this roughening process, the depth of the incision can reach a few tenths of a millimeter. In order to eliminate the unreliability of book block guidance, most of the back pressure tools or reverse tools used are made of cemented carbide. (to be continued)

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