Factors affecting common ridge processing problems II

The manufacturer holds a different view in the direction of rotation of the flat milling cutter.

• When the leveling cutter turns to the right, the angle at which the milling cutter enters the milling material changes with the thickness of the book block. The exit angle of the knife remains unchanged.

• When the leveling cutter turns left, the angle of the outlet of the milling cutter changes as the thickness of the book block increases. If the rear edge of the book block is not clean after machining with the main cutter, the left-handed tool is particularly advantageous. The edge finish of the book block milling back depends on the size of the cutter in and out.

Cutting tool

As long as the firmness of the book is ensured by the use of book pins, the conventional cutting tools will certainly be used in the future. Diagonal notch technology works on the principle of diagonal hobbing. Diagonal line processing technology will be described in detail later.

Hair Technology

At present, the binding machines provide more and more similar hair-driving techniques. Surveys have shown that the depth of the incisions, which are closely spaced side-by-side, allows the paper fibers to be better exposed. This requires precision. In order to achieve the desired effect, it must be ensured that the book speed is consistent with the ratio of tool rotations. Therefore, the frequency of controlling the number of tool revolutions is of decisive significance.

The difference between the different disc type hair drives is mainly due to the different angles of the hair cutting tools during grinding. Each manufacturer has its own unique angles, such as rake angle, wedge angle, relief angle, and acute angle.

Another difference is the adjustment angle of the tool spindle and the machining plane. Fine adjustment of incision depth and incision distance can achieve the best hairiness effect for different papers.

Diagonal processing

The round roll cutter occupies a special position in the spine processing. The feature is that the surface of the edge of the book page can be enlarged by the new diagonal arrangement of the tool. This tool guarantees the basic shape and the fixed distance of the cut. It differs from the methods that have been common until now, and is sharpened at the edge of the edge of the cut.

Compared to other spine processing methods, the glued book block does not have a leverage angle of 90[deg.] when it is opened, but rather has a diagonal angle with the open book block. Therefore, the adhesive film produces a much smaller folding stress than other hair-triggering techniques.

Of course, the expanded surface of the exposed fibers when the edges of the page are sharpened also include the exposed paper coating surface. Practice has shown that the heat that may be generated by friction on the coated paper will have a detrimental effect to a certain extent, that is, the paint clogs the surface of the spine.

In any case, the contact path of the blade on the book block is much shorter than the contact path of the disk cutter.

Paper dust

So far, most of the mechanical dust removal using disk or roller brushes and different bristle materials can achieve satisfactory results. Of course, the optimal adjustment of the tool is also a prerequisite. In the existing rough depth through the smallest part of the fine grinding, not so much to prevent it is to facilitate the maximum penetration of glue.

Eltex uses a contactless assembly for dust removal after milling and back machining. This is the physical principle of using static electricity. This principle can eliminate the side effects caused by friction.

Spine Processing and Coating

Modern spine finishing methods aim to fix the size of the compound on the surface of the edge of the book page. Therefore, the requirements for rubber compounds and gluing methods are increasing. This must ensure that the size of the rubber, uniform distribution, and wetting of the rubber do not form cavities. These are all adjustable rheological properties.

In particular, when processing paper that is not well-suited for binding, the spine processing and gluing system must be optimally adjusted to each other. For example, the following answer to the question is noteworthy:

• What is the difference between an adhesive coated film on a finely brushed spine and a roller coated film?
· Which glue+glue sizing system guarantees the best adhesion in terms of firmness and operability when using the spine processing methods and high-grade paper mentioned in this paper?

Correct choice of spine processing equipment

Choosing the best spine processing equipment not only needs to be considered between different manufacturers, but also depends on how the manufacturer's technical solutions are.

• The decision to prioritize ridge processing without comprehensive consideration of gluing is incomplete.
There is no universal solution. Investors must understand the most important product structure and paper types processed, and find out the preferred solutions for the company.

· The main milling cutter for the fine-milling book block belongs to every complete spine processing device. In order to determine the best solution, the actual incision requirements are put forward by the binder:

- Machine efficiency/h
- book block thickness mm
- Paper type g/square m
- Folding way printed sheets / 16
- Milling depth mm; tolerance mm

• The pressure of the clamps and pressing tools must be guaranteed during processing so that all signatures in the book block remain firmly secured.

• The leveling cutter must be able to compensate for the unevenness produced by the milling back. The use of a book-smoothing grinding process creates the preconditions for fluffing, so that the hair-cutting tool cuts all parts of the spine plane to the same depth with a minimum cutting depth (for example 0.2 mm).

• The knife must pass through the entire plane of the spine so that the paper fibers at the edge of the book page are evenly revealed and these fibers must not be damaged.

• The hair-blow method, size and glue system must match each other.

Technical Training

Of course, the biggest change in the Binder is the number of clips and the number of spine processing stations, which must guarantee certain reliability. At present, people can discuss various processing requirements in detail for a certain product. Practice has shown that people who change machinery and equipment specialize in how to make use of priority adjustment schemes, are unwilling to change tools and components due to time, and are not proficient in how to optimally adjust tools. When this happens, it must be stressed that there is an urgent need to focus on worker training. Because it is not enough to rely on machine manufacturers to provide compulsory training for the pilot.

In-flight and regular training guarantees the ability to use the installation conditions that are favorable for the quality of the product. Therefore, when selecting spine cutters, in addition to considering technical solutions, technical training requirements should also be generated. Continuous investment makes it worthwhile for staff to make full use of existing technology to improve maintenance capabilities.