About the Kolbus binder machine operation (below)
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After the above-mentioned transformation of the grooved part of the KM470, the penetration of the groove is obviously improved, and it is extremely wear-resistant, and generally no replacement is required for at least one year.
The overall quality of the book contains the following 16 quality elements:
1, the back is centered, not skewed;
2, the cover is positioned accurately (not before or after);
3, the edges and corners are clear without steel edges, and the back is flat without roundness;
4, the book back width is consistent;
5, solid, not short;
6, the side glue is firm, no glue;
7, the inside of the book core is not permeable;
8, the front and back pages of the book block do not wrinkle;
9, after the glue is solidified, the horizontal tensile strength is sufficient (previous chapter has been discussed);
10, the bottom and side glues are sufficiently long;
11, the book core is milled, milled, and does not drop pages;
12, pull the groove to pull through (previous chapter has been talked about);
13, the two sides of the plastic is moderate (ie, the amount of glue is moderate);
14, the book core content is correct (to eliminate more, less, wrong posts):
15, the thickness of the glue layer should reach 0.5 ~ 1.5mm (depending on the thickness of the book).
The following focuses on some of the elements:
In the first item, the author believes that whether the back word is centered depends mainly on the quality control of the previous process. Specifically, it is the control of printing running plates and cover cutting. In actual production operations, it is necessary to strengthen management in this area. This also involves problems with the supply of raw materials. For example, signatures must be bumped and bundled to ensure a good material condition at the time of the page, such as the quality of the hot melt adhesive.
Item 2, if the product we open is a set of books or has a frame on the cover, it will impose quite demanding requirements on the front and back movement of the cover. It can be controlled from two aspects. First, the cover must be cut enough. Accurate; second, the book core should be positioned consistently in the book holder, and the resistance control of the cover in operation should be better.
The third item is the angular problem. This is one of the main appearance quality elements of paperback books. To achieve sharp edges and corners, the transition naturally has no steel edge. Firstly, the clamping force of the backing and forming mechanism should be moderate in the horizontal direction. It should not be too large. If it is too large, it will form a steel edge. If it is too small, it will not be formed. The adjustment of the vertical direction depends on the hardness of the book block and the number of grams of the cover. Generally, the book core is hard and the cover number is large. It can be a little over the plane of the back of the book (ie, 0.5 to 1 mm high), otherwise it should be level with the plane of the ridge, or even slightly lower. Secondly, the forming effect of the back is related to the time adjustment of the two movements of the support and the clip. The support is up and down, and the clip is horizontal. If the action of the support is completed before the clip, the corners of the back are particularly distinct. Completed with the clip at the same time. Then the corners are not very obvious. And the back is slightly curved. Therefore, the latter is generally suitable for the case where the cover is soft, and the former is suitable for the case where the cover is hard.
In the fourth item, due to the influence of the folding, there are generally certain thickness differences at both ends of the book block, which tends to cause the inconsistency of the upper and lower widths of the book back. At this time, as well as the height adjustment of the two ends of the bracket to correct and make up. However, when the book block is thick, the difference in thickness between the upper and lower sides is also increased. At this time, it is preferable to take a flattening measure to reduce the difference in thickness.
The seventh item is the problem of the inner side of the book block. There are three reasons for this phenomenon: First, the distance from the bottom of the book board to the back of the book is too large, the book core is easy to open after milling, and the glue is stuck when the glue is applied; The amount is too large, too high, the glue is squeezed into the book block when the glue is applied, causing the glue to be bleed; the third is caused by the too high the weight of the support. This can be avoided by adjusting from the above three aspects.
Item 8, the book core is also easy to wrinkle before and after, is also one of the headaches. So what is the cause of wrinkling? After analysis, it is not difficult to see that there are the following points: 1 the book core is soft, if necessary, can be lined with the front and rear rings; 2 the amount of glue on the bottom and side glue is too high; the thickness of the cover is 3 The thickness of the back of the book is small, which should be slightly larger than the thickness of the back of the book; 4 the cover is too hard. At this time, the indentation should be deepened and pressed in place to completely eliminate the inherent stress of the cover paper; 5 the over-stretching or the non-parallel with the back of the book. In the actual operation, we must find the main reason to solve, and then assist the adjustment in the remaining aspects, the wrinkle problem should not be difficult to overcome.
Let's talk about the thickness of the glue layer. Generally speaking, under the premise of full book bonding strength and no empty back, the rubber layer should be thin and not thick. First, from the appearance of the appearance, the back of the book is formed when the rubber layer is thin, and the round back is easy to appear when thick. It is economically considered that the waste caused by thick rubber layers and increased costs cannot be underestimated. However, in the book with a thickness greater than 20 mm, as the thickness of the book block increases, the rubber layer should be correspondingly thickened to ensure sufficient book back strength.
Finally, we must fully meet the needs of our customers. This is the only measure to measure the overall quality of our products, and it is our ultimate pursuit.