The quality of binding is not related to the quality of the folding
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When customers complain about the quality of binding of certain folding products, folding is one of the important processes in the binding process, and it is often easy to become the focus of criticism. In fact, the defects and shortcomings of the products in the binding process are not entirely the responsibility of the folding department, and sometimes they are completely irrelevant. The following quality failures seem to be related to the quality of the fold, but in reality it is not necessarily the case.
The line position does not coincide with the color line
The effect of paper thickness on the quality of the fold must be considered when designing the fold product. In general, in multiple folds, the size of the page folded inside must be slightly smaller than the external page, that is, the design department must give a certain amount of cropping compensation to increase the actual cutting amount. If the amount of compensation is too small. The internal page will interfere with other pages due to the size being too large. The collision between the pages causes the external page to be arched and the whole book is flat. Therefore, for multiple folds, it is best to explicitly give the amount of compensation in the design process. Otherwise, once the document with this design defect is sent out, as the final defense department, the binding department has to compensate the page cutting amount during the folding process. In this case, if the product's polyline position is just the same as the color division. If the boundaries overlap, the actual mismatch will be caused by the crop compensation.
The inner fold page size is too small
Under normal circumstances, the standard cutting compensation amount for a single page is 1.5mm to 3mm, but if multi-layer paper or thick paper is used, the cutting compensation amount of the inner folding page should be appropriately increased. However, if the amount of compensation is too large, the actual size of the in-fold page will be small due to the large amount of actual cutting. In reality, we often see the practice that the design department does not stipulate or set the amount of cropping compensation in the design sheet. Instead, it is tempted to save trouble and directly ask the binding department to solve the problem of cropping compensation. This type of practice is especially common in some simple folding operations. For example, when designing a direct mail\envelope for sending a bank statement, the shorter page should be about 2mm smaller than the other two long pages. However, most of the practice is to bypass the design process. Cut the size of the third page directly to a relatively short length. In order to fundamentally prevent the problem that the in-fold page is too small due to the excessive amount of actual cutting. It is best to specify the amount of cropping compensation directly in the design sheet. Under normal circumstances, it must be stated that it must not exceed 3mm.
Paper is cracked at the fold line
When the fibers of the paper are stretched too far apart. Paper cracking will occur. If this happens in the field, the result is especially bad. There are many reasons for paper cracking, such as no indentation before folding; the water content of the paper is too low; the setting of the folding roller is incorrect. Among them, the first reason is the most common. No matter what kind of printed product. Customers want the cost to be as low as possible, and the added value of the product can be as high as possible. In the case of the customer's recognition of the added value of the product and the importance of the appearance, it is necessary for the relevant departments of the printing and processing unit to advise the customer to carry out the indentation processing before the folding, so that the customer willingly increase the cost. Under normal circumstances, if the folding direction of the paper is perpendicular to the direction of the silk, the fold line passes through a thicker area such as the solid ink layer, the paper has a large amount of paper, or the cover of the book, etc., the fold line must be indented beforehand. Get clear, accurate fold lines.
Paper wrinkles at the corners
In multiple vertical folding. The corners of the page (near the intersection of the fold lines) are easily wrinkled. To avoid such phenomena, appropriate precautions must be taken. Common reasons are:
The order of 1 folds is unreasonable, so that the folding pressure is too high, so that the paper at the corners is wrinkled.
The 2 fold process is unreasonable. The air is trapped inside the book sticker and cannot be discharged smoothly, thus affecting the folding effect. For example, first make two parallel folds on the page, then perform two parallel folds in the vertical direction. This solution can easily cause air retention inside the signature.