The level of the operator of the book binding and binding technology is directly related to the stability of the quality of the glue binding products, so it is very important to train the skills of the operators. Some solutions to practical problems. It can take the form of a symposium, exchange and learn from each other, continuously sum up experience, and gradually systematize and institutionalize. For example, if the back milling cutter on the glue binding link line is used for a long time, the paperback glue binding book will have spine, uneven glue and other quality problems. Practice has found that if the knife is sharpened once every two weeks, It will effectively avoid the above situation; for example, when the packaged semi-finished product is cut continuously, the blade is easy to stick hot melt adhesive, and a light layer of silicone oil can be used to effectively avoid the above situation when installing the knife To ensure the cutting quality.
In addition, 1 / 2-overlap conveyor belt should be used in the glue-gluing linkage line, which can effectively increase the condensation time. Generally, the time from glue application to three-sided knife cutter cutting should not be less than 3 minutes, so as to ensure the quality. Of course, the use of new materials is also a factor to improve efficiency and ensure quality. For example, the use of front steel blades greatly reduces invalid labor and is about 3-4 times higher in cost performance than ordinary alloy steel blades. In short, improving the personnel factor is also extremely critical to the implementation of the glue binding process.
How to use raw materials correctly:
1. Strictly control the temperature of hot melt adhesive
At present, all EVA hot-melt adhesives are used in the production of paper-bound glue binding. In actual use, the use temperature of hot-melt adhesives must be strictly controlled. The general adhesive temperature should be controlled between 150-1 70 ℃, side glue The temperature should generally be controlled at 100 ～ 120 ℃.
This is because when the temperature is too high, although the fluidity and permeability of the hot-melt adhesive are increased, the viscosity and strength of the hot-melt adhesive decrease, and the adhesive layer cannot be formed well on the back of the book, and the bonding strength of the book will also decrease. In severe cases, there will be page breaks, loose pages, broken glue, etc .; if the temperature is too low, the hot melt adhesive will thicken, and its coating will not be very uniform, especially the hot groove adhesive part can not be completely filled in It is very easy to cause pages and loose pages.
The above is mainly about the problem of adhesive backing. The side adhesive also has a great relationship with the temperature change. The temperature is low and the adhesive layer is thick. After the holder, the back of the book is thick, there are defects such as glue overflow, and the temperature is too high. There are defects such as unreliable adhesion and no side glue. These are caused by the change of the fluidity and viscosity of the hot melt adhesive when the temperature changes. Specifically, the temperature is inversely proportional to the viscosity and the fluidity. Proportional to. To analyze the changes in the environment, we must analyze the specific problems, not to make a hard case, but to adjust the temperature of the glue realistically. For example, the temperature of the glue used in winter and summer must be different.
2. Choose the right hot melt adhesive
The hot-melt adhesive should be visually inspected before use. Good hot-melt adhesive should be bright and translucent. After folding it with two hands, there will be no large deformation, and there will be no large deformation after hitting with a small hammer. .
Secondly, the cold and hot test should be carried out. The cold test is mainly placed in an environment of -10-20 ℃. After a period of time, to see whether it has its own toughness and whether it can adapt to the coldness of winter; the thermal test is mainly placed at 40-50 ℃. In the environment, see how hard it is and whether it can adapt to the summer heat.
Finally, the specific gravity test is carried out. A simple method is to add hot-melt adhesive to the graduated measuring cup. Then add water and measure different volumes and weights to find the specific gravity. Practice has proved that when the result of the hot melt adhesive specific gravity test is 0.7-0.72 tons / cubic meter, the effect is better, and the hot melt adhesive formulation is more reasonable.
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