The correct operation of paperback binding technol

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The correct operation of book paperback binding process

Book paperback binding in some fields with a strong sense of society, the level of the binding process operator is directly related to the stability of the quality of the binding product, so the skill training of the operator is very important, so that the operator should fully understand the performance, operation procedures, maintenance principles and some methods to solve practical problems of the binding equipment. It can take the form of symposium to exchange and learn from each other, constantly summarize experience, and gradually systematize and institutionalize. For example, if the milling back knife on the binding coupling line is used for a long time, the paperback binding book will have quality problems such as ridges and uneven gluing. Practice has found that sharpening the knife once every two weeks will effectively avoid the above situation; Another example is that when cutting wrapped semi-finished products, due to continuous cutting, hot melt adhesive is easy to stick to the blade. When installing the knife, gently coating a layer of silicone oil can effectively avoid the above situation and ensure the cutting quality

in addition, 1/2 overlapping conveyor belts should be used on the adhesive binding coupling line to effectively increase the condensation time. Generally, the time from gelatinization to three side knife cutting machine cutting should not be less than 3 minutes, so as to ensure the quality. Of course, when using the new change-over switch, it should be turned to the "loading" position. The material is also a factor to improve efficiency and ensure quality. For example, the use of steel blade reduces ineffective labor to a great extent, and it is about 3-4 times higher than ordinary alloy steel blade in cost performance. In short, the factor of improving personnel is also very critical for the implementation of the adhesive binding process

how to use raw materials correctly:

1. Strictly control the temperature of hot melt adhesive

at present, all EVA hot melt adhesive is used in the production of paperback adhesive binding. In actual use, the use temperature of hot melt adhesive must be strictly controlled. Generally, the temperature of back glue should be controlled between 150-170 ℃, and the temperature of side glue should be generally controlled between 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 are reduced, and the adhesive layer cannot be formed on the back of the book well, and the bonding strength of the book will also be reduced. When Yan ta talks about it, there will be phenomena such as page falling, scattered pages, and glue breaking; If the temperature is too low, the hot melt adhesive will thicken, and its coating will not be very uniform. In particular, the hot melt adhesive cannot be completely poured into the slotting part, which is very easy to cause page falling and scattering

the above mainly refers to the problem of back glue. The side glue is also closely related to the change of temperature. The temperature is low, the glue coating layer is thick, the back of the book is thick after passing through the holder, there are defects such as glue overflow, and the temperature is too high, there are defects such as weak adhesion and no side glue. These are formed because the fluidity and viscosity of the hot melt adhesive change when the temperature changes. Specifically, the temperature is inversely proportional to the viscosity, In direct proportion to liquidity. For the change of the environment, we should analyze the specific problems, not copy mechanically, but adjust the glue temperature realistically. For example, the glue temperature used in winter and summer must be different

2. Select the appropriate hot melt adhesive

the hot melt adhesive should be visually inspected before use. A good hot melt adhesive should be the film bright, and the translucent industry is the guarantee. There will be no large deformation after folding back and forth with two hands, and there will be no large deformation after hitting with a small hammer

secondly, the cold and hot tests should be carried out. The cold tests are mainly placed in the environment of -10-20 ℃. After a period of time, we should see whether it has toughness and can adapt to the cold in winter; The thermal test is mainly to put it in the environment of 40-50 ℃ to see how well it solidifies and whether it can adapt to the heat of summer

finally, the specific gravity test is carried out. The simple method is to add hot melt adhesive into the graduated measuring cup, and then add water to measure different volumes and weights to calculate the specific gravity. Practice has proved that the specific gravity test result of hot melt adhesive is 0 At 72 tons/cubic meter, the application effect is better, and the formula of hot melt adhesive is also more reasonable

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