The level of the Bookbinding Glue binding process operator is directly related to the stability of the glue-binding product quality, so it is very important for the operator's skill training to allow the operator to fully understand the properties, operation procedures and maintenance principles of the glue-binding equipment. Some ways to solve practical problems. In the form of forums, they can communicate with each other, learn from each other, and sum up their experience, gradually and systematically. For example, in the glued-lined milling cutter, if it is used for a long period of time, there will be quality problems such as ridges, uneven glue, etc., in practice, it will be found that grinding is performed once in two weeks. This will effectively avoid the occurrence of the above-mentioned situations; for example, when the packaged semi-finished products are cut, the hot melt adhesive is easily stuck on the blades due to continuous cutting, and a layer of silicone oil can be applied to the blade to effectively avoid the above situation. , guarantee cutting quality.
In addition, more than 1/2 overlapped conveyor belts should be used for glue-binding line, which can effectively increase the condensation time. Generally from the beginning of the coating to the trimming of the three-side knife, the time 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 stainless steel blades reduces the uselessness of work to a great extent, and is about 3-4 times more expensive than ordinary alloy steel knives. In short, improving the personnel factor is also crucial to the implementation of the glue-binding process.
How to use raw materials properly:
1. Strictly control hot melt temperature
At present, all EVA hot melt adhesives are used in the production of adhesives for paper binding. The actual use temperature of the hot melt adhesives must be strictly controlled. Generally, the adhesive temperature should be controlled between 150-1 70°C. The temperature should generally be controlled at 100 to 120°C.
This is because when the temperature is too high, although the flowability and permeability of the hot melt adhesive are increased, the viscosity and strength of the hot melt adhesive are decreased, and the adhesive layer is not formed on the back of the book very well, and the binding strength of the book is also reduced. In severe cases, page breaks, loose-leafing, broken glue, etc. may occur. If the temperature is too low, the hot-melt adhesive will thicken and the coating will not be uniform. In particular, the hot-melt adhesive cannot be completely poured into the slotting part. Can easily cause page breaks and loose pages.
The above mainly refers to the problem of adhesive, the side adhesive also has a great relationship with the temperature change, the temperature is low, the adhesive layer is thick, after the bracket is clamped, 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 weak bonding, no Side Glue, etc. These are due to changes in the fluidity and viscosity of the hot melt adhesive when the temperature changes. Specifically, the temperature and viscosity are inversely proportional to the fluidity. It is proportional. For the specific changes in the environment to analyze the specific issues, can not be impersonated, to adjust the actual glue temperature, such as the glue temperature used in winter and summer is certainly a difference.
2. Choose the right hot melt adhesive
Before the use of hot melt adhesive first visual inspection, good hot melt adhesive film should be bright, semi-transparent, with two hands back and forth after folding will not have a large deformation, with a small hammer will not be too much deformation .
Secondly, cold and heat testing should be carried out. Cold testing is mainly carried out at -10-20°C in environmental cattle. After a period of time, we can see whether it has its own toughness and can adapt to the cold in winter; thermal inspection is mainly conducted at 40-50°C. In the environment, see how solid it is and whether it can adapt to the summer heat.
Finally, the proportion test is performed. The simple method is to add hot melt adhesive to the graduated measuring cup. Then add water and measure the volume and weight to determine the specific gravity. Practice has proved that when the hot melt adhesive specific gravity test result is 0.7-0.72 tons/cubic meter, the use effect is better, and the hot melt adhesive formula is also reasonable at this time.
