Hot Melt Binding Process Quality Management (2)

In order to reduce paper dust, the cutter head can be adjusted to the direction of slightly inclined front milling. The clearance between the back edge of the milling cutter and the clipper is 1.3 mm, the reverse is 1.9 mm, and the inclined buckle is adjusted. ) With the bottom edge of the book holder is 0.05-0.10 mm. The slots that are milled have a slot depth of 0.1-1.2 mm and back milling depths of 0.5-0.6 mm. The milled book is slightly edged and does not affect the quality and strength of the book. In the operation, special attention should be paid to maintaining the sharpness of the milling cutter, reducing the gravitational force of milling, and ensuring the same depth of the milling groove.
The bookbinding and binding machine milling book north and groove structure and glue binding linkage motive are the same, but the machine's matching precision and adjustment have certain problems to be improved.
(1) The adjustment gap between the milling back cutter and the cutter holder shall not be greater than 0.15-0.30 mm, and the matching milling cutter mouth may be welded with cemented carbide.
(2) Slotting knife to change the gap between the cemented carbide type blade groove and the knife is about 0.10 mm on each side. Special attention should be paid to the fastening plane of the original milling cutter's round shank processing to prevent the cutter head from becoming a man.
(3) Adjust the entire milling cutter assembly (in the plane of the milling cutter head) to the bevel of the bottom edge of the holder (the milling cutter is not reverse-milled), so that the milled groove is unidirectional, increasing Slot milling quality reduces secondary wear on the cutter.
After the test, the initial tensile strength and the bond strength of the book pages required for the rubber staple are reached. The pitch of the grooves is 3-5 mm, the depth of the grooves is 1.0-1.5 mm (the deepest depth of the disc machine is 1.0-1.2 mm), The shape is ^ type, its angle is about 60 degrees, and the tip of the arc is about RO.15 millimeters (which is good for the glue resistance and tensile strength of the proof sheet). In addition, pay attention to clean up the use of book back confetti brush. Cooperator Brushman must pay attention to always maintain a good working condition. Now the brush on the disc machine has basically not played the role of clearing the paper scraps. Must improve. A short bristle brush can be added to the right side of the protective shield of the cutterhead (removing one brush surface from the secondary platform plate can be widened). The back of the book is passed through the brush surface (there is a certain pressure between the back and the brush surface) to maximize the paper Chips cleared.
In order to ensure the book backing and milling groove quality, the groove depth and spacing must be maintained at all times. To this end, our measure is: Each factory is required to process two standard samples of milled back and milled vinegar on each bookbinder. After approval, it will be returned to the machine and used as an operating machine to adjust the permanent reference of the machine. In the same way, the quality of the milled book backs and milling slots was taken as the quality inspection sample and used as a control sample.
Third, the use of hot-melt adhesives and the book's bond strength from the Big Book of withdrawal and testing found that the use of glue temperature and the thickness of the adhesive layer, the viscosity of the glue (balance consistency) is closely related. The viscosity index of the rubber is more important than the strength of the glue. The characteristics of the hot melt adhesive are that the higher the temperature, the lower the viscosity of the glue, the better the fluidity, and the stronger the permeability of the pages, when the glue and the page are integrated, The book reaches its maximum tensile strength.
Due to the above characteristics of the hot melt adhesive, the thickness of the book back adhesive layer also changes with temperature. In the operation, it is required to control the temperature of the glue well, and to compensate the amount of glue in a pre-melting manner. Although the pre-mold glue cooker is large, it must be added less frequently, and the temperature should be kept stable.
When adjusting the backing layer thickness, the thickness of the adhesive layer should be measured when the normal operation of the machine reaches the upper limit temperature. If the thickness of the adhesive layer is measured at a low temperature, the required adhesive layer thickness cannot be achieved when the temperature rises.
The use temperature of hot melt adhesive should not exceed the temperature range provided by the manufacturer. Our results of six kinds of hot-melt adhesives aging test at 48°C for 48 hours show that: with good quality hot melt adhesives, the color, viscosity, and tensile strength of the adhesive change little; poorer quality adhesives darken the color and form coke skins on the surface. Infusible material, increased viscosity. Good quality (heat stability) of hot melt adhesive, the use of temperature (according to temperature changes) can be used in the range of the middle limit or the maximum temperature value, the temperature is rather high not lower. In operation, the temperature must be controlled within the minimum fluctuation range. For the control, the temperature controller with low sensitivity should be replaced in time. The MY-01B digital thermometer has a measurement range of 50-300 degrees Celsius. As the normal temperature and temperature Controller monitoring and winter book and ambient temperature determination. After testing multiple gluebinder machines, it was found that the actual temperature of the plastic pot and the display error of the thermostat were less than ten degrees, many times more than tens of degrees, and the error of the pre-melt glue pot was as much as 70 degrees Celsius. Special attention should be paid to winter books when they are stored at low temperatures. They must be brought into the workshop in advance and used only when the pages are adapted to the temperature of the workshop. Otherwise, the low temperature of the book will affect the permeability of the glue.
Fourth, supporting the process of supporting measures The entire "prepress, printing," the economics of the process, the final must rely on the binding of finished products to reflect the quality of the processes, the process must be subject to the binding process requirements in order to play glue binding process The greatest benefit. To this end, we have taken the following measures.
1, for rubber book staple length, cover caused by the drag and a large number of downtime problems, changed the long-term paper size used, cover paper from 880 mm to 890 +2-0 mm, 787 mm changed to 795 +2 -0 mm. The web width will be changed from 880mm to 875+0-2mm and 787mm to 780+0-2mm so that the back cover will grow to about 3mm, which solves the dragging problem.
2. Improve the paper quality of the cover and use all wood pulp paper to ensure the precision of printing and the cutting of the cover.
3, cover cutting accuracy is directly related to the quality and economic benefits of glued products. With the current process operation, after the cover is cut, it is impossible to check which rules are correct and which ones cannot be used. Only after the rubber bookmaker finishes the finished product can the word spine be randomly picked out, resulting in great waste. For this purpose, we designed the cover-synthesized table paper, and made a 0.6-mm cutting line at each cover's breaking point. The 0.10-millimeter thread ends at both ends of the thick line were the center line of the cutting tool (the thick and thin line was only on the black plate. ) Any mark that can be cut to the black line has a black mark on the edge of the paper edge. Any mark that is not marked is unruly and can be singled out beforehand. In addition, there are six 0.10 mm lines extending to the edge of the printing paper (only on the black plate) on the edge of the paper. The first is to check whether the push-pull rules in the printing process are accurate and consistent, and to pick out the irregular cover. deal with. Special attention should be paid to the accidental adjustment of the upper and lower knife of the paper cutter. The amount of cutting must be reduced. It must not be more than half a ream. Careful operation is required. The actual use of good results, reducing the rework waste loss.
4. The white paper cutting on the temple surface must be strictly controlled by cutting the vertical angle. This is the basis of the entire cover printing and cutting accuracy, and it is also the most critical. The nine German Boracher machines we introduced specifically cut white and cover covers.
5. Developed the “Technical Requirements and Testing Methods for Hot Melt Adhesives in Paper-backed Books and Periodicals of Shandong Publishing Co., Ltd.” as the glue-binding process standard, and achieved standardized management, which enabled the glue-binding process and product quality to become more and more perfect, and further promoted and popularized.