Analysis and solution of the blanking of the adhesive backing layer
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The backing of the book backing layer is mainly manifested by the obvious honeycomb-shaped small holes and air bubbles at the ends of the head and the foot of the book, and the back of the book is pressed to have a convex and concave feeling. The main reasons for these quality problems are:
1The milling backing knife is not sharp, and the gap between the milling backing knife and the inner wheel of the two squeeze wheels is too large, so that the book has a convex edge at the end of the book core during the milling back process, resulting in uneven back.
2 The height of the upper rubber wheel is improperly adjusted, so that the glue layer is unevenly glued. When the rubber wheel is too high, the back of the book is squeezed into a trumpet shape, and the rubber wheel is too low, so that the rubber wheel lacks a certain pressure on the back of the book, and the glue is difficult to apply evenly.
3 improper adjustment of the molding mechanism, if the molding mechanism is too high, the book will be glued to the top of the book. If the cover is too low, the cover and the back of the book will not be bonded, which will cause the book backing layer to be empty.
The troubleshooting method is:
1 Check whether the milling backing knife is sharp. Adjust the clearance between the inner wheel of the squeeze wheel and the milling backing knife, which should be between 0.1 and 0.15mm.
2 Adjust the thickness of the rubber wheel and the rubber layer.
3 Adjust the height of the supporting mechanism, which should be adjusted according to the thickness, hardness and hardness of the book cover paper.