First, the issue of paper fiber
Digital printing
Commonly used narrow width 18-inch web, four layout head-to-head layout printing. Due to the limited width of the paper, the orientation of the paper fibers leaves room for folding. Similarly, a typical sheet-fed laser printer is best when printing a 9-in. x 12-in. (or 9-in. x 14-in.) two-page head-to-head typesetting product. Unless the digital printer is familiar with the glue-binding process and knows that the direction of the paper fiber should be parallel to the direction of the spine, he must be: what kind of paper is used in the paper bucket, and it does not consider the fiber orientation of the paper. This means It is very likely that the direction of the paper fibers is perpendicular to the spine, which is very troublesome for folding and gluing.
Today's sheetfed printers do not care much about whether the direction of the paper fibers runs parallel or perpendicular to the direction of the paper feed. Therefore, the printer knows that the layout of the printing layout matches the direction of the paper fibers.
The situation of the web printing press is a bit more complicated. The paper feeding direction cannot be changed. Only the orientation of the layout can be grasped so that the direction of the paper fibers can be considered as parallel as possible to the spine.
Second, the book's "foliage" issue
Books that are digitally printed on sheet-fed paper and then bound (glued or hard-packed) often have a "foliar" phenomenon on the periphery of their pages. This is mainly because the paper is quickly dried when it passes through the heating roller of the printing press, causing unevenness in the internal stress of the paper. Other reasons are: improper preservation of paper before printing, excessive water content in the paper, and dampness during printing and binding. The orientation of paper fibers perpendicular to the direction of the spine can also cause such problems.
To avoid this problem, the binder must coordinate with the printer to keep track of the production process during the printing and transport to the binding plant; create relatively stable and controllable environmental conditions.
In general, the “foliage†phenomenon of a book page will gradually disappear within one week after binding, but in today’s fast-paced era of “on-demand printingâ€, people need to wait and wait, who has the patience to wait for so long. ?
Third, the fastness of binding
Most sheetfed digital presses use toner instead of traditional inks. When the toner passes through the heating roller, it is melted by heat and the ink is fixed on the paper surface. In the process of hot-melting, there is a small amount of solvent released. Although the amount of such solvents is small, they are all adsorbed on the paper surface and affect the adhesion of the binding glue and the paper.
The fastness of binding is sometimes related to the fastness of the film. Digitally printed book covers are often colored. Because of the small number of prints, it is also printed using a color toner digital printer. Toner is less sticky to coated paper, and toner peeling is often seen at the turn of the spine.
In general, this short version of the business is not suitable for surface coating and lamination, because the surface of the toner is poorly adherent, slightly crumpled, and the plastic film and the paper are separated. Usually, the film is used only for the cover of a book printed with traditional ink. If the customer insists on the requirement, it is more reasonable to cover the outside of the cover. This will not cause the book block and cover to fall off.
the solution
What can be done to solve the above digital print binding problems?
1. Adjust the hot melt temperature of the toner of the digital color printer to achieve the best adhesion.
2. Use appropriate cover materials. Now that the cover material is varied, try and use a material that has the strongest affinity with the toner. Usually this material has been surface treated and coated with a layer of specially adsorbed toner.
3. Surface treatment of plastic film material itself to improve its adsorption with toner.
Digital printing
Commonly used narrow width 18-inch web, four layout head-to-head layout printing. Due to the limited width of the paper, the orientation of the paper fibers leaves room for folding. Similarly, a typical sheet-fed laser printer is best when printing a 9-in. x 12-in. (or 9-in. x 14-in.) two-page head-to-head typesetting product. Unless the digital printer is familiar with the glue-binding process and knows that the direction of the paper fiber should be parallel to the direction of the spine, he must be: what kind of paper is used in the paper bucket, and it does not consider the fiber orientation of the paper. This means It is very likely that the direction of the paper fibers is perpendicular to the spine, which is very troublesome for folding and gluing.
Today's sheetfed printers do not care much about whether the direction of the paper fibers runs parallel or perpendicular to the direction of the paper feed. Therefore, the printer knows that the layout of the printing layout matches the direction of the paper fibers.
The situation of the web printing press is a bit more complicated. The paper feeding direction cannot be changed. Only the orientation of the layout can be grasped so that the direction of the paper fibers can be considered as parallel as possible to the spine.
Second, the book's "foliage" issue
Books that are digitally printed on sheet-fed paper and then bound (glued or hard-packed) often have a "foliar" phenomenon on the periphery of their pages. This is mainly because the paper is quickly dried when it passes through the heating roller of the printing press, causing unevenness in the internal stress of the paper. Other reasons are: improper preservation of paper before printing, excessive water content in the paper, and dampness during printing and binding. The orientation of paper fibers perpendicular to the direction of the spine can also cause such problems.
To avoid this problem, the binder must coordinate with the printer to keep track of the production process during the printing and transport to the binding plant; create relatively stable and controllable environmental conditions.
In general, the “foliage†phenomenon of a book page will gradually disappear within one week after binding, but in today’s fast-paced era of “on-demand printingâ€, people need to wait and wait, who has the patience to wait for so long. ?
Third, the fastness of binding
Most sheetfed digital presses use toner instead of traditional inks. When the toner passes through the heating roller, it is melted by heat and the ink is fixed on the paper surface. In the process of hot-melting, there is a small amount of solvent released. Although the amount of such solvents is small, they are all adsorbed on the paper surface and affect the adhesion of the binding glue and the paper.
The fastness of binding is sometimes related to the fastness of the film. Digitally printed book covers are often colored. Because of the small number of prints, it is also printed using a color toner digital printer. Toner is less sticky to coated paper, and toner peeling is often seen at the turn of the spine.
In general, this short version of the business is not suitable for surface coating and lamination, because the surface of the toner is poorly adherent, slightly crumpled, and the plastic film and the paper are separated. Usually, the film is used only for the cover of a book printed with traditional ink. If the customer insists on the requirement, it is more reasonable to cover the outside of the cover. This will not cause the book block and cover to fall off.
the solution
What can be done to solve the above digital print binding problems?
1. Adjust the hot melt temperature of the toner of the digital color printer to achieve the best adhesion.
2. Use appropriate cover materials. Now that the cover material is varied, try and use a material that has the strongest affinity with the toner. Usually this material has been surface treated and coated with a layer of specially adsorbed toner.
3. Surface treatment of plastic film material itself to improve its adsorption with toner.
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