Hardcover Shell Warping Analysis Of The Causes And Solutions
Hardcover shell causes warping When the leaflet materials
, semi-finished and finished products of water content changes, relative to their edges perpendicular to each other naturally produced by bending deformation is called the warp. Coated surface after polishing or printed sample, relative to a center line of the natural bending deformation generated is called curling. Cover cardboard shell warping will produce hardcover inconvenience, and hardcover books will also warp the shell shell shell processing and a letter to bring difficulties, and significantly lower for the case of the hot stamping process quality and Casing automatic part of the reliability of supply for the case, which greatly affect the appearance of quality books.
Common shell is a hardcover book with a different thickness and different mechanical properties of the cover material, cardboard and glue multi-layer composite material composition. Hardcover shell warping is due to the nature of the composition of books of different shell materials, changes in external conditions, internal stress and other factors may cause changes in different degrees of change in shape; for the same material and different and subject to the direction of The shrinkage rate of different, generally speaking, the longitudinal (along wire) shrinkage rate is high, a small transverse shrinkage. Cover materials and board is expected to open when the vertical and horizontal lines in the inappropriate use will result in warping; book the overwhelming majority of absorbent material and shell material, together with paper, especially the cardboard thickness and uniformity of inconsistencies in the moisture, drying, storage process, the book changes in water content within the shell will cause deformation, resulting in warpage.
Shell in the book production process, when the cover material and cardboard layer adhesion, due to absorption of a layer of water, to reduce internal stress, which for the case to maintain balance. But hard permeable cover material (such as cloth), dry, most of the water only in the shell layer along the distribution of the book, so, board of gluing surfaces prior to non-gluing surface drying shrinkage. Board surface due to the non-gluing the role of water in the internal force of a small state, can not balance the cover material, glue, and gluing surface contraction. So, book case to the contraction of the surface layer of large bending, resulting in book case made Alice. In a book written before the formation of core-shell nested with the book will also appear after the warping phenomenon. This is because the book is between the shell and ring lining bonded with water-soluble adhesive, the book has a different shell material in the thickness of each layer and the water content, different strength and contraction rate, and therefore determines the shrinkage of these materials have different degree of stress and warpage. As the mouth into the book provides easy access with the outside world, while another's back office support materials, which layer dryness, its water only distributed along the three sides of incision or by the book outside the core absorption. So smooth shell in a book written after the Qi Qiao, the two cut corners in the most obvious.
Prevent warping method of shell books
(1) with a hot drying methods
To evaporation within the board to improve its resistance to deformation, but also can make the surface smooth and almost the entire board.
(2) use of high-quality cardboard
Tight or loose cardboard structure, is under water, resulting in ability to resist deformation the size of the important factors. Dense texture has been produced abroad, in any case and subject to cross-cutting, high-quality cardboard, so that board up in the deformation consistent with the parties.
Hardcover Shell Warping Analysis Of The Causes And Solutions
By: viedy
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