Control of raw materials  Analysis On Key Points Of Hardcover Processing Control Of Books And Periodicals

1. Use of cardboard   Analysis On Key Points Of Hardcover Processing Control Of Books And Periodicals

        The book cover cardboard specially produced for hardcover books and picture albums shall be selected, and the storage time shall be more than half a year. The shrinkage of this kind of paperboard is small, which can reduce the possibility of deformation when making book sealing shell. Analysis On Key Points Of Hardcover Processing Control Of Books And Periodicals

        During the cutting of the paper cutter, 2mm allowance shall be added on each side of the finished product size. After the rough sample is drawn, the cutting beveled edge shall be processed into a smooth edge to eliminate the beveled edge caused by single knife cutting and reduce blistering and edging skew after edging. The length of the paperboard is the length of the book block plus 6mm, and the width is the width of the book block minus 2mm.Analysis On Key Points Of Hardcover Processing Control Of Books And Periodicals

2. Use of medium diameter paper Analysis On Key Points Of Hardcover Processing Control Of Books And Periodicals

        Generally, 80-240g / m2 paper is selected. If the paper is cut in the longitudinal direction and used as the length of medium diameter paper, it can prevent the uneven back after shrinkage. The length of medium diameter paper is equal to the length of book cover paper, and the width is the back arc length after rounding and ridging (square endorsement is the back width plus 2 times the paperboard thickness).

3. Use of auxiliary materials  Analysis On Key Points Of Hardcover Processing Control Of Books And Periodicals

(1) The plug cloth shall be starched with starch first. When sticking the plug cloth, the position shall be correct without skew; The edges and corners of the plug cloth shall be exposed outside the cut at the upper and lower ends of the book block and parallel to the cut; After pasting, it shall be straight and firmly bonded with the same margin on both sides. Its length is 1mm longer than the back width.

(2) The gauze shall be pulp gauze. Its length is 22-26mm shorter than the book block. The width is 40mm thicker than the book block.

(3) The book back paper generally uses 100-120g / m2 offset paper to make the longitudinal grain along the upper and lower parts of the book back to facilitate segmentation.Analysis On Key Points Of Hardcover Processing Control Of Books And Periodicals

(4) The book block belt uses a 5-8mm wide silk ribbon, with the diagonal length of the book block as the ribbon length, which is generally pasted at 15mm on the back of the book.Analysis On Key Points Of Hardcover Processing Control Of Books And Periodicals

4. Use of sealing fabric

       The size of the full cloth of lacquer paper required by the customer is: the length is the length of the paperboard plus 30mm, the width is twice the width of the paperboard plus the width of the medium diameter paper plus 44mm (the binding size is 15mm).

       After the material is prepared, the shell is made after hot printing, so as to prevent the uneven paperboard due to glue brushing after the shell is made, resulting in insufficient hot trace, flower plate, wild gold and brightness.Analysis On Key Points Of Hardcover Processing Control Of Books And Periodicals

Control of book block processing

       The structures of various book blocks are different, and the modeling processing methods and steps are not exactly the same, but the basic processing such as book back brush glue, adhesive gauze, adhesive plug cloth, adhesive book back paper, etc. is basic. However, if it is more than 100%, it will not be able to cover the whole process? Analysis On Key Points Of Hardcover Processing Control Of Books And Periodicals

       Because the book block pressing can eliminate stress, close the needle, make the back of the book flat and at right angles, press the root of the book block and the broken edge of the book block of folding products, so as to prevent steps after the book is completed. 

       And each book is subject to general inspection at this time, check more and less posts, and make inspection responsibility marks on the back of the book to ensure that there are no wrong posts in the book block.Analysis On Key Points Of Hardcover Processing Control Of Books And Periodicals

       When flattening, the book block behind the lock line shall be bumped, leveled and aligned, and the pressure shall be appropriate to make the firmness of the book block consistent, that is, to ensure the consistent thickness of the back of the book, and to prevent shrinking, pressing and rolling.Analysis On Key Points Of Hardcover Processing Control Of Books And Periodicals

2. Apply glue for the first time

      After the book block is bound, the back of the book shall be painted at intervals with thin adhesive materials to form a layer of flexible film to basically shape the book block, so as to avoid mutual dislocation in the next process and complete the first glue brushing.Analysis On Key Points Of Hardcover Processing Control Of Books And Periodicals

3. Cutting books

Three side cutting requires books to be square and small cutting error.

4. Rounding

       The standard arc on the back of hardcover books should take the thickness of the book block as the diameter, and the center angle of the arc on the back of the book is about 130 °.Analysis On Key Points Of Hardcover Processing Control Of Books And Periodicals

      However, the thicker the book block, the smaller the circular potential, and the thinner the book block, the greater the circular potential.Analysis On Key Points Of Hardcover Processing Control Of Books And Periodicals

         In order to unify the arc size of the processed book block, the arc length of each book should be compared with the autocratic mold arc to ensure that the arc length and the floating mouth of the subsequent process are consistent. When manually raking the circle, you can use a steam iron to fold the back of the book upward, put a towel, Analysis On Key Points Of Hardcover Processing Control Of Books And Periodicals

      and iron it back and forth with steam for several times to soften the back glue, and then knock it with a wooden hammer. This method can prevent the moisture, wrinkle or adhesion of the insert of coated paper, and improve the binding quality.Analysis On Key Points Of Hardcover Processing Control Of Books And Periodicals

Finally, according to the quality requirements, the work of silk tape sticking and “three sticking” is completed.Analysis On Key Points Of Hardcover Processing Control Of Books And Periodicals

Control of making book cover

        When making the book seal shell, first adjust the size of the mask frame, and mark the back width on the upper stop gauge to ensure that the words on the back are centered. Analysis On Key Points Of Hardcover Processing Control Of Books And Periodicals

      When putting in the paperboard, the paperboard should lean to the left and right sides to overcome the errors existing in the cutting of the paperboard and ensure that the size of each book seal shell is consistent after it is finished.Analysis On Key Points Of Hardcover Processing Control Of Books And Periodicals

        After the book seal shell is completed according to the quality requirements, the edges of the four sides shall be scraped with bamboo to prevent the edges from being loose and empty. Analysis On Key Points Of Hardcover Processing Control Of Books And Periodicals

        Then stack the two pairs of seals of the two book covers, and pad the paperboard with the same thickness as the book cover at the middle seam to press down the middle diameter edge of the cover.Analysis On Key Points Of Hardcover Processing Control Of Books And Periodicals

       Each pile of newly finished book covers shall be pressed once under the control of pressure, and then the covers shall be separated, the cushion strip shall be taken away, leveled and stacked in one direction, and heavy objects shall be pressed on it to prevent warpage. Analysis On Key Points Of Hardcover Processing Control Of Books And Periodicals

      Before sealing the shell, the shell shall be erected and dried in the shade to make it dry naturally. In the plum rain season, preservatives should be added to the shell glue to prevent mildew when it is dried in the natural shade.Analysis On Key Points Of Hardcover Processing Control Of Books And Periodicals