Books and magazines wireless glue binding process has become the mainstream of modern binding technology innovation and development with its good quality and significant advantages of production efficiency. It is widely used in binding magazines and books. Therefore, how to improve the quality of offset products is a question worthy of discussion in the printing industry.
First, the poor milling and backing cause blemishes and page breaks. When milling and backing, only the ridges of the signatures are all milled into a single page to allow the glue to penetrate into every page. When the amount of back milling is not enough, there are some cases where the signatures are slightly missing. The individual books or one end of the book core is neat, and the milling back amount of the three-fold signature is adjusted to 2-3mm, and the four-fold signature is 2.5. -3.5mm to ensure that the signatures can be milled to prevent page breaks and loose pages;
2. The problem of page dropping and loose-leaf quality caused by inconsistent milling on both sides. When the spine ends, the amount of milling on both sides of the foot is not the same, so that while the signature does not mill the spine on the spine, colloids can not penetrate into the bound pages, often appear on one side of the page, page faults. When the level of both sides of the tablet is inconsistent, the cutters are blunt, the signatures are not sloppy, the folding is skewed, the spine is not flat, the books are loosened, and the difference between the thickness of the brush on both sides of the book is likely to cause inconsistent milling on both sides. It should be from the equipment. To adjust to the process - to conduct a serious check in order to prevent the occurrence of such failures;
3, book set milling back caused rupture. When milling and backing, several lateral gaps appeared at the bookbinding site, and a few cracks were visible when the cover was opened. The main causes of this quality problem are: the side of the clamping plate on the milling cutter head wears and becomes concave, which does not achieve the function of protecting the spine and the setting mouth, so that when the milling back cutter works, the signature setting part It is stamped and deformed until it cracks. In addition, the back edge of the milling cutter becomes blunt and the amount of back milling is too much, which can easily cause cracking of the opening. Therefore, if the splint is worn, it should be repaired and repaired with a sharpening machine. If it is a blunt knife, it should be used after sharpening the edge of the blade. If the amount of milling back is too high, it should be adjusted to a small extent as necessary to eliminate the failure of the set crack.
4, the milling back spine is not smooth. The occurrence of ridge spins, unevenness, beveled edges (face and bottom), and looseness of loosening caused by large book-shoe gaps, looseness of milling cutter backs, bluntness of cutting edges, etc. have a certain relationship. Take corresponding measures to eliminate loose parts and sharpen the knife edge to ensure even and stable milling back.
Second, the quality problems caused by improper use of hot melt glue 1, lack of glue caused by the book block bond is not strong. Whether or not you can bond every page of the entire book core firmly depends on the degree of penetration of the gum and the adhesive and thickness. If the amount of adhesive applied is insufficient, the glue cannot fully and uniformly penetrate into the various notches on the back of the book. When the glue on the back of the book is also obviously thin, it will inevitably affect the fastness of the glue of the book block. Therefore, according to the thickness of the book block, the glossiness of the paper, etc., it is an important part of improving the bond fastness of the book block to rationally adjust and grasp the coating amount of the primer. If the thickness of the book block is less than 8mm, the thickness of the backing glue shall not be less than 0.6mm; if the thickness of the book block is greater than 8mm, the thickness of the back glue shall be adjusted within the range of 0.7-2mm as appropriate;
2, poor glue caused by the book block bond is not strong. Process practice shows that the quality of hot-melt adhesives also directly affects the fastness of bookbinding. Some of the poor books in the market are not very durable and cannot withstand repeated readings. Degumming and loose-leaf pages often occur, and readers have great opinions. The reason for its quality is not due to the lack of milled backs, but rather to poorly glued pages that are not firmly bonded. This is worth mentioning is that, good quality hot melt adhesives, often have to use a variety of composition ratio, high technical content, wide applicability, can be used for a variety of paper glue binding, bonding effect is also good. The low-grade glue is as much as 1 times cheaper than the good glue, and its technical content, composition and high-grade glue are somewhat different. Obviously, it is not appropriate to use a low grade adhesive to set a thick book. In addition, due to the long-term deposition of glue in the glue pool, the glue contains paper powder, paper dust, char, and blistering caused by moisture, which will cause the viscosity of the glue to decrease and the glue to be uneven. Another reason for the book's loose and dropped pages. Therefore, a reliable hot melt adhesive should be used, and the plastic pool should be cleaned at a proper time to replace the new one to ensure the quality of the glue.
3, improper temperature control to affect the gum. Good temperature control is an important part of properly using hot melt adhesives. If the glue temperature is too high or too low, it can easily affect the effect of glue. For example, when the glue temperature is too high, the fluidity of the glue is good, but the blistering is more severe and it is easy to cause drawing defects; if the glue temperature is too low, the glue is not completely melted. The poor fluidity of the glue is not conducive to achieving a uniform and sufficient adhesive bond, and the viscosity of the glue is also poor. Therefore, the control of the glue temperature cannot be generalized and it should be reasonably grasped according to the temperature of the production environment and the softening point of the rubber. Different manufacturers, different brands of hot-melt adhesives, different composition and performance, there must be differences in softening point. The softening point of the glue is high, and the glue temperature must be higher. The low temperature requires that the glue temperature needs to be improved, and the fluidity of the glue and the actual adhesive effect are used as the basis for the glue temperature control. The recommended operating temperature in the product description is for reference only and must not be physically applied. The author believes that the glue temperature should be adjusted accordingly to ensure smooth glue flow and good viscosity as a prerequisite for glue temperature adjustment.
Third, the quality problems caused by the bad package, set the mouth overflow phenomenon. When the primer is thicker and the glue on the receiving (horizontal) rubber wheel is also large, after the package is wrapped, there will be an overflow phenomenon at the opening. In this regard, the adhesive rubber wheel should be adjusted to appropriately thin the rubber layer on the rubber wheel so as to avoid overflow of glue.
2, the back of the book is a dovetail groove deformation. When the distance between the splint is too large or the package bracket is adjusted too high, the back of the book is deformed by excessive pressure and is often in the form of a dovetail groove, which affects the cutting accuracy, and the spine after being cut is easily crumpled. In this regard, the spacing between the splints should be adjusted so that the splint can grip the back of the book. The height of the pallet should also be adjusted to an appropriate state. Do not over-press the back of the book to avoid back-squeeze deformation of the book.
3, the back of the book presents a circular arc. The right-angled side of the book is the basic requirement for the quality of the book. When the book is straight, one side of the book is arc-shaped or the entire back of the book is arc-shaped, which is caused by several kinds of unfavorable situations. Both ends of the splint are uneven, the distance between the spine indentation line of the cover is too large (inconsistent with the thickness of the book block), the rise of the support plate is too high, and the spacing between the splints is not suitable. These are the sources of the book's back circular deformation, and corresponding measures should be taken to correct it. Can avoid this phenomenon;
4, wrap wrinkles after the package. When the book block is not pressed tightly, there is a loose shape and the dislocation of the splint spacing is not suitable, and it is easy to wrinkle the back of the book. To prevent this quality failure, it is required that the pressure book must be compact, and the spacing between the clamps should correspond to the thickness of the book block after compaction;
5, after the package appeared empty back. Poor fluidity and permeability of the glue, air bubbles and paper scraps in the glue, and lifting of the pallets are not easy. In this regard, the glue temperature should be adjusted to maintain good fluidity and permeability; the edge of the milling cutter should be sharpened and the brush should be adjusted to avoid the paper scraps on the back of the book from entering the glue pool; containing impurities and foaming. The strong glue should clean up and replace the new glue;
6, the cover and book block is not allowed to paste. The process of the book holder is inaccurate, and there is a difference between the front and rear positioning, resulting in the inaccurate position of the cover book, and a difference in the front and rear positioning, resulting in inaccurate positioning of the cover book. In this regard, it should be checked whether the brake device is worn or not, and according to the degree of wear of the brake pad, proper tightening or replacement of new accessories is necessary to ensure the correct positioning of the book holder.
To sum up, as long as we seriously shut down the good operation technology and process technology, and constantly sum up experience in practice, we can better prevent the occurrence of a variety of quality failures, so that product quality and production efficiency have been synchronized to improve. (Kang Qilai) ("Chinese Printing")
First, the poor milling and backing cause blemishes and page breaks. When milling and backing, only the ridges of the signatures are all milled into a single page to allow the glue to penetrate into every page. When the amount of back milling is not enough, there are some cases where the signatures are slightly missing. The individual books or one end of the book core is neat, and the milling back amount of the three-fold signature is adjusted to 2-3mm, and the four-fold signature is 2.5. -3.5mm to ensure that the signatures can be milled to prevent page breaks and loose pages;
2. The problem of page dropping and loose-leaf quality caused by inconsistent milling on both sides. When the spine ends, the amount of milling on both sides of the foot is not the same, so that while the signature does not mill the spine on the spine, colloids can not penetrate into the bound pages, often appear on one side of the page, page faults. When the level of both sides of the tablet is inconsistent, the cutters are blunt, the signatures are not sloppy, the folding is skewed, the spine is not flat, the books are loosened, and the difference between the thickness of the brush on both sides of the book is likely to cause inconsistent milling on both sides. It should be from the equipment. To adjust to the process - to conduct a serious check in order to prevent the occurrence of such failures;
3, book set milling back caused rupture. When milling and backing, several lateral gaps appeared at the bookbinding site, and a few cracks were visible when the cover was opened. The main causes of this quality problem are: the side of the clamping plate on the milling cutter head wears and becomes concave, which does not achieve the function of protecting the spine and the setting mouth, so that when the milling back cutter works, the signature setting part It is stamped and deformed until it cracks. In addition, the back edge of the milling cutter becomes blunt and the amount of back milling is too much, which can easily cause cracking of the opening. Therefore, if the splint is worn, it should be repaired and repaired with a sharpening machine. If it is a blunt knife, it should be used after sharpening the edge of the blade. If the amount of milling back is too high, it should be adjusted to a small extent as necessary to eliminate the failure of the set crack.
4, the milling back spine is not smooth. The occurrence of ridge spins, unevenness, beveled edges (face and bottom), and looseness of loosening caused by large book-shoe gaps, looseness of milling cutter backs, bluntness of cutting edges, etc. have a certain relationship. Take corresponding measures to eliminate loose parts and sharpen the knife edge to ensure even and stable milling back.
Second, the quality problems caused by improper use of hot melt glue 1, lack of glue caused by the book block bond is not strong. Whether or not you can bond every page of the entire book core firmly depends on the degree of penetration of the gum and the adhesive and thickness. If the amount of adhesive applied is insufficient, the glue cannot fully and uniformly penetrate into the various notches on the back of the book. When the glue on the back of the book is also obviously thin, it will inevitably affect the fastness of the glue of the book block. Therefore, according to the thickness of the book block, the glossiness of the paper, etc., it is an important part of improving the bond fastness of the book block to rationally adjust and grasp the coating amount of the primer. If the thickness of the book block is less than 8mm, the thickness of the backing glue shall not be less than 0.6mm; if the thickness of the book block is greater than 8mm, the thickness of the back glue shall be adjusted within the range of 0.7-2mm as appropriate;
2, poor glue caused by the book block bond is not strong. Process practice shows that the quality of hot-melt adhesives also directly affects the fastness of bookbinding. Some of the poor books in the market are not very durable and cannot withstand repeated readings. Degumming and loose-leaf pages often occur, and readers have great opinions. The reason for its quality is not due to the lack of milled backs, but rather to poorly glued pages that are not firmly bonded. This is worth mentioning is that, good quality hot melt adhesives, often have to use a variety of composition ratio, high technical content, wide applicability, can be used for a variety of paper glue binding, bonding effect is also good. The low-grade glue is as much as 1 times cheaper than the good glue, and its technical content, composition and high-grade glue are somewhat different. Obviously, it is not appropriate to use a low grade adhesive to set a thick book. In addition, due to the long-term deposition of glue in the glue pool, the glue contains paper powder, paper dust, char, and blistering caused by moisture, which will cause the viscosity of the glue to decrease and the glue to be uneven. Another reason for the book's loose and dropped pages. Therefore, a reliable hot melt adhesive should be used, and the plastic pool should be cleaned at a proper time to replace the new one to ensure the quality of the glue.
3, improper temperature control to affect the gum. Good temperature control is an important part of properly using hot melt adhesives. If the glue temperature is too high or too low, it can easily affect the effect of glue. For example, when the glue temperature is too high, the fluidity of the glue is good, but the blistering is more severe and it is easy to cause drawing defects; if the glue temperature is too low, the glue is not completely melted. The poor fluidity of the glue is not conducive to achieving a uniform and sufficient adhesive bond, and the viscosity of the glue is also poor. Therefore, the control of the glue temperature cannot be generalized and it should be reasonably grasped according to the temperature of the production environment and the softening point of the rubber. Different manufacturers, different brands of hot-melt adhesives, different composition and performance, there must be differences in softening point. The softening point of the glue is high, and the glue temperature must be higher. The low temperature requires that the glue temperature needs to be improved, and the fluidity of the glue and the actual adhesive effect are used as the basis for the glue temperature control. The recommended operating temperature in the product description is for reference only and must not be physically applied. The author believes that the glue temperature should be adjusted accordingly to ensure smooth glue flow and good viscosity as a prerequisite for glue temperature adjustment.
Third, the quality problems caused by the bad package, set the mouth overflow phenomenon. When the primer is thicker and the glue on the receiving (horizontal) rubber wheel is also large, after the package is wrapped, there will be an overflow phenomenon at the opening. In this regard, the adhesive rubber wheel should be adjusted to appropriately thin the rubber layer on the rubber wheel so as to avoid overflow of glue.
2, the back of the book is a dovetail groove deformation. When the distance between the splint is too large or the package bracket is adjusted too high, the back of the book is deformed by excessive pressure and is often in the form of a dovetail groove, which affects the cutting accuracy, and the spine after being cut is easily crumpled. In this regard, the spacing between the splints should be adjusted so that the splint can grip the back of the book. The height of the pallet should also be adjusted to an appropriate state. Do not over-press the back of the book to avoid back-squeeze deformation of the book.
3, the back of the book presents a circular arc. The right-angled side of the book is the basic requirement for the quality of the book. When the book is straight, one side of the book is arc-shaped or the entire back of the book is arc-shaped, which is caused by several kinds of unfavorable situations. Both ends of the splint are uneven, the distance between the spine indentation line of the cover is too large (inconsistent with the thickness of the book block), the rise of the support plate is too high, and the spacing between the splints is not suitable. These are the sources of the book's back circular deformation, and corresponding measures should be taken to correct it. Can avoid this phenomenon;
4, wrap wrinkles after the package. When the book block is not pressed tightly, there is a loose shape and the dislocation of the splint spacing is not suitable, and it is easy to wrinkle the back of the book. To prevent this quality failure, it is required that the pressure book must be compact, and the spacing between the clamps should correspond to the thickness of the book block after compaction;
5, after the package appeared empty back. Poor fluidity and permeability of the glue, air bubbles and paper scraps in the glue, and lifting of the pallets are not easy. In this regard, the glue temperature should be adjusted to maintain good fluidity and permeability; the edge of the milling cutter should be sharpened and the brush should be adjusted to avoid the paper scraps on the back of the book from entering the glue pool; containing impurities and foaming. The strong glue should clean up and replace the new glue;
6, the cover and book block is not allowed to paste. The process of the book holder is inaccurate, and there is a difference between the front and rear positioning, resulting in the inaccurate position of the cover book, and a difference in the front and rear positioning, resulting in inaccurate positioning of the cover book. In this regard, it should be checked whether the brake device is worn or not, and according to the degree of wear of the brake pad, proper tightening or replacement of new accessories is necessary to ensure the correct positioning of the book holder.
To sum up, as long as we seriously shut down the good operation technology and process technology, and constantly sum up experience in practice, we can better prevent the occurrence of a variety of quality failures, so that product quality and production efficiency have been synchronized to improve. (Kang Qilai) ("Chinese Printing")
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