Bookbinding is the method of binding a book to a book using hot melt adhesive instead of wire. The process of bookbinding is to enter the book block--milling back--pulling groove--a top cover of the upper backing glue covers the cover. Binding products have stable quality, low error rate, short production cycle and light labor intensity, which are the development direction of binding processes. Looking at the actual situation in our factory's work, if we can attach importance to the following aspects, the effect will be very good.
First, the correct choice of hot melt adhesive
The main material for glue-binding EVA hot melt adhesive is a solid, meltable polymer that does not require solvents and does not contain moisture. The hot melt adhesive is a solid at room temperature, and melts to a certain degree and turns into a fluid with a certain viscosity. It is composed of EVA resin, polymerized rosin, terpene resin, microcrystalline paraffin wax with adjustable viscosity, and antioxidant di-tert-butyl p-cresol. There are many types of hot melt adhesives on the market, and their performance is not the same. Hot melt adhesives should be used in accordance with the speed of the different glue machine points, there are low-speed plastic, medium-speed plastic, high-speed plastic three, low-speed glue fixed 2000/hour, medium-speed glue fixed 2000 ~ 4000/hour , high-speed binding speed is more than 4,000 per hour. The opening time of the hot melt adhesive for the low speed machine is 15 to 20 seconds, the opening time of the hot melt adhesive for the medium speed machine is 5 to 10 seconds, and the opening time of the hot melt adhesive for the high speed machine is 2 to 7 seconds. The curing time of the hot melt adhesive is 3 to 5 minutes. Hot melt adhesive opening time and curing time have a close relationship with the speed of glue binding, therefore, it should be reasonably selected according to the type and performance of the hot melt adhesive. In the selection, it should also be noted that the glue-binding product is different from the paper, and the hot-melt adhesive also has the difference between the coated paper and the general paper. Therefore, the hot melt adhesive must be selected appropriately. Different papers have different surface finishes, and the requirements for permeability, infiltration, and thermal conductivity of the glue are also different.
Second, the imposition of plastic book binding, pull mouth, tag code mark
The glued signatures are different from the iron plating before the machine printing, the saddle stitching, the sewing thread setting, and the punching of the upper printing are different. The binding of the glue binding bindings should be at the binding position. Relax 2~3mm, this is used for glue backing and milling, because the position of the booklet before the book is glued is to be milled flush, and the top page of the booklet is also milled into a single page to ensure The penetration of glue.
Book seal for the Lekou products, before the glue book should be the outer cut of the book on the knife to pull the mouth, pull the mouth should be outside the incision size should be relaxed 2 ~ 3mm, this sample can be finished after milling gum book and finished The standard is consistent.
The placement of the signature code on the signatures, and the quality control of the wrong posts and the off-posts in the binding production. In addition to marking the back of the book, the signature code of the glue book should also be marked appropriately in the space of the head of the book. After the well-written signature has been milled into the North Pole, all the marks on the back of the book have been milled. For example, if the signature is added to the sky-top part of the signature, the book that encloses the cover can be further expanded before the upper three-side machine knife is cut. Get the machine check.
Three, rubber booked book book core with posts after finishing
The processing of the book block before entering the glue after the binding is a process that can not be ignored in the glue-binding process. The smoothness and tightness of the well-distributed signatures directly affect the ability of the bookbinding product line to function properly. It also has a direct impact on the quality of the finished book. If the signature is unclear, bound, or not compacted, Turned into the milling back, pull the slot, then the quality of the semi-finished products in the binding machine is bound by book clips must be uneven back, milling cutter is not in place, the depth of the book back trough is not good enough, glue after the There will be many quality problems such as page breaks, loose pages, empty backs, wrinkled backs and so on, so it is very important to sort out the signatures. Finishing is to loosen and tie the well-booked signatures, bundle them, place a certain number of signatures on the binding machine, and use rigid wood boards as cushions at both ends of each bundle of signatures. Dimensions of the posts are consistent with each other. The binding machine is started, the loosened booklet is compacted, and then tied with a string. In order to stiffen the solidified back, the polyvinyl alcohol glue is used after the compression and binding. Thinly brush the back of the bundled books. After drying the polyethylene glycol glue on the brush, loosen the binding rope, then separate each book and separate it into glue.
Fourth, after the book block with the milling back, drawing slot
Iron back, pull groove is the key process of glue binding. Milling back is to trim the book block with a good signature along the set-up part and cut it into a single page. The back of the book cannot be milled into a bevel. The groove is used to cut the back of the book block with a special tool. The undulating grooves are deeply drawn to increase the permeability and contact area of ​​the hot melt adhesive to the book block, so that the pages can be closely bonded. According to the thickness of the paper, the number of folding layers of the book, the depth of milling should be set. Take 52g-60g paper as an example, the general cutting depth of 3-fold folding book block is 1.5-2mm, 40% off. Post book core is 2 ~ 3mm, pull groove depth is generally controlled between 0.8 ~ 1.5mm. If the paper is thick and fibrous is poor, it can be pulled deeper, but it can be pulled lighter. The deepest shall not exceed 1.5mm, and the shallowest shall not be less than 0.8mm. The shape of the pulling groove shall be ∧ type, and the angle shall be approximately 60°. The distance between two adjacent grooves is generally 3～5mm, and may also be appropriate according to the situation of the paper. Adjust the distance between the grooves, generally 64 to open the book core can pull 4 to 6 slots, 32 open book core can pull 6 to 8 slots, 16 open book core can pull 8 to 10 slots. 8 book core can pull 10 to 12 slots. If the depth of the milling back and groove is not up to the requirement, the penetration of the glue will be affected, which will result in the defects of page breaking and loosening. When checking the appropriateness of the milling back and groove depth, it is necessary to check the penetration of glue. The processing quality of semi-finished products such as pre-ordering, binding, and compaction is infringed, and the condition of gluing is also checked.
(to be continued)
First, the correct choice of hot melt adhesive
The main material for glue-binding EVA hot melt adhesive is a solid, meltable polymer that does not require solvents and does not contain moisture. The hot melt adhesive is a solid at room temperature, and melts to a certain degree and turns into a fluid with a certain viscosity. It is composed of EVA resin, polymerized rosin, terpene resin, microcrystalline paraffin wax with adjustable viscosity, and antioxidant di-tert-butyl p-cresol. There are many types of hot melt adhesives on the market, and their performance is not the same. Hot melt adhesives should be used in accordance with the speed of the different glue machine points, there are low-speed plastic, medium-speed plastic, high-speed plastic three, low-speed glue fixed 2000/hour, medium-speed glue fixed 2000 ~ 4000/hour , high-speed binding speed is more than 4,000 per hour. The opening time of the hot melt adhesive for the low speed machine is 15 to 20 seconds, the opening time of the hot melt adhesive for the medium speed machine is 5 to 10 seconds, and the opening time of the hot melt adhesive for the high speed machine is 2 to 7 seconds. The curing time of the hot melt adhesive is 3 to 5 minutes. Hot melt adhesive opening time and curing time have a close relationship with the speed of glue binding, therefore, it should be reasonably selected according to the type and performance of the hot melt adhesive. In the selection, it should also be noted that the glue-binding product is different from the paper, and the hot-melt adhesive also has the difference between the coated paper and the general paper. Therefore, the hot melt adhesive must be selected appropriately. Different papers have different surface finishes, and the requirements for permeability, infiltration, and thermal conductivity of the glue are also different.
Second, the imposition of plastic book binding, pull mouth, tag code mark
The glued signatures are different from the iron plating before the machine printing, the saddle stitching, the sewing thread setting, and the punching of the upper printing are different. The binding of the glue binding bindings should be at the binding position. Relax 2~3mm, this is used for glue backing and milling, because the position of the booklet before the book is glued is to be milled flush, and the top page of the booklet is also milled into a single page to ensure The penetration of glue.
Book seal for the Lekou products, before the glue book should be the outer cut of the book on the knife to pull the mouth, pull the mouth should be outside the incision size should be relaxed 2 ~ 3mm, this sample can be finished after milling gum book and finished The standard is consistent.
The placement of the signature code on the signatures, and the quality control of the wrong posts and the off-posts in the binding production. In addition to marking the back of the book, the signature code of the glue book should also be marked appropriately in the space of the head of the book. After the well-written signature has been milled into the North Pole, all the marks on the back of the book have been milled. For example, if the signature is added to the sky-top part of the signature, the book that encloses the cover can be further expanded before the upper three-side machine knife is cut. Get the machine check.
Three, rubber booked book book core with posts after finishing
The processing of the book block before entering the glue after the binding is a process that can not be ignored in the glue-binding process. The smoothness and tightness of the well-distributed signatures directly affect the ability of the bookbinding product line to function properly. It also has a direct impact on the quality of the finished book. If the signature is unclear, bound, or not compacted, Turned into the milling back, pull the slot, then the quality of the semi-finished products in the binding machine is bound by book clips must be uneven back, milling cutter is not in place, the depth of the book back trough is not good enough, glue after the There will be many quality problems such as page breaks, loose pages, empty backs, wrinkled backs and so on, so it is very important to sort out the signatures. Finishing is to loosen and tie the well-booked signatures, bundle them, place a certain number of signatures on the binding machine, and use rigid wood boards as cushions at both ends of each bundle of signatures. Dimensions of the posts are consistent with each other. The binding machine is started, the loosened booklet is compacted, and then tied with a string. In order to stiffen the solidified back, the polyvinyl alcohol glue is used after the compression and binding. Thinly brush the back of the bundled books. After drying the polyethylene glycol glue on the brush, loosen the binding rope, then separate each book and separate it into glue.
Fourth, after the book block with the milling back, drawing slot
Iron back, pull groove is the key process of glue binding. Milling back is to trim the book block with a good signature along the set-up part and cut it into a single page. The back of the book cannot be milled into a bevel. The groove is used to cut the back of the book block with a special tool. The undulating grooves are deeply drawn to increase the permeability and contact area of ​​the hot melt adhesive to the book block, so that the pages can be closely bonded. According to the thickness of the paper, the number of folding layers of the book, the depth of milling should be set. Take 52g-60g paper as an example, the general cutting depth of 3-fold folding book block is 1.5-2mm, 40% off. Post book core is 2 ~ 3mm, pull groove depth is generally controlled between 0.8 ~ 1.5mm. If the paper is thick and fibrous is poor, it can be pulled deeper, but it can be pulled lighter. The deepest shall not exceed 1.5mm, and the shallowest shall not be less than 0.8mm. The shape of the pulling groove shall be ∧ type, and the angle shall be approximately 60°. The distance between two adjacent grooves is generally 3～5mm, and may also be appropriate according to the situation of the paper. Adjust the distance between the grooves, generally 64 to open the book core can pull 4 to 6 slots, 32 open book core can pull 6 to 8 slots, 16 open book core can pull 8 to 10 slots. 8 book core can pull 10 to 12 slots. If the depth of the milling back and groove is not up to the requirement, the penetration of the glue will be affected, which will result in the defects of page breaking and loosening. When checking the appropriateness of the milling back and groove depth, it is necessary to check the penetration of glue. The processing quality of semi-finished products such as pre-ordering, binding, and compaction is infringed, and the condition of gluing is also checked.
(to be continued)
Paper packaging,compostable paper packaging,Eco paper packaging
JIANGYIN BIOPACKAGE CO.,LTD , https://www.biopackage.net