First, the choice of hot-melt adhesives There are many manufacturers of hot-melt adhesives, and the competition is fierce. The quality of the raw materials used to produce hot-melt adhesives is different, and the price difference is also great. Such as thinners with imported synthetic wax 1.9 million yuan / ton, the lowest grade of 0.35 million yuan / ton of wax; tackifier with imported hydrocarbon resin 15,500 yuan / ton, the lowest rosin resin is only 0.42 yuan / ton; import The price of EVA resin is 0.2 to 13,000 yuan/ton. With poor quality raw materials, the quality of hot-melt adhesives must also be poor, which is one of the important reasons why books and periodicals do pages and pages. We tested the physical properties of hot melt adhesives produced by six domestic manufacturers. The results show that the bookbinding hot melt adhesives generally meet the following performance criteria: tensile strength, elongation at break, high hardness, and fast curing speed. The melt viscosity is low and the thermal stability is better.
1, hot melt adhesive to have a higher tensile strength. The binding books, magazines, page breaks, page breaks, and breakage during use are directly related to the low tensile strength of hot melt adhesives. In the premise that the hot melt adhesive and the paper affinity (adhesive force) are sufficient, it must have a high tensile strength in order to ensure that the book is not easy to be opened, 208MM × 146MM format, the book strength of the adhesive layer 0.1 should not Less than 7 kg.
2, 2, higher elongation at break. Elongation at break is directly related to the toughness of the hot melt adhesive, the elongation at break is high, and the toughness of the hot glue is good. Only good toughness can guarantee that the glue book is not easily broken. From the test situation, this indicator should not be less than 600%.
3, curing speed. The curing speed of hot glue directly affects the forming quality of the glue book into the cutting quality. Especially for the high-speed linkage line and a grain station, if the curing speed is too slow, the book is deformed during the transfer process. If the hot melt adhesive with low tensile strength is used, the adhesive layer is thick, which can cause the back of the book to be out of squareness, and it is easy to stick the knife when cutting. The back of the book is also easily deformed. The curing speed of the hot melt adhesive is directly related to the system of the hot melt adhesive, the softening point, etc. The hot melt adhesive with a high softening point should be used, and the good softening point of the plastic is more than 85%.
4, higher hardness. The hardness of the hot melt adhesive is directly related to the flexing of the staple book. The hot melt adhesive has a high hardness, and the staples between the pages are not easily separated by the back of the book. According to our test, the hot melt adhesive (23 degrees Celsius) should not be lower than HS82.
5, lower melt viscosity (viscosity index). Hot melt adhesives only have a low melt viscosity to ensure good permeability, which is very important for glue books. However, excessively low melt viscosity can result in insufficient back sizing. The melt viscosity of the hot melt adhesive is preferably in the range of 4000-5000 centipoise.
6, good thermal stability. As the hot melt adhesive is recycled in the plastic pot or glue tank or is heated for a long time, if the hot melt adhesive has poor thermal stability (poor anti-aging property), the color of the glue will be darkened, and the appearance of the book will be affected. , heavy surface crusts, resulting in infusible material. As a result of aging test, the poor thermal stability of the glue will increase the permeability of the book, affecting the bond strength.
In the selection of hot melt adhesives, first of all to optimize the quality of the plastic properties, the price can not only consider the level of the price, to calculate the actual use price after use. Practice has proved that with good quality rubber, the thickness of the book back adhesive layer is 0.5-0.6 mm, and the thickness of the poor quality adhesive layer exceeds 1 mm, but the tensile strength is lower than that of the high-quality glue. The quality of good plastic is about 2 tons per ton. The price of poor quality rubber is 15,000 yuan/ton, but due to the large amount of usage, it is also equivalent to 29,000 yuan/ton in the final calculation. It is not counted in the consumption of aging and wastage. Loss of pages, page loss, financial loss.
Therefore, the low cost and poor quality hot melt adhesives are actually more expensive to use than good quality hot melt adhesives.
Second, milling book back, groove quality is critical 1, the amount of book back milling according to the thickness of the signature, in particular, pay attention to the book page folding, to prevent short-term phenomenon. To enable a page to be milled to a single page, the milling page runs synchronously with the page, and will not wear out. In addition, there is an up-turn milling station. Other coupling machines (including the single-bookbinding machine) Fixed, wear faster in use, pay attention to timely replacement, otherwise, book back milling into a slant, will make the thickness of the adhesive layer is not uniform.
2. The back of the book must be grooved and the consistency and spacing of the grooves should be kept. The quality of the milling groove is directly related to the adhesive strength of the book and the loose-leaf pages. After testing, under the same conditions, the initial tensile strength of 5 mm and 10 mm is different by about 1.5 kg. The depth of the groove also affects the initial tensile strength. Due to the different structure of the bookbinder plus machine operation and improper use, milling slots often have quality problems. If the spacing of the grooves is not the same, the depth of the milling groove is inconsistent. Some books have a deep groove in front, and the rear groove is Wang. When severely punished, most of the grooves are not milled. Germany's Warrenberg gear milling cutter is a separate station, and the cutter motor is frequency modulated. Synchronizing with the main engine speed, the spacing of the slots is not affected by the speed of the vehicle, and the same spacing can be maintained. Without the FM structure of the linkage machine, disc machine, single book binder bundling machine, we must rely on the speed of the speed adjustment and the number of cutters to match the number to achieve the spacing of examples. To maintain a consistent pitch, the vehicle speed must be steady. In some plants, the slot pitch is in a batch of products. The small ones like the serrations must be dense, and the large ones should be more than 15 mm. At this time, the initial tensile strength of the rubber book is greatly affected.
A variety of rubber-bonded knives are used to manufacture turret knives, which are made of phenolic resin or nylon. The cutter blades on the blade holder are all milled by themselves. These materials are not too wear-resistant. Strong, especially the use of grass-based paper in Belgium, knife blade wear quickly, less than 15,000 books have to replace the knife blade, otherwise, the groove is deep and shallow side of the milling, serious side The slot has no groove on one side and it eventually causes loose pages and page breaks.
In view of the fact that the grooved cutter blade wears fast and can not guarantee the requirements of the depth and depth of the milling groove, we have made improvements on the Warrenberg linkage mechanism (the other synchromesh and the single book binder are the same) and put the original phenolic knife. The pallets are replaced with gold steel cutter brackets, and then they are welded to the end face of the steel pallet with two hard alloys. The gap between the cutter and the milling cutter is controlled at about 0.10 millimeters on each side because they are all hard. For hard, in the production and debugging requirements are particularly fine. Its service life continued to be investigated, with two shifts being put on October 4 and no wear has been found yet.
The disc glue must be machined with a milling cutter and a milling cutter that is mounted on the same cutterhead. It belongs to cutterless plate milling and is milled by the gap adjustment between the bottom plane of the holder and the milling cutter. The milling cutter back and the milling groove depth To take care of each other, both the milling and backing requirements and the depth of the groove should be guaranteed. If the adjustment of the cutterhead is parallel, the milling cutters and the milling cutters are all secondary milling to form the same deep intersecting grooves in both positive and negative directions, especially when the paper using grass pulp as the main raw material is easy to produce a large amount of paper. The crumbs stick to the back of the book and cannot be removed. Some of the crumbs come into the pot or affect the penetration and bonding strength of the glue on the back of the book. (To be continued)
1, hot melt adhesive to have a higher tensile strength. The binding books, magazines, page breaks, page breaks, and breakage during use are directly related to the low tensile strength of hot melt adhesives. In the premise that the hot melt adhesive and the paper affinity (adhesive force) are sufficient, it must have a high tensile strength in order to ensure that the book is not easy to be opened, 208MM × 146MM format, the book strength of the adhesive layer 0.1 should not Less than 7 kg.
2, 2, higher elongation at break. Elongation at break is directly related to the toughness of the hot melt adhesive, the elongation at break is high, and the toughness of the hot glue is good. Only good toughness can guarantee that the glue book is not easily broken. From the test situation, this indicator should not be less than 600%.
3, curing speed. The curing speed of hot glue directly affects the forming quality of the glue book into the cutting quality. Especially for the high-speed linkage line and a grain station, if the curing speed is too slow, the book is deformed during the transfer process. If the hot melt adhesive with low tensile strength is used, the adhesive layer is thick, which can cause the back of the book to be out of squareness, and it is easy to stick the knife when cutting. The back of the book is also easily deformed. The curing speed of the hot melt adhesive is directly related to the system of the hot melt adhesive, the softening point, etc. The hot melt adhesive with a high softening point should be used, and the good softening point of the plastic is more than 85%.
4, higher hardness. The hardness of the hot melt adhesive is directly related to the flexing of the staple book. The hot melt adhesive has a high hardness, and the staples between the pages are not easily separated by the back of the book. According to our test, the hot melt adhesive (23 degrees Celsius) should not be lower than HS82.
5, lower melt viscosity (viscosity index). Hot melt adhesives only have a low melt viscosity to ensure good permeability, which is very important for glue books. However, excessively low melt viscosity can result in insufficient back sizing. The melt viscosity of the hot melt adhesive is preferably in the range of 4000-5000 centipoise.
6, good thermal stability. As the hot melt adhesive is recycled in the plastic pot or glue tank or is heated for a long time, if the hot melt adhesive has poor thermal stability (poor anti-aging property), the color of the glue will be darkened, and the appearance of the book will be affected. , heavy surface crusts, resulting in infusible material. As a result of aging test, the poor thermal stability of the glue will increase the permeability of the book, affecting the bond strength.
In the selection of hot melt adhesives, first of all to optimize the quality of the plastic properties, the price can not only consider the level of the price, to calculate the actual use price after use. Practice has proved that with good quality rubber, the thickness of the book back adhesive layer is 0.5-0.6 mm, and the thickness of the poor quality adhesive layer exceeds 1 mm, but the tensile strength is lower than that of the high-quality glue. The quality of good plastic is about 2 tons per ton. The price of poor quality rubber is 15,000 yuan/ton, but due to the large amount of usage, it is also equivalent to 29,000 yuan/ton in the final calculation. It is not counted in the consumption of aging and wastage. Loss of pages, page loss, financial loss.
Therefore, the low cost and poor quality hot melt adhesives are actually more expensive to use than good quality hot melt adhesives.
Second, milling book back, groove quality is critical 1, the amount of book back milling according to the thickness of the signature, in particular, pay attention to the book page folding, to prevent short-term phenomenon. To enable a page to be milled to a single page, the milling page runs synchronously with the page, and will not wear out. In addition, there is an up-turn milling station. Other coupling machines (including the single-bookbinding machine) Fixed, wear faster in use, pay attention to timely replacement, otherwise, book back milling into a slant, will make the thickness of the adhesive layer is not uniform.
2. The back of the book must be grooved and the consistency and spacing of the grooves should be kept. The quality of the milling groove is directly related to the adhesive strength of the book and the loose-leaf pages. After testing, under the same conditions, the initial tensile strength of 5 mm and 10 mm is different by about 1.5 kg. The depth of the groove also affects the initial tensile strength. Due to the different structure of the bookbinder plus machine operation and improper use, milling slots often have quality problems. If the spacing of the grooves is not the same, the depth of the milling groove is inconsistent. Some books have a deep groove in front, and the rear groove is Wang. When severely punished, most of the grooves are not milled. Germany's Warrenberg gear milling cutter is a separate station, and the cutter motor is frequency modulated. Synchronizing with the main engine speed, the spacing of the slots is not affected by the speed of the vehicle, and the same spacing can be maintained. Without the FM structure of the linkage machine, disc machine, single book binder bundling machine, we must rely on the speed of the speed adjustment and the number of cutters to match the number to achieve the spacing of examples. To maintain a consistent pitch, the vehicle speed must be steady. In some plants, the slot pitch is in a batch of products. The small ones like the serrations must be dense, and the large ones should be more than 15 mm. At this time, the initial tensile strength of the rubber book is greatly affected.
A variety of rubber-bonded knives are used to manufacture turret knives, which are made of phenolic resin or nylon. The cutter blades on the blade holder are all milled by themselves. These materials are not too wear-resistant. Strong, especially the use of grass-based paper in Belgium, knife blade wear quickly, less than 15,000 books have to replace the knife blade, otherwise, the groove is deep and shallow side of the milling, serious side The slot has no groove on one side and it eventually causes loose pages and page breaks.
In view of the fact that the grooved cutter blade wears fast and can not guarantee the requirements of the depth and depth of the milling groove, we have made improvements on the Warrenberg linkage mechanism (the other synchromesh and the single book binder are the same) and put the original phenolic knife. The pallets are replaced with gold steel cutter brackets, and then they are welded to the end face of the steel pallet with two hard alloys. The gap between the cutter and the milling cutter is controlled at about 0.10 millimeters on each side because they are all hard. For hard, in the production and debugging requirements are particularly fine. Its service life continued to be investigated, with two shifts being put on October 4 and no wear has been found yet.
The disc glue must be machined with a milling cutter and a milling cutter that is mounted on the same cutterhead. It belongs to cutterless plate milling and is milled by the gap adjustment between the bottom plane of the holder and the milling cutter. The milling cutter back and the milling groove depth To take care of each other, both the milling and backing requirements and the depth of the groove should be guaranteed. If the adjustment of the cutterhead is parallel, the milling cutters and the milling cutters are all secondary milling to form the same deep intersecting grooves in both positive and negative directions, especially when the paper using grass pulp as the main raw material is easy to produce a large amount of paper. The crumbs stick to the back of the book and cannot be removed. Some of the crumbs come into the pot or affect the penetration and bonding strength of the glue on the back of the book. (To be continued)
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