With the development of the society and the continuous improvement of people’s living standards, consumers, in addition to demanding the inherent quality of goods, have also put forward higher requirements for the packaging of goods when they purchase goods. This includes both the requirements for the design of packaging and decorating of goods and the requirements for the quality of post-press packaging processing.
Die-cutting and indentation processing technology is applicable to the surface processing of various printed matters. In particular, various grades of paperboard, cardboard boxes, trademarks, arts and Other surface finishing processing, but also an important means of achieving packaging design. Die-cutting and indentation processing not only plays an important role in the final quality and effect of the packaging, but also can greatly improve the artistic effect of the printed matter, and also give the print a new function, which has become an important means for value-added and promotion of printed matter. Therefore, the technology of die-cutting and indentation is increasingly favored by people, and the scope of use is also becoming wider and wider. However, in the die-cutting indentation process, a series of problems often occur, affecting the smooth progress of production. For this reason, the horizontal flat platen die-cutting machine is used to analyze the common problems in die-cutting and indentation production as an example. , I hope to help the actual production.
Fully automatic horizontal flat die cutting machine, the principle of paper feeding and delivery is similar to that of offset printing press. The faults between them are not analyzed here. The following only discusses the common problems of die cutting.
Inhomogeneous Pressure During Non-uniform Die Cutting Indentation, there are two general conditions:
1, if the pressure is slightly uneven, may be due to uneven distribution of die cutters, lines (steel knife, steel wire), resulting in the dynamic platform due to force deflection in die-cutting, this time should be on the die-cut version Add balance knife line to make the platform evenly.
2, if the platform before and after the four corners appear more serious pressure uneven phenomenon, it is mainly supporting the dynamic platform of the four connecting rod swing rod height caused by inconsistencies, this time should open the die-cutting base shield, check whether the swing rod If it is worn out, it needs to be replaced. Otherwise, adjust the four pressure adjustment inclined iron until the pressure is the same.
Die-cutting accuracy is not high Die-cutting accuracy is one of the most important standards for measuring the quality of die-cutting and is an important guarantee for producing qualified products. In the actual production process, die-cutting precision often fails to meet the design requirements. There are many factors that affect die-cutting precision, mainly in the following aspects:
1, the main drive chain wear and elongation, will directly affect the positioning accuracy before die cutting, this time can only replace the chain.
2. The wear of the intermittent mechanism causes the teeth to fluctuate in the process of stopping or starting, thus affecting the precision of die cutting. In this case, only the positioning accuracy is generally affected. At this time, the intermittent mechanism should be overhauled.
3. The positioning distance of the front and rear positioning swing frames is too small. Because the length of the chain itself has a certain error, if the positioning distance is too small, the chain error cannot be eliminated in the front and rear positioning, thereby affecting the precision of die cutting. At this time, the position of the adjustment screw of the front positioning pendulum or the position of the cam of the rear positioning pendulum should be adjusted so that the distance between the front and rear positioning frames can be adjusted to 2 to 3 mm.
4. The positioning of the upper die cut or lower die cut is inaccurate. Long-term use of the machine can cause wear of the positioning block on the die-cut frame or die-cut base plate, resulting in excessive fit clearance and resulting in reduced die-cutting accuracy. The positioning block should be replaced at this time.
5. The wear of the side positioning plate is an important factor causing the inaccurate positioning of the side. Because the amount of toggle that is positioned is not sufficient to make up for the amount of wear, lateral positioning accuracy may be degraded. The side positioning plate should be replaced at this time.
6, gripper pressure is too small or uneven. If the elasticity of the movable teeth of the grippers becomes smaller due to long-term use, it will cause the paper to slip or fall off during the transfer, which will directly affect the precision of die-cutting; uneven pressure between the grippers may cause the paper to die-cut. Skewness in the process. At this point should replace the active teeth. In addition, the fixed teeth should also be the same in level, otherwise it may also cause paper collision or crease after paper creping, affecting the accuracy of die-cutting.
7. The paperboard is deformed or stretched during operation, resulting in inaccurate “overprintâ€, which affects the precision of die cutting. Appropriate paper should be used to reduce the impact of material defects on die-cutting accuracy.
8. Inaccuracy caused by operator's operation error, or die cutting accuracy due to die cutting version accuracy is not high enough. At this time, professional training should be conducted for operators to improve production management requirements, or to remake the die-cut version.
Die-cutting and blanking The so-called loose-printing refers to the phenomenon that paper scraps and paper scraps are scattered when die-cut. Severe releases can affect normal production. The main reason for the dispersal is due to mistakes in the die-cutting platemaking process and improper selection of elastic rubber strips (or sponges); at the same time, other factors may also cause dispersal.
1. In the case of die-cutting plate-making, if the shape of the work is complex or there are a lot of work items, and the die-cut points are very small and few, it is easy to cause die-cutting. In this case, the number of consecutive points should be appropriately increased. If possible, the length of the job should be consistent with the paper conveying direction.
2. If the elastic strip (or sponge) on the die-cut version is too soft to bounce the paper smoothly, it will also cause a scattering. At this point should use high hardness, elastic good quality elastic tape (or sponge).
3. It is also an important reason that the pressure plate is too early to cause scattered version. After die cutting, when the moving platform descends, although the paper has been ejected from the knife line by the elastic rubber strip (sponge), since the elastic rubber strip (sponge) is generally 2 to 3 mm higher than the cutting line, if the gripper row is at this time At the beginning of the exercise, the sheet of paper is easily torn to cause a scattering due to the fact that the elastic strip (sponge) still presses the sheet against the die-cutting bottom plate. At this time, the coupling mechanism of the intermittent mechanism and the main chain wheel shaft should be released to adjust so that the moving platform is lowered from top dead center by 7 to 8 mm (when the corrugated fiber is die-cut at 10 to 15 mm), the pressure row starts to move.
4. In addition, the quality of the printed products that are die-cut is one of the reasons for the release. If the printed material is too bad and the fibers are too short, it may be scattered during the die-cutting process. In this case, the cutting speed can be reduced and the number of connecting points can be appropriately increased.
When cutting, the cutting edge is not smooth, and even the main reason for this phenomenon of fluffing is related to the quality of the steel knife and the normal function of the steel knife. There are mainly the following situations, which must be paid enough attention.
1. The poor quality of the steel knife, sharp edges and poor die-cutting adaptability are important reasons that cause the edge to be not smooth or even fluffy. Should be based on the different properties of the die-cut print, the choice of high-quality steel knife, to improve its die-cutting applicability, without special requirements, try to use the steel knife processing stripes.
2. The sharp edge of the steel blade is worn badly and has not been replaced in time, making the steel knife unable to function properly. The wear condition of the steel blade edge should be checked frequently. When it is found that the wear is severe and the die-cut quality is affected, a new steel blade should be replaced in time.
3. When the die-cutting pressure is adjusted, the steel blade is improperly filled with paper, that is, the pressure is not compensated, resulting in discomfort of die-cutting pressure, and the cutting edge is not smooth or fluffy. Should re-adjust the die-cutting pressure and replace the pad so that the pressure meets the die-cutting requirements.
4. The matching and installation of die cutters and elastic rubber strips (or sponges) is not standardized, which can also cause the above phenomena to occur. The elastic tape (or sponge) must have enough hardness to compress the paper and allow the die cutter to cut the print smoothly. Different papers should use different hardness elastic tapes (or sponges), and the placement and The height must also meet the specifications.
5, the edge is not smooth or fluffing, but also with the flatness of the bottom steel plate and the pressure of the machine. The bottom plate must be flat and the bottom plate should be replaced if necessary.
Explosion (explosion)
Burst refers to cracking of the paper at the indentation when the product is die-cut or when the product is folded. This is a problem that often occurs in die cutting, especially when the weather is dry. Specific analysis should be based on specific circumstances:
1, paper crisp, low moisture content, especially after high-temperature polished paper, die-cutting explosive line. At this time, prior to die-cutting, the paper should be wetted, and the back surface of the paper can be used as a water dispenser to increase the moisture content of the paper, so that the grade is slightly flexible, and then the die-cutting machine can be used. After the die-cutting, if the box is burst, it can be wiped at the crease to relieve the bursting condition.
2. The printed surface has a large area of ​​blue or black and other deep-colored fields, which can be explosively colored and burst after die-cutting. When printing, no ink additive is added or reduced in the dark ink to enhance the adhesion of the ink on the paper and reduce the explosion color and popping phenomenon.
3. When the thickness of the paper (board) is too large, it is easy to produce burst wire. At this time, the height of the die-cut steel wire should be reasonable.
4, after the paper under the pad explosion-proof line, at this time should be thin pad.
5, die-cutting machine is too explosive when the pressure is too large, this time should reduce the pressure, so that the waste side just separated.
6, indentation mold or bottom touch paper is too thick, narrow indentation, explosive line. Should use the appropriate thickness of the indentation die, the indentation width should be moderate.
7. The paper powder that has fallen off from the incision accumulates in the exploding line in the tank. Operators should promptly remove clean paper and foreign materials.
The reason that the indentation line irregularly produces the indentation line irregularity is mainly because the indentation groove on the steel wire pad paper is too wide and the position of the paperboard is indefinite when the mark is indented; the thickness of the steel wire pad paper is insufficient and the groove angle is not standardized. Extra rounded corners; row knife, solid knife tightness is not appropriate, steel is too tight, the bottom can not achieve the ideal contact with the platen plane, indentation prone to twisting; steel money is too loose, easy to move around indentation. The remedy is to replace the steel wire pad, and the width of the indentation groove is appropriate; increase the thickness of the steel wire pad and trim the groove angle; the tightness of the row knife when the knife is fixed should be appropriate.
After die-cutting and die-cutting, the label is peeled off after the adhesive die-cutting. During the decommissioning process, the label is often peeled off by the paper-edge scrap, especially for some small-area labels. . Generally this problem can be solved in the following ways:
1. When designing, properly increase the label area, the shape should not be too complicated, and arrange the labels properly.
2. Prevent the viscosity of the adhesive paper adhesive from decreasing. Can reduce storage and printing shop temperature, or increase its viscosity.
3. Replace the blunt blade with a blade or remake the die plate.
4, through the underlying mold die cutting method, adjust the die-cut version of the pressure, so that the die-cut version of the pressure uniformity, die-cut indentation depth consistent.
5, speed up the speed of die-cutting waste.
The above-mentioned issues are some of the common problems in production. In actual production, many other problems will arise. Specific analysis can be made based on specific situations to find out the possible causes and take corresponding measures to solve them. Only in the actual production and operation of continuous summary, master all kinds of skills, familiar with the performance of production equipment, master the production process requirements, in order to promptly and accurately eliminate the various problems occurred in production, for the smooth production of high quality Die-cutting crush products create favorable conditions.
Die-cutting and indentation processing technology is applicable to the surface processing of various printed matters. In particular, various grades of paperboard, cardboard boxes, trademarks, arts and Other surface finishing processing, but also an important means of achieving packaging design. Die-cutting and indentation processing not only plays an important role in the final quality and effect of the packaging, but also can greatly improve the artistic effect of the printed matter, and also give the print a new function, which has become an important means for value-added and promotion of printed matter. Therefore, the technology of die-cutting and indentation is increasingly favored by people, and the scope of use is also becoming wider and wider. However, in the die-cutting indentation process, a series of problems often occur, affecting the smooth progress of production. For this reason, the horizontal flat platen die-cutting machine is used to analyze the common problems in die-cutting and indentation production as an example. , I hope to help the actual production.
Fully automatic horizontal flat die cutting machine, the principle of paper feeding and delivery is similar to that of offset printing press. The faults between them are not analyzed here. The following only discusses the common problems of die cutting.
Inhomogeneous Pressure During Non-uniform Die Cutting Indentation, there are two general conditions:
1, if the pressure is slightly uneven, may be due to uneven distribution of die cutters, lines (steel knife, steel wire), resulting in the dynamic platform due to force deflection in die-cutting, this time should be on the die-cut version Add balance knife line to make the platform evenly.
2, if the platform before and after the four corners appear more serious pressure uneven phenomenon, it is mainly supporting the dynamic platform of the four connecting rod swing rod height caused by inconsistencies, this time should open the die-cutting base shield, check whether the swing rod If it is worn out, it needs to be replaced. Otherwise, adjust the four pressure adjustment inclined iron until the pressure is the same.
Die-cutting accuracy is not high Die-cutting accuracy is one of the most important standards for measuring the quality of die-cutting and is an important guarantee for producing qualified products. In the actual production process, die-cutting precision often fails to meet the design requirements. There are many factors that affect die-cutting precision, mainly in the following aspects:
1, the main drive chain wear and elongation, will directly affect the positioning accuracy before die cutting, this time can only replace the chain.
2. The wear of the intermittent mechanism causes the teeth to fluctuate in the process of stopping or starting, thus affecting the precision of die cutting. In this case, only the positioning accuracy is generally affected. At this time, the intermittent mechanism should be overhauled.
3. The positioning distance of the front and rear positioning swing frames is too small. Because the length of the chain itself has a certain error, if the positioning distance is too small, the chain error cannot be eliminated in the front and rear positioning, thereby affecting the precision of die cutting. At this time, the position of the adjustment screw of the front positioning pendulum or the position of the cam of the rear positioning pendulum should be adjusted so that the distance between the front and rear positioning frames can be adjusted to 2 to 3 mm.
4. The positioning of the upper die cut or lower die cut is inaccurate. Long-term use of the machine can cause wear of the positioning block on the die-cut frame or die-cut base plate, resulting in excessive fit clearance and resulting in reduced die-cutting accuracy. The positioning block should be replaced at this time.
5. The wear of the side positioning plate is an important factor causing the inaccurate positioning of the side. Because the amount of toggle that is positioned is not sufficient to make up for the amount of wear, lateral positioning accuracy may be degraded. The side positioning plate should be replaced at this time.
6, gripper pressure is too small or uneven. If the elasticity of the movable teeth of the grippers becomes smaller due to long-term use, it will cause the paper to slip or fall off during the transfer, which will directly affect the precision of die-cutting; uneven pressure between the grippers may cause the paper to die-cut. Skewness in the process. At this point should replace the active teeth. In addition, the fixed teeth should also be the same in level, otherwise it may also cause paper collision or crease after paper creping, affecting the accuracy of die-cutting.
7. The paperboard is deformed or stretched during operation, resulting in inaccurate “overprintâ€, which affects the precision of die cutting. Appropriate paper should be used to reduce the impact of material defects on die-cutting accuracy.
8. Inaccuracy caused by operator's operation error, or die cutting accuracy due to die cutting version accuracy is not high enough. At this time, professional training should be conducted for operators to improve production management requirements, or to remake the die-cut version.
Die-cutting and blanking The so-called loose-printing refers to the phenomenon that paper scraps and paper scraps are scattered when die-cut. Severe releases can affect normal production. The main reason for the dispersal is due to mistakes in the die-cutting platemaking process and improper selection of elastic rubber strips (or sponges); at the same time, other factors may also cause dispersal.
1. In the case of die-cutting plate-making, if the shape of the work is complex or there are a lot of work items, and the die-cut points are very small and few, it is easy to cause die-cutting. In this case, the number of consecutive points should be appropriately increased. If possible, the length of the job should be consistent with the paper conveying direction.
2. If the elastic strip (or sponge) on the die-cut version is too soft to bounce the paper smoothly, it will also cause a scattering. At this point should use high hardness, elastic good quality elastic tape (or sponge).
3. It is also an important reason that the pressure plate is too early to cause scattered version. After die cutting, when the moving platform descends, although the paper has been ejected from the knife line by the elastic rubber strip (sponge), since the elastic rubber strip (sponge) is generally 2 to 3 mm higher than the cutting line, if the gripper row is at this time At the beginning of the exercise, the sheet of paper is easily torn to cause a scattering due to the fact that the elastic strip (sponge) still presses the sheet against the die-cutting bottom plate. At this time, the coupling mechanism of the intermittent mechanism and the main chain wheel shaft should be released to adjust so that the moving platform is lowered from top dead center by 7 to 8 mm (when the corrugated fiber is die-cut at 10 to 15 mm), the pressure row starts to move.
4. In addition, the quality of the printed products that are die-cut is one of the reasons for the release. If the printed material is too bad and the fibers are too short, it may be scattered during the die-cutting process. In this case, the cutting speed can be reduced and the number of connecting points can be appropriately increased.
When cutting, the cutting edge is not smooth, and even the main reason for this phenomenon of fluffing is related to the quality of the steel knife and the normal function of the steel knife. There are mainly the following situations, which must be paid enough attention.
1. The poor quality of the steel knife, sharp edges and poor die-cutting adaptability are important reasons that cause the edge to be not smooth or even fluffy. Should be based on the different properties of the die-cut print, the choice of high-quality steel knife, to improve its die-cutting applicability, without special requirements, try to use the steel knife processing stripes.
2. The sharp edge of the steel blade is worn badly and has not been replaced in time, making the steel knife unable to function properly. The wear condition of the steel blade edge should be checked frequently. When it is found that the wear is severe and the die-cut quality is affected, a new steel blade should be replaced in time.
3. When the die-cutting pressure is adjusted, the steel blade is improperly filled with paper, that is, the pressure is not compensated, resulting in discomfort of die-cutting pressure, and the cutting edge is not smooth or fluffy. Should re-adjust the die-cutting pressure and replace the pad so that the pressure meets the die-cutting requirements.
4. The matching and installation of die cutters and elastic rubber strips (or sponges) is not standardized, which can also cause the above phenomena to occur. The elastic tape (or sponge) must have enough hardness to compress the paper and allow the die cutter to cut the print smoothly. Different papers should use different hardness elastic tapes (or sponges), and the placement and The height must also meet the specifications.
5, the edge is not smooth or fluffing, but also with the flatness of the bottom steel plate and the pressure of the machine. The bottom plate must be flat and the bottom plate should be replaced if necessary.
Explosion (explosion)
Burst refers to cracking of the paper at the indentation when the product is die-cut or when the product is folded. This is a problem that often occurs in die cutting, especially when the weather is dry. Specific analysis should be based on specific circumstances:
1, paper crisp, low moisture content, especially after high-temperature polished paper, die-cutting explosive line. At this time, prior to die-cutting, the paper should be wetted, and the back surface of the paper can be used as a water dispenser to increase the moisture content of the paper, so that the grade is slightly flexible, and then the die-cutting machine can be used. After the die-cutting, if the box is burst, it can be wiped at the crease to relieve the bursting condition.
2. The printed surface has a large area of ​​blue or black and other deep-colored fields, which can be explosively colored and burst after die-cutting. When printing, no ink additive is added or reduced in the dark ink to enhance the adhesion of the ink on the paper and reduce the explosion color and popping phenomenon.
3. When the thickness of the paper (board) is too large, it is easy to produce burst wire. At this time, the height of the die-cut steel wire should be reasonable.
4, after the paper under the pad explosion-proof line, at this time should be thin pad.
5, die-cutting machine is too explosive when the pressure is too large, this time should reduce the pressure, so that the waste side just separated.
6, indentation mold or bottom touch paper is too thick, narrow indentation, explosive line. Should use the appropriate thickness of the indentation die, the indentation width should be moderate.
7. The paper powder that has fallen off from the incision accumulates in the exploding line in the tank. Operators should promptly remove clean paper and foreign materials.
The reason that the indentation line irregularly produces the indentation line irregularity is mainly because the indentation groove on the steel wire pad paper is too wide and the position of the paperboard is indefinite when the mark is indented; the thickness of the steel wire pad paper is insufficient and the groove angle is not standardized. Extra rounded corners; row knife, solid knife tightness is not appropriate, steel is too tight, the bottom can not achieve the ideal contact with the platen plane, indentation prone to twisting; steel money is too loose, easy to move around indentation. The remedy is to replace the steel wire pad, and the width of the indentation groove is appropriate; increase the thickness of the steel wire pad and trim the groove angle; the tightness of the row knife when the knife is fixed should be appropriate.
After die-cutting and die-cutting, the label is peeled off after the adhesive die-cutting. During the decommissioning process, the label is often peeled off by the paper-edge scrap, especially for some small-area labels. . Generally this problem can be solved in the following ways:
1. When designing, properly increase the label area, the shape should not be too complicated, and arrange the labels properly.
2. Prevent the viscosity of the adhesive paper adhesive from decreasing. Can reduce storage and printing shop temperature, or increase its viscosity.
3. Replace the blunt blade with a blade or remake the die plate.
4, through the underlying mold die cutting method, adjust the die-cut version of the pressure, so that the die-cut version of the pressure uniformity, die-cut indentation depth consistent.
5, speed up the speed of die-cutting waste.
The above-mentioned issues are some of the common problems in production. In actual production, many other problems will arise. Specific analysis can be made based on specific situations to find out the possible causes and take corresponding measures to solve them. Only in the actual production and operation of continuous summary, master all kinds of skills, familiar with the performance of production equipment, master the production process requirements, in order to promptly and accurately eliminate the various problems occurred in production, for the smooth production of high quality Die-cutting crush products create favorable conditions.
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