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There are no more common problems and solutions for printing stickers.

There are no more common problems and solutions for printing stickers.

Classification:
Product knowledge
2018/11/15 11:59
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Self-adhesive label is also called self-adhesive label material. It is a kind of composite material with paper, film or other special material as the fabric, adhesive on the back and silicon protective paper as the base. And after printing, die cutting and other processed products label.
 
Self-adhesive materials are usually printed and processed on label linkage. The most common form of printing is embossing. Other printing methods are also used. Common faults during printing are:
 
Fault 1: after printing, the surface of the label is not dry, slow drying or the ink layer will wipe off.
 
Reasons: too thick ink layer, too much ink, improper additives used in the ink, ink denaturation or improper types of ink used will cause the ink layer of the printed label to dry, dry slowly or erase once the ink layer is erased; in addition, the machine runs too fast, dry...
The solution is:
 
1, use the method of deep ink to reduce the thickness of ink layer.
 
2, the use of fast drying special ink;
 
3, the use of supporting the addition of Liu, plus matching desiccant;
 
4, measures should be taken to prolong the drying or curing time of printed matter.
 
5, increase room temperature, appropriate exhaust, speed up the drying of ink.
 
Fault 2: film surface printing ink layer adhesion fastness, easy to drop ink.
 
If the film surface is not treated by corona, or the film surface tension is lower than the ink surface tension, the ink will not be easy to adhere; if the unused ink does not match the characteristics of the film material or the special ink is not used, this kind of failure will also occur; and the use of expired or invalid ink will inevitably lead to such failure. In addition, the low power of the drying device (UV or infrared hot air drying) results in the ink can not be completely dried or the printing ink layer is too thick, the ink volume is too large, the ink viscosity is too large, resulting in the embrittlement of the ink after a long time drying, which will also lead to poor adhesion of the printing ink layer on the film surface and easy to drop ink.
 
The solution is:
 
1, improve the surface tension of the printing material, and require the surface tension value to reach 38 DIN / cm.
 
2, the rotary labelling machine should be equipped with corona devices. The corona can be used to improve the surface tension of the film.
 
3, first use transparent solvent based ink to make a reservation to improve the surface tension of the substrate.
 
4, select the special ink and matching additives matching with the printing materials.
 
5, improve drying or curing power, or reduce machine running speed, increase drying time;
 
6, the printing ink layer should be as thin as possible, and the ink should be as small as possible.
 
7. UV printing is recommended to protect the printing ink layer and increase the fastness of the ink layer.
 
Fault 3: ink fastness to printing on FASCLEAR and PRIMAX is poor.
 
Reasons: FASCLEAR and PRIMAX materials are soft matte surfaces with poor surface strength. Scratches will appear when fingernails are scratched lightly. Whether the surface tension is high or low, there will be problems of poor ink adhesion fastness. Moreover, even if there is no ink adhesion fastness problem on other printing materials, the ink will be printed on FASCLEAR and P. RIMAX materials will also have poor ink fastness. The so-called "drop ink" is actually damaged by the surface of the printing material, which has nothing to do with the ink.
 
The way to solve the problem is:
 
The adhesion fastness of ink on FASCLEAR and PRIMAX materials can be improved by adding hardening agent in ink and polishing oil or purchasing ink with hardening agent by increasing the friction resistance and hardness of ink and polishing oil.
 
Fault 4: after the end of the roll fragile paper is permeable, it can not be opened and printed.
 
Reasons: When slitting and rewinding small coils, the rewinding tension is too high, resulting in too tight rewinding, which will lead to the failure; too high temperature in storage or printing workshop will also lead to the failure; and the extrusion or storage time is too long also one of the reasons for the failure.
 
The way to solve the problem is:
 
1. In addition to improving the storage and processing conditions for the above reasons, alcohol can also be used to wipe and infiltrate the end surface of the adhesive, so as to dilute the adhesive and reduce its viscosity, so as to facilitate uncoiling.
 
2, gently open the book, powder on both ends and rewind slowly.
 
3. The improved reel self-adhesive material should be printed and die-cutting slowly on the intermittent paper feeding label machine.
 
Self-adhesive label is also called self-adhesive label material. It is a kind of composite material with paper, film or other special material as the fabric, adhesive on the back and silicon protective paper as the base. And after printing, die cutting and other processed products label.
 
Self-adhesive materials are usually printed and processed on label linkage. The most common form of printing is embossing. Other printing methods are also used. Common faults during printing are:
 
Fault 1: after printing, the surface of the label is not dry, slow drying or the ink layer will wipe off.
 
Reasons: too thick ink layer, too much ink, improper additives used in the ink, ink denaturation or improper types of ink used will cause the ink layer of the printed label to dry, dry slowly or erase once the ink layer is erased; in addition, the machine runs too fast, dry...
The solution is:
 
1, use the method of deep ink to reduce the thickness of ink layer.
 
2, the use of fast drying special ink;
 
3, the use of supporting the addition of Liu, plus matching desiccant;
 
4, measures should be taken to prolong the drying or curing time of printed matter.
 
5, increase room temperature, appropriate exhaust, speed up the drying of ink.
 
Fault 2: film surface printing ink layer adhesion fastness, easy to drop ink.
 
If the film surface is not treated by corona, or the film surface tension is lower than the ink surface tension, the ink will not be easy to adhere; if the unused ink does not match the characteristics of the film material or the special ink is not used, this kind of failure will also occur; and the use of expired or invalid ink will inevitably lead to such failure. In addition, the low power of the drying device (UV or infrared hot air drying) results in the ink can not be completely dried or the printing ink layer is too thick, the ink volume is too large, the ink viscosity is too large, resulting in the embrittlement of the ink after a long time drying, which will also lead to poor adhesion of the printing ink layer on the film surface and easy to drop ink.
 
The solution is:
 
1, improve the surface tension of the printing material, and require the surface tension value to reach 38 DIN / cm.
 
2, the rotary labelling machine should be equipped with corona devices. The corona can be used to improve the surface tension of the film.
 
3, first use transparent solvent based ink to make a reservation to improve the surface tension of the substrate.
 
4, select the special ink and matching additives matching with the printing materials.
 
5, improve drying or curing power, or reduce machine running speed, increase drying time;
 
6, the printing ink layer should be as thin as possible, and the ink should be as small as possible.
 
7. UV printing is recommended to protect the printing ink layer and increase the fastness of the ink layer.
 
Fault 3: ink fastness to printing on FASCLEAR and PRIMAX is poor.
 
Reasons: FASCLEAR and PRIMAX materials are soft matte surfaces with poor surface strength. Scratches will appear when fingernails are scratched lightly. Whether the surface tension is high or low, there will be problems of poor ink adhesion fastness. Moreover, even if there is no ink adhesion fastness problem on other printing materials, the ink will be printed on FASCLEAR and P. RIMAX materials will also have poor ink fastness. The so-called "drop ink" is actually damaged by the surface of the printing material, which has nothing to do with the ink.
 
The way to solve the problem is:
 
The adhesion fastness of ink on FASCLEAR and PRIMAX materials can be improved by adding hardening agent in ink and polishing oil or purchasing ink with hardening agent by increasing the friction resistance and hardness of ink and polishing oil.
 
Fault 4: after the end of the roll fragile paper is permeable, it can not be opened and printed.
 
Reasons: When slitting and rewinding small coils, the rewinding tension is too high, resulting in too tight rewinding, which will lead to the failure; too high temperature in storage or printing workshop will also lead to the failure; and the extrusion or storage time is too long also one of the reasons for the failure.
 
The way to solve the problem is:
 
1. In addition to improving the storage and processing conditions for the above reasons, alcohol can also be used to wipe and infiltrate the end surface of the adhesive, so as to dilute the adhesive and reduce its viscosity, so as to facilitate uncoiling.
 
2, gently open the book, powder on both ends and rewind slowly.
 
3. The improved reel self-adhesive material should be printed and die-cutting slowly on the intermittent paper feeding label machine.
 
Fault 8: single printing printing is not allowed.
 
Reasons: (1) overprint error caused by paper size instability.
 
The paper size changes due to the different humidity of the printing and processing environment in which the paper is manufactured; the uneven moisture content on the surface of the paper results in the deformation of the four sides or local deformation of the paper; in the paper of the same size, the shrinkage rate is different due to the inconsistency of the fibre orientation of part of the paper; while in the workshop, the shrinkage rate of the paper is different due to the inconsistency of the fibre orientation of The instability of temperature and humidity will lead to a larger change in paper size.
 
The way to solve the problem is:
 
1, the printing workshop will be gradually controlled at 20 to 22 degrees Celsius, and the relative humidity should be controlled at 50%.
 
2, control the fountain solution at the lowest level, so as to reduce the drawing and deformation of the paper.
 
3, try to use multicolor printing machine to finish printing multicolor once.
 
4. In order to protect the semi-finished products, it is better to use plastic cloth to seal them, especially in rainy season.
 
5, use the same direction of fiber paper, different fiber direction of paper should be stacked, printing;
 
6. When conditions permit, paper should enter the printing workshop in advance so that it has sufficient time to balance the temperature and humidity of the environment.
 
7. For paper with excessive humidity, the method of pre-printing can be used to speed up its balance with the environment in temperature and humidity.
 
8. For small labels that need to be stamped and die-cut, they should be printed first, and then the stamping plate and die-cut plate should be made according to the actual size after the size is stabilized.
 
Reasons (2): overprint errors caused by other reasons.
 
1, the paper sealant, so that the front and side rules are not in place, resulting in overprint.
 
2. The paper in the same stack is misaligned due to the rebound and skew of the paper when cutting and positioning, and it is difficult to register when printing.
 
3, the paper creases cause paper deformation too large, causing people to overprint.
 
4, electrostatic adsorption caused overprint.
 
5, when the plate is installed, due to the different color plate tensile deformation, different elastic, resulting in overprint is not allowed;
 
6, the different color group of rubber cloth lining is inconsistent, deformation amount is inconsistent, resulting in overprint is not allowed;
 
7, incorrect adjustment and reduction of drum liner causes incorrect printing.
 
8, the cause of printing is not allowed by the cause of paper feeding mechanism and paper transfer mechanism.
 
The way to solve the problem is:
 
1. To use non-permeable and qualified non-dry adhesive materials, talc powder should be sprayed or taped to improve the permeability.
 
2. Improve the accuracy of paper cutting. If necessary, it can be cut again.
 
3. Install static eliminator to control static electricity and install humidifier to control workshop temperature and humidity.
 
4, through proofing, the upper plate, lining and rubber cloth should be tightened up to ensure accuracy.
 
5, replace the blanket or lining with a complete set of units, so that the elastic rollers of all rubber groups are consistent.
 
6, improve printing accuracy, ensure correct paper transfer and paper delivery.
 
Fault 9: ink color is not consistent.
 
Reason: uneven printing pressure or uneven ink on the page.
The way to solve the problem is:
 
1, adjust the pressure and re pad.
 
2, adjust ink fountain or inking system, so that ink roller to ink volume.
 
Fault 10: paste or deformation at lines or dots.
 
Reasons: too much ink, too much contact pressure between the inking roll and the plate or too much printing pressure are the main reasons for the deformation of paste plate and dot.
The way to solve the problem is:
 
1, reduce the inking volume of the ink roller properly.
 
2, lighten the contact pressure between ink roller and printing plate.
 
3, reduce printing pressure or partial adjustment of pad table.
 
Fault 11: printed matter rubbing dirty, dirty back, adhesion
Cause: ink is not completely dried or ink is too large.
 
The way to solve the problem is:
 
1, reduce printing speed;
 
2, adjust the ink, add the corresponding auxiliaries;
 
3. Stacking can be stacked on the paper rack.
 
4, reduce ink consumption.

 

Three, die cutting fault and elimination
Fault 1: flat flat die cutting middle end paper is cut through.
 
Reasons: uneven base paper thickness; too many labels on a die-cutting plate, too large area; uneven die-cutting plate, low precision; die-cutting mechanism caused by low precision die-cutting instability; die-cutting gasket plate uneven or bump; die-cutting blade selection is incorrect.
 
The way to solve the problem is:
 
1, try to use thicker bottom paper or use better material as bottom paper.
 
2, improve the accuracy of die plate, if necessary, professional manufacturers to manufacture;
 
3, use the good liner plate and check regularly, clean and replace the material backing plate.
 
4, large area printing can be used to cut and then small area die-cutting.
 
5, use high-precision special dry glue die-cutting blade to make die cutting plate.
 
Fault 2: when the die is cut back, the paper edges often break and cannot start normally.
 
Reasons: uneven die-cutting plate or backing plate, resulting in partial non-cut edge; machine speed is too fast or too slow, resulting in improper traction tension of non-adhesive printing materials; waste edge is too narrow, label size is too large or too slender, it is not easy to discharge waste; the separation force between label and base paper is too large, the paper edge can not withstand reverse tension; the shape of label is special. The arrangement is unreasonable and the waste is difficult.
 
The way to solve the problem is:
 
1, improve the precision of die cutting plate and reduce die cutting area.
 
2. Die cutting floor should be smoothed and replaced regularly.
 
3, correctly adjust the discharge and tension.
 
4, properly set the size of the waste paper edge to improve its tensile strength.
 
5, replace the adhesive label material that is suitable for stripping force.
 
6, according to the reasonable shape of the label, make it easy to discharge.
 
Fault 3: when the waste is removed, the paper will be uncovered with the side of the paper.
 
Reasons: uneven die-cutting pressure, resulting in inconsistent depth of die-cutting, so that part of the paper edge is not cut off; die plate use time is too long; blade is too blunt, resulting in surface materials pressed into the base paper but not cut off; the machine right speed is not appropriate, too slow or too fast, affecting waste discharge; waste paper edge is too narrow, when broken, there is a phenomenon of standard dropping; The discharging angle of the edge is not appropriate, and the non-five glue material is not suitable; the separating force between the base paper and the face paper is too small; the label area is too small, and the arrangement method is not appropriate; the temperature of the production workshop is too low, which changes the adhesion performance.
 
The way to solve the problem is:
 
1, adjust the die cutting plate, improve the die cutting accuracy, and paste the sponge on the page.
 
2, change the speed of machine, adjust the waste angle of paper edge or replace the waste roller.
 
3, use the suitable adhesive material for the release force, and arrange the width of the waste side reasonably.
 
4. Keep the salt in the workshop. The adhesive will stabilize.
Four. Glazing fault and elimination
 
The common quality problems in UV glazing are:
 
1. After a period of time, the printed matter is yellow and red, changing color.
 
2, printing surface is not bright; wrinkle or streak;
 
3. The glazing surface is sticky and not smooth.
 
4, glazing layer is not firm, ink, bubble, pock and so on.
 
 
The way to solve the problem is:
1, use high quality and effective period of polish.
 
2, reasonable control of polishing oil quantity, neither too little nor too much, we must pay attention to leveling effect;
 
3. Pay attention to the printing quality of the bottom ink, and print and print the ink.
 
4. Adjust the viscosity of varnish correctly according to the actual situation of glazing surface.
 
5. Correctly adjust the surface tension of polishing oil to make it less than the surface tension of ink. Solvents or surfactants with low surface tension can be added.
 
6. Avoid ink crystallization and surface treatment if necessary.
 
7, adjust the relationship between machine speed, polishing oil and drying energy.

  

Five, covering failure and exclusion
 
Fault 1: the pattern is false, the film and printing products are poorly bonded.
 
Reasons: Defects on the surface, low hardness, insufficient pressure of the roll, or the non-parallel between the roll and the bottom roll will cause the failure; too thick printing ink or the film is not dry when the film is covered, or too fast machine speed is also the cause of the failure.
The way to solve the problem is:
 
1, increase the pressure of film roller.
 
2, adjust the parallelism between the two rollers.
 
3, if the film roller itself has problems, replace the film roller.
 
4, reduce machine speed or change ink composition.
 
Fault 2: there are indentation marks on the surface of the pattern.
Cause: the surface of film roller is not clean or worn.
Solution: clean or replace film roller.
 
Fault 3: printed products have wrinkles on the surface.
 
Reasons: Too loose composite film or too large tension of base paper, as well as inconsistent tension on both sides of composite film will lead to this failure.
 
The way to solve the problem is:
1. Tensioned composite film;
 
2, reduce the tensile force of the bottom paper.
 
3, switch to suitable composite film.
 
Fault 4: label pasted on the bottle body to raise the edge.
Reasons: Paper is too thin or composite film is too tight can easily make printed matter warped, and composite film is too thin or has quality problems, causing faults is difficult to avoid.
The way to solve the problem is:
 
1, avoid thin film.
 
2. When the composite film is stretched too large, it is necessary to replace the composite film with small peel strength or bottom paper.
 
3. When the sheet is coated, the tension direction should be perpendicular to the direction of the label.
 
4, we must control the tension, pressure and speed of laminating to ensure the accuracy of film mulching.
 
5, plastic film suitable for small format label, plane paste, large format label recommended glazing process.
 
Fault 5: bubbling and whitening in the pattern
Reasons: Printing ink layer is not dry enough, ink layer is too thick, film pressure is not enough, composite film is too loose or uneven thickness will lead to this failure.
 
The way to solve the problem is:
 
1, increase the compound pressure;
 
2, replace the composite membrane or adjust its tension.
 
Six, gilding failure and elimination.
 
Fault 1: hot stamping or hot stamping.
Reasons: Low hot stamping temperature, low plate pressure, crystallization or smoothness of printing ink surface, too thick ink layer and improper type of electrolytic aluminium may lead to this failure.
 
The way to solve the problem is:
1, improve the stamping temperature appropriately.
 
2, increase the pressure of printing plate;
 
3, change the ink composition to make the ink layer surface modified.
 
4, reduce the thickness of ink layer and reduce overprint.
 
5, transform other types of electrochemical aluminum.
Fault 2: anodized aluminum tape
Reasons: Inadequate drying of printing ink, too low ink adhesion and too much separation of electrolytic aluminum are the main reasons for this failure.
 
The way to tackle the problem is:
 
1, before printing hot aluminum, make the ink fully dry.
 
2, change the ink composition;
 
3, switch to the low separation power of aluminum.
 
Fault 3: blotting and hair raising
Reason: improper pressure adjustment or low printing temperature.
The way to solve the problem is:
1, adjust the pressure, partial pad;
 
2, appropriately raise the bronzing temperature.
 
Fault 4: imprinting metal luster reduced
Cause: the printing plate temperature is too high.
The way to solve the problem is:
 
1, reduce the electric heating temperature;
 
2, reduce unnecessary downtime and shorten downtime.
 
Fault 5: imprint is not clear, lack of pen break painting
Reasons: When the imprinting is not clear, the first thing to consider is whether the stamping plate itself is defective. In addition, too tight aluminium electrolyte, uneven stamping pressure, too narrow aluminium electrolyte or paper guide direction deviation are also the causes of such faults.
 
The way to solve the problem is:
 
1, replace the printing plate;
 
2, reduce the tension of anodized aluminum.
 
3, partial pad, keep hot stamping pressure consistent.
 
4, switch to a wider range of electrified aluminum.
 
5, adjust the guide paper mechanism.
Fault 6: The most common quality problems in stamping of self-adhesive labels - difficult stamping of film materials and UV ink surfaces, unclear imprinting
 
The way to solve the problem is:
 
1, choose special and matching hot gold foil and try to use imported materials.
 
2, protect the printing plate, require printing plate to be smooth, surface no dirt;
 
3, thin films should be corona treated to improve their surface tension.
 
4. Reduce the hot stamping area, ensure the evenness of the printing plate and the pressure of hot stamping.
 
5. When using hard liner material, the liner should be smooth and even.
 
6, through experiments to find the best matching of hot stamping pressure, speed, turbidity and waste discharge.

  

 

Seven, labeling failure and exclusion
 
Fault 1: bubbles appear on oil tanks and other containers when a large area of paper labels are attached.
 
Reasons: The temperature and humidity difference between label storage environment and labeling environment is too big, leading to the label quickly absorb water and form bubbles after labeling; or because the labeling surface is not uniform or dirty with bubbles, leading to labeling is not firm and bubbles appear.
 
The way to solve the problem is:
 
1. Before labeling, the label should be placed in the labeling environment for a period of time to achieve a humidity balance with the environment.
 
2, make the surface of the labeled object keep dry and clean, and paste it firmly on the label.
 
Fault 2: transparent film label affixed to transparent bottle body after bubbles appear, affecting beauty.
 
Reasons: The surface of bottle body is not uniform, and air bubbles will be generated if there are small pits or the label's hardness or softness matches with the bottle body; and if the labeling method of labeling machine does not match the shape of bottle body or the labeling method is not appropriate, the air will remain in the label and generate bubbles.
 
The way to solve the problem is:
 
1, check whether the bottle body is balanced before labeling. If unbalanced, the mold for bottle production should be trimmed.
 
2, transparent special labelling machine, with rubber scraper label.
 
3, choose the material that matches the bottle body material to print the bottle paste.
 

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