The influence of the state of the ink on the quality of the film The quality of the ink on the print mainly refers to the properties of the paper, the ink properties, the thickness of the ink layer, the area of ​​the graphics, and the density of the printed graphics. Their influence on the quality of the film is mainly related to the quality of the printed matter. The effect of the adhesive strength of the film.
Thickness of the ink layer When the ink layer of the printed matter is thick and the area of ​​the graphic is large, the ink changes the porous surface characteristics of the paper, and many paper fiber capillary pores are closed, impeding the penetration and diffusion of the adhesive, making the printed matter and the plastic film. Bonding is difficult, and delamination, blistering, etc. may easily occur. Therefore, during process selection, offset printing should be used to print products that will be covered because the ink layer of the offset product is thinner.
The role of the ink diluting agent Common ink diluting agents are white ink, weili oil and bright light paste. In the white ink, there are obvious silt particles, and the combination with the continuous material is not tight. After printing, these pigment particles will float on the paper surface, which has an obstructive effect on adhesion. Wiley ink is rolled from aluminum hydroxide and continuous material. Due to the lightness of aluminum hydroxide, it tends to float on the surface of the ink layer after printing. When the film is covered, an adhesive layer is formed between the adhesive and the ink layer, resulting in stickiness. Can not close or blistering. The glossy pulp is made of resin, dry vegetable oil, drier, etc. The texture is delicate and the film is bright. It has similar properties with the conjugated multi-bond terpene resin as the main component, and they have good affinity and can firmly adsorb the polypropylene film on the ink surface.
Dry oil added to the ink to add dry oil, can speed up the drying of the print, but dry oil plus heavy volume, easy to make the surface of the ink layer into a glossy and smooth low interface layer, the adhesive is difficult to wet and infiltration, affect the film's Fastness, therefore, to control the amount of dry oil.
The dusting and offset printing adopts the dusting process to avoid the dirtying of the printed matter, and the dusting forms a layer of fine particles on the surface of the ink layer. When the film is coated, the adhesive does not adhere to the ink layer in every place, but binds with these powders to form a false-stick phenomenon, which seriously affects the quality of the film. Therefore, the product to be covered should avoid the use of dusting technology, printed matter that has been dusted, and dry wipes on a dry basis with a dry cloth.
The nature of the ink stickiness of the printed product is due to the ink. To solve this problem, the ink must be improved in the process, and the ink is added in proportion to 10% of the stickiness agent, which is very effective for preventing stickiness. After the ink is added with the viscose, it not only prevents stickiness, does not affect the hue and color saturation of the printed product, but also makes the ink layer brighter, the dots are clearer, and it is also more convenient for post-printing processing procedures such as calendering, laminating, hot stamping. Wait. Gram granules can be used as an alternative to dry oil, dusting, and other anti-sticking dirty materials.
Gold and silver ink prints and silver inks are made of metal powders and binders. The distribution and homogeneity of the metal powders in the binder are extremely poor, and the ink layers are easily separated during the drying process. These separated metal powders form a barrier between the ink layer and the adhesive layer, affecting the effective bonding of the two interfaces. After such a product is left for a period of time, wrinkling and blistering may occur. Therefore, the coating of gold and silver ink prints should be avoided.
The dry state of the printed ink layer is covered when the ink is not completely dried. The high boiling point solvent contained in the ink tends to cause the plastic film to expand and elongate. This is the main reason for the blistering and delamination of the product after the film is covered. Full drying of the ink layer is the primary condition for guaranteeing the quality of the film. For products that are imprinted and eagerly coated, they can be dried in an oven.
The influence of the temperature and humidity of the filming shop environment on the quality of the coating film The environmental humidity of the film coating shop affects the quality of the coating film. The main reason is that the moisture content changes with the relative humidity of the air between the adhesive and the plastic film and the printed matter. Humidity-sensitive prints can develop internal stresses due to dimensional changes.
For example, the longitudinal stretch rate of the printed matter is 0.5%, and the longitudinal shrinkage of the BOPP film is 4%. If the water absorption capacity of the printed material is too large and the film is stretched, the internal stress caused by heat shrinkage of the film may cause the film product to curl, tend, and stick. Not together. In addition, in a high humidity environment, the equilibrium moisture content of the printed matter will also change, and the large amount of moisture absorbed from the air medium will be released from the surface during the hot-press compounding process, stagnating at the adhesive interface, and being formed locally. Adhesion phenomenon. Moreover, changes in the balance of moisture in the printed matter (absorbing moisture from the air medium or releasing moisture into the air medium) often occur at the edge of the print, making it a scalloped edge or a tight edge, and it is not easy to form a film with the film during hot press compounding. Good adhesion produces wrinkles, making production unsuccessful.
Laminating Common Faults and Remedy (1) Adhesion Poor and Remedy 1 The adhesive is not properly selected, the amount of glue is not properly set, and the ratio measurement is incorrect. The adhesive brand and coating amount should be re-selected and accurately formulated.
2 The diluent contains hydroxyl-consuming alcohol and water, so that the hydroxyl group of the main agent does not react. High purity (99.5%) ethyl acetate should be used.
3 The print surface has dusting. Wipe gently with a dry cloth.
4 The ink on the print is too thick. Should increase the amount of adhesive coating, increase the pressure.
5 The ink on the printed material is dry or not completely dry. Should be hot-pressed again and then gluing; select a high solid content of the adhesive; increase the adhesive coating thickness; increase the adhesive coating thickness; increase the temperature of the drying path.
6 The adhesive is absorbed by the printing ink and paper, so that the amount of coating is insufficient. The formula and coating amount should be reset.
7 The surface treatment of the plastic film is insufficient or exceeds the pot life, rendering the treated surface ineffective. The set formula and coating amount should be updated.
8 The pressure is low, the speed is fast, and the temperature is low. The film temperature and pressure should be increased and the vehicle speed should be appropriately reduced.
(2) Blistering and repelling method 1 The printing ink layer is not dry. Should be hot-pressed again and then glue; delay filming time, make it completely dry.
2 Printing ink layer is too thick. The amount of adhesive applied should be increased to increase the pressure and the composite temperature.
3 The drying temperature is too high and the adhesive surface is crusted. Drying temperature should be reduced.
4 The surface temperature of the composite roller is too high. The composite roll temperature should be reduced.
5 The film is wrinkled or loose. The film is uneven or curled. Replace the qualified film and adjust the tension.
6 Wrap dust and impurities on the surface of the film. Dust and impurities should be removed.
7 The adhesive is unevenly coated and used in small amounts. Should increase the amount of coating and uniformity.
8 High adhesive concentration, high viscosity, uneven coating. Apply thinner to reduce the binder concentration.
(3) uneven coating and removal methods 1 glue in the tank curing. Replace or add adhesives.
2 The pressure is small. Should increase the compound pressure.
3 Roller swelling, deformation. Replace the roller.
4 Plastic film thickness tolerance. Replace the film and use a film with a small thickness tolerance.
5 The film is slack. Traction should be adjusted.
(4) Wrinkled film and removal method 1 The film transfer roll is not balanced. The transfer roller should be adjusted.
2 The film is inconsistent or wavy at both ends. Taiwan cell membrane should be replaced.
3 The glue layer is too thick and the solvent evaporation is not thorough, which affects the viscosity. It is squeezed by the pressure roller and slips between the paper (print) and the film. The amount of glue should be adjusted to increase the temperature of the drying tunnel.
4 The heating roller and the rubber roller are not even at both ends, and the pressure is inconsistent and the line speed is not equal. Two rollers should be adjusted.
5 The tension is not enough to make the film trend uneven, which can cause the film to wrinkle. The pressure should be adjusted to make it normal.
6 The surface of the paint layer on the film does not dry and can cause the film to wrinkle. Improve the drying temperature to solve.
7 When the temperature is too high, wrinkling of the film can also occur. In the lamination process, the purpose of warming is to soften the film and bond the paper to the plastic film. Fan cooling, turning off the heating wire, or other cooling measures should be taken to restore the temperature to normal as soon as possible.
(5) Corrugated paper and removal methods Papers for coated films are generally coated paper, offset paper, whiteboard paper, and the like. The wrinkling of the paper occurs when the film is covered. Generally, there are the following situations:
1 The temperature and humidity of the workshop are not properly controlled. Relative humidity is too high, the paper suction from the "flounce", causing wrinkling of the paper during the coating process, must strictly control the workshop's temperature and humidity.
2 If the ambient temperature is too high or the film temperature is too high, the paper will “tighten†and cause the paper to wrinkle. Press plates can be used to flatten the number of paper knocks and kneading before coating, and reduce the environment and film temperature.
3 Roller pressure is not uniform, causing the paper to wrinkle during lamination. In this case, correct the roller pressure before starting the operation.
4 The rubber roller itself is uneven, causing the paper in the film to wrinkle. Replace the new rubber roller or grind the old rubber roller and use it again.
5 The dirt on the rubber roller causes the paper to wrinkle when the film is covered. The rubber roller should be cleaned in time. The rubber roller must always be kept clean.
6 If the pulling force is too large, the film is rolled up and torn, causing the paper to wrinkle when it is covered. The tension should be properly adjusted.
7 The paper feed is skewed, causing the paper to wrinkle when it is covered. The operation center must take care to ensure that the paper is delivered flat. (Text / Jin Yin He) ("China Packaging News")
Thickness of the ink layer When the ink layer of the printed matter is thick and the area of ​​the graphic is large, the ink changes the porous surface characteristics of the paper, and many paper fiber capillary pores are closed, impeding the penetration and diffusion of the adhesive, making the printed matter and the plastic film. Bonding is difficult, and delamination, blistering, etc. may easily occur. Therefore, during process selection, offset printing should be used to print products that will be covered because the ink layer of the offset product is thinner.
The role of the ink diluting agent Common ink diluting agents are white ink, weili oil and bright light paste. In the white ink, there are obvious silt particles, and the combination with the continuous material is not tight. After printing, these pigment particles will float on the paper surface, which has an obstructive effect on adhesion. Wiley ink is rolled from aluminum hydroxide and continuous material. Due to the lightness of aluminum hydroxide, it tends to float on the surface of the ink layer after printing. When the film is covered, an adhesive layer is formed between the adhesive and the ink layer, resulting in stickiness. Can not close or blistering. The glossy pulp is made of resin, dry vegetable oil, drier, etc. The texture is delicate and the film is bright. It has similar properties with the conjugated multi-bond terpene resin as the main component, and they have good affinity and can firmly adsorb the polypropylene film on the ink surface.
Dry oil added to the ink to add dry oil, can speed up the drying of the print, but dry oil plus heavy volume, easy to make the surface of the ink layer into a glossy and smooth low interface layer, the adhesive is difficult to wet and infiltration, affect the film's Fastness, therefore, to control the amount of dry oil.
The dusting and offset printing adopts the dusting process to avoid the dirtying of the printed matter, and the dusting forms a layer of fine particles on the surface of the ink layer. When the film is coated, the adhesive does not adhere to the ink layer in every place, but binds with these powders to form a false-stick phenomenon, which seriously affects the quality of the film. Therefore, the product to be covered should avoid the use of dusting technology, printed matter that has been dusted, and dry wipes on a dry basis with a dry cloth.
The nature of the ink stickiness of the printed product is due to the ink. To solve this problem, the ink must be improved in the process, and the ink is added in proportion to 10% of the stickiness agent, which is very effective for preventing stickiness. After the ink is added with the viscose, it not only prevents stickiness, does not affect the hue and color saturation of the printed product, but also makes the ink layer brighter, the dots are clearer, and it is also more convenient for post-printing processing procedures such as calendering, laminating, hot stamping. Wait. Gram granules can be used as an alternative to dry oil, dusting, and other anti-sticking dirty materials.
Gold and silver ink prints and silver inks are made of metal powders and binders. The distribution and homogeneity of the metal powders in the binder are extremely poor, and the ink layers are easily separated during the drying process. These separated metal powders form a barrier between the ink layer and the adhesive layer, affecting the effective bonding of the two interfaces. After such a product is left for a period of time, wrinkling and blistering may occur. Therefore, the coating of gold and silver ink prints should be avoided.
The dry state of the printed ink layer is covered when the ink is not completely dried. The high boiling point solvent contained in the ink tends to cause the plastic film to expand and elongate. This is the main reason for the blistering and delamination of the product after the film is covered. Full drying of the ink layer is the primary condition for guaranteeing the quality of the film. For products that are imprinted and eagerly coated, they can be dried in an oven.
The influence of the temperature and humidity of the filming shop environment on the quality of the coating film The environmental humidity of the film coating shop affects the quality of the coating film. The main reason is that the moisture content changes with the relative humidity of the air between the adhesive and the plastic film and the printed matter. Humidity-sensitive prints can develop internal stresses due to dimensional changes.
For example, the longitudinal stretch rate of the printed matter is 0.5%, and the longitudinal shrinkage of the BOPP film is 4%. If the water absorption capacity of the printed material is too large and the film is stretched, the internal stress caused by heat shrinkage of the film may cause the film product to curl, tend, and stick. Not together. In addition, in a high humidity environment, the equilibrium moisture content of the printed matter will also change, and the large amount of moisture absorbed from the air medium will be released from the surface during the hot-press compounding process, stagnating at the adhesive interface, and being formed locally. Adhesion phenomenon. Moreover, changes in the balance of moisture in the printed matter (absorbing moisture from the air medium or releasing moisture into the air medium) often occur at the edge of the print, making it a scalloped edge or a tight edge, and it is not easy to form a film with the film during hot press compounding. Good adhesion produces wrinkles, making production unsuccessful.
Laminating Common Faults and Remedy (1) Adhesion Poor and Remedy 1 The adhesive is not properly selected, the amount of glue is not properly set, and the ratio measurement is incorrect. The adhesive brand and coating amount should be re-selected and accurately formulated.
2 The diluent contains hydroxyl-consuming alcohol and water, so that the hydroxyl group of the main agent does not react. High purity (99.5%) ethyl acetate should be used.
3 The print surface has dusting. Wipe gently with a dry cloth.
4 The ink on the print is too thick. Should increase the amount of adhesive coating, increase the pressure.
5 The ink on the printed material is dry or not completely dry. Should be hot-pressed again and then gluing; select a high solid content of the adhesive; increase the adhesive coating thickness; increase the adhesive coating thickness; increase the temperature of the drying path.
6 The adhesive is absorbed by the printing ink and paper, so that the amount of coating is insufficient. The formula and coating amount should be reset.
7 The surface treatment of the plastic film is insufficient or exceeds the pot life, rendering the treated surface ineffective. The set formula and coating amount should be updated.
8 The pressure is low, the speed is fast, and the temperature is low. The film temperature and pressure should be increased and the vehicle speed should be appropriately reduced.
(2) Blistering and repelling method 1 The printing ink layer is not dry. Should be hot-pressed again and then glue; delay filming time, make it completely dry.
2 Printing ink layer is too thick. The amount of adhesive applied should be increased to increase the pressure and the composite temperature.
3 The drying temperature is too high and the adhesive surface is crusted. Drying temperature should be reduced.
4 The surface temperature of the composite roller is too high. The composite roll temperature should be reduced.
5 The film is wrinkled or loose. The film is uneven or curled. Replace the qualified film and adjust the tension.
6 Wrap dust and impurities on the surface of the film. Dust and impurities should be removed.
7 The adhesive is unevenly coated and used in small amounts. Should increase the amount of coating and uniformity.
8 High adhesive concentration, high viscosity, uneven coating. Apply thinner to reduce the binder concentration.
(3) uneven coating and removal methods 1 glue in the tank curing. Replace or add adhesives.
2 The pressure is small. Should increase the compound pressure.
3 Roller swelling, deformation. Replace the roller.
4 Plastic film thickness tolerance. Replace the film and use a film with a small thickness tolerance.
5 The film is slack. Traction should be adjusted.
(4) Wrinkled film and removal method 1 The film transfer roll is not balanced. The transfer roller should be adjusted.
2 The film is inconsistent or wavy at both ends. Taiwan cell membrane should be replaced.
3 The glue layer is too thick and the solvent evaporation is not thorough, which affects the viscosity. It is squeezed by the pressure roller and slips between the paper (print) and the film. The amount of glue should be adjusted to increase the temperature of the drying tunnel.
4 The heating roller and the rubber roller are not even at both ends, and the pressure is inconsistent and the line speed is not equal. Two rollers should be adjusted.
5 The tension is not enough to make the film trend uneven, which can cause the film to wrinkle. The pressure should be adjusted to make it normal.
6 The surface of the paint layer on the film does not dry and can cause the film to wrinkle. Improve the drying temperature to solve.
7 When the temperature is too high, wrinkling of the film can also occur. In the lamination process, the purpose of warming is to soften the film and bond the paper to the plastic film. Fan cooling, turning off the heating wire, or other cooling measures should be taken to restore the temperature to normal as soon as possible.
(5) Corrugated paper and removal methods Papers for coated films are generally coated paper, offset paper, whiteboard paper, and the like. The wrinkling of the paper occurs when the film is covered. Generally, there are the following situations:
1 The temperature and humidity of the workshop are not properly controlled. Relative humidity is too high, the paper suction from the "flounce", causing wrinkling of the paper during the coating process, must strictly control the workshop's temperature and humidity.
2 If the ambient temperature is too high or the film temperature is too high, the paper will “tighten†and cause the paper to wrinkle. Press plates can be used to flatten the number of paper knocks and kneading before coating, and reduce the environment and film temperature.
3 Roller pressure is not uniform, causing the paper to wrinkle during lamination. In this case, correct the roller pressure before starting the operation.
4 The rubber roller itself is uneven, causing the paper in the film to wrinkle. Replace the new rubber roller or grind the old rubber roller and use it again.
5 The dirt on the rubber roller causes the paper to wrinkle when the film is covered. The rubber roller should be cleaned in time. The rubber roller must always be kept clean.
6 If the pulling force is too large, the film is rolled up and torn, causing the paper to wrinkle when it is covered. The tension should be properly adjusted.
7 The paper feed is skewed, causing the paper to wrinkle when it is covered. The operation center must take care to ensure that the paper is delivered flat. (Text / Jin Yin He) ("China Packaging News")
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