As the saying goes: “People wear clothes and horses to dress saddlesâ€, and the packaging of goods has become a problem that many manufacturers pay attention to. With the increasing demands of people, the use of film-covering technology is widely used in outer packaging, which makes products colorful and dazzling, which greatly arouses consumers' desire to purchase. However, due to factors such as materials, process technology, equipment, and environment, the film coating process will cause blistering, wrinkling, ink retraction, and film peeling. Here we talk about how to avoid the development of these phenomena.
Our factory is the only manufacturer in Huaibei district that integrates packaging and printing. It is also home to the famous Anhui Kouzi Group. It sells tens of thousands of tons of series of mouth wine each year. Its packaging is not only large in quantity but also strict in quality requirements. In the initial cover of the Wine Box, there were air bubbles, wrinkles, and some peeling off and other abnormal phenomena.
After this phenomenon appeared, it immediately caught the attention of the factory's quality management personnel. After detailed analysis by technicians, the reasons are generally as follows:
1, the printing material itself
Paper as a print, its own nature, the performance of the ink, the density of printed graphics, etc., all affect the quality of the film. If you use a poorly formed paper to print, due to the size of the ink absorption in the web, the speed of the absorption rate is inconsistent; it will cause the paper tightness, evenness, smoothness, moisture quantitative change. If the printed ink layer is too thick, the adhesive molecules will have poor wetting, diffusion, and penetration. The movement of molecules between them will be relatively inactive, and the mechanical bonding force will be small. In addition, in the printing process, in order to make the prints not to be stenciled, kerosene is often added to the ink, so that the ink layer is quickly congealed, resulting in crystallization of the ink layer surface, the print surface is smooth, tough, loses adhesion, adhesive can not be Humidity and affinity seriously affect the adhesion fastness.
2. Effect of process operation and printing environment on film quality
When laminating the product, first apply a layer of adhesive on the surface of the plastic film. After the drying treatment, the adhesive cannot meet the requirements for lamination. In this case, the solvent is diluted to increase the concentration of the binder in order to obtain fast drying. However, if the moisture content is too high, bubbles with air are liable to appear when the film is pressurized, and then peeling off occurs. At the same time, the film easily adsorbs substances such as grease, moisture, and dust in the air, thereby reducing its surface function. Excessive humidity can also affect the volatilization of the solvent in the adhesive. Too much residual solvent will produce air separation in the film, making it impossible to stick the film. At the same time, uneven roller pressure, unevenness of the roller itself and dirt on the roller will cause wrinkling when the film is covered.
How to eliminate the above fault?
First, there is a bad situation
1, improper use of adhesives, improperly set the amount of glue, ratio measurement error. The type and amount of adhesive should be reselected.
2. The diluent contains alcohol and water that consume NCO groups so that the hydroxyl groups of the main agent do not react. High-purity ethyl acetate should be used.
3, the print surface has sprayed powder. Wipe gently with a dry cloth.
4, the print ink layer is too thick. Adhesive coating arrangements should be added to increase the pressure.
5, printing ink layer is not dry or not completely dry. Should be hot-pressed again and then gluing; choose a high solid content of the adhesive; increase the adhesive coating thickness; increase the drying temperature and so on.
6, the adhesive is absorbed by printing ink and paper, so that the amount of coating is insufficient. Should be re-formulated and set the amount of coating.
7, plastic film surface treatment is not enough or beyond the application period, so that the treatment surface failure. Plastic film should be replaced.
8, the pressure is too small, the speed is faster, the temperature is low. The film temperature and pressure should be increased and the vehicle speed should be appropriately reduced.
Second, there is blistering
1, printing ink is dry. Should be hot pressed again and then glue; delay filming time, make it completely dry.
2, the printing ink layer is too thick. The amount of adhesive applied should be increased to increase the pressure and the composite temperature.
3, drying temperature is too high, the adhesive surface crust. 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 has wrinkles or relaxation phenomenon, uneven film or curling. Replace the film and adjust the tension.
6, dust and impurities on the surface of the film. Should be promptly removed.
7, uneven adhesive coating, the amount of less. Should increase the amount of coating and uniformity.
8, the binder concentration is too high, viscosity, uneven coating. Apply thinner to reduce the binder concentration.
Third, film wrinkling
1. The film transfer roller is not balanced. Should adjust the delivery stick.
2. Inconsistent or undulating edges of the film at both ends. Replace qualified film.
3, the glue layer is too thick, the solvent evaporation is not thorough, affecting the viscosity, squeezed by the pressure roller, the paper and the film slide. The amount of glue should be adjusted to increase the temperature of the drying tunnel.
4, the electric roller and the rubber roller are not balanced at both ends, the pressure is inconsistent, and the line speed is not equal. Should adjust two rollers
Our factory is the only manufacturer in Huaibei district that integrates packaging and printing. It is also home to the famous Anhui Kouzi Group. It sells tens of thousands of tons of series of mouth wine each year. Its packaging is not only large in quantity but also strict in quality requirements. In the initial cover of the Wine Box, there were air bubbles, wrinkles, and some peeling off and other abnormal phenomena.
After this phenomenon appeared, it immediately caught the attention of the factory's quality management personnel. After detailed analysis by technicians, the reasons are generally as follows:
1, the printing material itself
Paper as a print, its own nature, the performance of the ink, the density of printed graphics, etc., all affect the quality of the film. If you use a poorly formed paper to print, due to the size of the ink absorption in the web, the speed of the absorption rate is inconsistent; it will cause the paper tightness, evenness, smoothness, moisture quantitative change. If the printed ink layer is too thick, the adhesive molecules will have poor wetting, diffusion, and penetration. The movement of molecules between them will be relatively inactive, and the mechanical bonding force will be small. In addition, in the printing process, in order to make the prints not to be stenciled, kerosene is often added to the ink, so that the ink layer is quickly congealed, resulting in crystallization of the ink layer surface, the print surface is smooth, tough, loses adhesion, adhesive can not be Humidity and affinity seriously affect the adhesion fastness.
2. Effect of process operation and printing environment on film quality
When laminating the product, first apply a layer of adhesive on the surface of the plastic film. After the drying treatment, the adhesive cannot meet the requirements for lamination. In this case, the solvent is diluted to increase the concentration of the binder in order to obtain fast drying. However, if the moisture content is too high, bubbles with air are liable to appear when the film is pressurized, and then peeling off occurs. At the same time, the film easily adsorbs substances such as grease, moisture, and dust in the air, thereby reducing its surface function. Excessive humidity can also affect the volatilization of the solvent in the adhesive. Too much residual solvent will produce air separation in the film, making it impossible to stick the film. At the same time, uneven roller pressure, unevenness of the roller itself and dirt on the roller will cause wrinkling when the film is covered.
How to eliminate the above fault?
First, there is a bad situation
1, improper use of adhesives, improperly set the amount of glue, ratio measurement error. The type and amount of adhesive should be reselected.
2. The diluent contains alcohol and water that consume NCO groups so that the hydroxyl groups of the main agent do not react. High-purity ethyl acetate should be used.
3, the print surface has sprayed powder. Wipe gently with a dry cloth.
4, the print ink layer is too thick. Adhesive coating arrangements should be added to increase the pressure.
5, printing ink layer is not dry or not completely dry. Should be hot-pressed again and then gluing; choose a high solid content of the adhesive; increase the adhesive coating thickness; increase the drying temperature and so on.
6, the adhesive is absorbed by printing ink and paper, so that the amount of coating is insufficient. Should be re-formulated and set the amount of coating.
7, plastic film surface treatment is not enough or beyond the application period, so that the treatment surface failure. Plastic film should be replaced.
8, the pressure is too small, the speed is faster, the temperature is low. The film temperature and pressure should be increased and the vehicle speed should be appropriately reduced.
Second, there is blistering
1, printing ink is dry. Should be hot pressed again and then glue; delay filming time, make it completely dry.
2, the printing ink layer is too thick. The amount of adhesive applied should be increased to increase the pressure and the composite temperature.
3, drying temperature is too high, the adhesive surface crust. 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 has wrinkles or relaxation phenomenon, uneven film or curling. Replace the film and adjust the tension.
6, dust and impurities on the surface of the film. Should be promptly removed.
7, uneven adhesive coating, the amount of less. Should increase the amount of coating and uniformity.
8, the binder concentration is too high, viscosity, uneven coating. Apply thinner to reduce the binder concentration.
Third, film wrinkling
1. The film transfer roller is not balanced. Should adjust the delivery stick.
2. Inconsistent or undulating edges of the film at both ends. Replace qualified film.
3, the glue layer is too thick, the solvent evaporation is not thorough, affecting the viscosity, squeezed by the pressure roller, the paper and the film slide. The amount of glue should be adjusted to increase the temperature of the drying tunnel.
4, the electric roller and the rubber roller are not balanced at both ends, the pressure is inconsistent, and the line speed is not equal. Should adjust two rollers
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Jinan Tri-Tiger Technology Development Co., Ltd , https://www.jinanfurniture.com