Packaging trademark screen printing process
2019-10-01 16:04:53
First, prepress design and plate production
Packaging trademark screen printing process, basically can be divided into prepress design, plate production, screen printing and postpress processing 4 parts, pay attention to the operation of various processes, in order to ensure the printing quality.
1. Prepress design
In the design of packaging trademarks, designers must be familiar with platemaking and printing processes, and post-press processing technology. Whether the clearly designed packaging works meets the requirements of platemaking and printing processes. The design of the general packaging trademark requires simple and neat, suitable for printing; for some high-end packaging, or products with special design requirements, special processing must be organized for post-press processing to meet the requirements of customers and designers.
Since the printed and used materials of packaging trademarks are completely different from the printing processes of general books and publications, in the design of screen printing and packaging trademarks, the characteristics of the use of packaging trademarks and printing techniques must be fully considered.
2. Problems to be Noted in Plate Production Design
For screen printing and packaging trademarks, due to the difference between screen printing and other printing, the production technology and design of the bottom plate are not the same. The following issues should be noted:
(1) Multi-map joint design.
The combination of one version and one figure requires that the accuracy of overlay printing must be high. Manually linked to the sun can easily cause serious loss of outlets and overprinting is inaccurate. Although the use of linkage drying machines solves the problem of overprinting accuracy, the problem of network loss can not be solved fundamentally; the color desktop system makes the past cumbersome manual production easy and solves the problem of network loss. And overprinting problems.
(2) Hollow and mosaic designs.
Packaging trademark platemaking often encounters processes that require hollowing out and inlaying. In particular, when the manuscript drawing needs to be printed with gold and silver, the printing plate must be made into a hollow mosaic. Otherwise, the problem of insufficient ink and dark colors may be caused. .
(3) box shape design.
Die-cutting is an indispensable process for a packaging label printing factory. The die-cutting dimensions are required to be precise, and the design of the box-shaped dimensions is a guarantee. Therefore, in the process of platemaking, the box-shaped dimensions provided by the customer, the thickness of the sheet of the substrate, the size of the box, the shape of the folded sheet, etc. should be used for variable processing of the size of the box-shaped structure to produce an accurate multi-joint model. Knife wire version. At present, ready-made packaging box-shaped design software is available abroad. It is understood that the domestic Peking University Founder, Tsinghua Unisplendour, etc. have developed a box-shaped design software.
3. Problems to be Noted in Making Screen Printing Plates by Direct Plate Making
In the packaging trademark screen printing, the commonly used plate making method is the direct plate making method. The manufacturing process and technical problems that should be noted are as follows:
(1) Basic process characteristics of the direct plate making method. The process flow for making screen printing plates directly with sensitizing emulsions is: screen degreasing → screen drying → coating sensitized films → stencil drying → stencil replenishing sizing → stencil drying → exposure → developing → stencil drying → checking revise.
(2) Emulsion coating points. The photosensitive layer of the stencil must be uniform, the emulsion completely covers the screen, and the adhesive layer on the printed surface should be thicker. The stencil printing surface is first coated 1 to 2 times, and then immediately applied on the squeegee surface 2 to 4 times, wet to wet and then dried. After drying, it is coated one or two times on the printed surface to make the photosensitive layer reach the final required thickness. Each sizing must be performed after the previous adhesive layer has dried. The number of gluing is determined by the printing requirements and screen fineness.
Second, the screen printing of packaging trademarks
1. The choice of screen printing method
There are four types of screen printing, flat-pressing, flat-pressing, round-pressing, and round-pressing (ie, rotary screen printing). In order to improve packaging and product identification, advanced screen printing Decorative, online rotary screen printing unit can be used. This will not reduce the speed of packaging and printing production lines, but also get the decorative effect of screen printing. In rotary screen printing, the screen plate is made into a hollow roller screen plate, and the squeegee system of the automatic ink supply device is installed in the screen plate roller, and then the screen printing is completed by adjusting the blade angle and pressure. An ink sensor is installed in the screen plate cylinder. In the production, once the ink volume is insufficient, ink is automatically supplied by the ink pump. Rotary screen printers use an efficient UV drying system, the normal printing speed can reach 60m/min.
2. Packaging trademark screen printing features
1 Paper size is not fixed. The characteristics of the packaging trademark determine the size of the print paper is difficult to fix. This requires the production schedule to place the same number of printed manuscripts in the same batch as possible when arranging print jobs. Because for printers, often changing rules, both labor and money.
2 The paper is of different thickness. Due to the wide variety of packaging trademarks, the variety and thickness of printing papers vary, causing great difficulties for printing operations. Different thicknesses of paper require constant pressure adjustment; there are many types of paper, and the chance of failure is high, and problems may occur at any time due to paper change.
3 The quality of the ink is high. The packaging brand emphasizes the display effect. A row of packaging products should be dazzling and consistent in color. This requires that printing should be accurate when printing. Therefore, the printing operator must master the ink mixing technology and understand the color matching relationship between inks. Spot color printing ink should be sufficient, hue should be accurate, large ink can not have defects, not sticky pages.
4 Prepress, printing, and postpress rules must be the same. Packaging trademark printing often has post-printing processes that require deep processing, such as hot stamping of anodized aluminum, embossing, die-cutting and indentation. Therefore, when printing, it is necessary to pay attention to the same batch of printing operations. The rules of each procedure must be consistent. Otherwise, the following procedures will fail and continue to produce. Therefore, when printing, the left and right sides of the printing plate and the back of the printing plate have to be scribed so that the printing process can always check whether the printing mark is consistent or not.
Third, after the printing of packaging trademarks
The post-press processing of packaging trademark printing mainly refers to processes such as coating, laminating, hot stamping of electro-aluminum, engraving letterpress, die-cutting indentation, stamping and corrugating, and gluing. The following is a brief description of its main process features.
1. Polishing. The glazing methods include the printing machine's coating, cast glazing, ultraviolet glazing, varnish and Cuban glazing, etc. Various glazing methods have their own characteristics.
2. Cover film. Packaging film is divided into two kinds of light film and matte film. Due to the large number of spot colors and thick ink layers in the box, the amount of powder to be sprayed is increased in order to prevent stickiness during printing. This has a great influence on the quality of the film. Before the film is covered, it must be wiped clean with a soft cloth. , bubble, white anti-bottom and other phenomena. In addition, special attention should also be paid to the area of ​​the front side of the printing, and the film cannot be ejected. Otherwise, the die-cutting accuracy will be affected.
3. Hot stamping anodized aluminum. Hot stamping anodized aluminum is a more common procedure for the processing of packaging trademarks after printing. The general requirement of hot stamping is not to paste, not to wear, not to spend, not to lose lead. Damoji printing should pay attention to layout vitrification, otherwise it will affect the quality of hot aluminum. Hot aluminum is good or bad, temperature is the key.
4. Engraving relief. Engraving letterpress is also called embossing. The embossing should pay attention to the following two points: 1 engraving version should pay attention to the sense of hierarchy, three-dimensional sense, subtle levels and clear lines. 2 When the embossing operation, the plaster mold should reflect all the lines on the original engraving plate. High-quality embossing uses hot-pressing. The advantage is that the embossed embossment is not deformed and has a level and three-dimensional appearance.
5. Die-cut indentation. The quality of the die-cut indentation is the key to the quality of the packaging brand.
6. 裱 裱 楞 楞. Corrugated clays are generally classified into type A, type B and type E by the height and width of the corrugated medium. A-type corrugated iron is mostly used for outer packaging, while B-type and E-type are mostly used for medium and small packages. At present, E-color corrugated paper boxes are more popular and are generally used for gift packaging, wine packaging, small household appliances, and glassware packaging. The quality of corrugated board is mainly manifested in: corrugated board should be straight, glue is even, adhesive, impenetrable, corrugated board is straight and not bent.
7 paste box. Paste box is the last process of packaging printing, divided into manual and mechanical methods. The mechanical gluing box is fast and of good quality. The folder-gluer is one of the necessary post-processing equipments for large and medium-sized packaging and printing companies.
Packaging trademark screen printing process, basically can be divided into prepress design, plate production, screen printing and postpress processing 4 parts, pay attention to the operation of various processes, in order to ensure the printing quality.
1. Prepress design
In the design of packaging trademarks, designers must be familiar with platemaking and printing processes, and post-press processing technology. Whether the clearly designed packaging works meets the requirements of platemaking and printing processes. The design of the general packaging trademark requires simple and neat, suitable for printing; for some high-end packaging, or products with special design requirements, special processing must be organized for post-press processing to meet the requirements of customers and designers.
Since the printed and used materials of packaging trademarks are completely different from the printing processes of general books and publications, in the design of screen printing and packaging trademarks, the characteristics of the use of packaging trademarks and printing techniques must be fully considered.
2. Problems to be Noted in Plate Production Design
For screen printing and packaging trademarks, due to the difference between screen printing and other printing, the production technology and design of the bottom plate are not the same. The following issues should be noted:
(1) Multi-map joint design.
The combination of one version and one figure requires that the accuracy of overlay printing must be high. Manually linked to the sun can easily cause serious loss of outlets and overprinting is inaccurate. Although the use of linkage drying machines solves the problem of overprinting accuracy, the problem of network loss can not be solved fundamentally; the color desktop system makes the past cumbersome manual production easy and solves the problem of network loss. And overprinting problems.
(2) Hollow and mosaic designs.
Packaging trademark platemaking often encounters processes that require hollowing out and inlaying. In particular, when the manuscript drawing needs to be printed with gold and silver, the printing plate must be made into a hollow mosaic. Otherwise, the problem of insufficient ink and dark colors may be caused. .
(3) box shape design.
Die-cutting is an indispensable process for a packaging label printing factory. The die-cutting dimensions are required to be precise, and the design of the box-shaped dimensions is a guarantee. Therefore, in the process of platemaking, the box-shaped dimensions provided by the customer, the thickness of the sheet of the substrate, the size of the box, the shape of the folded sheet, etc. should be used for variable processing of the size of the box-shaped structure to produce an accurate multi-joint model. Knife wire version. At present, ready-made packaging box-shaped design software is available abroad. It is understood that the domestic Peking University Founder, Tsinghua Unisplendour, etc. have developed a box-shaped design software.
3. Problems to be Noted in Making Screen Printing Plates by Direct Plate Making
In the packaging trademark screen printing, the commonly used plate making method is the direct plate making method. The manufacturing process and technical problems that should be noted are as follows:
(1) Basic process characteristics of the direct plate making method. The process flow for making screen printing plates directly with sensitizing emulsions is: screen degreasing → screen drying → coating sensitized films → stencil drying → stencil replenishing sizing → stencil drying → exposure → developing → stencil drying → checking revise.
(2) Emulsion coating points. The photosensitive layer of the stencil must be uniform, the emulsion completely covers the screen, and the adhesive layer on the printed surface should be thicker. The stencil printing surface is first coated 1 to 2 times, and then immediately applied on the squeegee surface 2 to 4 times, wet to wet and then dried. After drying, it is coated one or two times on the printed surface to make the photosensitive layer reach the final required thickness. Each sizing must be performed after the previous adhesive layer has dried. The number of gluing is determined by the printing requirements and screen fineness.
Second, the screen printing of packaging trademarks
1. The choice of screen printing method
There are four types of screen printing, flat-pressing, flat-pressing, round-pressing, and round-pressing (ie, rotary screen printing). In order to improve packaging and product identification, advanced screen printing Decorative, online rotary screen printing unit can be used. This will not reduce the speed of packaging and printing production lines, but also get the decorative effect of screen printing. In rotary screen printing, the screen plate is made into a hollow roller screen plate, and the squeegee system of the automatic ink supply device is installed in the screen plate roller, and then the screen printing is completed by adjusting the blade angle and pressure. An ink sensor is installed in the screen plate cylinder. In the production, once the ink volume is insufficient, ink is automatically supplied by the ink pump. Rotary screen printers use an efficient UV drying system, the normal printing speed can reach 60m/min.
2. Packaging trademark screen printing features
1 Paper size is not fixed. The characteristics of the packaging trademark determine the size of the print paper is difficult to fix. This requires the production schedule to place the same number of printed manuscripts in the same batch as possible when arranging print jobs. Because for printers, often changing rules, both labor and money.
2 The paper is of different thickness. Due to the wide variety of packaging trademarks, the variety and thickness of printing papers vary, causing great difficulties for printing operations. Different thicknesses of paper require constant pressure adjustment; there are many types of paper, and the chance of failure is high, and problems may occur at any time due to paper change.
3 The quality of the ink is high. The packaging brand emphasizes the display effect. A row of packaging products should be dazzling and consistent in color. This requires that printing should be accurate when printing. Therefore, the printing operator must master the ink mixing technology and understand the color matching relationship between inks. Spot color printing ink should be sufficient, hue should be accurate, large ink can not have defects, not sticky pages.
4 Prepress, printing, and postpress rules must be the same. Packaging trademark printing often has post-printing processes that require deep processing, such as hot stamping of anodized aluminum, embossing, die-cutting and indentation. Therefore, when printing, it is necessary to pay attention to the same batch of printing operations. The rules of each procedure must be consistent. Otherwise, the following procedures will fail and continue to produce. Therefore, when printing, the left and right sides of the printing plate and the back of the printing plate have to be scribed so that the printing process can always check whether the printing mark is consistent or not.
Third, after the printing of packaging trademarks
The post-press processing of packaging trademark printing mainly refers to processes such as coating, laminating, hot stamping of electro-aluminum, engraving letterpress, die-cutting indentation, stamping and corrugating, and gluing. The following is a brief description of its main process features.
1. Polishing. The glazing methods include the printing machine's coating, cast glazing, ultraviolet glazing, varnish and Cuban glazing, etc. Various glazing methods have their own characteristics.
2. Cover film. Packaging film is divided into two kinds of light film and matte film. Due to the large number of spot colors and thick ink layers in the box, the amount of powder to be sprayed is increased in order to prevent stickiness during printing. This has a great influence on the quality of the film. Before the film is covered, it must be wiped clean with a soft cloth. , bubble, white anti-bottom and other phenomena. In addition, special attention should also be paid to the area of ​​the front side of the printing, and the film cannot be ejected. Otherwise, the die-cutting accuracy will be affected.
3. Hot stamping anodized aluminum. Hot stamping anodized aluminum is a more common procedure for the processing of packaging trademarks after printing. The general requirement of hot stamping is not to paste, not to wear, not to spend, not to lose lead. Damoji printing should pay attention to layout vitrification, otherwise it will affect the quality of hot aluminum. Hot aluminum is good or bad, temperature is the key.
4. Engraving relief. Engraving letterpress is also called embossing. The embossing should pay attention to the following two points: 1 engraving version should pay attention to the sense of hierarchy, three-dimensional sense, subtle levels and clear lines. 2 When the embossing operation, the plaster mold should reflect all the lines on the original engraving plate. High-quality embossing uses hot-pressing. The advantage is that the embossed embossment is not deformed and has a level and three-dimensional appearance.
5. Die-cut indentation. The quality of the die-cut indentation is the key to the quality of the packaging brand.
6. 裱 裱 楞 楞. Corrugated clays are generally classified into type A, type B and type E by the height and width of the corrugated medium. A-type corrugated iron is mostly used for outer packaging, while B-type and E-type are mostly used for medium and small packages. At present, E-color corrugated paper boxes are more popular and are generally used for gift packaging, wine packaging, small household appliances, and glassware packaging. The quality of corrugated board is mainly manifested in: corrugated board should be straight, glue is even, adhesive, impenetrable, corrugated board is straight and not bent.
7 paste box. Paste box is the last process of packaging printing, divided into manual and mechanical methods. The mechanical gluing box is fast and of good quality. The folder-gluer is one of the necessary post-processing equipments for large and medium-sized packaging and printing companies.
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