Carbon paper gravure plate making technical requirements and test methods
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1. Subject content and scope of application
This standard specifies the technical requirements and test methods for corrosion gravure plate making with carbon paper as the photosensitive material. It is suitable for gravure printing of printed books and packaging products.
2. Reference standard
GB 9851 printing technical terminology
CY/T6 gravure printing quality requirements and test methods
3. Technical requirements
3.1 Carbon paper
3.1.1 Storage environment of non-sensitized carbon paper: room temperature 18 ° C ~ 22 ° C, relative humidity 50% ~ 70%, sealed.
3.1.2 Carbon paper sensitization
3.1.2.1 sensitizer: potassium dichromate (K2Cr2O7) analytically pure.
3.1.2.2 The concentration of sensitizing solution is 3% to 4%.
3.1.2.3 Sensitizing solution temperature 10 ° C ~ 14 ° C.
3.1.2.4 Sensitization time 2.5min ~ 3min.
3.1.2.5 The sensitizing solution has a pH of 4.5 to 6.
3.1.3 Carbon paper drying
3.1.3.1 Drying method: air drying.
3.1.3.2 Drying parameters: cold air is room temperature, hot air is 50 ° C, relative humidity is 60% to 70%, wind speed is 60 to 100 m/min, and drying time is 2.5 to 3 hours. After drying, the carbon paper has a water content of 8% to 12%.
3.1.4 The appearance of carbon paper should be smooth and smooth, no curling, no scratches, no water bubbles or sand holes, and evenly dried.
3.1.5 Storage conditions of carbon paper after sensitization: Store in a metal bucket that is protected from light and moisture, and away from heat sources. The indoor temperature is 18 ° C to 22 ° C, and the relative humidity is 60% to 70%. It can be used after storage for 6 hours and is valid for 3 days.
3.2 printing plate
3.2.1 The peak spectrum of the light source is between 380mm and 550mm. The shape of the light source is a point light source or a tubular light source, and the illumination is uniform.
3.2.2 The printing time is determined experimentally according to the density of the positive image, the intensity of the light source, the distance of the light source and the performance of the carbon paper.
3.2.3 Printing screen
3.2.3.1 Screen material: glass or film.
3.2.3.2 Type of mesh: square, rectangular or irregular.
3.2.3.3 Number of mesh lines: General printed matter 60~70l/cm. Fine prints 70 ~ 80l / cm.
3.2.3.4 Screen specifications: 1040 × 1400mm, 1040 × 700mm.
3.3 version
3.3.1 The hardness of the passing rubber roller is 75°～85° (Shore hardness).
3.3.2 The speed of the plate is 3~5m/min.
3.3.3 Over-plate wetting fluid: distilled water.
3.3.4 through-plate dampening solution temperature 18 ° C ~ 21 ° C
3.4 development
3.4.1 The development technical parameters are shown in Table 1.
Table 1
Item Parameter Stage Carbon paper wetting and plate roll heating Carbon paper release base Development Plate roll cooling
Water temperature °C 25～28 29～38 38～40 21
Time (min) 7～10 5～7 8～15 7
Rolling speed (r/min) 60～70 50～60 110～140 60～70
3.4.2 Development quality requirements: the film is complete, the float is removed, and uniform.
3.5 Corrosion
3.5.1 Ferric chloride standard (industrial grade) is shown in Table 2.
Table 2
kind
content
Ferric chloride (%) ferric chloride (%)
Solid ferric chloride ≥96 ≤2
Liquid ferric chloride ≥45 ≤0.4
3.5.2 The content of copper in ferric chloride solution is 15~25g/l.
3.5.3 The concentration of ferric chloride corrosive liquid is shown in Table 3.
table 3
Corrosion method
Corrosive solution used
Six cups of corrosion 44, 42, 40, 38, 37, 36
Double cup corrosion method 42,38
Single cup corrosion method 38
3.5.4 Corrosion workshop temperature 21±1.5°C, relative humidity 50%～70%. The temperature of the ferric chloride corrosive solution is 21 ± 1 °C.
3.5.5 Corrosion time
Six cups of corrosion time 12 to 17 minutes
Double cup corrosion corrosion time 12~17min
Single cup corrosion method corrosion time 10~15min
3.5.6 Corrosion quality requirements: Corrosion depth: 2 ~ 45μm. Rich in layers, complete mesh wall, in line with printing requirements.
4. Inspection
4.1 Inspection conditions
4.1.1 The working environment is white.
4.2 Inspection form
4.2.1 Inspection by process.
4.3 Inspection instruments or tools.
4.3.1 Mercury thermometer 0 ~ 100 ° C.
4.3.2 Temperature and humidity meter.
4.3.3 Gravity table.
4.3.4 Precision test paper PH value 2.5~7.
4.3.5 Lux table.
4.3.6 Gravure plate roll depth measuring instrument.
4.3.7 Anemometer.
4.3.8 Shore hardness tester.
4.3.9 Tachometer.
4.3.10 Contact thermometer (0 ~ 100 ° C).
4.3.11 Analysis tool for ferric chloride solution and sensitizing solution.
4.3.12 Paper Humidity Tester.
4.4 Inspection method
4.4.1 Measurement method: Measure with instrument or tool.
4.4.2 Visual inspection method: visual inspection by means of a magnifying glass.