3. Determination of ink properties
1) Ink adhesion fastness test
1 The reference standard is GB/T 13217.7-91 GB/T 13217.1-91, and the test is carried out at a temperature of 25±1°C and a humidity of 65%±5%.
2 test results and analysis
The BOPA film was subjected to ion bombardment treatment with a vacuum coating machine for 3 minutes to increase the surface tension of the film. After the comparison experiment with the PET film (see Table 3), the following points can be drawn:
a. Unlike printing materials, the adhesion fastness to ink is different. Lisolol Baohong BK ink is the most affected by the material, and the fastness of 3 materials such as Everlast Red 2B is relatively close, and the attachment fastness is less affected by the material.
b. The fastness of permanent red 2B is better, and the permanent red F4R is the worst.
c. After the ion-treated film material, the attachment fastness to various inks has been significantly improved.
2) Determination of Ink Gloss
1 Reference Standard: GB/T 13217.2-91. The test was performed at a temperature of 25±1°C and a humidity of 65%±5%.
2 test results and analysis
The experimental results show that the order of the glossiness of the three inks is: Yongkanghong 2B> Yongguhong F4R> Lithol Baohong BK. It can also be seen from the table that the glossiness of the ink is not related to the printing material. Some deviations in the data in the table are relatively large. The main reason may be that the ink on the film is not uniform, resulting in different reflectivity to light.
3) Determination of ink fineness
1 Reference Standard: GB/T 13217.2-91. The test was conducted at a temperature of 25>±1°C and a humidity of 65%±5%.
2 test results and analysis
Three samples of each ink were taken and the fineness measurement was: the average fineness of Lisol's BK ink was 4μm, the average fineness of the permanent red F4R ink was 2μm, and the permanent red 2 ink was fine. The average value is 5 μm, and the average value of the fineness of the Jinguanghong C ink is 21 μm.
The results showed that the average fineness of Everfix Red F4R ink and Lithol Baohong BK ink is similar, and the particles of Jinguanghong C ink are relatively hard. In the process of ink preparation, the grinding time should be prolonged.
4) Determination of ink flow
1 Reference standard GB/T14624.3-93, measured at a temperature of 25±1°C and a humidity of 65%±5%.
2 experimental results and analysis
The flowability of the ink was measured by lateral and longitudinal measurements. The mean diameters of the three types of inks were measured. The measurement results were as follows: Lithol Baohong BK was 62mm, permanent red F4R was 58mm, and permanent red 2B was 62.5mm.
Table 2 Ink discoloration under different boiling conditions
Boil conditions 100°C 121°C 121°C 121°C 121°C
40min 15min 30min 15min 30min
Test materials distilled water distilled water distilled water tap water tap water
Jin Guanghong C/PET film 4 1 1 1 1
Everlasting Red F4R/PET film 4 4 4 3 2
Lisol Red BK/PET film 4 3 3 2 2
Everlasting Red 2B/PET Film 5 5 5 3 3
Jin Guanghong 2B/PET film 3 2 1 1 1
Permanent Red F4R/BOPA Film 3 4 4 3 3
Lisol Red BK/BOPA Film 4 4 3 2 2
Permanent Red 2B/BOPA Film 3 4 4 4 4
The experimental results show that the three inks have little difference in fluidity. The flow of Everhold Red 2B ink and Lithol Baohong BK ink is almost the same, slightly better than Everfix Red F4R ink.
5) Ink initial measurement
1 Reference standard: GB/T 13217.5-91, testing at a temperature of 25±1°C and humidity of 65%±5%.
2 experimental results and analysis
The average value of the initial dry length of the three kinds of inks is Lisuo Baohong BK 55.5mm, Everlasting Red F4R 41.5mm, and Everlasting Red 2B 50.5mm.
Table 3 Test results of ink adhesion
Sample Sample 1 Sample 2 Sample 3 Average
experiment material
Everlasting Red F4R/PET film 56.94 55.31 - 56.12
Lisol Red BK/PET Film 100 100 100 100
Everlasting Red 2B/PET Film 99 99 97 98.33
Everlasting Red F4R/BOPA Film 15.28 43.20 27.59 28.69
Lisuerbao red BK/BOPA film 23.56 46.10 - 34.83
Everlasting Red 2B/BOPA Film 67.33 80.23 - 73.78
Everlasting Red F4R/Ion Processing BOPA Film 91.18 97.66 - 94.42
Litholor BK/Ion-treated BOPA film 100 100 100 100
Permanent Red 2B/Ion Treated BOPA Film 100 99 99 99.33
The initial dryness of Lisol's Baohong BK ink is much better than that of the other two inks. The permanent dryness of Everlasting red F4R is the worst.
6) Ink resistance test
1 Reference standards: GB/T13217.8-91, GB/T13217.1-91, test temperature 50 ± 1 °C.
2 test results and analysis
The order of the anti-blocking properties of the three inks was Everfix Red 2B (90)> Everlast Red F4R (40)> Lisol Red BK (15).
The experimental results show that the anti-blocking property of Yongguhong 2B is best.
7) Ink drying speed test
The natural drying speed of the ink was tested under the conditions of a temperature of 19°C and a humidity of 68%, as shown in Table 4.
The test method is to press the coated paper on the ink layer of the film and immediately lift it. There is no ink on the coated paper to dry the ink. In actual production, the printing speed can be adjusted according to the drying characteristics of the ink and the productivity can be improved. The drying speeds of the four inks are slightly different due to the different substrates. Among them, the golden red C ink has a relatively slow drying speed.
in conclusion
Comprehensive performance characteristics of several inks, in the selection of red cooking ink resistance, if the product needs to be subjected to higher temperature treatment (above 100 °C), should try to use the permanent red 28 pigment as a coloring agent; if the initial dryness of the ink And the requirement of adhesion strength is high, and the processing temperature is around 100°C. Litholone BK pigment can be considered as the colorant of the ink; due to the poor fastness of the permanent red F4R pigment ink, it can be used in some pairs. Printing quality and temperature conditions require less application in packaging printing (in the absence of the first two pigments); gold-red C pigments are generally not used as colorants for cooking-resistant inks.
In addition, when preparing experimental inks, it should be noted that Jinguanghong C ink is relatively dilute. After being placed for a period of time, serious stratification will occur. Therefore, the proportion of solvents may be appropriately reduced during the preparation. Jinguanghong C pigments have large particles and the grinding time should be lengthened. Everlasting Red 2B ink is very viscous, adding a solvent when used, the situation will change; or in the preparation of permanent red 2B ink, increase the proportion of solvent.
Table 4 Natural drying time of the test ink (temperature 19°C, humidity 68%)
PET BOPA
Lisol Red BK Pigment Ink 3`50" 4`42"
Permanent Red F4R Pigment Ink 4`02" 5`03"
Permanent Red 2B Pigment Ink 4`23" 3`47"
Gold Red C Pigment Ink 8`00" 10`14"
Source: 21st Century Fine Chemicals Network
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