Technical requirements for offset letterpress prin

Technical conditions of UV excited fluorescent ink (offset and relief printing)

1 scope

this standard specifies the product classification, technical requirements and test methods of UV excited fluorescent ink for offset and relief printing

this standard is applicable to UV excited fluorescent inks used in monochrome and multicolor offset printing machines, numbering machines or relief printing machines

2 reference standard

the provisions contained in the following standards constitute provisions of this standard through reference in this standard. At the time of publication of this standard, the editions shown are valid. All standards will be revised. Parties using this standard should explore the possibility of using the latest editions of the following standards

gb gray scale for color change assessment

gb 730-86 color fastness to light and climate blue wool standard

gb/T 14624.1-93 ink color test method

gb/t 14624.3-93 ink fluidity test method

gb/t 14624.6 ink viscosity increment test method

qb 559-83 ink Fineness Test Method

3 definition

the following definitions are adopted in this standard

3.1 UV excited fluorescent ink

ink that emits fluorescence within the visible light range under the excitation of 254nm and 365nm ultraviolet light

3.2 standard samples

samples used to compare the quality of UV excited fluorescent inks according to national standards

3.3 sample

UV excited fluorescent ink for inspection

3.4 colorless fluorescent inks

UV excited fluorescent inks that do not contain pigments have a colorless or very light color under natural light

3.5 colored fluorescent inks

UV excited fluorescent inks containing pigments have various colors under natural light

4 product classification

4.1 products are divided into two types: colorless fluorescent ink and colored fluorescent ink according to the apparent color under natural light

4.2 the above two types of UV excited fluorescent inks can be divided into several varieties according to the different UV excited luminescent materials. Such as colorless yellow fluorescent ink containing yellow fluorescent material, colorless red fluorescent ink containing red fluorescent material, etc

4.3 product model compilation method

part I ink color part II the number of nanometers of the maximum emission wavelength of fluorescence

(Arabic numerals) (three digits in total)

colorless or white 0 ×××

Red 1 ×××

Yellow 2 ×××

Blue 3 ×××

green 4 ×××

Black 5 ×××

example: the maximum emission wavelength of 520 product fluorescence is 520

1. The product appearance color is red

5 technical requirements

all quality indicators and performance requirements of the product must comply with the provisions of Table 1

Table 1 technical requirements for fluorescent ink project name index appearance color and standard sample approximate fluidity/(M similar to mechanical universal testing machine M ·℃ -1) offset printing 30 ~ 40

embossing 25 ~ 30 fineness/μ M ≤ 15 viscosity increment/40 ℃ ≤ 2 relative fluorescence brightness/%100 ± 10 maximum fluorescence emission wavelength/nm difference from the standard sample ± 5 heat resistance ≥ grade 3 hot water resistance ≥ grade 3 ethanol resistance ≥ grade 3 gasoline resistance ≥ grade 3 light resistance ≥ grade F2

6 test method

6.1 the appearance color shall comply with GB/T 14624.1

6.2 the fluidity shall be in accordance with GB/T 14624.3

6.3 fineness as per QB 559

6.4 viscosity increment shall be in accordance with GB/T 14624.6

6.5 fluorescent brightness test

6.5.1 principle

the fluorescent brightness of UV fluorescent ink refers to the comparison of the brightness of the fluorescence in the visible light range emitted by the printed sample of the sample and the standard sample under the excitation of 254nm or 365nm ultraviolet light. The inspection results are expressed in percentage. This method can be divided into visual test method and instrument test method

6.5.2 visual test method

6.5.2.1 instruments and tools

a) inking knife

b) sample scraper

c) sample paper: no visible fluorescence under 254nm or 365nm ultraviolet light

d) standard white ink

e) analytical balance: the maximum weighing capacity is 100g and the sensing capacity is 1mg

f) weighing slide: 50mm × 50mm × 2mm；

g) 254nm or 365nm ultraviolet light source

6.5.2.2 test steps

a) weigh 2G of standard white ink and 0.2g of standard fluorescent ink on the glass slide with an analytical balance, fully mix the weighed ink sample, weigh the fluorescent ink of the sample in the same way and mix it evenly

b) use an inking knife to take a small amount of standard sample ink and sample ink mixed evenly and apply them to the upper left and right sides of the scraping paper. Then use a sample scraper to scrape the ink sample as shown in the figure

c) place the scraped sample under the same ultraviolet light and visually observe whether the fluorescent brightness of the ink is consistent. In case of inconsistency, change the amount of standard white ink of the sample until the left and right brightness are consistent. Calculate the fluorescent brightness of the sample relative to the standard fluorescent ink according to formula (1)

d) test calculation method s (B/a) × 100%

where: S - fluorescent brightness percentage of the sample (100% of the standard sample)

a - amount of white ink used to dilute the standard sample, G

b - amount of white ink used to dilute the sample, G

6.5.2.3 report

report the excitation wavelength and the relative fluorescence brightness of the sample and the standard sample

6.5.3 instrument measurement method

6.5.3.1 instrument and material

a) printability instrument

b) fluorescence spectrophotometer

c) sample paper: no visible fluorescence under 254nm or 365nm ultraviolet light

d) inking knife

e) blade

6.5.3.2 test steps

a) evenly take the standard sample and sample ink, and make the print sample on the sample paper with the printability instrument under the same conditions. The ink layer thickness is 1 × 2m, natural drying for 24h and then standby

b) cut the above printing sample into 20mm × 30mm rectangle

c) fix the rectangular printed sample on the sample rack of the fluorescence spectrophotometer for measurement, record the spectral data and draw the spectral diagram

d) repeat the experiment and record the data

6.5.3.3 calculation of relative fluorescence brightness

relative fluorescence brightness = [phase fluorescence brightness (theoretical mean)]/[standard sample fluorescence brightness (average)] × 100%

6.5.3.4 report

the excitation wavelength, instrument error value and relative fluorescence brightness of the sample

6.6 determination of maximum emission wavelength of fluorescence

6.6.1 principle

the maximum emission wavelength of UV excited fluorescent ink refers to the wavelength corresponding to the maximum peak value of the spectrum within the visible light range emitted by the UV excited fluorescent ink sample under the UV irradiation with the wavelength of 254nm or 365nm, expressed in nm

6.6.2 apparatus and materials

a) printability apparatus

b) fluorescence spectrophotometer

c) sample paper: no visible fluorescence under 254nm or 365nm ultraviolet light

d) inking knife

e) blade

6.6.3 test steps

6.6.3.1 take the standard sample and sample ink evenly, and make the sample on the sample paper with the printability instrument. The thickness of the ink layer is 1 ~ 2 μ m. After natural drying for 24h, it will be ready for use

6.6.3.2 cut the above printing sample into 20mm × 30mm rectangle

6.6.3.3 fix the rectangular printed sample on the sample rack of the fluorescence spectrophotometer for measurement, and record the number. This is certainly a willing analysis from the control itself, and draw the spectrum diagram

6.6.3.4 repeat the experiment and record the data

6.6.4 report

report excitation wavelength and maximum emission wavelength

6.7 resistance test

6.7.1 heat resistance test method

6.7.1.1 principle

the heat resistance of UV excited fluorescent ink refers to the reduction of fluorescent brightness of ink samples after heating for a period of time. The smaller the change, the better the patience, otherwise the worse

6.7.1.2 instruments and materials

a) blast drying oven

b) printability instrument

c) sample paper: no visible fluorescence under 254nm or 365nm ultraviolet light

d) inking knife

e) blade

6.7.1.3 test temperature 100 ℃± 2 ℃

6.7.1.4 test steps

a) evenly take the ink and make the ink layer with a thickness of 1 ~ 2 on the printability instrument μ N, and wait for use after natural drying for 24h

b) cut the printed sample into 20mm × 30mm rectangle, two in total

c) put one cut sample into a blast drying oven, the temperature is 100 ℃± 2 ℃, and the heating time is 30min. After taking it out, place it naturally to room temperature, and compare it with the other one

6.7.1.5 rating

place the above two cut samples under the same UV light source for observation, which is divided into five levels:

5: no change in fluorescence

4 grade: the fluorescence is slightly weakened

3 grade: the fluorescence decreased significantly

2: only fluorescent traces

1: fluorescence disappeared

6.7.1.6 report

report the rating results, temperature and time

6.7.2 hot water resistance test

6.7.2.1 principle

hot water resistance refers to the reduction of fluorescent brightness of UV excited fluorescent ink samples after soaking in hot water for a certain time. The length and sectional area after fracture are measured. The smaller the change is, the better the tolerance is; on the contrary, the worse the tolerance is

6.7.2.2 apparatus and materials

a) printability apparatus

b) sample paper: no visible fluorescence under 254nm or 365nm ultraviolet light

c) electric thermostatic water bath

d) glass beaker

e) tweezers

f) filter paper

6.7.2.3 test conditions

the test is carried out under the condition of water bath heating, and the test solution temperature is 80 ℃± 2 ℃

6.7.2.4 test steps

a) evenly take the ink and make the ink layer with a thickness of 1 ~ 2 on the printability instrument μ M, and wait for use after natural drying for 24h

b) cut the printed sample into 20mm × 30mm rectangle, two in total

c) put one cut sample into 50ml of 80 ℃ hot water under bath insulation for 30min, take it out and dry it on the filter paper, and compare it with the other one

6.7.2.5 rating

place the above two cut samples under the same UV light source for observation, which is divided into five levels:

5: no change in fluorescence

4 grade: the fluorescence is slightly weakened

3 grade: the fluorescence decreased significantly

2: only fluorescent traces

1: fluorescence disappeared

6.7.2.6 report

report the rating results, soaking temperature and time

6.7.3 ethanol resistance test

6.7.3.1 principle

ethanol resistance refers to the degree of weakening of fluorescent brightness of UV excited fluorescent ink samples after soaking in ethanol for a certain time. The smaller the change, the better the patience, otherwise the worse

6.7.3.2 apparatus and materials

a) printability apparatus

b) sample paper: no visible fluorescence under 254 nm or 365nm ultraviolet light in China

c) glass beaker

d) 95% chemical pure ethanol

e) tweezers

f) filter paper

6.7.3.3 test conditions

the test is carried out at normal temperature, and the test solution temperature is 25 ℃± 2 ℃

6.7.3.4 test steps

a) take invalid ink, and make an ink layer with a thickness of 1 ~ 2 on the printability instrument μ M, and wait for use after natural drying for 24h

b) cut the printed sample into 20mm × 30mm rectangle, two parts in total

c) soak one cut sample in ethanol solution for 30min, take it out and dry it on filter paper, and compare it with the other

6.7.3.5 rating

place the above two cut samples under the same UV light source for observation, which is divided into five levels:

5: no change in fluorescence

level 4