The three major types of inks commonly found on the market are polyamide-type surface inks, chlorinated polypropylene-type composite inks, and polyurethane inks. Different substrates choose the corresponding ink. Printed BOPP use chlorinated polypropylene composite ink, if you do not need to compound, use polyamide type of surface printing ink, if you choose general purpose polyurethane ink to print BOPP, not only high cost, adhesion fastness can not meet the requirements.
NY, PET film must be printed with polyurethane ink, if chlorinated polypropylene ink printing composite, prone to low peel strength, high temperature delamination and other failures. Polyamide inks have excellent adhesion to PE film, but they can only be used for general dry packaging. When making high temperature, oil and water resistant packaging, such as milk film and bottle label, polyurethane ink should be used.
There are several basic indicators of ink is our color printing company should detect: viscosity, fineness, hue, fastness.
The required test tools include scraper bars (contrast hue, adhesion test), 3# Chaenhuai (viscosity), fineness plate (fineness). When measuring the viscosity, it is best to dilute to a specific viscosity (for example, 18 seconds/25°C) with an appropriate mixed solvent to calculate the amount of solvent added. This eliminates the "false viscosity" phenomenon that some inks may bring. It's thick, but it doesn't add any solvent.)
The detection of the adhesion fastness can use the national standard (GB/T 13217.7-91), but it may not be enough for some surface printing inks. It is better to simulate the specific requirements of the product packaging and post-processing conditions for testing.
The quality of solvent quality directly affects the quality of ink printing, but for general SMEs, solvent quality is the most difficult to grasp. The main indicators for distinguishing the quality of the solvent are purity and moisture content. Quantitative qualitative detection of the solvent is best detected by chromatography, but the required instrument price is more expensive and the technical requirements are higher.
If light is for printing, dry compounding processes are not taken into consideration. Here are a few simple and practical methods. Look at the appearance of the solvent. At the very least, it should be clarified and transparent. If there is turbidity or floating material, the batch of solvent should be used with caution.
After smelling the odor of the solvent, the operator usually has a general impression of the odor of a particular solvent after a relatively long period of exposure to commonly used solvents. If the odor of the batch of solvents is found to be not pure, it can be confirmed that the batch of solvents is not of high purity and impurities. many.
Use the dissolving effect of different principles to roughly determine the content of water in the solvent: Take a large half cup of clear toluene solvent with a 100 ml glass graduated cylinder, take a small amount of solvent such as esters or ketones to be tested, and pour the toluene into the solvent. Into the toluene, observe the presence of turbidity (milky white) phenomenon, if any, the water content in the solvent is seriously exceeded, experience shows that when the water exceeds 0.5%, this phenomenon is very obvious. The moisture content of the benzene solvent can be determined by drawing a solvent through a long glass tube and observing whether there is delamination.
There are many factors that affect the quality of printing. How can we better grasp the quality of printed matter? Each color printing company has its own management method. The quality control of raw materials is the most basic and critical process requirement in the color printing process. It is difficult to imagine that unqualified or inappropriate raw materials can guarantee the production of quality-compliant printing products. Therefore, our color printing companies must have long-lasting and effective measures. The quality of raw materials. (Finish)
NY, PET film must be printed with polyurethane ink, if chlorinated polypropylene ink printing composite, prone to low peel strength, high temperature delamination and other failures. Polyamide inks have excellent adhesion to PE film, but they can only be used for general dry packaging. When making high temperature, oil and water resistant packaging, such as milk film and bottle label, polyurethane ink should be used.
There are several basic indicators of ink is our color printing company should detect: viscosity, fineness, hue, fastness.
The required test tools include scraper bars (contrast hue, adhesion test), 3# Chaenhuai (viscosity), fineness plate (fineness). When measuring the viscosity, it is best to dilute to a specific viscosity (for example, 18 seconds/25°C) with an appropriate mixed solvent to calculate the amount of solvent added. This eliminates the "false viscosity" phenomenon that some inks may bring. It's thick, but it doesn't add any solvent.)
The detection of the adhesion fastness can use the national standard (GB/T 13217.7-91), but it may not be enough for some surface printing inks. It is better to simulate the specific requirements of the product packaging and post-processing conditions for testing.
The quality of solvent quality directly affects the quality of ink printing, but for general SMEs, solvent quality is the most difficult to grasp. The main indicators for distinguishing the quality of the solvent are purity and moisture content. Quantitative qualitative detection of the solvent is best detected by chromatography, but the required instrument price is more expensive and the technical requirements are higher.
If light is for printing, dry compounding processes are not taken into consideration. Here are a few simple and practical methods. Look at the appearance of the solvent. At the very least, it should be clarified and transparent. If there is turbidity or floating material, the batch of solvent should be used with caution.
After smelling the odor of the solvent, the operator usually has a general impression of the odor of a particular solvent after a relatively long period of exposure to commonly used solvents. If the odor of the batch of solvents is found to be not pure, it can be confirmed that the batch of solvents is not of high purity and impurities. many.
Use the dissolving effect of different principles to roughly determine the content of water in the solvent: Take a large half cup of clear toluene solvent with a 100 ml glass graduated cylinder, take a small amount of solvent such as esters or ketones to be tested, and pour the toluene into the solvent. Into the toluene, observe the presence of turbidity (milky white) phenomenon, if any, the water content in the solvent is seriously exceeded, experience shows that when the water exceeds 0.5%, this phenomenon is very obvious. The moisture content of the benzene solvent can be determined by drawing a solvent through a long glass tube and observing whether there is delamination.
There are many factors that affect the quality of printing. How can we better grasp the quality of printed matter? Each color printing company has its own management method. The quality control of raw materials is the most basic and critical process requirement in the color printing process. It is difficult to imagine that unqualified or inappropriate raw materials can guarantee the production of quality-compliant printing products. Therefore, our color printing companies must have long-lasting and effective measures. The quality of raw materials. (Finish)
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