Does UV flexo ink have insufficient adhesion on non-woven?
Date: Jul 13 2024 From: Star Color
UV flexo ink has been widely used in the printing industry due to its advantages of high efficiency, energy saving, solvent-free emissions, and environmental protection. However, in specific application scenarios, there may still be occasional adhesion issues when printing non absorbent vegetables such as non-woven fabrics. Let's take a look at the reasons for the insufficient adhesion of UV flexographic ink on non-woven fabrics.
1、 Insufficient corona treatment on the surface of the film
The surface tension of non-woven fabric is one of the key factors affecting ink adhesion. Generally speaking, in order to achieve good adhesion of ink, the surface tension of non-woven fabric needs to reach 3.8x10 ^ -2N/m or more. If the degree of corona treatment is not sufficient, the surface tension of the non-woven fabric will not be able to meet this requirement, resulting in the ink not being able to firmly adhere to the substrate.
Solution: Enhance the corona treatment degree of non-woven fabric to ensure that the surface tension meets the standard requirements. In addition, regularly inspect and maintain corona treatment equipment to ensure it is in optimal working condition.
2、 Insufficient curing degree of UV ink
The curing degree of UV ink directly affects its adhesion. If the ink is not completely cured, a stable network structure cannot be formed between its molecules, resulting in a decrease in adhesion. In the process of non-woven printing, due to the special nature of the substrate, the curing of UV ink may be affected by various factors, such as insufficient light source power and aging of UV lamps.
Solution: Ensure that the UV light source has sufficient power and the correct UV light emission wavelength, and replace aging UV lamps in a timely manner. At the same time, adjust the curing time and distance according to the ink type and printing substrate to ensure complete curing of the ink.
3、 UV ink shrinkage greatly affects adhesion
UV ink may experience significant shrinkage during the curing process, which can cause stress at the interface between the ink and the substrate, thereby reducing adhesion. Especially on porous materials such as non-woven fabrics, the shrinkage of ink has a more significant impact on adhesion.
Solution: Add a certain amount of monofunctional active diluent or a small amount of filler to the ink formula to reduce the shrinkage of the ink. In addition, UV ink adhesion promoter can be considered to enhance the physical adsorption force between the ink and non-woven fabric, thereby improving adhesion.
4、 Poor compatibility between ink and non-woven fabric materials
The compatibility between ink and substrate is also a key factor affecting adhesion. If the compatibility between UV flexographic ink and non-woven fabric materials is poor, it will directly affect the adhesion effect of the ink on the substrate.
Solution: Choose UV flexographic ink suitable for non-woven fabric printing, ensuring that the ink formula matches the properties of the non-woven fabric material. At the same time, sufficient testing should be conducted before printing to evaluate the compatibility between ink and non-woven fabric, in order to adjust the ink formula or printing process in a timely manner.
5、 Other factors
In addition to the above factors, some details during the printing process may also affect the adhesion of UV flexographic ink on non-woven fabrics. For example, insufficient printing pressure, inappropriate mesh roller wire angle, poor UV ink resistance of rubber rollers, etc.
Solution: Optimize printing process parameters, such as adjusting printing pressure, selecting appropriate mesh rollers and rubber rollers, etc. At the same time, strengthen the maintenance and management of printing equipment to ensure that it is in the best working condition.
The problem of poor adhesion of UV flexographic ink on non-woven fabrics is a complex issue involving multiple factors. By enhancing the corona treatment of non-woven fabrics, ensuring complete ink curing, adjusting ink formulations, selecting suitable inks and substrates, and optimizing printing processes, the adhesion of UV flexographic ink on non-woven fabrics can be effectively improved.
Huizhou StarColor Technology Co., Ltd. will continue to adhere to the business philosophy of "quality first, customer first, innovation driven, and green development", continuously increase research and development investment, expand product lines, improve service quality, and contribute to the development of the
UV flexographic ink industry. We firmly believe that through unremitting efforts and pursuit, StarColor will stand out in future market competition and become a shining star in the field of UV flexographic ink
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