Ink scraping is not clean troubled many manufacturers, there are ten reasons for scraping is not clean, save it for use!

1.Ink viscosity is too high

When the viscosity of the ink increases, the surface tension also increases correspondingly, and the force between them also increases, so that the scraper will increase the impact force of the ink on the scraper in the contact process with the ink, destroy the balance point, resulting in the scraper can not completely scrape the remaining part of the ink on the plate roller, which directly affects the quality of the product.

2.The pressure of the scraper is too small

Under normal circumstances, when the machine is just started, the pressure of the scraper is often set very small, with the increase of the machine speed, the impact of the printing ink on the plate roller on the scraper will increase with the increase of the machine speed, destroying the original balance point, directly resulting in unclean scraping.

3.Ink into the water or use time is too long

After the ink is used for a long time, on the one hand, the pigment in the ink will be precipitated continuously during the long cycle process, so that the composition of the ink will change, on the other hand, the water vapor in the air will be solidified due to the volatilization of the solvent and enter the ink, and the composition of the ink will also change. Thus, the overall performance of the ink is changed, the scraping performance of the ink is greatly reduced, and the scraping difficulty of the scraper is directly increased, resulting in unclean scraping.

4.The solvent dries too fast or slowly

Mixing solvent too fast dry, in addition to the ink viscosity in a short time to improve, but also make the ink adhere to the spare part of the plate roller, due to the solvent volatilization too fast, adhere to the plate roller ink will be gelatinized, in the plate roller through the scraper, due to the high adhesive force of the gelatinized ink, the scraper can not be in the plate roller running for a week to scrape it off, thus directly to the printing substrate. Resulting in unclean scraping.

The solvent itself is volatilized very slowly, causing the remaining part of the ink over the plate roller to not dry on the surface of the plate roller in time, and its state is similar to that of the dot part of the ink, so that when the printing substrate passes through the plate roller, the remaining part of the ink over the plate roller can be easily transferred to the printing substrate, resulting in the generation of dirty scraping.

5.The use of roller is too long

Due to long-term use, the surface of the plate roller will be worn due to the force of the scraper, and the surface will become more and more smooth, resulting in the affinity between the ink and the plate roller becoming stronger and stronger, directly increasing the difficulty of scraping the scraper, resulting in unclean scraping.

6.The scraper assembly is too soft, the Angle is too peaceful

The scraper assembly is too soft, the Angle is too normal, due to the effect of air pressure, the scraper will be bent on the surface of the plate roll, that is, the scraping point, resulting in the scraping mode is not a "point" relationship, but a "surface" relationship, which can not effectively scrape the remaining part of the plate roll, that is, the dot part of the ink, resulting in unclean scraping.

7. Plate roller assembly different heart

Plate roller assembly of different heart phenomenon, under normal circumstances, the beating within 10 wires will not affect the color and product quality. When the plate roll runs from the side with a longer oval diameter to the side with a shorter oval diameter, the distance becomes longer. Because the scraper is an external force acting on the plate roll, there is a time difference in the conversion process, forming a period of time, that is, the pressure of the scraper is relatively reduced in an instant, so that the pressure of the scraper is tight and loose in a plate week due to the beating of the plate roll. As a result, there is a local scraping phenomenon.

7.Solvent problem

Since the solvent is added to the ink, the solvent water will directly destroy the overall performance of the ink, resulting in unclean scraping. Improper solvent ratio will directly cause the ink to dry fast or slow, resulting in unclean scraping.

The solvent itself has impurities, such as low purity and high water content.

9.Ink does not cycle

On the one hand, the non-circulating ink will make the viscosity difficult to control, on the other hand, due to the thixotropic characteristics of the ink, the performance of the ink will be reduced in the non-circulating ink, and because the non-circulating ink will cause the surface of the ink in the ink tank, directly increase the chance of the dry ink sticking to the plate roller, resulting in unclean scraping.

10.Ihe ink stick problem

Because the raised part of the ink stick surface adheres to some ink more or less after use, with the increase of the number of uses, the amount of ink also increases, and when the solvent is volatilized completely, the dry ink is left. In the following use process, because the ink in the ink tank can not completely wet the dry ink on the raised part of the surface of the ink mixing stick, resulting in the gel strong ink transferred to the surface of the ink mixing stick during the operation of the plate roll, due to the strong adhesion, the scraper can not be scraped off the plate roll when the plate roll runs for a week, so as to directly bring it to the printing substrate. Resulting in the generation of unclean scraping, this phenomenon is especially obvious in the non-dot part.

Anhui Sinograce Chemical Co., Ltd.(Sinograce Chemical) is mainly engaged in the business of chemical products,such as printing ink.Sinograce Chemical is mainly engaged in the business of screen printing ink and other product series.Good materials, advanced production technology, and fine manufacturing techniques are used in the production of chemical liquids. It is of fine workmanship and good quality and is well sold in the domestic market.