In the course of using the ink, it is often necessary to adjust the printing properties of the ink according to the characteristics of the print, the working environment, the production process, etc., so that the printing worker needs to understand the use performance of the ink adjuvant.
First, the viscous and fluidity modifiers are many in nature, the role of which is with the flowability and viscosity of the ink, mainly including the ink and the detackifier. The traditional varnish is mainly composed of zero oil (ie, external oil) and six oils of six varieties. The viscosity is the largest in the zero oil, and then decreases to the sixth oil, but some are not commonly used. Of course, there are other varieties of varnish.
The main introduction is as follows:
1, No. 6 oil It is one of the traditional commonly used ink additives, mainly used to increase the flow of ink, but also can reduce the viscosity of the ink, the deployment of resin ink is generally less than 5%. After adding it will reduce the ink dryness and gloss.
2, zero transfer oil (also known as outside the oil)
The one with the highest viscosity in the varnish, with almost no fluidity, is a transparent elastic fluid with a relatively high viscosity. Mainly used to increase the viscosity of the ink, reduce the degree of emulsification, adjust the viscosity of the ink before and after the color group, so that the viscosity of the printing ink is slightly larger, and the transferability of the ink is improved. The amount is generally less than 5% so as not to affect the dryness.
3, resin varnish viscosity is greater than the 6th oil, used to adjust the ink's fluidity, but does not affect the viscosity of the ink, the amount is generally about 3%. The addition of the varnish does not affect the gloss and adhesion fastness of the ink, and has little effect on the dryness.
4, diluent viscosity is smaller than the No. 6 oil, can increase the ink's fluidity, and reduce the viscosity, with less use but the effect is obvious. Dosage - generally less than 3%, after adding basically does not affect the gloss and dryness of the ink.
5, high boiling point kerosene (aviation kerosene)
Its boiling point is 250～290°C, it is an excellent ink adjuvant and it has good miscibility with ink. It can be used directly in ink to reduce the viscosity of ink and increase the fluidity to a certain extent. The effect is obvious. The amount is generally 1% to 2% to meet the requirements, of course, can also be increased or decreased as appropriate. After adding, it will not affect the gloss and adhesion of the ink, and has little effect on the drying property.
6, withdrawal agent (also known as detackifier)
It is a paste-like body and it is also one of the traditional commonly used ink adjuvants. It has the effect of lowering the viscosity of the ink but does not substantially increase the flowability. It can be used with resin varnish, No. 6 oil, etc., and can also be used alone. The amount is generally less than 5%, too much can easily lead to dirty version and reduce the ink gloss, dryness and adhesion. Need to cover the film should more strictly control the amount of use, otherwise it will cause film lamination and poor adhesion and other ills.
7, ink improver (also known as ink additives)
Paste is a new type of ink adjuvant. With the ink has a very good miscibility, adding ink does not dilute the ink. Both can reduce the viscosity of the ink, but also increase the fluidity, the amount is usually between 3% to 8%, but also increase or decrease, as appropriate. Under normal circumstances will not affect the ink drying, but the excess will reduce the ink's gloss and adhesion.
Second, driers are used to adjust the dryness of the ink. There are two main types:
1. White dry oil is a mixed desiccant, which can promote the inner layer and the surface of the ink to be dry at the same time. It can be used alone or in combination with red dry oil. Strong drying performance, and can improve the gloss of the print to some extent. The amount is preferably less than 5%, up to no more than 10%. Adding too much will appear evil, dirty version, dry rubber roller and other ills, in case of such failures may be appropriate to reduce the amount of white dry oil (3% or less), and add a small amount of red dry oil (about 0.5%) to solve. It needs to be noticed that white dry oil contains heavy metal lead which is harmful to the human body. Therefore, it cannot be used in printed food packaging and other sanitary articles. In case of such prints, red dry oil or mixed desiccant can be used.
2, red dry oil has a small amount, the effect is obvious, can make the surface of the ink quickly dry conjunctiva characteristics, and can improve the gloss of the print. Usually used in conjunction with white dry oil, and sometimes can also be used alone, the amount is generally about 1%, excessive easy to produce "dry roller" phenomenon. In the "dry overprint" (ie, wet-press dry printing), the first two colors cannot be used or used as little as possible to avoid crystallization of the ink layer. In addition, red dry oil, although dark red or purple, but because it is transparent and the amount is very small, it will not generally affect the color tone of the ink, even yellow, white and other light-colored ink can usually be used.
3, mixed desiccant In addition to the above two kinds of desiccant in addition to a new type of advanced driers, ink manufacturers recently developed products, are mixed desiccant. With the characteristics of promoting the ink to be fully and rapidly dried by the surface and the inside, the glossiness of the printing and the fastness of the ink can be improved to some extent. Because it does not contain heavy metals that are harmful to the human body, it can be used as an alternative to white dry oil for printing food packaging and other sanitary requirements. Generally used alone to meet the requirements, if there is no health requirements on the print can also be used with dry white oil. When used alone, the amount is generally controlled below 2%. In addition, the mixed desiccant itself is dark red or purple red, but because it is transparent and its amount is small, it generally does not affect the hue of the ink like red dry oil.
Third, dilute agent (dilute ink)
The auxiliary agent for formulating light-color ink mainly includes white ink, light diffusing agent and the like.
1. White ink is a kind of diluting agent commonly used in the preparation of light-colored inks. The light-colored inks formulated with it have a good hiding power, and the ink is thick and white and has a strong powdery texture, which has the effect that other diluting agents cannot match. However, due to the fact that the white ink pigment has a large specific gravity and coarse particles, the printability is not very satisfactory. In some cases, problems such as ink transmission and poor transfer are easily caused, and the adhesion of the ink is also relatively low. Prints that require lamination sometimes suffer from poor adhesion. To avoid such failures, brighter paste or lighter may be used instead. For prints that must use white ink as a diluting agent, it is recommended to choose a white ink with good quality, or a combination of both white ink and bright-light paste. This will not only maintain the unique quality of white ink, but also improve the printability of ink and improve the The gloss and adhesion of the print.
2, withdrawal agent (also known as dilute agent)
It is a transparent diluting agent and has good miscibility with the ink. Adding ink only plays the role of diluting the color without affecting the original ink color tone. The lower grade dipgents have somewhat poorer dryness and gloss, and desiccants must be added as appropriate. The higher-grade lighter has the characteristics of high gloss, good printability, and moderate dryness, and usually does not require the use of a desiccant. Generally used alone, can also be used with white ink.
3, bright light is an excellent ink dilute agent, in addition to the same advantages with the lighter, but also has a higher transparency and gloss, better printability and drying characteristics. In addition to use as a dilute agent, it can sometimes be used as a gloss coating surface, has a good gloss, but the friction resistance is not high.
Fourth, offset printing oil is a printing type bright oil, can use the printing machine directly on the surface of the coating. It has excellent transparency, gloss and rub resistance, water resistance and solvent resistance. It is mainly used for polishing the surface of the prints, and it can also be used as a diluting agent. Dilute inks have higher gloss and rub resistance and have good printability. However, light oil will reduce the life of the ink roller and blanket, so it should be avoided as a diluting agent, and the use of bright light as well.
Offset bright oil is divided into light type and matte type, and should be distinguished when used.
The above is only a part commonly used in the ink adjuvant, in addition to anti-drying agent, anti-sticking agent, anti-friction agent, etc., which will not be described here.
First, the viscous and fluidity modifiers are many in nature, the role of which is with the flowability and viscosity of the ink, mainly including the ink and the detackifier. The traditional varnish is mainly composed of zero oil (ie, external oil) and six oils of six varieties. The viscosity is the largest in the zero oil, and then decreases to the sixth oil, but some are not commonly used. Of course, there are other varieties of varnish.
The main introduction is as follows:
1, No. 6 oil It is one of the traditional commonly used ink additives, mainly used to increase the flow of ink, but also can reduce the viscosity of the ink, the deployment of resin ink is generally less than 5%. After adding it will reduce the ink dryness and gloss.
2, zero transfer oil (also known as outside the oil)
The one with the highest viscosity in the varnish, with almost no fluidity, is a transparent elastic fluid with a relatively high viscosity. Mainly used to increase the viscosity of the ink, reduce the degree of emulsification, adjust the viscosity of the ink before and after the color group, so that the viscosity of the printing ink is slightly larger, and the transferability of the ink is improved. The amount is generally less than 5% so as not to affect the dryness.
3, resin varnish viscosity is greater than the 6th oil, used to adjust the ink's fluidity, but does not affect the viscosity of the ink, the amount is generally about 3%. The addition of the varnish does not affect the gloss and adhesion fastness of the ink, and has little effect on the dryness.
4, diluent viscosity is smaller than the No. 6 oil, can increase the ink's fluidity, and reduce the viscosity, with less use but the effect is obvious. Dosage - generally less than 3%, after adding basically does not affect the gloss and dryness of the ink.
5, high boiling point kerosene (aviation kerosene)
Its boiling point is 250～290°C, it is an excellent ink adjuvant and it has good miscibility with ink. It can be used directly in ink to reduce the viscosity of ink and increase the fluidity to a certain extent. The effect is obvious. The amount is generally 1% to 2% to meet the requirements, of course, can also be increased or decreased as appropriate. After adding, it will not affect the gloss and adhesion of the ink, and has little effect on the drying property.
6, withdrawal agent (also known as detackifier)
It is a paste-like body and it is also one of the traditional commonly used ink adjuvants. It has the effect of lowering the viscosity of the ink but does not substantially increase the flowability. It can be used with resin varnish, No. 6 oil, etc., and can also be used alone. The amount is generally less than 5%, too much can easily lead to dirty version and reduce the ink gloss, dryness and adhesion. Need to cover the film should more strictly control the amount of use, otherwise it will cause film lamination and poor adhesion and other ills.
7, ink improver (also known as ink additives)
Paste is a new type of ink adjuvant. With the ink has a very good miscibility, adding ink does not dilute the ink. Both can reduce the viscosity of the ink, but also increase the fluidity, the amount is usually between 3% to 8%, but also increase or decrease, as appropriate. Under normal circumstances will not affect the ink drying, but the excess will reduce the ink's gloss and adhesion.
Second, driers are used to adjust the dryness of the ink. There are two main types:
1. White dry oil is a mixed desiccant, which can promote the inner layer and the surface of the ink to be dry at the same time. It can be used alone or in combination with red dry oil. Strong drying performance, and can improve the gloss of the print to some extent. The amount is preferably less than 5%, up to no more than 10%. Adding too much will appear evil, dirty version, dry rubber roller and other ills, in case of such failures may be appropriate to reduce the amount of white dry oil (3% or less), and add a small amount of red dry oil (about 0.5%) to solve. It needs to be noticed that white dry oil contains heavy metal lead which is harmful to the human body. Therefore, it cannot be used in printed food packaging and other sanitary articles. In case of such prints, red dry oil or mixed desiccant can be used.
2, red dry oil has a small amount, the effect is obvious, can make the surface of the ink quickly dry conjunctiva characteristics, and can improve the gloss of the print. Usually used in conjunction with white dry oil, and sometimes can also be used alone, the amount is generally about 1%, excessive easy to produce "dry roller" phenomenon. In the "dry overprint" (ie, wet-press dry printing), the first two colors cannot be used or used as little as possible to avoid crystallization of the ink layer. In addition, red dry oil, although dark red or purple, but because it is transparent and the amount is very small, it will not generally affect the color tone of the ink, even yellow, white and other light-colored ink can usually be used.
3, mixed desiccant In addition to the above two kinds of desiccant in addition to a new type of advanced driers, ink manufacturers recently developed products, are mixed desiccant. With the characteristics of promoting the ink to be fully and rapidly dried by the surface and the inside, the glossiness of the printing and the fastness of the ink can be improved to some extent. Because it does not contain heavy metals that are harmful to the human body, it can be used as an alternative to white dry oil for printing food packaging and other sanitary requirements. Generally used alone to meet the requirements, if there is no health requirements on the print can also be used with dry white oil. When used alone, the amount is generally controlled below 2%. In addition, the mixed desiccant itself is dark red or purple red, but because it is transparent and its amount is small, it generally does not affect the hue of the ink like red dry oil.
Third, dilute agent (dilute ink)
The auxiliary agent for formulating light-color ink mainly includes white ink, light diffusing agent and the like.
1. White ink is a kind of diluting agent commonly used in the preparation of light-colored inks. The light-colored inks formulated with it have a good hiding power, and the ink is thick and white and has a strong powdery texture, which has the effect that other diluting agents cannot match. However, due to the fact that the white ink pigment has a large specific gravity and coarse particles, the printability is not very satisfactory. In some cases, problems such as ink transmission and poor transfer are easily caused, and the adhesion of the ink is also relatively low. Prints that require lamination sometimes suffer from poor adhesion. To avoid such failures, brighter paste or lighter may be used instead. For prints that must use white ink as a diluting agent, it is recommended to choose a white ink with good quality, or a combination of both white ink and bright-light paste. This will not only maintain the unique quality of white ink, but also improve the printability of ink and improve the The gloss and adhesion of the print.
2, withdrawal agent (also known as dilute agent)
It is a transparent diluting agent and has good miscibility with the ink. Adding ink only plays the role of diluting the color without affecting the original ink color tone. The lower grade dipgents have somewhat poorer dryness and gloss, and desiccants must be added as appropriate. The higher-grade lighter has the characteristics of high gloss, good printability, and moderate dryness, and usually does not require the use of a desiccant. Generally used alone, can also be used with white ink.
3, bright light is an excellent ink dilute agent, in addition to the same advantages with the lighter, but also has a higher transparency and gloss, better printability and drying characteristics. In addition to use as a dilute agent, it can sometimes be used as a gloss coating surface, has a good gloss, but the friction resistance is not high.
Fourth, offset printing oil is a printing type bright oil, can use the printing machine directly on the surface of the coating. It has excellent transparency, gloss and rub resistance, water resistance and solvent resistance. It is mainly used for polishing the surface of the prints, and it can also be used as a diluting agent. Dilute inks have higher gloss and rub resistance and have good printability. However, light oil will reduce the life of the ink roller and blanket, so it should be avoided as a diluting agent, and the use of bright light as well.
Offset bright oil is divided into light type and matte type, and should be distinguished when used.
The above is only a part commonly used in the ink adjuvant, in addition to anti-drying agent, anti-sticking agent, anti-friction agent, etc., which will not be described here.
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