Fountain solution composition for lithographic printing and heat-set offset rotary printing process

Abstract

The invention relates to a fountain solution composition for lithographic printing and heat-set offset rotary printing process. The inventive objective is to provide a method for improvement of blanket pilling, more particularly a method for improvement of blanket pilling in view of fountain solution composition. The objective is implemented by the following technical means: a fountain solution composition for lithographic printing is characterized by comprising at least one acyclic hydrocarbon diol compound having 6 to 8 carbon atoms in total and two OH groups, the two OH groups are respectively bind on the carbon atoms at 1- and 2- positions.

Description

technical field

[0001] The present invention relates to a lithographic fountain solution composition, and more particularly to a lithographic fountain solution composition preferably used in an offset printing process, especially a heat-set offset rotary printing process. Background technique

[0002] Lithographic printing is a printing method that cleverly utilizes the nature of immiscibility of water and oil. The printing layout is composed of areas that accept water and repel oily inks and areas that repel water and accept oily inks. The former is a non-image area, and the latter for the image area. The non-image area is wetted by the fountain solution, the chemical difference between the image area and the non-image area is enlarged, and the ink repellency of the non-image area and the ink acceptance of the image area are increased.

[0003] A lithographic printing machine is usually an offset printing method. Ink and fountain solution are supplied to the plate, and an ...

Examples

Embodiment 1 and 2 and comparative example 1～11

[0141]Except for changing the diol compound according to the following Table 1, use equal mass and exactly the same operation to prepare various fountain solution compositions according to the following formulas. In this formula, the unit is gram, and it is the addition amount in the case of adding water to adjust to 100 g at the end, and has the same meaning as mass %.

[0142] Formulation of fountain solution composition (use solution) when used

[0143] Ingredients Amount

[0144] Propylene glycol mono-n-butyl ether 0.5g

[0145] Propylene glycol 0.3g

[0146] Glycol compound 0.3g of table 1

[0147] Ammonium nitrate 0.05g

[0148] Citric acid 0.01g

[0149] Isothiazolin-3-one 0.002g

[0150] Benzotriazole 0.001g

[0151] Add water to reach 100g

[0152] For each fountain solution composition, a Lithron 26 printing machine manufactured by KOMORI Co., Ltd. was used, ink Super Leo Ecoo Black L of Toyo Ink Co., Ltd., micro-coated paper OK coat of Oji Paper Co., Ltd., a...

Embodiment 3～12

[0170] Except that the propylene glycol mono-n-butyl ether and propylene glycol in Example 2 were replaced with the compounds in Table 2 below, all experiments were performed in the same manner. In Example 12, isopropanol was used and its added amount was increased to 15 times (ie, 7.5%) that of the compound used in other examples (0.5%). In Example 12, unless the amount of isopropanol was increased in this way, even if the amount of water was increased, the ink tended to adhere to the non-image portion of the printed matter, and staining tended to occur. The results are shown in Table 2.

[0171] Table 2

[0172] Example

Compound 1

Compound 2

Blanket pile of ink

dot area

Reduction rate (%) Feed roller contamination

2 Propylene glycol mono-n-butyl ether Propylene Glycol 49 6 ○ 3 Ethylene glycol mono-n-butyl ether Propylene Glycol 52 8 ○ 4 Ethylene glycol mono-tert-butyl ether Propylene Glycol 52 8 ○ 5 Eth...

experiment example 1

[0176] The same printing experiment was carried out by only changing the addition amount of the diol compound in Example 2. As a result, it was found that the added amount is preferably 0.05% or more, more preferably 0.1% or more, particularly preferably 0.2% or more. In addition, when the added amount exceeds 1%, contamination of the water feed roller tends to worsen.

[0177] Furthermore, when the amount of 1,2-octanediol added was 70% and 1,2-hexanediol was added 30% in Example 2, the same effect was seen.

[0178] The results are shown in Table 3 below.

[0179] table 3

[0180] 1,2-octanediol content

[0181] * ○△=The intermediate level between ○ and △

technical field

[0001] The present invention relates to a lithographic fountain solution composition, and more particularly to a lithographic fountain solution composition preferably used in an offset printing process, especially a heat-set offset rotary printing process. Background technique

[0002] Lithographic printing is a printing method that cleverly utilizes the nature of immiscibility of water and oil. The printing layout is composed of areas that accept water and repel oily inks and areas that repel water and accept oily inks. The former is a non-image area, and the latter for the image area. The non-image area is wetted by the fountain solution, the chemical difference between the image area and the non-image area is enlarged, and the ink repellency of the non-image area and the ink acceptance of the image area are increased.

[0003] A lithographic printing machine is usually an offset printing method. Ink and fountain solution are supplied to the plate, and an ...

Examples

Embodiment 1 and 2 and comparative example 1～11

[0141]Except for changing the diol compound according to the following Table 1, use equal mass and exactly the same operation to prepare various fountain solution compositions according to the following formulas. In this formula, the unit is gram, and it is the addition amount in the case of adding water to adjust to 100 g at the end, and has the same meaning as mass %.

[0142] Formulation of fountain solution composition (use solution) when used

[0143] Ingredients Amount

[0144] Propylene glycol mono-n-butyl ether 0.5g

[0145] Propylene glycol 0.3g

[0146] Glycol compound 0.3g of table 1

[0147] Ammonium nitrate 0.05g

[0148] Citric acid 0.01g

[0149] Isothiazolin-3-one 0.002g

[0150] Benzotriazole 0.001g

[0151] Add water to reach 100g

[0152] For each fountain solution composition, a Lithron 26 printing machine manufactured by KOMORI Co., Ltd. was used, ink Super Leo Ecoo Black L of Toyo Ink Co., Ltd., micro-coated paper OK coat of Oji Paper Co., Ltd., a...

Embodiment 3～12

[0170] Except that the propylene glycol mono-n-butyl ether and propylene glycol in Example 2 were replaced with the compounds in Table 2 below, all experiments were performed in the same manner. In Example 12, isopropanol was used and its added amount was increased to 15 times (ie, 7.5%) that of the compound used in other examples (0.5%). In Example 12, unless the amount of isopropanol was increased in this way, even if the amount of water was increased, the ink tended to adhere to the non-image portion of the printed matter, and staining tended to occur. The results are shown in Table 2.

[0171] Table 2

[0172] Example

Compound 1

Compound 2

Blanket pile of ink

dot area

Reduction rate (%) Feed roller contamination

2 Propylene glycol mono-n-butyl ether Propylene Glycol 49 6 ○ 3 Ethylene glycol mono-n-butyl ether Propylene Glycol 52 8 ○ 4 Ethylene glycol mono-tert-butyl ether Propylene Glycol 52 8 ○ 5 Eth...

experiment example 1

[0176] The same printing experiment was carried out by only changing the addition amount of the diol compound in Example 2. As a result, it was found that the added amount is preferably 0.05% or more, more preferably 0.1% or more, particularly preferably 0.2% or more. In addition, when the added amount exceeds 1%, contamination of the water feed roller tends to worsen.

[0177] Furthermore, when the amount of 1,2-octanediol added was 70% and 1,2-hexanediol was added 30% in Example 2, the same effect was seen.

[0178] The results are shown in Table 3 below.

[0179] table 3

[0180] 1,2-octanediol content

[0181] * ○△=The intermediate level between ○ and △

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