Soybean ink has the advantages of printing quality and environmental protection. It has been applied to Zhang page type, rotary type, business form, elastic letterpress ink and so on. This study intends to test the viscosity, stability of splitting resistance, emulsification properties, particle size and other lithographic suitability of soy inks, and measure the concentration and gloss after the paper is developed, and then analyze and compare with traditional inks. To understand the difference in lithographic suitability between soybean inks and traditional inks.
I. Research motivation and background
The composition of a general lithographic ink includes a colorant, a medium, and some additives, wherein the medium is mainly a hard resin, a vegetable oil, and some non-vegetative ingredients. The vegetable oil in soybean ink is the composition of some soybean oil. The composition of soybean oil varies with the printing method. It is not the same as the composition of petroleum-based inks. Although soy ink contains the same pigments as petroleum-based inks, most Pigments are petrochemicals, however, soya bean inks can be partially decomposed and petroleum-based inks cannot be decomposed.
As for the production of soybean ink, it was from 1979 that the American Newspaper Publisher Association (ANPA) promoted the development of alternative petroleum-based printing inks, which coincided with the second oil crisis and the export of crude oil by OPEC. Indirectly affecting the supply of raw materials, in order to reduce the dependence on foreign crude oil imports and found that non-volatile and decomposable vegetable oils at the same time, can be used to produce vegetable inks instead of petroleum-based inks, can improve the rubbing resistance of newspapers. Plus volatile organic compounds in petroleum-based inks
(Volatile Organic Compounds, VOCs), which caused ecological damage. Later, after scholars tested more than 2,000 kinds of vegetable oil, it was considered that soy bean oil containing soybean oil was non-toxic and usable. So in 1987, the American Sunshine Chemical Company began to produce soy ink, and later introduced newspapers. use. Now, soya bean ink has even been promoted to all parts of the world. Later, there are soy labels that indicate soy oil-containing inks, and Taiwan is also being promoted in the printing industry (Wang Shouhong, 2004; PANoirot, 2004; E. Axmear, 2004; Patterson, 2003).
In the printability of soybean ink, it has the following characteristics:
(I) Ink emulsification is weak, and it can maintain its rheological and water tolerance in more than 50,000 printed presses.
(2) When the same amount of water is added, the response of soy ink to water is significantly sharper than that of mineral ink, the ink transfer is restored to be cleaner and faster, and soy bean ink has relatively low splitting resistance.
(C) In terms of ink viscosity, Boris Fuchs et al. (1991) showed that concentrated soybean ink has a relatively low viscosity, and PANoirot (2004) reported that the viscosity of soybean oil at 23Â°C is much greater than that of mineral oil.
Soybean ink has the following advantages in printing applications:
(A) Good rub resistance, so that the reader is not troubled by black hands.
(b) No irritating odor.
(3) The color of the ink is strong and bright, so that the printing industry can use less ink, save costs and increase printing units.
(D) can reduce the expansion of outlets.
(5) For environmental protection, the VOCs contained in soy inks are 17% of petroleum-based inks, which can be regarded as non-toxic inks (E. Axmear, 2004).
(6) It has good deinking properties and can be backfilled for recycling in black ink, which is environmentally friendly and cost-effective (B. Simpson, 1994).
As for the shortcomings, the price of soybean ink is higher than that of petroleum-based inks, which is a black ink used for newspaper printing, which is about 25% more expensive. Soybean inks dries more slowly than mineral inks (PANoirot, 2004). Soybean ink still faces some problems in the application of lithography, such as the surface of the printed product is easy to dry due to ink is not completed, resulting in the stained surface of the printed matter, and the difference between the hue and the final draft is large, the color gloss is poor, the picture performance level is insufficient No stereoscopic effect, etc., but also the problem of insufficient black ink concentration and poor balance between yellow ink and ink (Lu Lihua, 2004).
Based on the characteristics and problems of the above soy inks, this study intends to conduct experimental analysis on the printability of soybean inks in lithography, and compares the differences in printability between soybean inks and general lithographic inks, and on lithographic printing of soybean inks. Characteristics are discussed.
Second, the purpose of the study
In this study, a group of lithographic soybean ink inks of cyan, magenta, yellow, and black inks were tested with a set of general lithographic printing inks in four colors to investigate differences in the printability of soy inks and general inks, and to provide results. The printing industry serves as a reference.
The purpose of this study includes:
(1) Discuss the differences in lithographic suitability between soybean ink and traditional general inks, including the stability of the ink's splitting resistance, viscosity, emulsification rate, and particle size.
(b) Explore the differences in concentration, hue, and gloss of soy bean inks and conventional inks in paper color development.
(3) From the stability of the ink splitting resistance, calculate the regression curve equation for the stability of the splitting resistance of soy ink.
Third, the research process
The purpose of this study was to investigate the differences in lithographic suitability between soybean inks and general inks. Therefore, a group of soybean inks was used as the experimental group, and a group of general inks was used as the control group to compare and analyze the printability of soybean oil inks.
è´°, literature discussion
First, vegetable ink
The inks used in today's printing, in addition to traditional inks, have also developed many environmentally friendly inks. In order to meet the environmental requirements of the ink, we must first change the ink composition, that is, the use of environmentally friendly materials to formulate a new type of ink. The main environmental protection inks today are water-based inks, UV inks, and vegetable oil-based inks.
In the 1980s, the American Press and Publication Association (ANPA) developed a series of ink formulations that mix hard bitumen and tall oil fatty acids with carbon black pigments, but these inks are limited in price and availability of tall oil. The success, coupled with the difficulty of cleaning up the asphalt, has not been completely accepted by the industry. Later, in 1985, an improved version of ANPA developed a vehicle suitable for lithographic press printing, including alkaline soy oil, hydrocarbon resins, and pigments (Wang Shouhong, 2004; Noirot, 2004; Axmear, 2004; Patterson, 2003).
There are three basic types of vegetable oils in vegetable inks:
1. Drying oil: In the printing process, when the oil is in contact with oxygen, it changes from a liquid state to a solid state, where the oxygen controls the action of the catalyst. In the past, the users of the ink industry generally concentrated on dry oil. The medium in traditional inks usually contains linseed oil or other dry oils. It also contains some petroleum substances as solvents in the medium.
2. Semi-drying oils: Vegetable oils are generally replaced with semi-dry oils such as soybean oil, corn oil, rapeseed oil, and tall oil.
3. Non-drying oils: From the molecular structure of ink, vegetable oil molecules are very different from mineral oil molecules. Mineral oil molecules are three to five times smaller than vegetable oil molecules without considering branching. Due to differences in molecular structure, vegetable oils are much heavier than mineral oils, so vegetable oils can hardly be fixed and dried under heat (Noirot, 2004).
The viscosity of the oil used in traditional inks is 5 mPa.s at 23Â°C, 44mPa.s for linseed oil and 55mPa.s for soybean oil (Noirot, 2004). This difference affects the ink absorption on coated paper.
2. Stability of splitting resistance
In the same amount of water added, plant-based inks respond sharply to the addition of water, and the rapid recovery of transfer means that the water is limited and fast to absorb. In addition, the mineral ink shows a decline in the resistance to splitting and is unstable. Moisture absorption, if not properly managed, may result in over-emulsification.
Source: Graphic Arts
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