• 한국인쇄학회지
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• 제23권2호
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• pp.1-14
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• 2005

Generally, printing inks are composed of pigment, vehicle and additive. Among others, the vehicle transfers the pigment to substrate and then binds it on the surface. So, rheological properties of the vehicle are an important factor which has influence on printability. Thus, in this study, rheology of the vehicle was investigated by using rotational rheometer according to molecular weight of resin. Also, emlusion rheology of water in oil type and its microstructure were examined with increasing the shear rate. Consequently, the following results were obtained: (1) By viscometric flow test, zero shear viscosity and shear thinning index of vehicle increased with increasing the molecular weight of resin. (2) By relaxation and creep test, relaxation time and retardation time of vehicle increased with increasing the molecular weight of resin. (3) By frequency sweep test, crossover point of vehicle increased with increasing the molecular weight of resin. (4) G' and G" of emlusions increased with increasing the molecular weight by amplitude sweep test. (5) The shape of water drop in emlusions was changed to the capillary tube.

• Korea-Australia Rheology Journal
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• 제15권1호
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• pp.27-33
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• 2003

Associating polymers are hydrophilic long-chain molecules to which a small amount of hydrophobic groups (hydrophobes) is incorporated. In aqueous solution, the association interactions result in the formation of three-dimensional network through flowerlike micelles at high concentrations. In colloidal suspensions, the associating polymers act as flocculated by bridging mechanism. The rheological properties of suspensions flocculated by associating polymers end-capped with hydrophobes are studied in relation to the bridging conformation. At low polymer concentrations, the polymer chains effectively form bridges between particles by multichain association. The suspensions are highly flocculated and show typical viscoelastic responses. When the polymer concentration is increased above the absorbance at saturation, the excess polymer chains remaining in the solution phase build up three-dimensional network by associating interactions. Since the presence of particles does not significantly influence the network structures in the medium, the relative viscosity, which gives a measure of the degree of flocculation is decreased with increasing polymer concentration. The bridging conformation and flocculation level vary strongly depending on the polymer concentrations.

• 한국인쇄학회지
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• 제21권2호
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• pp.1-10
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• 2003

The Rheological properties are important factors in printing process. Specially, emulsification phenomenon is a very important factor that decides the quality of printing products in lithography. In this paper, I investigated the flow characteristics depending on calcium carbonate concentration for emulsified inks. By applying the data of this paper, I which to predict quality of printing product in practical printing process.

• 한국축산식품학회지
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• 제44권2호
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• pp.225-238
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• 2024

3D printing technology enables the production of creative and personalized food products that meet consumer needs, such as an attractive visual appearance, fortification of specific nutrients, and modified textures. To popularize and diversify 3D-printed foods, an evaluation of the printing feasibility of various food pastes, including materials that cannot be printed natively, is necessary. Most animal resources, such as meat, milk, and eggs, are not inherently printable; therefore, the rheological properties governing printability should be improved through pre-/post-processing or adding appropriate additives. This review provides the latest progress in extrusion-based 3D printing of animal resource-based inks. In addition, this review discusses the effects of ink composition, printing conditions, and post-processing on the printing performance and characteristics of printed constructs. Further research is required to enhance the sensory quality and nutritional and textural properties of animal resource-based printed foods.

• Korean Chemical Engineering Research
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• 제48권3호
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• pp.397-400
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• 2010

스크린 프린팅에서의 계면유체역학적인 문제를 알루미나 나노입자를 물에 분산시킨 점성과 탄성을 갖는 모델잉크를 대상으로 실험적으로 연구하였다. 형상이 다른 스크린 패턴을 통과한 잉크를 젖음성이 다른 고체면에 인쇄될 때 인쇄형상에 대하여 연구한 결과 고체면에의 인쇄 형상은 단순히 스크린 패턴이나 평형상태의 접촉각에 의하여만 결정되지 않음을 알 수 있었다. 또한 오목한 모서리와 볼록한 모서리의 차이는 점도에 따라 달라짐을 볼 수 있었다. 특히 잉크의 탄성이 테두리의 형태에 영향을 미치는 것을 알 수 있었다.

• 펄프종이기술
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• 제47권5호
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• pp.141-146
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• 2015

This study was carried out to elucidate the partial substitutability of SB latex with environmental-friendly coating binders for coated paper. Starch-based biobinder, ethylene vinyl acetate and acryl-based binder were evaluated for this purpose. Several combinations of above binders were applied to top layer coating, and properties of coating colors and printability were evaluated. When 20% and 30% of SB latex were substituted by acryl-based synthetic binder, ethylene vinyl acetate and biobinder, the brightness, whiteness and opacity of coated paper were similar to those obtained from SB latex. Ink set and stiffness of coated paper manufactured through 20% and 30% substitution of SB latex by biobinder and EVAc were improved, but dry- and wet-pick strength were decreased. The research works on the improvement of dry- and we-pick strength, mechanical stability and rheological properties at high shear condition should be continued for the commercial application of biobinder, EVAc and acryl-based binder.