• Textile Coloration and Finishing
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• v.20 no.2
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• pp.66-74
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• 2008

Effect of disperse dyeing on flame retardant finishing of PET fabrics via UV curing using three UV curable phosphorous-containing methacrylates and ammonium polyphosphate(APP) was investigated. The dye fixation and flame retardancy of PET fabrics did not change significantly with excellent durability to five laundering cycles irrespective of the dyeing and finishing sequence. However, the flame retardancy of Pekoflam-treated fabrics was lower than that of the UV treated and decreased substantially when heat treatment was carried out before the dyeing. The dyeability of the flame-retardant PET fabrics was not affected in the case of UV curing of the methacrylates alone. However, UV finishing after the dyeing caused significant decrease in K/S and ${\Delta}E$ due to changed refraction and inherent color of surface coating of the UV curable monomers and APP. Whereas the heat treatment with Pekoflam decreased both color fastness to laundering and sublimation, surprisingly the UV finish of PET fabrics before and after the dyeing increased the color fastness probably resulting from the presence of photopolymerized surface layer on the fabrics.

• Journal of the Korean Society for Precision Engineering
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• v.32 no.9
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• pp.781-786
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• 2015

Recently, studies of 3D printing methods have been working in various applications. For example, the powder base method laminates the prints by using a binding or laser sintering method. However, the draw back of this method is that the post process is time consuming and does not allow for parts to be rapidly manufactured. The binding method requires the post process while the time required for the post process is longer than the manufacturing time. This paper proposes a UV curing binding method with an integrated piezo printing head system. The optimization of an arbitrary waveform generation for the control of a UV curable resin droplet was researched, in addition to developed optimized UV curing processes in multi nozzle ink jet heads.

• Polymer(Korea)
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• v.35 no.2
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• pp.141-145
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• 2011

The electron beam (EB) induced curing of a typical resin designed for the hard coating layer of in-mold decoration foils was investigated. The samples were irradiated with different doses of EB and the curing reaction was monitored by Fourier transform infrared (FTIR) spectroscopy. The change in coating properties such as surface hardness and anti-abrasion property was studied as a function of increasing dose. The effect of the addition of nano-particles on the improvement of coating properties was also examined. It was expected that the experimental results could be used for the commercial exploitation of the EB curing system comparable to the ultraviolet (UV) curing system.

• Journal of the Korean Graphic Arts Communication Society
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• v.18 no.1
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• pp.13-24
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• 2000

UV-curable resin has the properties of quick-drying, high productivity at low temperature, energy, space saving, solventless, non-polluting and low-stinking, and thus, UV-curing system has been widely used in the fields of printing inks, adhesives, paints and coating agents. This study has been executed to develop a new functionnal material by the polymerization induced phase separation. The results obtained were as follows. As for the curing properties of the monomer/prepolymer/alkyd resin blends, it was found out that there was a peak by the polymerization induced phase separation when measuring the changes of viscosity and elasticity. It was also found out that such polymerization phase separation occurred in case that the alkyd resin contents were 20wt% and 30wt% and not found at the contents of 40wt%. Therefore, it would be desirable to maintain the contents of alkyd resin at less than 30wt% in order to use the polymerization induced phase separation.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2011.06a
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• pp.1115-1116
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• 2011

• Journal of the Korean Graphic Arts Communication Society
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• v.16 no.3
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• pp.29-41
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• 1998

The ultraviolet(UV)-curable materials wildly have been used as a ink and coating materials. A according to measure UV polymerization phase separation of acryl groups 2,3,4-functional monomer, a few experiments were performed gel fraction, dynamic viscosity of alkyd resin blend system. Dependence of photoiniator concentration and various monomer, alkyd resin content investigated structural changes of films cured by UV irradiation. Curing rate measured UV irradiation under $25^{\circ}C$, cell gap 7cm and film thickness 100${\mu}{\textrm}{m}$. In results, it was through that the viscoelastic properties of films cured with increasing the ratios of monomer/alkydresin contents are network polymer in properties such as viscoelasticity.

• Journal of the Korean Graphic Arts Communication Society
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• v.11 no.1
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• pp.57-69
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• 1993

Currently, Computer-To-Plate printing system comes into wide use, an accurate color simulation system is demanded. This paper is described some basic operational expressions known in the simulation of colors by use of halftone dots, and is proposed improved color prediction of multicolor halftone, The experimental results show that proposed color predict Eq. is useful and valid in predicting the color reproduction of multicolor halftone.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2003.06a
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• pp.1220-1223
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• 2003

The UV nanoimprint technology uses the UV light as the energy source. Because the imprint process is carried out in room temperature and low pressure, this technology has its own merits compared to the thermal nanoimprint. However, in UV nanoimprint technology, a resin which has low viscosity is essential for the improvement of accuracy. In this research, a resin (named as IMS01) which has relatively low viscosity was developed. And a measurement system was developed in order to measure the degree of cure of the resin. The measurement system which is composed of FT-IR, UV light source and optical guide can measure the degree of cure in real time. From the experimental results, it was found that the IMS01 is cured more rapidly than existing resin (PAK01).

• Journal of the Korean Graphic Arts Communication Society
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• v.19 no.2
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• pp.68-78
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• 2001

UV-curable resin has the properties of quick-drying, thigh productivity at low temperature, energy savint, space saving, solventless, non-polluting and low-stinking, and thus, UV-curing system has been widely used in the fields of printing inks, adhesives, paints and coating agents. This study has been executed to micro-patterning used UV-curable resin, The micro-patterning properties of this photoresist were investigated under irradiation of UV light low pressure mercury lamp. When the exposed photoresist film was developed by pure water developer, the resolution of this photoresist was about 50$\mu\textrm{m}$.

• Journal of Adhesion and Interface
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• v.11 no.2
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• pp.41-49
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• 2010

Furan-containing epoxide monomers (8, 9) were designed and synthesized as carbon-neutral, environment-friendly adhesion material. Bicyclic skeleton were constructed using the Diels-Alder reaction of furan and methyl acrylate, both readily accessible starting material from a biomass via bio-refinery process. After reduction of ester functionality, resulting hydroxyl moieties were coupled to epichlorohydrin to provide the epoxy-functionalized furanic monomers (8, 9). The structure of new furanic monomers was confirmed by $^1H$ and $^{13}C$ NMR spectroscopy. As UV-curable monomers, basic properties such as UV curing time and the extent of UV curing were evaluated by photo DSC. Photo-curing shrinkages were measured by linear variable differential transformer transducer (LVDT) and the effect of molecular structure on shrinkage was considered. In addition, new synthetic compounds showed the shear strength over 3 MPa when they were photo-cured between polycarbonate plates, which indicates these compounds are feasible to use as photo-curable adhesive materials.