색지와 무늬지를 주로 생산하는 팬시지 공장의 경우 고객의 다양한 기호와 수요에 대응하기 위해서는 잦은 색상 및 지종교체가 필요하다. 기존 wet-end 시스템과 color control 시스템으로는 높아진 고객의 품질 욕구를 충족하기 어려울 뿐만 아니라 잦은 지종교체로 인한 생산성, 원가, 조업안정성 등의 손실을 수반한다. 이에 당사는 wet-end volume을 획기적으로 줄여 빠른 응답시간의 장점이 있는 POM 시스템(compact papermaking system) 과 on-line color control이 가능한 CLCC (closed loop color control) 시스템을 동시에 적용하여 각각의 장점을 활용한 지종 교체시간 단축과 색상의 균일성을 확보한 사례이다.

The accurate characterization of paper structure may provide critical information for ideal selection of raw materials and papermaking processes as well as for predicting the behavior and the quality of final paper products. In this study, local paper structure and the relationship among the structural parameters, thickness, grammage, apparent density and surface roughness of various handsheet and commercial paper samples were evaluated by using recently developed methods. A new concept of surface roughness was also introduced. The results demonstrate that there is significant overestimation in the measured thickness when using the conventional caliper method that originates from the surface roughness and poor paper formation. A novel non-contact thickness tester, referred to as the twin laser profilometer(TLP), provided results that were not subject to these artifacts and thus provided the local intrinsic thickness and consequently the local intrinsic apparent density.

A mathematical tension model for a moving web in a multi-span web handling system was derived and validated by using a simulator which includes unwinder, driven roller, winder, load cells, controllers, etc. A tension controller was designed to compensate tension disturbances generated by velocity changes of the unwinder and driven roller. From experimental results it was proved that the tension model properly expressed the tension behavior of a moving web for specific conditions. The distributed tension controller designed by using the pole-placement technique compensated the tension disturbances transfered from upsteram tension variation. Interactions between web spans including "tension transfer phenomenon" were clearly confirmed through the study. A mathematical model of lateral motion of a moving web was verified also by using the same experimental apparatus which includes displacement type guidance systems. And a feedforward control strategy was designed for more accurate control of the lateral motion of a moving web, which utilize a measured signal of the lateral displacement of web in a previous span and a more correctly identified mathematical model to estimate the disturbance of lateral motion from the previous span. This approach was turned out to be effective in improving the performance of the guidance system for more wide range disturbances.

Air entrainment of a winding roll with a nip roller was studied numerically. The amount of air entrainment between two rotating rollers was obtained by solving lubrication equation, Reynolds equation, which neglect the existence of a web. However, the numerical model of this study included the web existence, therefore it considered the two lubricating air films between a winding roll and a web and also between a nip roller and the web. The pressure profiles and gap profiles of the two films were obtained by solving lubrication equation for the two air films and force balance equation of the web. Ballooning phenomenon was examined in terms of nip force, wrap angle, web stiffness, web speed, and web tension. This ballooning phenomenon caused by the back flow of the air film blocked by the nip roller. Air entrainment of the two numerical models was compared.

제지산업은 용수 과소비 산업으로 환경보호의 중요성이 대두됨에 따라 폐수발생량 제한 및 신수사용에 많은 제한이 뒤따르게 된다. 당사(한솔파텍)는 공업단지가 아닌 일반 농경지대에 자리잡고 있기때문에 신수사용 및 폐수배출에 많은 제한을 받고있다. 본 발표문은 당사의 지난 1년동안의 용수절감 Project(In-Mill Closed화) 활동을 통해 용수절감 활동의 한모델을 제시한다.

Stability deterioration of AKD emulsion was studied with respect of the physical change of emulsion particles and the chemical change of AKD itself. Four kinds of commercial emulsions were kept at RT, 40, 50, and $60^{\circ}C$ water bath, respectively. Viscosity, particle size distribution, and solid contents of the emulsions were measured with storage time. At the same time, by performing NMR and IR spectroscopy analysis of the solvent-extracted AKD from the emulsions, the qualitative and quantitative information about the deformation of the AKD itself were obtained. AKD was gradually hydrolyzed to become dialkylketone and higher storage temperature accelerated destabilization of the AKD emulsions.

제지분야에서 중성 사이즈제로 광범위하게 사용되어지는 AKD emulsion의 사이징 효과의 발현속도가 낮은 단점을 보완하기 위하여, 기존 AKD emulsion에 추가 투입 사용함으로써 발현속도를 높여줄 수 있는 AKD 급속 반응형 정착제, 그리고 정착제를 사용하지 않는 초지 시스템에서도 급속 경화가 가능한 급속 반응형 AKD emulsion을 개발 하였다. AKD 급속 반응형 정착제의 투입량 및 종이 건조시간에 따른 사이징 효과를 상용화된 정착제와 비교하였으며 이 결과로부터 보다 빠른 사이징 효과발현을 확인하였다. 정착제를 사용하지 않는 시스템에서 급속반응형 AKD emulsion의 사이즈도 급속발현 효과를 확인하기 위하여 상용화된 emulsion과 사용량에 따른 사이징 효과와 건조시간에 따른 사이징효과를 비교함으로서 사이즈도의 급속 발현을 확인 할 수 있었다.

In this study, Life Cycle Assessment method has been carried out the Corrugated board box in considering environmental aspects by quantifying the environmental emission and assessing its environmental impact potential. The system boundary in this study is selected from cradle to gate stage(raw material acquisition, raw material production and product manufacturing) of the paper product. To evaluate the environmental impact potential, impact categories are divided into 8 categories. As a results, abiotic resource depletion of the impact categories has the largest contribution to the total impact potential as 31.02% of total, Next were continued ecotoxicity having a contribution of 27.17%. In the life cycle, environmental impacts from law material production stage were contributed largely as 80.78%.