fille의 효과 및 미세섬유의 보류를 콘트롤하는 것은 새로운 지종을 개발하는데 있어서 매우 중요한 것이다. 또한 기계적 성능을 최대화 하고 최종 소비자의 가 원하는 종이의 구조를 갖도록 하는데 있어서도 매우 중요한 것이다. 특히 고속 고전단력을 갖고 있는 설비에서 fille 을 많이 사용하면서 종이 및 판지를 생산하는데 있어 원하는 보류 및 지합을 구현하는 것은 매우 어렵다. 양이온 및 음이온 마이크로 폴리머(MP)의 새로운 기술이 개발되었다. 이번에 개발된 수용성 화학 물질은 휘발성유기물질(VOC) 및 알킬페놀에독실레이트(APE)가 없다. 그러한 MP 를 선형구조의 폴리아크릴아마이드와 함께 적용하거나, 무기 마이크로파티클(벤토나이트, 실리카 혹은 유사한 광물질)과 함께 사용하면 탈수, 섬유보류 그리고 회분보류에 있어서 아주 뛰어난 효과가 나타났다. 그러한 효과는 백상지 및 SC 종이등 고충전 종이에서뿐만 아니라 회분량이 적은 신문지 생산에서도 확인되었다. 특히 미표백 포장용지 생산시 폴리아크릴아마이드와 함께 양이온성 MP를 사용하면 탈수효과가 뛰어나게 개선됨을 볼 수 있었다.

Cost efficiency is today the primary requirement in the paper and board industry. This has led therefore, to a greater preponderance of products with specifically designed functionality to take account of current industry needs. Continually increasing machine coating speeds together with these new coating colour components have put more emphasis on the importance of the correct rheology and water retention of the coating colours to achieve good runnability and end product quality. In the coating process, some penetration of the aqueous phase, to the base paper or board must occur to anchor the pre-coating to the base or the topcoat to the pre-coat. The aqueous phase acts as a vehicle not only for the binder, but also for the other components. If this water or material penetration is not controlled, there will be excessive material shift from the coating colour to the base, before immobilization of the coating colour will stop this migration. This can result in poor machine runnability, unstable system and uneven coating layer, impacting print quality. The performance of rheology modifiers or thickeners on the coating color have tended to be evaluated by the term, "water retention". This simple term is not sufficient to explain their performance changes during coating. In this paper we are introducing a new concept of "material retention", which takes note of the total composition of the coating colour material and therefore goes beyond the concept of only water retention. Controlled material retention leads to a more uniform z-directional distribution of coating colour components. The changes that can be made to z-directional uniformity will have positive effects on print quality as measured by surface strength, ink setting properties, print gloss, mottling tendency. Optical properties, such as light scattering, whiteness and light fastness delivery should also be improved. Additionally, controlled material retention minimizes changes to the coating colour with time in re-circulation giving less fluctuation in quality in the machine direction since it more closely resembles fresh coating for longer periods. Use of the material retention concept enables paper and board producers to have more stable runnability (i.e. lower process costs), improved end product quality (i.e. better performance of used chemicals) and/or optimized use of coating colour components (i.e. lower total formulation cost)

In order to manage the papermaking procedure in an effective way, it is inevitably required to measure and estimate the various changing parameters of wet-end process control. This content is devoted to the explanation of lab scale new investigating method regarding wet-end process of paper machine by using RDA.