• 전력전자학회:학술대회논문집
• /
• 전력전자학회 2005년도 전력전자학술대회 논문집
• /
• pp.466-468
• /
• 2005

Recently, the demand for the development of high quality and high speed laser printer and efficient power utilizations are required. Among complicate electro-mechanic devices in laser printer, the toner fusing unit consumes above 90[%] of all electrical energy needed for printing devices. Therefore, the development of more effective energy-saving toner fusing process becomes a significant task of much great demand. Generally, there are several way to implement fusing unit, among them this paper present a new hybrid induction heating method. The proposed induction heating method enables to increase coupling coefficient between heating coil and heat roller also to Increase total energy transfer efficiency. Therefore the proposed IH inverter system provide very fast W.U.T.(Warm UP Time), also high efficiency. Through experimental result, the proposed control system is verified.

• 한국염색가공학회지
• /
• 제8권3호
• /
• pp.66-71
• /
• 1996

최근 섬유제품의 소비패턴이 고급화, 다양화, 개성화됨에 따라 이에 부응한 고기능성과 감성을 지닌 제품의 생산이 요구되고 있다. 이러한 요구에 따라 날염은 유행의 변화에 신속하게 대응하고 다양한 색상과 디자인의 변화를 부여함으로써 각광을 받으며 발전하여 왔다. 그러나 소비자의 요구는 화려한 색상과 정교한 디자인을 요구하고 있으며 점차 환경규제가 높아지고 있으므로 여기에 대응한 날염기술의 발전이 시급한 실정이다. 전사날염기술은 이러한 요구를 만족시킬수 있다는 점에서 관심의 대상이 되어 폭발적인 인기를 누리며 발전하여 왔다. 또한 전사날염은 衣料用 섬유소재 뿐 아니라 카페트, 인테리어 제품과 다른 소재에의 적용으로 확대되어지고 있다. 그러나 열전사날염은 천연섬유에 적용하기 어려운 문제점도 있다. 이 글에서는 전사날염의 개요를 알아보고 천연섬유및 그 혼방품에 대한 실용화를 위한 시도방법과 섬유제품이외의 소재에 대한 응용방법에 대하여 알아보고자 한다.

• 복식문화연구
• /
• 제29권1호
• /
• pp.134-151
• /
• 2021

The aim of this research is to develop a clothing and textiles studio course for preservice home economics teachers applying principles of Project-Based Learning (PBL) and maker education to equip future teachers with the ability to nurture creativity among adolescents. The studio course was developed in the following stages: analysis, design, development, implementation, and evaluation. We concluded that the resulting course met the following objectives extracted from the 2015 revised curriculum of home economics subjects: to promote creative and environmentally-friendly fashion design and styling abilities, gain the ability to use makerspace tools, understand flat pattern making and sewing processes, and develop creative thinking, aesthetic sense, and communication skills. Furthermore, the educational effects of PBL and maker education were confirmed through student comments on the course. Students mentioned the practicality of the material in their actual lives along with their enhanced integration of the subject material, self-directedness, aesthetic sense, ability to learn through trial and error, collaboration and communication, and sharing. Based on results from the implementation and evaluation stages, a clothing and textiles studio course should include the following modules: introduction of terms and tools, submission and sharing of clothing reformation and upcycling techniques, introduction to hand sewing, pouch making, heat-transfer printing, 3D printing, mask making, hat making, vest making, and the final team project on fashion styling. It is important for instructors to provide detailed guidelines on selecting personas for styling, looking for available materials, and selecting materials online.

• 한국펄프종이공학회:학술대회논문집
• /
• 한국펄프종이공학회 2006년도 PAN PACIFIC CONFERENCE vol.1
• /
• pp.19-29
• /
• 2006

Drying is the least developed of all unit operations of paper and board manufacture. While groundbreaking developments were Introduced during the several past decades in forming, pressing and calendering, no radical changes occurred in drying. The cylinder-drying technology is now more than 200 years old and, while it was subject to many incremental improvements, many of its inherent problems persist. We believe that conventional drying is now approaching the end of its life and the industry is ready for a major breakthrough in drying. Indeed several innovative technologies already exist at various stages of development or commercialization. In general, the novel drying technologies are striving to increase the drying rate, improve the product quality and boost the energy efficiency of drying. A novel, drying method, $Papridry^{TM}$, which combines conductive and convective heat transfer to obtain very high drying rates, is at an advanced stage of development at Paprican. The results obtained when drying printing paper ana board on a self-standing pilot $Papridry^{TM}$ machine and on the pilot paper machine equipped with a tandem of two $Papridry^{TM}$ units demonstrate both, the high drying rate and improved product quality achieved by using this drying method. A mathematical model of this operation has been developed and the software compiled with this model was used to calculate the effect of installing a $Papridry^{TM}$ unit into an existing dryer section. The model also allows to calculate the z-direction distribution of moisture and temperature at various points of the dryer section.

• Design & Manufacturing
• /
• 제14권1호
• /
• pp.1-7
• /
• 2020

In this study, the variation of the shrinkage in the thickness direction of the molded parts according to the gate size of the polymer core fabricated through the 3D printer using the SLS method was studied. The polymer cores are laser sintered and the powder material is nylon base PA2200. The polymer cores have lower heat transfer rate and rigidity than the metal core due to the characteristics of the material. Therefore, the injection molding test conditions are set to minimize the deformation of the core during the injection process. The resin used in the injection molding test is a PP material. The packing condition was set to 80, 90 and 100% of the maximum injection pressure for each gate size. The runner diameter used was ∅3mm, and the gates were fabricated in semicircle shapes with cross sections 1, 2, and 3 ㎟, respectively. Thickness measurement was performed for 10 points at 2.5 mm intervals from the point 2.5 mm away from the gate, and the shrinkage to thickness was measured for each point. The shrinkage rate according to the gate size tends to decrease as the cross-sectional area decreases as the maximum injection pressure increases. The average thickness shrinkage rate was close to 0% when the packing pressure was 90% for the gate area of 1mm2. When the holding pressure was set to 100%, the shrinkage was found to decrease by 3% from the standard dimension due to the over-packing phenomenon. Therefore, the smaller the gate, the more closely the molded dimensions can be molded due to the high pressure generation. It was confirmed that precise packing process control is necessary because over-packing phenomenon may occur.

• 한국융합학회논문지
• /
• 제8권4호
• /
• pp.199-205
• /
• 2017

이 연구에서는 3D 프린터 히팅 블록의 발열로 인해 가이드로 열이 전달되어 필라멘트가 녹는 문제점을 개선하기 위해 설계 해석과 폭발압접을 융합한 방법으로 클래드 판재를 만들었다. 클래드 판재에 대한 전단 강도시험을 하였으며, 히팅 블록으로 가공한 다음 열 해석, 열전도도, 열화상 측정 결과 다음과 같은 결론을 얻었다. 구리와 타이타늄 클래드 판재로 만든 히팅 블록에 대하여 3D 모델링 열 해석 한 결과 필라멘트 가이드 부위의 표면온도가 히팅 블록 표면온도 보다 낮은 온도가 예측되었다. 구리와 타이타늄 클래드 판재로 만든 다음 전단 강도를 측정한 결과 평균 195.6MPa 값을 얻었다. 구리와 타이타늄 클래드 판재로 만든 히팅 블록에 대하여 열전도도를 3회 측정한 결과 평균 $62.52W/m{\cdot}K$값을 나타내었다. 구리와 타이타늄 클래드 판재로 만든 히팅 블록에 대하여 열화상 카메라로 표면 온도를 측정한 결과 최대 $107.3^{\circ}C$ 측정되었으며, 필라멘트 가이드 부근에서는 $183.2^{\circ}C$ 측정되었다. 기존 필라멘트의 부위의 온도 보다 $89^{\circ}C$ 낮은 온도 분포를 보였다.