• Title/Summary/Keyword: 폴리스티렌폼

Search Result 25, Processing Time 0.021 seconds

최근 완충재 개발동향

  • 한국포장협회
    • The monthly packaging world
    • /
    • s.6
    • /
    • pp.46-51
    • /
    • 1993
  • 최근 대표적인 완충재로 사용되어 오던 EPS(발포폴리스티렌)의 사용이 규제됨에 따라 환경적응형 완충재의 중요성이 더욱 강조되고 있다. 완충재는 수송시 제품에 가해지는 충격을 줄여 제품을 최대한 보호하는 역할을 한다. 일반적으로 사용되고 있는 플라스틱 완충재로는 폴리에틸렌 폼(polyethylene foam), 폴리프로필렌 폼(polypropylene foam), 폴리우레탄 폼(polyuretane)등이 있고 종이를 소재로 한 형태도 있다. 이 글에서는

  • PDF

An Experimental Study on the Punching Shear of Slab with Polystyrene Form (폴리스티렌 폼을 사용한 슬래브의 뚫림전단에 관한 실험적 연구)

  • Lee, Hwan-Gu;Kim, Seung-Hun;Kang, In-Suk;Lee, Han-Seung;Lee, Ki-Jang
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • 2008.04a
    • /
    • pp.213-216
    • /
    • 2008
  • When using the light-weight form with polystyrene on slab, as a result of reducing the weight of slab, the span was increased or size of supporting member for slab was decreased. But capacity of punching shear resistance on the slab using the polystyrene form with plat plate system was deteriorated at critical section around the column. But standard for estimate of internal force did not exist, and established study was insufficient. This study performed the experiment on the punching shear for understanding punching shear force at the slab-column connection using the slab with polystyrene form. The principal variable was size of column, arrangement of polystyrene form and existence of shear reinforcement, and we planned four specimens. From the test, we analysed the crack, failure mode, road-displacement graph and punching shear strength, and capacity of punching shear resistance for slab using the polystyrene form was understood.

  • PDF

The Combustion Gases Toxicity Evaluation of Plastics Material by Colorimetric Gas Detector Tubes (가스검지관법에 의한 플라스틱재료의 연소가스 독성평가)

  • 박영근;김동일;현성호
    • Fire Science and Engineering
    • /
    • v.16 no.4
    • /
    • pp.77-84
    • /
    • 2002
  • In this paper, we had analyzed comsbustion gases using a GASTEC colorimetric gas detector tube according to the method of NES 713 in order to combustion gases toxicity evaluation for beads polystyrene foam, extruded polystyrene foam, rigid polyurethane foam, flexible polyurethane foam, flexible polyvinyl chloride pipe, vinyl floor cover, polyethyelene foam(flame retardant untreated) and polyethyelene foam (flame retardant treated) of plastics material. As results of gas analyses by using this method, comsbustion gases producted from small specimens of plastics material had reached fatal to man at 30 minutes exposure time that had possesed toxicity index of more than 1. Toxicity indexes of each specimen were estimated range of 4.3∼179.2, flexible polyvinyl chloride showed the hightest toxicity index at 179.2, and beads polystyrene foams showed the lowest toxicity index at 4.3.

Laser Processing Characteristic of Polystyrene Foam Pattern (폴리스티렌 폼 패턴의 레이저 가공 특성)

  • Kim, Jae-Do;Kang, Kyoung-Ho
    • Transactions of the Korean Society of Mechanical Engineers A
    • /
    • v.27 no.5
    • /
    • pp.772-778
    • /
    • 2003
  • Polystyrene foam is easily melted and vapoured by heat, has a proper quality in the pattern manufacturing and has a low price. The objective of this study is to develop a rapid prototyping method fur polystyrene foam pattern manufacuring to use the eliminative pattern casting (EPC). Applying fur the rapid prototyping concept reversely, the unnecessary part of section is vapored away by heat source of laser beam. In order to examine the applicability between laser beam process and polystyrene foam material, the basic experiments such as hole, line, plane and contour process are carried out. With these results, various three-dimensional shape patterns are made and this rapid prototyping tool for polystyrene foam manufacturing.

Development and Design of Variable Lamination Manufacturing (VLM) Process by Using Expandable Polystyrene Foam (발포 폴리스티렌 폼을 이용한 가변 적층 쾌속 조형 공정 설계 및 개발)

  • 안동규;이상호;양동열;신보성;박승교;이용일
    • Proceedings of the Korean Society of Precision Engineering Conference
    • /
    • 2000.11a
    • /
    • pp.759-762
    • /
    • 2000
  • Rapid Prototyping (RP) techniques have their unique characteristics according to the working principles: stair-stepped surface of parts due to layer-by-layer stacking, low build speed caused by line-by-line solidification to build one layer, and additional post processing to improve surface roughness, so it is required very high cost to introduce and to maintain RP apparatus. The objective of this study is to develop and design a new RP process, Variable Lamination Manufacturing using expandable polystyrene foam sheet as part material (VLM-S), which can make up for the disadvantage of existing techniques, and to develop an apparatus to implement the process. In order to examine the possibility of practical utilization of the proposed VLM-S process for prototyping of a general three-dimensional shape, an auto-shift lever knob and a pyramid shape were fabricated.

  • PDF

Investigation of Thermal Characteristics and Skeleton Size Effects to improve Dimensional Accuracy of Variable Lamination Manufacturing by using EPS Foam (발포 폴리스티렌 폼을 이용한 가변적층 쾌속조형공정의 형상 정밀도 개선을 위한 열전달 특성 및 잔여 재료폭 영향에 관한 연구)

  • 안동규;이상호;양동열
    • Proceedings of the Korean Society of Precision Engineering Conference
    • /
    • 2001.04a
    • /
    • pp.910-913
    • /
    • 2001
  • Rapid Prototyping(RP) techniques have unique characteristics according to their working principle: the stair-stepped surface of a part due to layer-by-layer stacking, low building speed, and additional post-processing to improve surface roughness. A new RP process, Variable Lamination Manufacturing by using expandable polystyrene foam(VLM-S), has been developed to overcome the unfavorable characteristics. The objective of this study is to investigate the thermal characteristics and skeleton size effects as the hotwire cuts EPS foam sheet in order to improve dimensional accuracy of the parts, which is produced by VLM-S. Empirical and analytical approaches are performed to find the relationship between cutting speed and heat input, and the relationship between maximum available cutting speed and heat input. In addition, empirical approaches are carried out to find the relationship between cutting error and skeleton size, and cutting deviation and skeleton size. Based on these results, the optimal hotwire cutting condition and available minimum skeleton size are derived. The outcomes of this study are reflecting in the enhancement of VLM-S input data generation S/W.

  • PDF

Investigation of Cutting Characteristics of Linear Hotwire Cutting System and Bonding Characteristics of Expandable Polystyrene Foam for Variable Lamination Manufacturing(VLM) Process (가변 적층 쾌속 조형 공저 개발을 위한 발포 폴리스티렌폼의 선형 열선 절단시스템 절단 특성 및 접착강도 특성에 대한 연구)

  • Ahn, Dong-Gyu;Lee, Sang-Ho;Yang, Dong-Yol;Shin, Bo-Sung;Lee, Yong-Il
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.17 no.12
    • /
    • pp.185-194
    • /
    • 2000
  • Rapid Prototyping(RP) techniques have their unique characteristics according to the working principles: stair-stepped surface of parts due to layer-by-layer stacking, low build speed caused by line-by-line solidification to build one layer, and additional post processing to improve surface roughness, so it is required very high cost to introduce and to maintain of RP apparatus. The objective of this study is to develop a new RP process, Variable Lamination Manufacturing using linear hotwire cutting technique and expandable polystyrene foam sheet as part material(VLM-S), and to investigate characteristics of part material, cutting characteristics by using linear hotwire cutting system and bonding. Experiments were carried out to investigate mechanical properties of part material such as anisotropy and directional tensile strength. In order to obtain optimal dimensional accuracy, surface roughness, and reduced cutting time, addition experiments were performed to find the relationship between cutting speed and cutting offset of hotwire, and heat generation of hotwire per unit length. So, adhesion strength tests according to ASTM test procedure showed that delamination did not occur at bonded area. Based on the data, a clover-shape was fabricated using unit shape part(USP) it is generated hotwire cutting. The results of present study have been reflected on the enhancement of the VLM-S process and apparatus.

  • PDF

Development of Resources Technique for the Marine Debris(II) - Development of thermal extrusion system for the resource of waste polystyrene buoy - (수거된 해양폐기물 자원화 기술 개발(II) - 어구용 폐스티로폼의 자원화를 위한 열적 감용시스템 개발 -)

  • Keel Sang-In;Kim Seock-Joon;Yun Jin-Han;Kang Chang-Gu;Yu Jeong-Seok
    • Journal of the Korean Society for Marine Environment & Energy
    • /
    • v.5 no.2
    • /
    • pp.35-40
    • /
    • 2002
  • By the introduction of cleaning and drying processes, thermal extrusion system for the volume reduction of used polystyrene buoys was developed. It was tested in the costal area for the determination of operational reliability. By the removal of oyster shells and cleaning of salt, waste polystyrene buoys was changed to the raw material of plastics. The lower cost of one-tenth compared with that of the outer request treatment is promising the practical use of waste buoys' volume reduction system.

  • PDF

Development of Variable Lamination Manufacturing(VLM) Process and Apparatus by Using Expandable Polystyrene Foam (발포 폴리스티렌 폼을 이용한 가변 적층 쾌속 조형 공정 밀 장치 개발)

  • Ahn, Dong-Gyu;Lee, Sang-Ho;Yang, Dong-Yol;Shin, Bo-Sung;Park, Seung-Kyo;Lee, Yong-Il
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.18 no.8
    • /
    • pp.54-63
    • /
    • 2001
  • Rapid Prototyping(RP) techniques have their unique characteristics according to the working principles: stair-stepped surface of a part due to layer-by-layer stacking, low build speed caused by point-by-point or line-by-line solidification to build one layer, and additional posts processing to improve surface roughness, so high cost is required to introduce and to maintain the RP apparatus. The objective of this study is to develop a new RP process, Variable Lamination Manufacturing by using expandable polystyrene foam sheet as part material(VLM-S), and to design an apparatus for implementation of the process. So, the process parameters and design criterions of the apparatus were defined and the techniques were proposed to satisfy the design criterion. Based on the results, a knob-shape, pyramid shape. and a solid block were fabricated on the apparatus in which unit shape part(USP) was generated for building each layer.

  • PDF

Fire Characteristics of Plastic Insulating Materials from Cone Calorimeter Test (콘칼로리미터를 이용한 플라스틱 단열재의 화재특성)

  • 이근원;김관응
    • Fire Science and Engineering
    • /
    • v.17 no.1
    • /
    • pp.76-84
    • /
    • 2003
  • This study was designed to investigate fire characteristics of the plastics insulating materials such as a polystyrene foam, polyurethane foam, and polyethylene foam, which is used an insulating materials i3t workplace. The fire characteristics of plastic insulating materials were carried out from the Cone Calorimeter test according to ISO 5660. The experimental materials used were commercial plastic insulating materials by products and their composition is not disclosed by the manufacturer. As the results of this study; the heat release rate of plastic insulating materials was increased with increasing density and heat flux. The peak heat release rate and the average heat release rate for the polyethylene foam in insulating materials were showed the highest, and the peak heat release rate for the polyethylene foam was the highest. The standard of heat release rate with a kind of products and heat flux of irradiance to prevent fire by plastic insulating materials was suggested.