• Title/Summary/Keyword: Breathable film

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Influence of Process Parameters on the Breathable Film Strength of Polymer Extrusion (고분자압출의 공정변수가 통기성필름강도에 미치는 영향)

  • Choi, Man-Sung
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.21 no.4
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    • pp.625-632
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    • 2012
  • Optimization of process parameters in polymer extrusion is an important task to reduce manufacturing cost. To determine the optimum values of the process parameters, it is essential to find their influence on the strength of polymer breathable thin film. The significance of six important process parameters namely, extruder cylinder temperature, extruder speed, extruder dies temperature, cooling roll temperature, stretching ratio, stretching roll temperature on breathable film strength of polymer extrusion was determined. Moreover, this paper presents the application of Taguchi method and analysis of variance (ANOVA) for maximization of the breathable film strength influenced by extrusion parameters. The optimum parameter combination of extrusion process was obtained by using the analysis of signal-to-noise ratio. The conclusion revealed that extruder speed and stretching ratio were the most influential factor on the film strength, respectively. The best results of film strength were obtained at higher extruder speed and stretching ratio.

Experimental Study of Moisture Vapor Transmission Rate(MVTR) for Breathable Film (통기성필름의 투습도에 관한 실험적 연구)

  • Choi, Man Sung
    • Journal of the Semiconductor & Display Technology
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    • v.15 no.2
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    • pp.81-86
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    • 2016
  • Moisture vapor transmission rate (MVTR) is an important item for many applications of polymer breathable thin film. To determine the optimum values of the process parameters, it is essential to find their influence on The significance of six important process parameters namely, extruder cylinder temperature, extruder speed, extruder dies temperature, cooling roll temperature, stretching ratio, stretching roll temperature on breathable film strength of polymer extrusion was determined. Moreover, this paper presents the application of Taguchi method and analysis of variance (ANOVA) for maximization of the breathable film MVTR influenced by extrusion parameters. The optimum parameter combination of extrusion process was obtained by using the analysis of signal-to-noise ratio. The conclusion revealed that extruder speed and stretching ratio were the most influential factor on the film strength, respectively. The best results of film MVTR were obtained at higher extruder speed and stretching ratio.

Fabrication of Breathable Film using Laser Pulses (레이저를 이용한 숨쉬는 필름 가공 기술 연구)

  • Choi, Hun Kook;Sohn, Ik Bu;Noh, Young Chul;Choi, Young Jin;Chang, In Gu
    • Journal of the Korean Society for Precision Engineering
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    • v.30 no.4
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    • pp.409-413
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    • 2013
  • A polypropylene film was ablated using a $CO_2$ laser, Ti-sapphire femtosecond laser, and UV nanosecond laser. For modified atmosphere packaging, polypropylene films were ablated by laser pulse with different pulse energies and measured on an optical microscope. Also, we observed the shelf life of a banana contained within packaging of a breathable zipper bag. As a result, we have demonstrated that the breathable film can efficiently extend the shelf life of respiring foods, particularly fresh fruits and vegetables. The development of breathable film laser microfabrication system will more useful for industrial applications.

High speed laser machining for breathable film using multi-pulse repeated radiation and diffractive beam splitter (레이저 멀티 펄스 중첩과 회절광학소자를 이용한 숨쉬는 필름 고속 가공 기술)

  • Yoo, Dongyoon;Choi, Hun-Kook;Sohn, Ik-Bu;Noh, Young-Chul;Lee, Yong-Tak;Kim, Young-Jae;Kim, Young-Han;Kang, Ho-Min;Noh, Jihwan
    • Laser Solutions
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    • v.17 no.3
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    • pp.15-18
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    • 2014
  • In this paper, we studied a machining method using a diffractive beam splitter (DBS) and multi- pulse repeated radiation for breathable film. We fabricated micro-grooves on polypropylene (PP) films using multi-pulse radiation and one-shot radiation (radiating pulses at once) and a DBS. In the result, width and depth of the PP film using multi-pulse repeated radiation were more precisely controllable. Therefore, this method can be applicable to in manufacturing breathable film precisely at a high speed.

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Fluoroalkylation of the Surface of Hydrophilic Polyurethane Breathable Membrane (플루오르알킬화에 의한 친수성 폴리우레탄 필름 표면의 개질)

  • Hwang, Ji-Hyun;Oh, Kyoung-Suk;Yoon, Nam-Sik
    • Textile Coloration and Finishing
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    • v.25 no.1
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    • pp.30-36
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    • 2013
  • Swelling and subsequent deformation of membranes by water wetting are regarded as a prime drawback of hydrophilic polyurethane breathable film. Fluoroalkylated surface was prepared by reacting the film with hexamethylene diisocyanate(HDI) and 2-perfluorohexyl ethanol. IR spectra and XPS results showed that the fluoroalkyl group was successfully introduced to the film surface with hexamethylene linkage. Water contact angle was increased from $68.7^{\circ}$ up to $144.2^{\circ}$ with the degree of fluoroalkylation. Decrease in water-vapor permeability was minimized even for the film of highest fluoroalkylation.

Study of the breathable film processing techniques for microwave oven using a laser (레이저를 이용한 전자렌지용 숨쉬는 필름 가공 기술 연구)

  • Sohn, Ik-Bu;Choi, Hun-Kook;Yoo, Dong-Yoon;Noh, Young-Chul;Kim, Joung-Nyon;Kang, Ho-Min
    • Laser Solutions
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    • v.16 no.2
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    • pp.16-18
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    • 2013
  • In this paper, we fabricated breathable films on the use of microwave oven by using UV nanosecond laser micromachining, and the number of micro-grooves on the film is controlled for different oxygen transfer rate(OTR). As different number of micro-groove, the breath films of 100,000cc, 120,000cc, and 150,000cc can be fabricated. The breath film package of 120,000cc is used for the experiment of steaming a sweet potato. At the result, the sweet potato is well-cooked with enough moisture in the package not bursted.

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Effect of Non-Perforated Breathable Films on the Storability of Sprout Vegetables in Modified Atmosphere Condition (레이저 가공 비천공 Breathable필름이 새싹채소의 Modified Atmosphere 저장에 미치는 영향)

  • Choi, In-Lee;Baek, Jun Pill;Kang, Ho-Min
    • Journal of Bio-Environment Control
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    • v.22 no.2
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    • pp.167-174
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    • 2013
  • Six kinds of sprout vegetables were applied three and six types of non-perforated breathable propylene films (NPB film) for individual and mixed modified atmosphere (MA) package condition at $10^{\circ}C$ on this study. As a tah tasai, kohlrabi, rape, chinese cabbage, red radish, broccoli sprouts were packaged by 20,000, 60,000, and 100,000 $cc{\cdot}m^{-2}{\cdot}day{\cdot}atm$ non-perforated breathable films for seven days storage. Mixed sprout vegetables were used 20,000 cc, 40,000 cc, 60,000 cc, 80,000 cc, and 100,000 $cc{\cdot}m^{-2}{\cdot}day{\cdot}atm$ non-perforated breathable films for seven days storage. Loss rate of fresh weight, changes of carbon dioxide, oxygen, and ethylene gas concentration were measured during the storage. Visual quality and off-flavor were rated by panel tests after seven days storage. Each sprout vegetable storage with film tests had been shown under the 0.5% fresh weight loss in every packaged films, and the 20,000cc NPB film package had been suitable atmosphere condition in the carbon dioxide and oxygen gas concentration. Appearance and off-odor of sprouts packaged with 20,000cc NPB film were shown better than other films because of the proper gas movement through the film to outside during the storage. Fresh weight loss of the mixed sprout vegetables had no difference among the NPB films for seven days storage. The 20,000 cc film had been resulted in that exchange rate of carbon dioxide and oxygen was highest cause of low film permeability than sprouts respiration. But the film is not good for storage because it has been made poor value of off-order even showed high visual quality from panel test after storage. 40,000 cc and 60,000 cc non-perforated breathable films were more suitable for mixed sprout vegetable storage at $10^{\circ}C$. These result suggested that 20,000 cc NPB film was good for single packaged sprout vegetable and 40,000 cc and 60,000 cc non-perforated breathable films were good for mixed packaged sprout vegetable.

Fabrication of Silica-Containing Breathable Waterproof Polyurethane Dispersion Film (Silica를 함유하는 Polyurethane dispersion 투습방수 Film의 제조)

  • Shin, Hyun-Ki;Huh, Man-Woo;Yoon, Nam-Sik
    • Textile Coloration and Finishing
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    • v.27 no.2
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    • pp.126-131
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    • 2015
  • Silica-polyurethane hybrid breathable films were prepared and their breathabilities were assessed. Appropriately aggregated silica was prepared through sol-gel reaction of water glass and its particle size ranged 360~500nm. The polyurethane dispersion was prepared by the reaction of isophorone diisocyanate(IPDI) as diisocyanate and polytetramethylene glycol(PTMG) and dimethylol propionic acid(DMPA) as polyol, particle size ranging 30~120nm. The reaction between isocyanate and hydroxyl group to form urethane bonding was checked by the intensity of the stretch peak of isocyanate at $2270cm^{-1}$ in the FT-IR. The silica was incorporated into polyurethane dispersion and casted into film. It was shown that the incorporated silica(1~5wt.%) increased water vapour permeability of the films by 30~100%, and decreased the hydrostatic pressure by 10~40%. From the results, it could be concluded that the appropriate hybridization of silica can increase the breathability of polyurethane dispersion film, while minimizing the loss of hydrostatic pressure.

Developing Designs and Making Men's Outdoor Breathable Waterproof Jackets with Solar Cells for Emergency Communications

  • Park, Jinhee
    • Journal of Fashion Business
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    • v.18 no.3
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    • pp.59-72
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    • 2014
  • This study provides the structural design for commercialization of outdoor breathable waterproof jackets for men merged with solar cells to enable emergency communications, utilizing wearable devices to develop smart clothing and extend convenience in everyday life. The most popular waterproof jacket with two-layer and three-layer moisture-permeable waterproof fabric was selected, based on previous studies of functional outdoor jackets and style with affinity to fashion. Flexible solar films suitable for clothing were embedded in the lining of the sleeve area and hood visor, and printed film was developed to balance weight and design. High performance smart solar jackets have application to expanding the use of smart phones for everyday and emergency communication, and leisure and outdoor sports activities, as well as day-to-day functions as a waterproof breathable outdoor jacket for men. It is also eco-friendly. Satisfying both the aesthetic and practical, a solar cell jacket with smart features, is an innovative tool for use in a variety of outdoor activities, and a fashion-forward commercialized product.

Life Cycle Assessment on Process of Breathable Film Production (통기성 필름 제조 공정의 전과정 평가)

  • Ahn, Joong Woo
    • Clean Technology
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    • v.23 no.4
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    • pp.388-392
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    • 2017
  • In this study, a quantitative environmental impact assessment for the production process of breathable film was conducted employing Life Cycle Assessment (LCA) methodology. Among the various categories, Global Warming (GW) accounted for the highest impact (97%) followed by Human Toxicity (HT). And the key substances of various impact categories included HDPE, PP, and electricity. In the production process, the high impact resulted from mixing process (57%), lamination process (29%), and extruder process (10%). To improve environmental impact, it is necessary to design a new process system that reduces the amount of electricity used and that increases production yields, if raw materials such as HDPE and PP owe excluded.