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School of Materials Science and Engineering

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https://hdl.handle.net/1853/70762

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College of Engineering

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https://finding-aids.library.gatech.edu/agents/corporate_entities/1126

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Publication Search Results

Now showing 1 - 10 of 36

Robust Reverse Production Design for Carpet Recycling

(Georgia Institute of Technology, 1999-05-18) Newton, David ; Realff, Matthew J. ; Ammons, Jane C. ; Madnani, Mohit
Size Reduction Technology for Carpet Waste

(Georgia Institute of Technology, 1999-05-18) Hensel, Edward

A performance summary of a mechanical size reduction technology is presented. Results demonstrate the time required to perform size reduction on a bale of carpet waste, and the resulting volume reduction achieved therefrom. The reduction in volume is then related to operating cost of the size reduction equipment, to estimate the total cost of reduction. The characteristics of the size-reduced material are presented in a form to suggest alternative uses for the waste materials.
An Overview of Commercial Recycling Technologies and Textile Application for the Products

(Georgia Institute of Technology, 1999-05-18) Hawn, Kenneth L.
Compression Molding of Square Pipe using Wastes of Synthetic and Natural Fabrics

(Georgia Institute of Technology, 1999-05-18) Katori, Shigetaka ; Kimura, Teruo ; Kyoto Institute of Technology

The consideration of this work focuses on the application of recycled waste fabrics. The simple compression molding method was proposed here for molding the square pipe with low thermal conductivity by using the waste of synthetic and natural fabrics as molding rare materials. The cut waste of PBS non-woven fabrics and wastes of woven and non-woven natural fabrics such as cotton including air layer were selected as representative wastes of fabrics. The PBS was melted by using hot press as a matrix of square pipe. In the combination of fabrics used in this paper, the molded square pipe has a biodegradable property.
Air Lay Technology for Processing Carpet Waste

(Georgia Institute of Technology, 1999-05-18) Oberlehner, Fritz
Novel Principle for Mechanical Recycling of Carpet Waste Using Pressure Shear Pulverization Process

(Georgia Institute of Technology, 1999-05-18) Shutov, F.

A proprietary Pressure Shear Pulverization (PSP) process based on Bridgmen Effect (combined action of pressure and shear forces) was developed for mechanical recycling by pulverization of various single and mixed thermoplastic and thermosetting waste, as well as polymer composites. For this study the PSP process has been used for recycling post-consume PVC-PET carpet waste. Using the PSP lab-scale machine, a fine commingled powder was produced. SEM analysis demonstrates that the powder consists of very fine PVC flake-type particles (size of 300 microns) and very short PET fiber-type particles (size of 0.5-1.0 mm). For further compression molding processing of the secondary polymeric items, the mechanically recycled powder has been applied using two approaches. First, commingled powder was used as a filler to produce composites based on PVC binder (virgin or waste one). Second, separated by shaking sieve technique PET fibers or PVC particles were used as fillers or co-components for PET or PVC binders (virgin or waste ones). Both secondary solid and foamed materials might be produced. Thus, the PSP method represents a new alternative for mechanical recycling of carpet waste using a very inexpensive and environmentally friendly technique.
LCA Issues for Understanding the Environmental Profile of Carpet

(Georgia Institute of Technology, 1999-05-18) Yaros, Bernard R. ; Chaffee, Chet ; Boustead Consulting & Associates, Ltd.

Environmental expectations for the carpet industry have changed over the years. Suppliers, customers, and investors now expect industry to incorporate environmental concerns into their business practices in an effort to minimize the environmental impacts from raw materials, manufacturing, packaging, shipping, use and end-of-life disposal or recycling. One tool that can provide appropriate environmental understanding is the life cycle inventory (LCI) or the LCI building block known as an eco-profile. A cradle to gate eco-profile using life cycle inventory methods has been prepared for the production of carpet, using the Boustead Model and database. The initial analysis of the environmental aspects of the carpet system can be used a building block by the carpet industry to further understand issues of raw materials consumption, energy use, process and product improvements, and end-of-life disposal and recycling options. An illustration is also provided showing how life cycle data from an eco-profile study can be used by the carpet industry as the basis for constructive environmental discussions with key suppliers, customers and consumers.
Plasmon excitations in carbon onions: Model vs. measurements

(Georgia Institute of Technology, 1998-03) Stöckli, Thomas ; Wang, Z. L. (Zhong Lin) ; Bonard, Jean-Marc ; Stadelmann, Pierre ; Châtelain, André

Non-relativistic local dielectric response theory has proven successful in the interpretation of Electron Energy Loss data of nanometer-size isotropic particles of different geometries. In previous work, we have adapted this model to take into account anisotropy as encountered in the case of carbon onions. We have shown that this anisotropy needs to be taken into account since important deviations with respect to an isotropic model can be observed. In this contribution, we report on the first energy filtered images of carbon onions and compare intensity profiles across the spheres to our calculations.
Microsortation of Post-Consumer Plastics Using Near-Critical Liquids

(Georgia Institute of Technology, 1997-05-21) Karmana, Eddy ; Enick, Robert

The microsortation of clean, dry, mixed, shredded, post-consumer polyolefins can be accomplished using near-critical carbon dioxide as a float-sink medium. At high loadings of plastics, however, buoyant forces alone are not sufficient to break up the aggregates of interlocking shredded plastic particles. Therefore a close-clearance impeller must be used to agitate the mixed plastics during the batch separation. This slight agitation permits these irregularly shaped chips to either float or sink without being hindered by surrounding chips. The separation apparatus operates most efficiently when the plastics are charged to a level that corresponds to the top of the highest blade of a large-diameter multiple-pitched blade impeller that rotates at 15 rpm. A post-consumer flake mixture of 85%HDPE/15%PP can be sorted into HDPE and PP streams of 99+% purity at loadings up to 56 volume%. In the absence of an impeller, high purity separations can be achieved at loadings of only 2 volume%. This dramatic increase in the loading reduces the estimated processing cost of mixed polyolefins to $0.03-0.05/lb, enhancing the economic feasibility of this high pressure, C02-based microsortation process. Immersion of these plastics in this high pressure environment during the separation resulted in insignificant changes in the plastics' properties.
Automatic, Continuous Filtration of Highly Contaminated Melts

(Georgia Institute of Technology, 1997-05-21) Darley, Dana