摘要:

The art, science, and engineering of thermoforming or biaxially stretching heated polymeric sheet has evolved substantially since three monographs on the subject were published in 1987. This review article updates the author's monograph [27] in the following rapidly developing areas: (a) newer thoughts on the constitutive equations of state for rubbery viscoelastic sheet; (b) the arithmetic of plane strain stretching during plug-assist thermoforming; (c) current schools of thought regarding finite element analysis, geometric analysis, and hybrid analysis for determining material distribution in thermoformed parts; (d) the unique constraints on crystallizing polyethylene terephthalate (CPET) for dual ovenable food container applications; (e) new criteria for thermoforming of multilayer rigid sheet; (f) protocols for determining steady-state physical property values in processing where regrind exhibits some property loss; and (g) some newer thoughts on the differences and similarities between pressure forming and conventional vacuum forming. It is hoped that this material bridges the gap between the current crop of monographs and those manuscripts that are currently being written.

ISSN:0360-2559    

DOI:10.1080/03602559108021007

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

Recycled poly(ethylene terephthalate), PET, mainly recovered from beverage bottles, can be used to produce unsaturated polyester resins. The mechanical and durability properties of polymer concrete (PC) systems made with these resins have been investigated. The properties of PC using resins based on recycled PET are comparable to those PCs made from virgin materials. Resins using recycled PET offer the possibility of a lower source cost for forming useful PC-based products. Also, the recycling of PET in PC would help alleviate an environmental problem and would save energy. Potential applications for such PC materials include precast components; repair materials for portland cement concrete; and bridge, wall, and floor overlays.

ISSN:0360-2559    

DOI:10.1080/03602559108021008

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

Demand for plastic resins in the United States is expected to hit 76 billion pounds by the year 2000 [1]. Consumers like the convenience, strength, and design flexibility that plastics provide. The U.S. currently generates about 320 billion pounds of municipal solid waste (MSW), or postconsumer waste, with about 85 % of this disposed of in landfills. Projections by the U.S. Environmental Protection Agency (EPA) estimate that MSW will reach 380 billion pounds by the year 2000 while a third of the landfills are expected to close in the next 5 years [2]. While plastics make up only about 7% of solid wastes they are a very visible 30% of MSW. Although recycling efforts may affect the EPA projection for year 2000-especially for metals, glass, and paper in the MSW stream-with only 1 % of plastics recovered in 1989, considerable progress is needed with plastics. With projected throw-away plastics waste of 38 billion pounds for year 2000 (up from 22 billion pounds of plastics waste in 1987) and an expected loss of a third of the landfills [2], increased use of incineration will probably be employed for plastics and other wastes. This presents potentially serious problems from the viewpoint of heavy metals emissions, the subject of the present paper.

ISSN:0360-2559    

DOI:10.1080/03602559108021009

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

This is a scanned image of the original Editorial Board page(s) for this issue.

ISSN:0360-2559    

DOI:10.1080/03602559108021006

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor