摘要:

Sheet molding compound (SMC) is a complex composite of specialty resins to which thickeners, inorganic fillers, fiber reinforcements, catalyst, mold re- lease, and pigment are added. It is produced in sheet form and can be molded by compression, transfer, and thermoset injection methods.

ISSN:0360-2559    

DOI:10.1080/03602558408070040

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor

摘要:

Plastics have been highly successful in replacing such conventional materials as metals, glass, and wood in a wide variety of applications due to their special property advantages such as high strength-to-weight ratio, corrosion resistance, versatility of part design, and ease of fabrication. The various plastic products are formed by processing polymers by one of the number of available tech- niques such as injection molding, compression molding, blow molding, profile extrusion, and sheet extrusion followed by stamping or thermoforming. In all these processes, the molten polymer is subjected to a wide range of shear rates and temperatures. During deformation, viscous heat is dissipated due to the friction between the highly viscous polymer melt and the various parts of the processing equipment that it comes in contact with. The viscous heat dis- sipated leads to a temperature rise, resulting in an offset of the setting of the extruder temperature profile with respect to throughput rate or screw speed. For all high output rate operations, it is essential to know the viscous heat gen- erated in order to appropriately design the conventional extruder screw so as to minimize the temperature increase in the process of plastication and to optimize the extruder temperature profile with respect to the throughput rate or screw speed. Viscous heat estimation is also critical when processing heat- sensitive polymers so as to maintain the melt temperature well below the de- gradation point.

ISSN:0360-2559    

DOI:10.1080/03602558408070041

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor

摘要:

Hot water is a difficult environment for olefins because it prematurely extracts antioxidants added to protect the base polymer, and appears to shorten service life dramatically [1]. Such deteriorations occur slowly and are difficult to study because temperature acceleration used in air exposures is limited by water's low boiling point. Methods for monitoring water effects are complicated by opaque fillers, antioxidants, and synergists, all of which interfere with conventional chemical analysis. A procedure for characterizing olefin deterioration in hot water and for comparing different formulations would be useful, especially if analysis techniques could be applied to in-service parts to verify laboratory results.

ISSN:0360-2559    

DOI:10.1080/03602558408070042

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor

摘要:

The intrinsic semiconductive nature of furnace-type carbon blacks [1] has re- sulted in their use as additives which render normally resistive polymers elec- trically conductive. Various grades of conductive carbon black are produced to provide optimum cost/performance balances in a wide range of conductive applications.

ISSN:0360-2559    

DOI:10.1080/03602558408070043

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor

摘要:

One of the important problems in the application of sheet molding compounds (SMC) in automobiles is how to join different structures together. In a previ- ous paper [1] a comparison between (adhesive) bonding strength and (metal) bolting strength was studied. It was found that bolting gave better joining strength than bonding. However, bolting creates stress concentration in the SMC and may be inconvenient in some applications.

ISSN:0360-2559    

DOI:10.1080/03602558408070044

出版商:Taylor & Francis Group    

年代:1984

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:10.1080/03602558408070039

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor