Experimental study of the thermoforming of a blend of styrene-butadiene copolymer with polystyrene.: An article from: Polymer Engineering and Science
Book Details
Author(s)M.J. Stephenson, M.E. Ryan
PublisherSociety of Plastics Engineers, Inc.
ISBN / ASINB00097KTRS
ISBN-13978B00097KTR8
AvailabilityAvailable for download now
MarketplaceUnited States 🇺🇸
Description
This digital document is an article from Polymer Engineering and Science, published by Society of Plastics Engineers, Inc. on February 1, 1997. The length of the article is 4313 words. The page length shown above is based on a typical 300-word page. The article is delivered in HTML format and is available in your Amazon.com Digital Locker immediately after purchase. You can view it with any web browser.
From the author: Material characterization and thermoforming studies were completed using a blend of a styrene-butadiene copolymer with polystyrene used commercially for the production of cups and dishes. This composition was thermoformed between 135 and 152 [degrees] C. Studies consisted of forming 30-mil and 46-mil sheets at 130, 140, and 150 [degrees] C at three evacuation rates in an aluminum cylindrical mold. The mold was instrumented with a pressure transducer to follow the change in pressure during forming and two Linear Voltage Displacement Transducers, which served as mold wall contact sensors. The results indicated that the process is extremely rapid (0.25-0.60 sec) for the high and medium evacuation rates. The process was found to require a low pressure differential for forming (typically [less than]4 psi). The final part thickness distribution and extension ratio data indicated that the material stretches into the approximate shape of a spherical segment, contacts the bottom/ center of the mold, contacts the sides, and finally stretches into the corners. The tensile strength and modulus of elasticity measurements of the final part were slightly less than the original sheet properties for samples measured in the machine direction but slightly greater for samples taken in the transverse direction. However, the percent elongation at break increased significantly in both the machine and transverse directions.
Citation Details
Title: Experimental study of the thermoforming of a blend of styrene-butadiene copolymer with polystyrene.
Author: M.J. Stephenson
Publication:Polymer Engineering and Science (Refereed)
Date: February 1, 1997
Publisher: Society of Plastics Engineers, Inc.
Volume: v37 Issue: n2 Page: p450(10)
Distributed by Thomson Gale
From the author: Material characterization and thermoforming studies were completed using a blend of a styrene-butadiene copolymer with polystyrene used commercially for the production of cups and dishes. This composition was thermoformed between 135 and 152 [degrees] C. Studies consisted of forming 30-mil and 46-mil sheets at 130, 140, and 150 [degrees] C at three evacuation rates in an aluminum cylindrical mold. The mold was instrumented with a pressure transducer to follow the change in pressure during forming and two Linear Voltage Displacement Transducers, which served as mold wall contact sensors. The results indicated that the process is extremely rapid (0.25-0.60 sec) for the high and medium evacuation rates. The process was found to require a low pressure differential for forming (typically [less than]4 psi). The final part thickness distribution and extension ratio data indicated that the material stretches into the approximate shape of a spherical segment, contacts the bottom/ center of the mold, contacts the sides, and finally stretches into the corners. The tensile strength and modulus of elasticity measurements of the final part were slightly less than the original sheet properties for samples measured in the machine direction but slightly greater for samples taken in the transverse direction. However, the percent elongation at break increased significantly in both the machine and transverse directions.
Citation Details
Title: Experimental study of the thermoforming of a blend of styrene-butadiene copolymer with polystyrene.
Author: M.J. Stephenson
Publication:Polymer Engineering and Science (Refereed)
Date: February 1, 1997
Publisher: Society of Plastics Engineers, Inc.
Volume: v37 Issue: n2 Page: p450(10)
Distributed by Thomson Gale
