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Rubber Division opens spring meeting
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BEACHWOOD, Ohio—A keynote address and the 25-Year Club countdown to the person with the most years in the rubber industry highlighted the first day of the ACS Rubber Division's spring...
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BEACHWOOD, Ohio—A keynote address and the 25-Year Club countdown to the person with the most years in the rubber industry highlighted the first day of the ACS Rubber Division's spring technical meeting. BEACHWOOD, Ohio—A keynote address and the 25-Year Club countdown to the person with the most years in the rubber industry highlighted the first day of the ACS Rubber Division's spring technical meeting. $BEACHWOOD, Ohio—A keynote address and the 25-Year Club countdown to the person with the most years in the rubber industry highlighted the first day of the ACS Rubber Division's spring technical meeting.
Food waste emerges as possible rubber filler
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WOOSTER, Ohio—Eggshells and other food waste may be the next phase of sustainable manufacturing practices for the tire and rubber product industry, as a replacement for carbon black....
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WOOSTER, Ohio—Eggshells and other food waste may be the next phase of sustainable manufacturing practices for the tire and rubber product industry, as a replacement for carbon black. WOOSTER, Ohio—Eggshells and other food waste may be the next phase of sustainable manufacturing practices for the tire and rubber product industry, as a replacement for carbon black. $WOOSTER, Ohio—Eggshells and other food waste may be the next phase of sustainable manufacturing practices for the tire and rubber product industry, as a replacement for carbon black.
Supreme Court reverses damage award against Goodyear
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WASHINGTON—In an 8-0 decision, the U.S. Supreme Court reversed and remanded a $2.74 million damage award against Goodyear and two attorneys who represented the tire maker in a product...
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WASHINGTON—In an 8-0 decision, the U.S. Supreme Court reversed and remanded a $2.74 million damage award against Goodyear and two attorneys who represented the tire maker in a product liability lawsuit. WASHINGTON—In an 8-0 decision, the U.S. Supreme Court reversed and remanded a $2.74 million damage award against Goodyear and two attorneys who represented the tire maker in a product liability lawsuit. $WASHINGTON—In an 8-0 decision, the U.S. Supreme Court reversed and remanded a $2.74 million damage award against Goodyear and two attorneys who represented the tire maker in a product liability lawsuit.
American Biltrite project starts to pay off
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SAN ANTONIO—It's taken some patience and education, but American Biltrite (Canada) Ltd. finally is seeing business growth from a project it's been working on for more than three years. The...
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SAN ANTONIO—It's taken some patience and education, but American Biltrite finally is seeing business growth from a project it's been working on for more than three years. SAN ANTONIO—It's taken some patience and education, but American Biltrite finally is seeing business growth from a project it's been working on for more than three years. $SAN ANTONIO—It's taken some patience and education, but American Biltrite finally is seeing business growth from a project it's been working on for more than three years.
Cabot invests to upgrade Malaysia facility
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BOSTON—Cabot Corp.'s stake in the elastomer composite market, with a heavy focus on tire and industrial rubber products, is growing. The global specialty chemicals and performance materials ...
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BOSTON—Cabot is making a strategic investment to expand and upgrade its manufacturing capabilities for elastomer composites at its plant in Port Dickson, Malaysia. BOSTON—Cabot is making a strategic investment to expand and upgrade its manufacturing capabilities for elastomer composites at its plant in Port Dickson, Malaysia. $BOSTON—Cabot is making a strategic investment to expand and upgrade its manufacturing capabilities for elastomer composites at its plant in Port Dickson, Malaysia.
NAM honors U.S. senator for his support of manufacturing
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AKRON—The National Association of Manufacturers recognized U.S. Sen. Rob Portman, R-OH, with the NAM Award for Manufacturing Legislative Excellence, which was presented during an ceremony at ...
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AKRON—The National Association of Manufacturers recognized U.S. Sen. Rob Portman, R-OH, with the NAM Award for Manufacturing Legislative Excellence. AKRON—The National Association of Manufacturers recognized U.S. Sen. Rob Portman, R-OH, with the NAM Award for Manufacturing Legislative Excellence. $AKRON—The National Association of Manufacturers recognized U.S. Sen. Rob Portman, R-OH, with the NAM Award for Manufacturing Legislative Excellence.
Cheng Shin set to open two tire plants
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CHUNGHWA, Taiwan — Cheng Shin Rubber Industrial Co. Ltd.'s new plants in India and Indonesia will start production this year, the Taiwanese tire maker disclosed at its recent investor...
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CHUNGHWA, Taiwan—Cheng Shin, which goes to market under the Maxxis brand, is ready to start up its new plants in India and Indonesia. CHUNGHWA, Taiwan—Cheng Shin, which goes to market under the Maxxis brand, is ready to start up its new plants in India and Indonesia. $CHUNGHWA, Taiwan—Cheng Shin, which goes to market under the Maxxis brand, is ready to start up its new plants in India and Indonesia.
USW files complaint regarding China truck, bus tire decision
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WASHINGTON—The United Steelworkers has filed a complaint with the U.S. Court of International Trade seeking judicial review of the U.S. International Trade Commission's recent negative...
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WASHINGTON—The United Steelworkers has filed a complaint with the U.S. Court of International Trade seeking judicial review of the U.S. International Trade Commission's recent negative determination in the ITC's investigation of truck and bus tires from China. WASHINGTON—The United Steelworkers has filed a complaint with the U.S. Court of International Trade seeking judicial review of the U.S. International Trade Commission's recent negative determination in the ITC's investigation of truck and bus tires from China. $WASHINGTON—The United Steelworkers has filed a complaint with the U.S. Court of International Trade seeking judicial review of the U.S. International Trade Commission's recent negative determination in the ITC's investigation of truck and bus tires from China.
Apollo celebrates milestone event
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GYONGYOSHALASZ, Hungary—In a country filled with relics and buildings that date back several centuries, one of the world's most technologically advanced and environmentally efficient...
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GYONGYOSHALASZ, Hungary—Now that Apollo has christened its newest tire plant in Gyongyoshalasz, it can turn its attention to bolstering its presence in the North American market, specifically the U.S. and Canada. GYONGYOSHALASZ, Hungary—Now that Apollo has christened its newest tire plant in Gyongyoshalasz, it can turn its attention to bolstering its presence in the North American market, specifically the U.S. and Canada. $GYONGYOSHALASZ, Hungary—Now that Apollo has christened its newest tire plant in Gyongyoshalasz, it can turn its attention to bolstering its presence in the North American market, specifically the U.S. and Canada.
Bridgestone develops airless bicycle tires
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TOKYO—Bridgestone Corp., together with Bridgestone Cycle Co., Ltd., has developed an airless bicycle tire as part of its "air free concept" technology, the Japanese tire-maker announced...
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TOKYO—Bridgestone, in partnership with Bridgestone Cycle, has developed an airless bicycle tire as part of its "air free concept" technology. TOKYO—Bridgestone, in partnership with Bridgestone Cycle, has developed an airless bicycle tire as part of its "air free concept" technology. $TOKYO—Bridgestone, in partnership with Bridgestone Cycle, has developed an airless bicycle tire as part of its "air free concept" technology.
Digital Edition
Digital Edition
Published on January 1, 2007

Flash Free Molding and Reduced Cycle Time by Using In-Mold Rheological Control Systems

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Date Published January 1, 2007
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This Report has been authored by:David M.c Rose at Beaumont Technologies Inc.

Many common production problems result because of non-uniform viscosities that naturally develop through the cross-sections of the runner system as rubber flows from the injection molding machine through the mold. These non-uniform material properties create many problems for molders including excessive flash on the cavities first to fill as well as a significant disparity in cure rates between cavity groups. Therefore, to maximize the efficiency of an injection mold and to minimize post-molding labor, it is imperative to control the material properties as the rubber flows from the injection molding machine through the mold. This cannot be accomplished at the injection molding machine because, during filling and packing, the machine control is limited to linear speed control of the advancing plunger or screw. Consequently, the machine has limited influence on the material properties and limited control on pressure development within each cavity. However, these non-uniform material properties can be controlled within the mold's runner system and evenly, or otherwise, distributed within the mold cavities by implementing in-mold rheological control systems. Controlling the material conditions can eliminate flash, reduce the cure time difference between cavities, improve part quality, and widen the process window to ensure the mold runs at peak manufacturing efficiencies. This paper will explain why non-uniform material properties develop as it flows and how patented rheological control systems work, explaining the various types of systems and discussing the many benefits of implementing these systems into a mold's runner system so that balanced material properties are delivered to each cavity, controlling the melt property distribution within the cavities. 
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