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ITC unanimously finds material injury in China rubber band case
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WASHINGTON—By a 5-0 vote, the U.S. International Trade Commission has made a final determination of material injury to U.S. rubber band makers because of imports from China.The ITC's Dec....
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WASHINGTON—By a 5-0 vote, the U.S. International Trade Commission has made a final determination of material injury to U.S. rubber band makers because of imports from China. WASHINGTON—By a 5-0 vote, the U.S. International Trade Commission has made a final determination of material injury to U.S. rubber band makers because of imports from China. $WASHINGTON—By a 5-0 vote, the U.S. International Trade Commission has made a final determination of material injury to U.S. rubber band makers because of imports from China.
Year in Review: Non-tire firms restructure, expand operations
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Parker Hannifin wasn't the only one restructuring on the non-tire rubber products side. The firm combined its industrial and hydraulic hose businesses into one division, effective July...
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Two of the industry's biggest, non-tire rubber product makers restructured in 2018, while plenty of others embarked on expansions and new deals. We look back at some of the year's key moments. Two of the industry's biggest, non-tire rubber product makers restructured in 2018, while plenty of others embarked on expansions and new deals. We look back at some of the year's key moments. $Two of the industry's biggest, non-tire rubber product makers restructured in 2018, while plenty of others embarked on expansions and new deals. We look back at some of the year's key moments.
As California's autonomous vehicle population doubles, so do crashes
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In the beginning, self-driving vehicles could be spotted only on the streets near Silicon Valley tech companies whose work made them possible. Now they're much more widespread.Autonomous vehicle...
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In the beginning, self-driving vehicles could be spotted only on the streets near Silicon Valley tech companies whose work made them possible. Now they're much more widespread. In the beginning, self-driving vehicles could be spotted only on the streets near Silicon Valley tech companies whose work made them possible. Now they're much more widespread. $In the beginning, self-driving vehicles could be spotted only on the streets near Silicon Valley tech companies whose work made them possible. Now they're much more widespread.
Editorial: Priorities guide William Stockwell's path for family business
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William Stockwell is one who has always had his priorities in order. During his four decades at his family's firm, he often has opted to make the tough choices. It's for that type of leadership...
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William Stockwell is one who has always had his priorities in order. During his four decades at his family's firm, he often has opted to make the tough choices. William Stockwell is one who has always had his priorities in order. During his four decades at his family's firm, he often has opted to make the tough choices. $ William Stockwell is one who has always had his priorities in order. During his four decades at his family's firm, he often has opted to make the tough choices.
Cooper Tire, Sailun to form joint venture, build truck, bus tire plant
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FINDLAY, Ohio—Cooper Tire & Rubber Co. and Sailun Vietnam Co. Ltd. have agreed to set up a joint venture to oversee the construction of a radial truck/bus tire plant in Vietnam rated at ...
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FINDLAY, Ohio—Cooper Tire and Sailun Vietnam have agreed to set up a joint venture to oversee the construction of a radial truck and bus tire plant in Vietnam rated at more than 2 million units annually. FINDLAY, Ohio—Cooper Tire and Sailun Vietnam have agreed to set up a joint venture to oversee the construction of a radial truck and bus tire plant in Vietnam rated at more than 2 million units annually. $FINDLAY, Ohio—Cooper Tire and Sailun Vietnam have agreed to set up a joint venture to oversee the construction of a radial truck and bus tire plant in Vietnam rated at more than 2 million units annually.
Executive of the Year: Knowledge of business, industry sets William Stockwell apart
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PHILADELPHIA—When Jerry Krummel attended a trade show meeting with Stockwell Elastomerics Inc., he expected to discuss silicone supply in the upcoming year. What the sales director for...
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PHILADELPHIA—William Stockwell's sense and hands-on attitude are a few of the reasons why he was chosen as the Rubber & Plastics News 2018 Rubber Industry Executive of the Year. PHILADELPHIA—William Stockwell's sense and hands-on attitude are a few of the reasons why he was chosen as the Rubber & Plastics News 2018 Rubber Industry Executive of the Year. $PHILADELPHIA—William Stockwell's sense and hands-on attitude are a few of the reasons why he was chosen as the Rubber & Plastics News 2018 Rubber Industry Executive of the Year.
Nokian opens North American headquarters in Nashville
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NASHVILLE, Tenn.—Nokian Tyres P.L.C. has opened its North American headquarters office in Nashville, housing the company's sales, customer service, IT, logistics and marketing teams. As...
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NASHVILLE, Tenn.—Nokian has opened its North American headquarters office in Nashville, housing the company's sales, customer service, IT, logistics and marketing teams. NASHVILLE, Tenn.—Nokian has opened its North American headquarters office in Nashville, housing the company's sales, customer service, IT, logistics and marketing teams. $NASHVILLE, Tenn.—Nokian has opened its North American headquarters office in Nashville, housing the company's sales, customer service, IT, logistics and marketing teams.
NIBA president looks to keep the course
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PHOENIX—Brian Schachner, NIBA's new president, wants to help the association stay steady on a path of growth established by prior leadership. "My goal is mainly to maintain the direction...
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PHOENIX—Brian Schachner, NIBA's new president, wants to help the association stay steady on a path of growth established by prior leadership. PHOENIX—Brian Schachner, NIBA's new president, wants to help the association stay steady on a path of growth established by prior leadership. $ PHOENIX—Brian Schachner, NIBA's new president, wants to help the association stay steady on a path of growth established by prior leadership.
Executive of the Year: Philadelphia group seeks to provide road for ex-offenders
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Often times, the people who need a second chance don't get it. Fortunately, William Stockwell believes in second chances. The president of Philadelphia-based Stockwell Elastomerics Inc....
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Often times, the people who need a second chance don't get it. Fortunately, William Stockwell believes in second chances. Often times, the people who need a second chance don't get it. Fortunately, William Stockwell believes in second chances. $Often times, the people who need a second chance don't get it. Fortunately, William Stockwell believes in second chances.
Executive of the Year: William Stockwell makes lasting impact on his family's company, employees
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William Stockwell always wanted to follow his own path. Oddly enough, embracing the same family legacy he initially felt would prevent him from forging his own identity has allowed him to do just...
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William Stockwell always wanted to follow his own path. Oddly enough, embracing the same family legacy he initially felt would prevent him from forging his own identity has allowed him to do just that. William Stockwell always wanted to follow his own path. Oddly enough, embracing the same family legacy he initially felt would prevent him from forging his own identity has allowed him to do just that. $ William Stockwell always wanted to follow his own path. Oddly enough, embracing the same family legacy he initially felt would prevent him from forging his own identity has allowed him to do just that.
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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