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Datwyler opens Delaware plant
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MIDDLETOWN, Del.—The sealing unit of Datwyler Holding A.G. celebrated the grand opening of its new medical manufacturing plant in Middletown. The site represents a $100 million investment,...
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MIDDLETOWN, Del.—The sealing unit of Datwyler Holding celebrated the grand opening of its new medical manufacturing plant in Middletown. MIDDLETOWN, Del.—The sealing unit of Datwyler Holding celebrated the grand opening of its new medical manufacturing plant in Middletown. $MIDDLETOWN, Del.—The sealing unit of Datwyler Holding celebrated the grand opening of its new medical manufacturing plant in Middletown.
Yokohama to combine R&D efforts into new center
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CORNELIUS, N.C.—Yokohama Tire Corp. has opened a new research and development facility in Cornelius, designed to bring together its R&D efforts into one location.Yokohama Development...
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CORNELIUS, N.C.—Yokohama has opened a new research and development facility in Cornelius, designed to bring together its research and development efforts into one location. CORNELIUS, N.C.—Yokohama has opened a new research and development facility in Cornelius, designed to bring together its research and development efforts into one location. $CORNELIUS, N.C.—Yokohama has opened a new research and development facility in Cornelius, designed to bring together its research and development efforts into one location.
Photos: Goodyear tires drive NASCAR tradition
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AKRON—The first thing you sense while you tour the Goodyear Innovation Center Manufacturing facility in Akron is the enormous amount of pride, workmanship and know-how that goes into each of ...
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AKRON—The first thing you sense while you tour the Goodyear Innovation Center Manufacturing facility in Akron is the enormous amount of pride, workmanship and know-how that goes into each of the 4,000-plus racing tires. AKRON—The first thing you sense while you tour the Goodyear Innovation Center Manufacturing facility in Akron is the enormous amount of pride, workmanship and know-how that goes into each of the 4,000-plus racing tires. $AKRON—The first thing you sense while you tour the Goodyear Innovation Center Manufacturing facility in Akron is the enormous amount of pride, workmanship and know-how that goes into each of the 4,000-plus racing tires.
Electrification shaking up rubber auto parts sector
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Electrification is shaking up the automotive parts supply-chain: forcing rubber product companies to add new capabilities to their established areas of expertise in materials science and...
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Electrification is shaking up the automotive parts supply-chain: forcing rubber product companies to add new capabilities to their established areas of expertise in materials science and technology. Electrification is shaking up the automotive parts supply-chain: forcing rubber product companies to add new capabilities to their established areas of expertise in materials science and technology. $Electrification is shaking up the automotive parts supply-chain: forcing rubber product companies to add new capabilities to their established areas of expertise in materials science and technology.
Evonik opens tire silicas plant in South Carolina
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GOOSE CREEK, S.C.—Evonik Industries has inaugurated a precipitated silica plant in South Carolina, aimed at better serving the U.S. tire industry.The $120 million investment comes in...
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GOOSE CREEK, S.C.—Evonik Industries has inaugurated a precipitated silica plant in South Carolina, aimed at better serving the U.S. tire industry. GOOSE CREEK, S.C.—Evonik Industries has inaugurated a precipitated silica plant in South Carolina, aimed at better serving the U.S. tire industry. $GOOSE CREEK, S.C.—Evonik Industries has inaugurated a precipitated silica plant in South Carolina, aimed at better serving the U.S. tire industry.
Long development journey pays off for Tweel, Michelin
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AKRON—For the record, Michelin's Steve Cron isn't a big fan of the name given to the product that has defined much of his 30-year career in the tire industry. That product is the Tweel, the ...
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AKRON—For the record, Michelin's Steve Cron isn't a big fan of the name given to the product that has defined much of his 30-year career in the tire industry. That product is the Tweel, the tire maker's easily recognizable product that combines a non-pneumatic tire with a polyurethane spoked wheel. AKRON—For the record, Michelin's Steve Cron isn't a big fan of the name given to the product that has defined much of his 30-year career in the tire industry. That product is the Tweel, the tire maker's easily recognizable product that combines a non-pneumatic tire with a polyurethane spoked wheel. $AKRON—For the record, Michelin's Steve Cron isn't a big fan of the name given to the product that has defined much of his 30-year career in the tire industry. That product is the Tweel, the tire maker's easily recognizable product that combines a non-pneumatic tire with a polyurethane spoked wheel.
Old Dana taps the fountain of youth
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MAUMEE, Ohio—With little fanfare this year, one of the global auto industry's oldest suppliers began repositioning itself for a business of the future. Dana Inc. has made two key...
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MAUMEE, Ohio—With little fanfare this year, one of the global auto industry's oldest suppliers began repositioning itself for a business of the future. MAUMEE, Ohio—With little fanfare this year, one of the global auto industry's oldest suppliers began repositioning itself for a business of the future. $MAUMEE, Ohio—With little fanfare this year, one of the global auto industry's oldest suppliers began repositioning itself for a business of the future.
Kent Elastomer to expand headquarters
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KENT, Ohio—Kent Elastomer Products Inc. is expanding its headquarters to accommodate its growing work force.The firm broke ground on an extension to the office area of its Kent facility,...
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KENT, Ohio—Kent Elastomer Products is expanding its headquarters to accommodate its growing work force. KENT, Ohio—Kent Elastomer Products is expanding its headquarters to accommodate its growing work force. $KENT, Ohio—Kent Elastomer Products is expanding its headquarters to accommodate its growing work force.
Private equity firm KKR set to acquire Minnesota Rubber & Plastics
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MINNEAPOLIS—Norwest Equity Partners has agreed to sell Quadion L.L.C., which does business as Minnesota Rubber & Plastics, to global investment firm KKR & Co. L.P. Terms of the...
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MINNEAPOLIS—Norwest Equity Partners has agreed to sell Quadion, which does business as Minnesota Rubber & Plastics, to global investment firm KKR. MINNEAPOLIS—Norwest Equity Partners has agreed to sell Quadion, which does business as Minnesota Rubber & Plastics, to global investment firm KKR. $ MINNEAPOLIS—Norwest Equity Partners has agreed to sell Quadion, which does business as Minnesota Rubber & Plastics, to global investment firm KKR.
Video: Miller calls Louisville Rubber Division meeting a success LOUISVILLE, Ky.—This week's ACS Rubber Division's International Elastomer Conference has been a success on all levels, according to Executive Director Ed Miller. LOUISVILLE, Ky.—This week's ACS Rubber Division's International Elastomer Conference has been a success on all levels, according to Executive Director Ed Miller. $LOUISVILLE, Ky.—This week's ACS Rubber Division's International Elastomer Conference has been a success on all levels, according to Executive Director Ed Miller.
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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