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On October 29, with Secretary-General Yang Gang of the Liaoning Rubber Association serving as witness, Dalian Bohai Rubber & Plastics Co., Ltd. and Shenyang University of Chemical Technology officially inaugurated their jointly established “Undergraduate Practical Teaching Base” and “Joint Innovation Research Center for Rubber and Plastics Materials.” This collaboration marks a substantive step forward for both parties in integrating industry and education and fostering collaborative talent development, injecting new momentum into technological innovation and workforce training within the rubber and plastics materials sector.
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This manual is intended to provide rubber product manufacturers with a rigorous, practical quality‑control framework, ensuring that all finished products comply with national safety, environmental, and market‑access requirements, preventing nonconforming items from entering downstream stages, and safeguarding consumers’ life and property. Article 1 of this manual explicitly stipulates that the production of all rubber products must strictly adhere to the process‑control checkpoints outlined herein; any deviation from the standard operating procedures (SOP) at any stage of production shall be deemed a violation and will result in the product being classified as nonconforming.
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In-depth Analysis of the Vulcanized Adhesion Between Rubber and Metal
Vulcanized bonding between rubber and metal is a complex yet critical technology, widely employed in industries such as automotive, aerospace, machinery, and medical devices. Through the vulcanization process, rubber and metal can be firmly joined, combining their respective advantages—such as rubber’s elasticity and vibration‑damping properties with metal’s high strength and rigidity—thereby enhancing the material’s overall performance. This paper provides an in-depth examination of rubber–metal vulcanized bonding, covering its underlying principles, methods, applications, and associated challenges.
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Classification of Automotive Rubber Products
Automotive rubber products constitute a highly important category of auto parts. Though often overlooked, they play an indispensable role in sealing, vibration damping, noise reduction, and mechanical connections within vehicles.
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Recently, Dalian Bohai Rubber & Plastics Co., Ltd. has continued to ramp up its fixed‑asset investment, launching an intelligent upgrade project for production and quality‑inspection equipment. This initiative further strengthens the company’s capabilities in manufacturing precision rubber products and comprehensively enhances both the production capacity and quality‑control standards of rubber sealing products such as O‑rings.
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Causes of Mold Adhesion During Rubber Molding and Their Solutions
After vulcanization, molded rubber products often adhere to the mold and are difficult to demold, which is one of the most challenging issues in rubber processing and directly affects product quality, appearance, and production efficiency. This paper systematically analyzes the causes and mechanisms of mold sticking from multiple perspectives, including hydrogen‑bonding adsorption of surface hydroxyl groups on white fillers (precipitated silica), under‑vulcanization, excessive use of resins, adhesives, or metal salts in the compound, mold‑related factors, as well as the vulcanization system and process parameters. Drawing on both domestic and international literature and industry practice, the study proposes comprehensive solutions, such as formulation optimization, mold treatment, process adjustments, and the application of release agents.
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