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Successful research on hot runner system for long glass fiber injection molding
The stability of long glass fiber structures improves as the fiber length increases, with each additional millimeter contributing to greater structural integrity. This is why Germany's Synventive Injection Molding Industry has developed an innovative valve needle cylinder for its hot runner system. Featuring a large stroke and optimized flow path, this design helps maintain longer fiber lengths compared to traditional molds. As a result, the final product exhibits enhanced strength, impact resistance, and dimensional stability.
Beyond conventional glass fiber granules and spheres, filament yarn compounding companies are increasingly adopting long fibers to improve product performance. The metering device plays a critical role in fiber shortening, so injection molding manufacturers must focus on preserving fiber length. Additionally, the gate is a key stress point for both the hot nozzle and raw material. Larger gates, rounded corners, and flow paths that don’t interfere with the valve stem can reduce pressure and shear stress, ensuring better protection of the fiber material.
These features are just some of the many benefits offered by Synventive’s new HYC 4018 and PNC 7518 (hydraulic/pneumatic drive) systems. Another significant advantage is the extended service life of the valve needle and hot nozzle, along with an increased number of injection cycles. Synventive’s efforts to maximize fiber length per millimeter provide injection molders and manufacturers with substantial overall benefits, such as reduced shrinkage and warpage, improved fluidity, lower anisotropy, and decreased linear thermal expansion.
Moreover, the reduction in surface thickness not only makes products lighter but also shortens cooling times during manufacturing, boosting productivity. The new valve needle cylinders come with a range of advanced features, including adjustable stem height, lockable and externally adjustable valve stems, patented valve needle bushings with effective cooling, and cylinder coupling technology. These innovations make the HYC 4018 ideal for use in industries such as automotive, household appliances, and electrical installations.
Synventive is one of the leading global manufacturers of hot runner systems, machine nozzles, temperature controllers, and sprue bushings for the injection molding industry. Its production facility in China is located in Suzhou, supporting the company’s commitment to quality and innovation worldwide.