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Dongguan HongS Jingyan Hot Runner Technology Co., Ltd.
Shenzhen HongS Hot Runner Technology Co., Ltd.
Jiangxi HongS Mould Co., Ltd.

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AddressPeasant Industrial Zone, Tianwei, Fenggang Town, Dongguan City, Guangdong Province

Company news HOME >> News >> Company news

What is a hot runner - the fourth chapter
Issuing Time:2018-09-01

concept of design


An important step in the hot runner is the design concept of the hot runner. A detailed design concept, including manifolds and platens, will be an important part of the mold review.


Manifolds are used to ensure that the melt channels are arranged in the most efficient manner. Ideally, the melt channels are designed in a symmetrical manner, and the flow length of all downstream channels is consistent with the number of turns. Where a multi-cavity mold or an asymmetric mold is employed, the melt channel may include artificial lengths and turning points to enable proper balancing of the system. This concept is helpful to designers and hot runner designers to ensure optimal manifold design.


In a part that requires three injection ports, in order to control the seam line on the part, it is necessary to solve the problem of plastic flow balance. Through a detailed manifold design, the balance of the flow and the arrangement of the manifold can be evaluated to ensure that the downstream runner can meet the needs of the customer's mold base. The end result is a combination of a single direct injection port and two hot to cold injection ports on a single cavity mold (Figure 3).


In addition, the use of platen technology to ensure that the customer's required closing height and key features can be designed. Since the hot runner nozzle is included in the nozzle, the mold designer also confirms that the proximity of the injection port and the cooling meet the requirements of the hot runner manufacturer.


The main factors for hot runner evaluation include: flow balance and manifold heat distribution; channel size; tube material strength in high pressure applications; inlet size; cooling and inlet proximity; ability to withstand abrasiveness and corrosion The composition of the resin.


The hot runner is a complex and advantageous mold part. In mold production projects, CAE computer-aided engineering analysis, resin testing, and design concepts can all be performed by hot runner suppliers. At the beginning of a project, if hot runner suppliers are involved, the designer can further optimize the final product.


Direction of development


At present, the main development trends of hot runner molds at home and abroad can be summarized as the following aspects.


Miniaturization of components to achieve multi-cavity and multi-gate filling of small products. By reducing the nozzle space, more cavities can be placed on the mold to increase product yield and injector utilization. In the 1990s, Master developed nozzles as small as 15.875mm; Husky's multi-gate nozzles, each nozzle has 4 gates, and the gate distance can be as close as 9.067mm; the combined compound nozzle developed by Osco Each nozzle has 12 gate probes that can be used to mold 48-cavity molds. MoldMaters developed space-saving nozzles for small parts in 2001, including integral heaters, tips and melt channels, volumetric diameters of less than 9 mm, gate distances of only 10 mm, and formable weights. 1~30g products; mini hot runner system developed by Xieli Hot Runner Co., Ltd., with a gate distance of nearly 8.00mm, especially suitable for smaller electronic products.


At present, users require mold design and manufacturing cycle to be shorter and shorter. Standardizing hot runner components not only helps to reduce the duplication of design work and reduce the cost of molds, but also facilitates the replacement and repair of vulnerable parts. According to reports, Polyshot has developed a fast heat exchange runner mold system, especially for small injection machines with a injection pressure of 70kN. The nozzles, stems and manifolds of companies such as Husky, Presto and Moldmasters are standard as they are quick to change and deliver the molds. It takes only 4 weeks to deliver the molds abroad, and the hot runner molds can be delivered in the fastest 2 weeks. .


The overall reliability of the hot runner mold design is improved. Nowadays, major mold companies at home and abroad attach great importance to the research on the design of hot runner plates and the pressure distribution, temperature distribution and sealing of the joints of hot nozzles. The development and utilization of laminated hot runner injection molds is also a hot spot. The stacking mold can effectively increase the number of cavities, and the injection molding force requirement of the injection machine only needs to increase by 10% to 15%. Stacked hot runner molds have been used in industrialization in some developed countries. Stacked hot runner molds have been widely used in the domestic injection molding industry, such as disposable tableware, bottle caps, bottle caps and handles, etc. Products. For example, the domestic cooperative hot runner company has accumulated rich experience in the design and production of stacked hot runners.


The purpose of improving the material of the hot runner element is to improve the wear resistance of the nozzle and the hot runner and to shape the sensitive material. If a nozzle is made using a tough alloy material such as molybdenum and titanium, it has become possible to form a hot runner element by injection molding of metal powder.


Develop precise temperature control systems. In hot runner mold molding, the development of more precise temperature control devices, controlling the temperature of the molten resin in the hot runner plates and gates is an effective measure to prevent thermal degradation of the resin and degradation of product performance.


The hot runner is used for co-injection. Through the effective combination design of the branch pipe and the hot nozzle element, the co-injection molding can be combined with the hot runner technology, thereby forming a composite plastic article of 3 layers, 5 layers or even more layers. For example, Kortec has developed melt delivery systems and co-injection nozzles; Incoe's multi-outlet, multi-cavity co-injection pipe production line can be used for multi-material multi-component co-injection.