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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

Problem HOME >> News >> Problem

Hot runner system selection and matters to be aware of when purchasing
Issuing Time:2018-09-01

The hot runner system is a relatively complex technology in the field of injection molding. There are many issues that need to be considered when mold design manufacturers and mold users choose and purchase hot runner systems.


A hot runner supplier's choice


When designing a hot runner mold, the mold manufacturing company does not simply go to the hot runner supplier to buy a hot runner system and put it on the mold. In fact, between the mold manufacturing company and the hot runner supplier, from the conceptual design stage of the hot runner mold to the actual manufacturing process of the mold, to the final use of the mold, there are many meticulous technical and commercial aspects. Coordination and cooperation. Therefore, mold manufacturing companies and mold users should choose hot runner suppliers. When selecting a hot runner supplier, it is important to examine two basic aspects, one is the quantity and quality of the hot runner components produced by the hot runner supplier, and the other is the technical support of the hot runner supplier in the region where the mold user is located. With after sales service.


  1. Number and quality of hot runner components


The hot runner system has three types: hot tip (HOT TIP), SPRUE GATING and VALVE GATING. In fact, in each type, it can be subdivided into many product lines. For example, the diameter of the runner cross section in the hot tip nozzle (NOZZLE) can often vary from 4 mm to 12 mm, and the nozzle is also made into a product series of different sizes. There are also many variations of nozzle gate inserts to meet different application requirements. Therefore, the product line of the hot runner supplier to be selected is as rich as possible. In this way, the user can have greater selectivity of the hot runner components, the types of plastic parts produced by the hot runners, the size, weight and application range are wider, which is more conducive to optimizing the injection molding process and improving product quality.


When injection molding plastic products, the hot runner system and the hot runner mold are under high temperature and high pressure dynamic load conditions.


  work. There are many factors that cause the failure of the hot runner system components. And injection molding processing is mainly used in the production of large quantities of plastic parts. Once there is any shutdown, the economic losses are very serious. Therefore, the quality and reliability of the hot runner system is very important. Customers should go deep into the quality and application history of hot runner components produced by hot runner suppliers. Some of the better hot runner manufacturers have been certified by international organizations as ISO quality standards.


  2. Technical support and after sales service


When using the hot runner mold, in addition to the reliable hot runner system, the user should consider any problem in the hot runner, whether it can get timely and effective technical support and after-sales service. Many hot runner suppliers have a strong technical support and service network in the countries and regions where their company headquarters are located, and are equipped with full-time service personnel who can access customers for troubleshooting at any time. However, in other countries and regions that are far away from their company headquarters, these manufacturers often only set up offices that focus on the sales of hot runner products. Technical support is relatively inferior. Users should pay attention to this factor.


2. Several technical issues when selecting and purchasing a hot runner system


Users will involve many specific technical aspects when selecting and purchasing hot runner systems. If the user has a good technical knowledge related to the hot runner, it is easy to select and purchase the most suitable hot runner system to ensure smooth injection molding process and improve product quality.


  1. The right choice for the hot runner product range


Hot runner suppliers often make their hot runner components into a product line, depending on the size and weight of the finished part. For example, large plastic parts are processed using large-sized nozzles, and small plastic parts are processed with small-sized nozzles. Therefore, after the user selects the hot runner type correctly (whether it is a hot tip or a valve system), it is the choice of the hot runner product line. And thus determine the structural size and design of the mold. If the hot runner product line is not selected correctly, it will be discovered in the later stages of mold processing or in the production of plastic parts. The error is very serious and difficult to save. To help you properly select the hot runner product line, each hot runner supplier has some instructive technical documentation for reference. Users should work closely with hot runner suppliers to select a hot runner product line.


  2. Injection pressure loss in hot runner systems


Injection pressure loss in hot runner systems cannot be ignored. Many hot runner mold users have a misconception that both cold flow


Compared to the road, the injection pressure loss of the hot runner is much smaller. The reason is that the plastic solution located in the hot runner is always hot throughout the injection molding process. In fact, many times the situation is just the opposite. In the hot runner mold, due to the design of the hot runner structure, the flow distance of the solution in the hot runner system is greatly increased. Therefore, the injection pressure loss in the hot runner system is also often large. In practical applications, there are many cases in which injection molding is difficult due to excessive injection pressure loss in the hot runner system. Therefore, for processing plastics with poor fluidity (such as PC, POM, etc.), the flow distance of the solution in the hot runner system is large, or the weight of the workpiece is large, CAE software should be used for flow channel analysis and calculation. The CAE software that focuses on the flow path analysis calculation has MoldCAE and the like.


3. Standard and non-standard hot runner systems


Both hot runner manufacturers offer both standard and non-standard hot runner systems. If possible, users should try to choose the standard


Hot runner system. Try to select the nozzles, hot runner plates, gate inserts, etc. of the standard length and size. The advantage is that the standard hot runner system is less expensive than the non-standard hot runner system and the delivery time is much shorter. And the parts are interchangeable, which is conducive to future use and maintenance. Once a part is broken, buy another standard part and install it. Common standard hot runner plates have a shape of 2 chambers and columns, 4 chambers and columns, 8 chambers and columns, 4 chambers X shape, 8 chambers XX shape, and the like.


4. The number of cavities on the mold and the choice of layout


When designing the hot runner mold to select the number of cavities, in addition to increasing the production efficiency of the cavity as much as possible, the heat should also be considered.


The design problem of the runner. The choice of the number of cavities on the mold and the layout should be beneficial to the flow balance of the plastic solution in the hot runner system. For example, if several shaped cavities are arranged in a row, it is better to select the number of cavities as