Haochen20 years of focus on multimode cavities and small spacing hot runner

The splitter plate mainly consists of three parts: heating system, temperature sensing system, and flow channel system.

There are two ways to use a heater, one is through a heating rod, and the other is through a heating coil. At present, it is still the mainstream heating coil structure, and the main Taiwanese brands of heating rods used to be the majority. The arrangement of heating coils is definitely a knowledge, and for multi chamber systems, the arrangement of heating wires has a significant impact on balance; At the same time, for the layout of symmetrical plastic products, heating wire rods are also required to be symmetrical; Simultaneously guide a heating density concept (total heating power of the splitter plate)/The volume of the splitter plate may not be very important for conventional materials, but it must be considered for crystalline materials.

At present, there are several mainstream temperature sensing systems, one is surface probes, and the other is internal probes. In fact, these are all used to measure the actual temperature near the gate of the splitter plate through temperature sensing lines, which are usually set at high heating densities. But for temperature sensitive materials such asPVC, POMIt is recommended to minimize the length of the heater and measure temperature in multiple areas.

In addition to the above two major components, the flow channel system is still quite important. Firstly, the material of the splitter plate is currently mainly stainless steel andP20However, special materials still require special steel (halogen-free materials,PVCMaterials, etc.), the flow channel is generally formed mainly through gun drilling processing, in addition to welding processing. Due to cost and technical reasons, the mainstream is gun drilling, and welding is only considered for special applications (balance requirements, color change requirements, anti-corrosion requirements); Secondly, the diameter of the runner is different for products in different fields, and the mold structure is completely different, so the hot runner runner is also different. The packaging and medical industry requires balance and color change; The automotive industry requires color change and sequence control; The car lamp requires minimal pressure loss; Low pressure injection molding requires low pressure (recommended below40MPa）,In summary, the diameter of the flow channel is selected based on the product technology application.

For the processing of splitter plates, the plug structure is crucial, including welding, interference fit, and screw blockage, which are both large and small. There are also plugs with the same diameter to block the flow channel, so many dead corners are generated in this position. The thickness of the splitter plate is related to the diameter of the flow channel, but it is also related to the quality of the steel (international brands choose Yisheng Bai and other brands, while ordinary ones are made of domestic materials). For machining, the angle between the splitter plate channel and the channel ensures thatsixtyAbove degrees.

In fact, the processing of the splitter plate basically determines the positioning of the product and the positioning of the design ability. So, nail on the board.