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New hot runner technology

ABIS Mold Technology Co.,Ltd Updated: Oct 16, 2018

                           New hot runner technology

   Ideal injection molding systems form density-consistent components that are not affected by all flow paths, flyovers, and watering mouths.In contrast to the cold flow channel, the hot flow channel must maintain the molten state of the material in the hot flow channel and will not be sent out with the formed part.Heat flow process is sometimes referred to as a heat collector system, or non - flow molding.

   Basically, the hot header can be viewed as an extension of the cylinder and the nozzle of the molding machine.The role of the heat flow system is to deliver the material to each gate in the mold.

   There are two types of hot runner systems.

   An insulated flow channel mold has a large flow channel made up of formwork.The channel is not heated, but the size of the channel should be large enough to maintain the flow of the melt in the channel by combining with the heat generated by each injection with the effect of heat insulation provided by the plastic condensing on the channel wall under operating conditions.

   The system is older and simpler in both categories, with the advantage of less complex design and low manufacturing costs.The disadvantage is that sometimes there is condensation in the gate;In order to maintain the molten state, a quick working cycle is required.It takes a long time to prepare for a stable melting temperature.Another major problem is that it is difficult to achieve injection consistency, or no guarantee.Also because there is no heating in the system, high injection pressure is required, which often causes the cavity plate to deform or bend.

   There are two designs for the hot runner system.

   The inner heating channel is characterized by using the inner heating annular channel.Heating is provided by a probe in the flow path and a heating shuttle (also known as an distributor).The system USES the insulating effect of the molten plastic to reduce heat transfer and losses elsewhere in the mold.

   Despite the annular heater inside the dispenser tube, there is material condensation between the heating shuttle and the wall of the runner.The material must flow continuously between the insulating wall and the heating shuttle, which, combined with the annual flow effect, causes pressure to drop in the system, so the importance of balance is critical.

   Taking this problem into consideration, the internal heating system is most suitable for the material with large processing range and the balanced runner with equal distance to each landing port.This system is not suitable for use of heat sensitive resin.

   Internal heating provides improved heat distribution relative to the thermal insulation system, but the system is more costly and complex in design.This system requires careful balance and complex thermal control.

   Another design for hot runner is an external heating system.The design consists of a annular heating collector with an internal flow channel.The collector pipe is designed with a variety of insulation structures isolated from other parts of the die.The advantage of this system is better temperature control, but the cost is also relatively high and the equipment is complex.

   The latest technological developments have reduced the size of the collector pipe and made installation easier.External heating systems can also be balanced by diameter, rather than by length.

   New products seem to come out every month, but manufacturers and suppliers of hot runner are not usually mold makers.This article is designed to introduce readers to some of the latest technologies and most innovative applications, opening the door to the necessary discussions with mold makers, hot runner suppliers, tool makers, and resin manufacturers.

   Mold - Masters company

   The Canadian company is a giant in the industry.The company recently launched a new component for temp-master TMMZ multizone temperature controllers.This component device is used for high pressure collecting pipes.This component provides superior reliability and can withstand much higher current than the current standard QMOD model of 15 amps per zone.

   Engineers at mold-masters say they are mindful of the need for large converters that often have more than the current 15 ampere-capacity controllers in each area, which led to the design of new circuit boards.The components of the new circuit board can bear a larger current load.The components have a serial bus control structure and can be configured from any motherboard.The user can connect to a larger current collector from any configuration.

   Before the new components were rolled out, the options available for handling larger currents in each region were rather limited.The manufacturer can use an independent power switch device on the main processor board to control the external tri-end bi-directional thyristor switch, thus isolating the high and low voltage from the direct interface.You can also add a solid state relay to increase the output current.

   Temp-master TMMZ 30a-mod includes two options in the design of a board, with each board having the ability to handle two zones.

   The temp-master TMMZ controller was originally launched at K 2001, and now has three models: 24, 84 or 160 zones, each with a load capacity of 16 amps.The controller is 60 percent higher than the usual 10 amps.

   The controller is a modular structure with advanced touch screen technology, including pointing and setting control module, touching and rotating 3d charts and page selectors.The controller can be remotely operated and maintained.

   Husky company

   Canada's injection-molding giant is now determined to make a bigger splash in the hot runner market.Husky's continued investment in development adds to the original product line.

   The new "" supernozzle" "series ranges in size from 0.25 inches (0.6 cm) to 1 inch (2.4 cm).These nozzles use the same ejection fixings, heater and thermocouple installation, and valve stem drive.The eight-gate approach can be used to meet the engineering and commercial requirements of the resin.A steel ejector hold is used to ensure a reliable, solid seal between the nozzle and the gate insert.The valve gate system is designed by the company's UntraGuide valve system to ensure gate quality and device life by using cylinder closure.

   In the whole structure of UltraSeal leak proof technology has been adopted, the nozzle with a spring preload on the current collector, provide the working range of + / - 100 ° C.Husky has a series of warranty plans, including heater, thermocouple and ejector for three years of containment.

   The UntraGuide valve gate technology of Husky was designed to complement the cylinder valve gate, which soon became an industry standard.In most applications, cylindrical valve gate supply is considered to provide a better quality of sprue.Wear of the valve stem or gate hole can quickly damage the quality of the gate, forming a coronal flanging around the valve stem cycle.

   Husky is expanding its offerings with an existing single hole hot runner series.Hot direct injection and single-chamber valve sprays can be configured with any standard "supernozzle" sprue method and housing length, providing greater flexibility.Compared with the application of cold runner, the single gate hot runner using heat or valve gate has the advantages of improving cycle time and reducing resin consumption.


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