Hot Runner Preform Mould Simple Structure To Speed Up The Molding Speed
Hot Runner Preform Mould, in the 90's gradually into the Chinese market, but the current application of the overall proportion of less than 20%, while the foreign hot runner has accounted for more than half of injection molds. With the rapid development of domestic hot runner, the domestic market demand is very large.
The so-called hot runner mold refers to a conventional structure in which the flow path of a conventional injection mold or a three-plate injection mold is replaced with a flow path in a constant-temperature heating state, so that a new structure of the flow path material is not required at each molding.
In the molding of large pieces of plastic products, only the use of hot runner in order to make plastic flow balance. For example, in the production of automotive liner, home appliances and other parts of the shell, the need for more at the same time into the glue or in time order into the glue, this time, you need hot runner to complete this step. In addition, in the center of the injection molding machine from the center into the glue, the use of hot runner into the glue method can make the mold structure is simple, while making the molding easier, speed up the molding speed, reducing the molding time, The
In general, the use of three-plate injection method, the heavy mother template to slide on the guide column, even if the new mold is difficult to bear the long-term burden caused by such a slide, so die life is not long. In addition, in this manner, the amount of movement of the template for removing the flow path material from the mold is greater than the amount of template movement required to take out the molded article from the mold.
Hot Runner Preform Mould is an advanced technology used in the plastic injection mold pouring runner system, which is a hot direction for the development of plastic injection molding process. The so-called hot runner molding refers to the plastic from the injection nozzle to the gate of the plastic is always kept in the molten state, each time in the mold does not need to cure as waste removal, retention in the casting system of the melt can be injected at the time of injection Cavity.
The ideal injection molding system should form a uniform density of components, free from all flow paths, burrs and gates. Relatively cold runner, the hot runner to do this, it is necessary to maintain the material in the hot runner of the molten state, will not be sent with the forming parts. The hot runner process is sometimes referred to as a thermal manifold system, or no runner molding. Basically, the thermal manifold can be regarded as an extension of the barrel and the nozzle of the injection molding machine. The function of the hot runner system is to send the material to each gate of the mold.
Hot runner mold design after the need to put into the injection molding machine production, the choice of injection molding machine is also very important. All the automatic circulation capacity of the injection molding machine should be applied to the hot runner system. In the choice of injection molding machine with the following factors need to consider:
(1) hot runner mold due to the increase in the hot runner, more than the block flow path board, so the corresponding increase in the thickness of the mold, select the injection molding machine to pay attention to the installation of injection molding machine height.
(2) injection molding machine injection volume measurement, to take into account the large volume of flow in the plastic compression.
(3) for the hot runner mold depreciation, to promote the continuous operation of the injection molding machine, with multi-level start to reduce the bad.
Many devices are used to ensure the automatic operation of the mold, the preferred robot or simple and controllable manipulator, such as:
(1) the product needs to be placed in the mold, label or sheet to the mold.
(2) Remove the plastic parts or accelerate them out.
(3) control the movement of plastic parts and reduce the start time accessories.
(4) heating the mold before starting the injection molding machine.
(5) to reduce the time on the mold, reducing the cooling water pipes, air, circuit and hot runner temperature control box connection time.