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Analysis of advantages and disadvantages of hot runner mould
Aug 29, 2017

Analysis of the advantages and disadvantages of hot runner mould:

In our country vigorously popularize hot runner mold, we must correctly understand the advantages and disadvantages of hot runner mold, to ensure that the plastic parts to achieve low-cost, high-efficiency production.

1. Advantages

1 The pouring system of materials, energy and labor is a large proportion of material consumption. The use of these materials two times, so that after crushing, extrusion, cutting after mixing fresh plastic parts, easy to bring into foreign bodies caused by pollution, so that two molding of the plastic parts performance reduced.

2 improve the quality of plastic parts using hot runner system, in the cavity temperature and pressure is more uniform, plastic parts stress Small, uniform density.

3 shorten the molding cycle using hot runner mold no condensate, do not need to use sanbanxi die, so that the required open and closed die travel reduction. The process of removing the gate during injection molding is omitted, which simplifies the operation and is advantageous to realize the automatic production.

4 Reduce the energy loss to the minimum heat flow temperature and injector nozzle temperature is equal to avoid the raw materials in the flow of the surface condensation phenomenon, thereby reducing the injection molding machine temperature and pressure debugging.

5 Automated production safety without ordinary flow, injection molding can be achieved by automation. The nozzle adopts the standard, seriation design, with a variety of alternative nozzles, with good interchangeability.

2. Shortcomings

Hot Runner mold with the above advantages, but the heat runner mold fittings complex structure, strict temperature control requirements, the need for precision temperature control system, high cost, not suitable for small batch production. The main points are summarized as follows:

1 overall mold closed height increase due to the addition of hot runner plate, the overall height of the mold has increased, need to choose a larger stroke injection molding machine.

2 heat loss is difficult to control hot runner The biggest problem is the thermal nozzle and heat runner plate heat loss, is a major problem to be solved.

3 existence of thermal expansion and contraction is a problem that needs to be considered closely in the design

4 Mold manufacturing costs increase the hot runner mold standard parts price is higher, manufacturing difficult.



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