How to choose a injection machine?

Posted by TINA at 29.04.2019
Before you want buy a injection machine, you should know something first. We know, purchasing an injection molding machine is not a small investment, buying a too big machine is waste of money, while the machine too small is not suitable. So choosing a injection machine suitable for products is the most important thing for a buyer, and the supplier suggests the suitable machine and advise how to choose machine is the first lesson the supplier provides to the buyer.

In order to understand the various procedures for selecting injection molding machines in a more systematic way, the following contents and detailed descriptions is for this purpose.

Too choose a machine,only take injection shot into consideration is too simple,and only based on clamping force is also not comprehensive,so we need combine both and make the choice.

Determine the injection weight of IMM.

It is the most useful and key parameter on choosing a machine. It is expressed by gram or ounze, Although this parameter is simple and easy to understand, it is also easily misunderstood.The reason is very simple. When the plastic material is sure, the weight of the plastic parts can be determined. Therefore, it is easy for them to use the injection weight to choose the machine.In fact, the definition of injection weight refers to the maximum plastic injection weight that can be reached by the injection device when the screw makes a maximum injection stroke under the condition of empty injection (not inject to mold); this parameter reflects to some extent the processing capability of the injection molding machine; it can be measured and can also be from theoretical calculation(the theoretical value and the measured value mayl have a certain degree of difference).The material used for the test is usually a normal PS with a density of 1.05.

There are 4 Steps to determine injection weight

1, first calculate the weight of the product: W = product weight + gate system weight, in which: W the weight required for injection.In the LOG company's product brochure, all actual injection volume parameters are calculated by using polystyrene (PS) as an example, so in actual situations, it is also considered in two cases.

2. When the injection molding product is polystyrene (PS), injection molding machine should have an injection volume of Wps; Wps = (1.3 ~ 1.1) × W (product weight + total weight of the gate system), when there is a high requirement for product, the coefficient in the above equation should take a large value, and vice versa, it can take a small value.

3.  when the product is other plastic (named X plastic) to imitate the method, first calculate the theoretical injection volume of the plastic should have the Wx; Wx = (1.3 ~ 1.1) × (product weight + gate system total Weight); then based on the density of the plastic (X) is converted into the actual weight of the PS material Wps, the conversion formula is:Wps=Wx × 1.05/Vx

4.  according to the calculation results of Wps and LOG brochure, choose the right injection molding machine.

Otherwise, you should pay attention to the energy sonsumption of the injection machine, it can makes your cost low, maybe our ECO series PET preform injection molding machine is suitable for you, it is the best seller machine in my factory, also with much competitive in the market.

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