How to choose the proper size injection machine?

How to choose the proper size injection machine?

How to choose the proper size injection machine?

  1. Capability of the injection machine could be the first factor that need to be concern. For example, 100 Tons injection machine with 30 mm screw size and 125 mm injection stoke would have the maximum PS injection capability of 79 grams. However, if the material changes to pp, the maximum capability would be 64.4 grams ((79*0.7) / 0.9 = 64.4 grams). The amount do have the assumption of PS density as 0.9 g/cm3 and PP density as 0.7 g/cm3.
  2. The clamping force is the second factor that need to be aware of. Although the machine could be clamp on to the machine with the clamping force. However, some product with thin wall requires higher clamping force in order to keep the mold close and resist the pressure during the operation.
  3. The machine tie bar is another factor that need to be concerned. The mold designer should be aware of the machine tie bar and clamping capability in order to design the mold to be able to properly clamp onto the machine. The proper design could assist the operation to be more efficient.
  4. The machine open-close area is another factor that need to be concerned. For example, when the machine already run at maximum close area, it does have the space of 240 mm, but the mold has the thickness of 220 mm. This mold could not work on this machine unless it been modified to increase the thickness to be more than 240 mm. In general, machine should not be work at maximum since the hydraulic at maximum could have weak power and impact to the machine operation process. On the other hand, the user should also be aware that the machine could be open and have enough area for the ejector to work

To sum up, the injection capability, clamping force, tie bar, and the open-close area would be the main factors that need to be aware when choosing the proper injection machine for the job. In order to get the suitable machine, the sequence of choosing should start with the injection capability, then to the clamping force. If there is problem, the increase of the sizing would be required. In general, bigger injection machine would be higher injection screw which relate to injection shot weight and also higher clamping force. After getting the proper size, the user should consider the tie bar whether it fit or not. If not, the user might consider find another machine with larger tie bar with same tonnage or increase to bigger machine with bigger tie bar. Lastly, the open-close area needs to be aware that it fit or not. If the area is too small, the users might need to consider in using bigger machine. On the other hand, if the requirement earlier requires large size machine but the close-open area is too big, the mold might need to be modified in order to fit the machine.

Lastly, If there is any demand in the plastic injection mold, we do welcome to assist throughout the process, please do not hesitate to contact us for plastic injection mold production at jajemold@gmail.com

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