When selecting an injection molding machine, many customers focus primarily on clamping force and shot size. However, parameters related to mold compatibility and ejection performance are equally critical for stable and efficient production.
Below are five key technical specifications you should carefully evaluate when choosing an injection molding machine.
1. Maximum Opening Stroke of Injection Molding Machine The maximum opening stroke refers to the maximum travel distance of the moving platen.
This specification determines the available space for injection part removal. It is especially important when using robotic arms or automation systems. Insufficient mold opening distance may limit automation efficiency and affect production stability.
2. Maximum Ejection Force Maximum ejection force is the pushing force generated by the ejector system to overcome the holding force between the molded part and the core.
For deep cavity molds or complex plastic products, sufficient ejector force helps prevent deformation, sticking, or part damage during demolding.
3. Maximum Ejection Stroke Maximum ejection stroke indicates the maximum travel distance of the ejector system.
If the ejector stroke is insufficient, the molded part may not fully separate from the mold core, which can reduce productivity and increase defect rates.
4. Tie Bar Spacing of Injection Molding Machine Tie bar spacing includes both horizontal and vertical distances between tie bars.
This dimension determines the maximum mold size that can be installed and is a key factor in evaluating mold compatibility with the injection molding machine.
5. Maximum and Minimum Mold Thickness Maximum and minimum mold thickness define the acceptable mold height range for proper clamping.
If the mold height is below the machine’s minimum mold thickness, spacer plates can be added to ensure proper installation and safe operation.
Final Thoughts Choosing the right injection molding machine requires more than just evaluating clamping force. A comprehensive analysis of mold dimensions, product structure, automation requirements, opening stroke, and ejection performance ensures stable operation and higher production efficiency.
