What are the standards for hot runner vibration testing?

As of right now, the industry does not have a required standardized testing standard for hot runner vibration. The following standards are typically used by the mainstream injection molding industry, with an emphasis on three dimensions: production impact, amplitude, and frequency:

1. General Standard for Vibration Frequency: Conventional hot runners typically vibrate between 0 and 30 Hz. A frequency that is higher than 30 Hz is deemed excessive.

For naturally vibrating hot runners, the normal frequency should be kept between 1 and 20 Hz; for actively vibrating hot runners, the set vibration frequency should not be higher than 30 Hz.

2. General Standard for Vibration Amplitude: The typical vibration amplitude shall satisfy the following criteria when measured on the exterior of the hot runner manifold using a professional vibration meter:

Vibration amplitude ≤ 0.1mm for small hot runners (1 outlet 4 or less); ≤ 0.2mm for medium to big hot runners (1 outlet 8 or more); exceeding the top limit is regarded as excessive vibration.

3. Production-End Indirect Judgment Criteria

If the following requirements are satisfied, the product can still be deemed qualified even if parameters marginally exceed limits:

continuous production for over three months without any issues like glue leaks or loose connection screws;

The product has a defect rate of less than 3%, no surface flaws like vibration or flow markings, and dimensional fluctuations that are regulated within one-third of the design tolerance;

The corresponding temperature/pressure sensor's output is steady, free of zero-point drift or frequent jumps.

Stricter corporate requirements may be developed for particular products in a few high-end medical and automotive injection molding industries, but the fundamental dimensions will not significantly depart from the range mentioned above.