Based on your feedback below, I have the following points:
1. I believe you are very well aware that the weight checker does not improve the performance of filling machine in the area of filling weight variation of powder, unless your system has the real-time feedback between the weight checking station and the cylinder’s volume control of filling station (in which I really doubt you have). The checker simply rejects those vials that are out-of-spec.
The machine we sold to the Taiwanese pharmaceutical company is “Yung Shin Pharmaceutical Ind. Co., Ltd.”. Wakamoto was conducting a filling trail at Yung Shin Pharmaceutical, and they required the weight checker in the machine which should be 100% check. However, we didn’t have the weight checker at the time.
2. In case that you may have the data record of filling weight variation during the previous trial using Wakamoto’s API, would you mind sharing the results.
If Wakamoto requires 40mg, please find the attachment for the test result.
3. I foresee that the major causes of filling weight variation should be mostly due to the API that is known to have a bad flow rate. And your machine may be doing okay, just like other machines in the market. During the filling demonstration, if your engineering team may have certain observation/suggestions regarding the powder flow rate and the methods for improvement, you should make recommendations to Biolab and/or Wakamoto.
Yung Shin Pharmaceutical had made a test to change 600 mesh net to 800 mesh net. However, the weight is not stable when using 800 mesh. Therefore, they change back to use 600 mesh. Although using 600 mesh net will suck more remain powder, the weight is more accurate than 800 mesh.