Quality Control of Pipette Tips

The unique characteristics of pipette tips necessitate excellent dimensional stability, which in turn demands elevated standards for quality control during production. This article will delve into this topic from two perspectives.

Mold Inspection

The inspection and control of molds are critical for ensuring quality, with specific attention required for the following aspects:

Mold Bases: Focus on measuring the inner frame's eccentricity within the mold base. Measure at least two layers of the upper and lower frames to prevent misalignment.
Mold Cores: When inspecting mold cores, prioritize control over glue, penetration, and impact positions. Additionally, ensure balanced glue injection.
Inserts: Strictly adhere to the 2D drawing specifications when measuring inserts, emphasizing concentricity control to prevent any deviations from affecting the final product's concentricity.
Appearance: The appearance of pipette tips directly impacts their liquid storage accuracy. Therefore, examine for scratches, deformations, and irregular polishing in areas with high-gloss mold structures.

Inspecting Pipette Tips

Managing and controlling molded products is a crucial aspect of production, ensuring quality consistency and prompt detection of abnormalities to prevent recurring issues. Attention should be directed towards the following areas:

Appearance: Ensure the surface of the product is free from noticeable bubbles and scratches. Check for any burrs at the tip end or residual burrs along the parting line. Additionally, verify that the inner wall of the pipette tip is smooth to prevent residual liquid from impacting test accuracy.

Dimensions:

Size Control: Precisely regulate the dimensions of the pipette tip. Utilize three-dimensional measuring cones to calculate the angle of the inner wall.
Concentricity: Key control is required for the concentricity of the product as it directly influences sealing effectiveness and solution storage accuracy.

Sealing Performance:

Visual Inspection: Place the pipette vertically after liquid absorption for 15 seconds and observe for any slow droplet flow.
Pressure Inspection: Employ specialized inspection equipment to assess pressure and determine tightness.

In conclusion, maintaining excellent dimensional stability in pipette tip production requires meticulous quality control measures at every stage. From thorough mold inspection to vigilant product examination, attention to detail ensures the consistent delivery of high-quality pipette tips. By adhering to elevated standards and continuously monitoring for abnormalities, manufacturers can uphold the precision and reliability essential for laboratory applications.

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