Example of actual measurement process (using ROPP cover as an example)

Example of actual measurement process (using ROPP cover as an example) 

1. Sampling: Randomly select a certain number of bottle caps from the production batch.

2. Visual Inspection: Check for defects such as burrs, deformations, scratches, etc.

3. Dimensional Measurement:

Measure the outer diameter and total height with a caliper.

Use a "stop and go gauge" to inspect threads. Screw the "GO" end of the thread gauge into the bottle cap smoothly to the end; Attempt to screw in the 'NO-GO' again, with a maximum of 1.5 turns (specific standards vary depending on the specifications).

Place the bottle cap on an optical projector and measure the pitch (such as measuring the distance between 10 teeth divided by 10), tooth profile angle (usually 60 ° or 90 °), etc.

Measure the thickness and inner diameter of the anti-theft ring bridge strap.

4. Functional Test: Rotate the bottle cap onto the standard bottle mouth to test whether the rotation is smooth, whether the sealing performance (such as negative pressure sealing test) and the anti theft ring fracture effect meet the standards. 

summary

The measurement of aluminum cover dimensions is a systematic process, with the core being:

Perform a comprehensive functional inspection on the threads using a thread plug gauge (plug gauge).

Quantitative analysis of micro parameters of threads using precision instruments such as projectors.

Ensure that all dimensions form a precise fit with the size of the target bottle mouth. 

If you need to measure the drawing of a specific aluminum cover, you usually need to pay attention to the key dimensions and tolerances marked on the drawing, and use tools of the corresponding accuracy level for measurement.