The size measurement of aluminum caps is a precise task that requires measuring multiple key dimensions to ensure their perfect fit and sealing performance with the bottle mouth. The following is a detailed explanation for measuring the size of aluminum covers: Part 2
2. Height Dimensions
Overall Height (H):
Definition: The vertical distance from the highest point at the top of the aluminum cover to the bottom edge.
Measuring tool: height gauge or caliper with depth gauge.
Importance: Ensure that the height of the bottle cap conforms to the design and does not affect the operation of the stacking and filling lines.
Internal Height:
Definition: The depth of the cavity inside the bottle cap.
Measuring tool: Depth rod of caliper.
Importance: There must be sufficient space to accommodate the top of the bottle mouth and the inner lining.
3. Thread Specification
The thread of the aluminum cover is formed by "rolling", and its size is crucial.
Measurement method:
Thread Plug Gauge: As mentioned above, it is a fast and effective method to determine whether the overall dimensions of a thread (diameter, pitch, profile) are qualified.
Optical comparator: enlarges and projects the thread profile onto the screen, compares it with a standard line diagram, and can accurately measure pitch, thread angle, and thread height.
4. Tamper Evident Band size (only applicable to ROPP and other anti-theft covers)
Bridge Number and Length: The number and size of small connection points between the bottle cap body and the anti-theft ring.
Band Inner Diameter: After crimping, the inner diameter of the anti-theft ring needs to match the size of the lock ring at the bottleneck to ensure that it can lock and break when opened.
Measurement tool: Optical projectors are usually used for precise measurements.
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