Make Cap Inspection For Tetra Pak Bags Reliable at 24000 Packs

2026/10/19 16:08

In diamond-pack beverage production, small defects create outsized risk: a missing cap, a shifted closure, or an inkjet code that’s absent or distorted can quickly turn into downstream waste and rework. Cap Inspection For Tetra Pak Bags addresses those issues with online, non-contact inspection that identifies nonconforming packs and triggers automatic rejection. At the center of this approach is the Cap Inspection For Tetra Pak Bags, designed to inspect both cap quality and inkjet printing quality on the same line. Cap Inspection For Tetra Pak Bags supports speeds up to 24,000 packs/hour and is commonly evaluated by buyers who want one inspection point to cover the most frequent cap and code problems without adding manual checks.


High-speed Tetra Pak inspection line


MT-LL-PG-PM-C2 inspection system line


How the inline inspection works

Cap Inspection For Tetra Pak Bags is specified for on-site installation 1.5–2 meters straight behind the capping machine. The workflow is designed to be straightforward for line integration:

•A positioning sensor detects the arriving package.
•The control unit records identification and encoder signals.
•Two Gigabit digital cameras capture images (top to bottom) of the paper bag, cap, and inkjet code.
•Images are transmitted to an image processor for analysis.
•Results are displayed on the HMI and communicated back to the control unit.
•If a package fails inspection, the control unit commands the rejector to remove it online.

This sequence is the backbone that enables Cap Inspection For Tetra Pak Bags to combine multiple inspection tasks in one station.


Cap and code inspection diagram


Cap presence detection

For many lines, the most urgent issue is simply ensuring a closure exists. Cap Inspection For Tetra Pak Bags includes cap presence detection and rejects packs with an absent cap.

Specified inspection accuracy for absent cap:

•Rejection rate: ≥99.99%
•False detection rate: ≤0.01%

Cap position deviation detection

A cap may be present but not seated in the intended position. Cap Inspection For Tetra Pak Bags checks cap misalignment using a specified criterion of offset from center: 5 mm max.

Specified inspection accuracy for cap misalignment:

•Rejection rate: ≥99.99%
•False detection rate: ≤0.01%

Cap rotation detection

Rotation is treated as a separate defect category in Cap Inspection For Tetra Pak Bags. The inspection criterion is specified as a vertical distance difference between cap top/bottom ≥5 mm.

Specified inspection accuracy for cap rotation:

•Rejection rate: ≥99.99%
•False detection rate: ≤0.03%

Inkjet code presence verification

Beyond cap checks, Cap Inspection For Tetra Pak Bags verifies whether inkjet printing is present. Packs with no inkjet print are identified and rejected.

Specified inspection accuracy for no inkjet print:

•Rejection rate: ≥99.99%
•False detection rate: ≤0.01%

Missing code detection

Not all code problems are “no print.” Cap Inspection For Tetra Pak Bags also supports missing code detection using two specified thresholds for overall missing content:

•Overall inkjet print missing >50%: rejection rate ≥99.99%, false detection rate ≤0.01%
•Overall inkjet print missing >30%: rejection rate ≥99.96%, false detection rate ≤0.01%

Code integrity verification

For buyers focused on traceability and day-to-day print stability, Cap Inspection For Tetra Pak Bags includes code integrity checks covering defects such as:

•Stretched (elongation) or squeezed (shortening) print
•Position deviation
•Duplicated print
•Reversed print

Specified inspection accuracy for deformed, duplicated, or reversed packaging print:

•Rejection rate: ≥99.98%
•False detection rate: ≤0.01%

Key specifications and operating features buyers often check

When sourcing Cap Inspection For Tetra Pak Bags, buyers typically confirm not only inspection items and rates, but also whether the system is suited to continuous plant operation:

•Applicable production speed: 24,000 packs/hour
•Protection rating: IP65
•360° cap inspection and 360° inkjet code inspection features designed to reduce false rejects associated with surface scraping, grabbing, or friction
•Zero-delay cap inspection, specified as unaffected by cap material, color variation, or packaging material interference
•Industrial-grade cooling system for stable operation (including extended summer use)
•Defect image storage with a customizable retention period
•Multi-level HMI access control
•Smart rejection control, including automatic line stop after a preset number of consecutive defective rejections
•24/7 remote monitoring and equipment control service

For quick comparison, the following table summarizes the published inspection accuracy values used in Cap Inspection For Tetra Pak Bags evaluations.

Inspection itemInspection contentRejection rateFalse detection rate
Bottle cap inspectionAbsent cap≥99.99%≤0.01%
Bottle cap inspectionCap misalignment (offset from center: 5 mm max)≥99.99%≤0.01%
Bottle cap inspectionCap rotation (top/bottom vertical difference ≥5 mm)≥99.99%≤0.03%
Inkjet printing inspectionNo inkjet print≥99.99%≤0.01%
Inkjet printing inspectionOverall missing >50%≥99.99%≤0.01%
Inkjet printing inspectionOverall missing >30%≥99.96%≤0.01%
Inkjet printing inspectionDeformed, duplicated, or reversed print≥99.98%≤0.01%

Where to learn more

For product specifications and the full scope of inspection items, see Cap Inspection For Tetra Pak Bags. Related pages include Tetra Pak Inspection Machine and Tetra Pak Code Inspection Machine.

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