Alignment and Positioning FAQs

Graphic position and alignment inspection verifies that printed elements—such as logos, text blocks, color bars, regulatory marks, and design features—are placed correctly relative to the package, label, or part. It confirms X/Y location, rotation, skew, and registration against a defined reference.

A typical system can detect:

• Shift (X/Y offset) of graphics
• Rotation (twist) beyond tolerance
• Skew or stretch/distortion
• Registration errors between colors/layers
• Print-to-diecut misalignment (graphics not centered on the label/package)
• Cut/trim misalignment impacting the visible graphic area

Most systems use a combination of:

• Fiducials or known reference edges (package edge, seal edge, die-cut edge)
• Pattern matching to locate key graphic features reliably
• Sub-pixel measurement tools for tighter repeatability
• Encoder/trigger timing so the image is captured at the same physical position every time

Strobe lighting is commonly used to eliminate motion blur.

Misaligned/mislayered webbing inspection monitors continuous materials (films, laminates, paper, nonwovens) to ensure layers and edges are tracking correctly and that laminations/overlays are registered within tolerance.

Common detections include:

• Edge drift (web wandering)
• Telescoping or lateral shift (layer offset)
• Misregistration between printed layers or laminated layers
• Wrinkles, creases, puckering
• Stretch variation causing repeating misalignment patterns
• Splice issues that change alignment and tension

Systems typically use one or more reference strategies:

• Edge tracking: measure distance from web edge(s) to a known reference
• Fiducials/registration marks: track printed marks for precise register control
• Feature matching: locate repeating print features when marks aren’t available

The best method depends on whether the process is dominated by material motion or print registration.

Most systems use:

• Presence/absence detection in expected zones
• Edge/contour checks to confirm label boundaries
• Rotation and skew measurement to confirm label orientation
• Coverage checks to ensure the label is not shifted or partially applied

This is commonly combined with barcode/2D code verification for label correctness.

A label is typically considered misapplied when it violates limits for:

• Offset (too high/low or left/right)
• Rotation (tilted)
• Wrinkles/bubbles beyond a threshold
• Partial application (label lifted, missing corner, flagging)
• Incorrect overlap on wrap labels (seam position wrong)

Measurement uses reference edges or fiducials (container shoulder, seam line, molded features).

Common approaches include:

• Multiple cameras around the container for full coverage
• Rotating the container (spin station) to inspect 360°
• Pattern matching that compensates for curvature distortion
• Carefully designed lighting to reduce glare on curved plastics

Rotational systems are common when seam placement and full wrap verification matter.

Cap/lid inspection often includes:

• Presence check (cap exists)
• Seating height measurement (cap fully applied)
• Tilt detection (cross-thread or deformation)
• Tamper band verification (present and intact when required)
• Color/variant verification for the correct cap type

These checks can be done with one or more cameras depending on visibility.

Yes—this is typically solved by:

• Measuring cap height relative to the container rim
• Checking the expected gap profile around the cap circumference
• Using multiple viewpoints or 3D when needed

Partially seated caps are a common high-value use case because they can cause leaks and customer complaints.