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Printing - Coding - Sealing Machinery


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Coding and sealing guidance

Selecting coding, printing and sealing equipment

Coding and sealing equipment must be matched to the substrate, information, line speed and pack environment. A readable code and a sound seal both require production materials for testing.

Variable coding

Define the date, batch, barcode or other data, the print area and the substrate. See inkjet coding for a current online coding option.

Print and apply

Where a full variable label is required, a printer-applicator can print and place it in one process. Compare print and apply labelling.

Heat and induction sealing

Seal method depends on the pack construction. Review induction sealing and the bag and pouch sealing range.

Test the real surface and production conditions

Ink adhesion and contrast vary with material, colour, coating, moisture and distance from the print head. Label printing also depends on ribbon, label face stock and resolution. Provide the exact production substrate and the smallest required character or code.

For heat sealing, supply the full laminate and pack thickness. Seal strength is affected by temperature, pressure, dwell and contamination. For induction sealing, the container, cap and foil liner must be evaluated as a complete closure system.

Specify the line interface

  • Conveyor speed and product spacing
  • Print or seal position
  • Trigger and encoder signals
  • Data source and recipe changes
  • Inspection or reject requirements
  • Environmental and washdown conditions

Provide the exact pack material and required code or seal for testing.

Review coding or sealing

Buyer questions

Which coding technology should I use?

The choice depends on substrate, code content, print area, contrast, line speed and environment. A sample print on the production material is the most useful comparison.

Can coding be added to an existing conveyor?

Often it can, provided there is enough controlled product travel, a trigger position, mounting space and suitable electrical and control interfaces.

What is needed for a barcode test?

Provide the symbology, data length, required size, substrate and verification standard or acceptance method. Resolution and contrast must be tested together.

Why do pouch seals fail?

Incorrect temperature, pressure or dwell, wrinkles, contamination and unsuitable laminate can all reduce seal strength. The real film and product should be tested.

Does induction sealing work with every cap?

No. The container, cap, liner and product environment must be compatible with the induction process and the intended seal performance.

Data and pack-quality planning

Specify variable data, verification and sealing acceptance

Coding, inspection and sealing should be defined by the finished pack and the line response to a failed result.

Provide the exact code content, substrate, print window, data source and line speed. Separate print presence, readability, correct content and barcode quality. Define how each result remains linked to the correct pack and how rejection is confirmed.

For sealing, identify the full material structure, contamination risk, seal location, heat or induction process and acceptance method. Use the coding and inspection guide and wrapping and sealing guide to prepare the specification.

Related machinery guidance

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Printing, coding and sealing project detail

Define the substrate, message, verification and finished seal separately

Printer selection depends on the actual substrate, surface, code content, print area, line speed, presentation and verification method. Sealing depends on material construction, clean contact surfaces, heat or energy input, pressure, dwell and cooling. A combined line should define both results and the response to a failed code or seal.

Sealing process choice

Does the pack need induction or direct heat sealing?

Induction and direct heat sealing act on different package constructions. Define the container, closure, liner, film layers, product contamination, process sequence and test method before choosing the machine family.

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