Control | PACKAGING | Technical Papers

Información Técnica

exterior coating

  1. Objectives of Exterior Varnishing:
    • Provide protection against corrosion.
    • To give a good appearance to the exterior, with decorative and product identification function.
    • Be resistant to sterilization processes.
    • Facilitate and be resistant to mechanization processes.
    • Abrasion resistant.
  2. Types of Varnishes:
    • Vinyl, Acrylic or Epoxy-Phenolic: These exterior coatings are applied to protect tinplate from external corrosion. They can be colorless or, in some cases, gold-plated.
    • Finishing Varnish: It is a transparent varnish applied over the printing to protect it, since the inks have little resistance to abrasion.
  3. Application Process:
    • Varnishing table: The required weight of varnish is applied and the varnished sheets are placed on grills that guide them through an oven to cure the varnish.
    • Curing Oven: The sheets pass through an oven where the varnish is cured, ensuring that the applied coating is durable and resistant.
  4. Exterior coating:
    • To protect the outer weld and preserve the integrity of the can, a protective varnish is applied to the side seam. This varnish is usually colorless and fast drying.
  5. Quality Control:
    • Tests are carried out to control the quality of varnish application, ensuring that the protection and appearance objectives are met.

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