Where Are Material Identification Marks Located?
Bottle Base (Triangular Symbol): The most common feature is the recycling symbol containing a number; this number indicates the type of material used.
Bottle Body (Side): Some beverage bottles feature English abbreviations-such as "PET"-printed directly onto the bottle surface.
Back of Label: Dairy product bottles often display codes-such as "PP5"-within the inner layer of the label.
Characteristics of Markings at Different Locations.
Bottle Base Markings:
Molded directly into the material; highly durable and resistant to wear.
May appear alongside the production date or mold number.
Requires rotating the bottle to view clearly.
Bottle Body Printing:
Commonly found on transparent bottles.
May utilize eco-friendly, erasable inks.
May be removed or lost when the label is peeled off.
Label-Based Information:
Requires peeling back the label to view.
Commonly found on opaque packaging.
May contain more detailed specifications.
Why Are These Locations Ideal?
Visual Discretion: Avoids compromising the aesthetic appeal of the packaging design.
Tactile Accessibility: The raised/embossed markings on the bottle base facilitate identification via touch (e.g., for Braille recognition).
Durability: Positioned away from areas subject to frequent friction or abrasion.
Manufacturing Efficiency: Integrated into the molding process for high-efficiency, one-step production.
Recycling Convenience: Easily identifiable during sorting processes, as bottles are often oriented with their bases facing upward.