"""
Knowledge about label substrates and adhesive systems for packaging labels.
"""

title = "Label Substrates and Adhesives"

content = """
Pressure-sensitive labels serve critical identification, branding, and
functional roles on packaging. Substrate and adhesive selection ensures
performance throughout the product lifecycle.

**Paper Label Stocks:** Uncoated papers offer cost efficiency and printability
for dry, indoor applications. Coated papers provide smoother surfaces for
high-quality graphics. Thermal papers enable variable information printing
without ribbons. Direct thermal papers are heat-sensitive; thermal transfer
papers require ribbon imaging. Durability limitations restrict paper labels
to controlled environments.

**Film Label Stocks:** Polypropylene (PP) films balance cost, durability, and
conformability for bottles and flexible packaging. Polyethylene (PE) films
offer excellent squeezability for contoured containers. Polyester (PET)
provides premium durability, chemical resistance, and dimensional stability.
Vinyl films deliver extreme conformability and outdoor durability. Film
labels resist moisture, tearing, and fading but require appropriate printing
technologies and surface treatments.

**Adhesive Categories:** Permanent adhesives form strong bonds that destroy
the label upon removal attempt. Removable adhesives allow clean label removal
without residue for reusable containers. Repositionable adhesives permit
initial adjustment before developing permanent bond. Freezer-grade adhesives
maintain tack at sub-zero temperatures. Heat-resistant adhesives survive
pasteurization, retort, and hot-fill processes.

**Specialty Adhesives:** Wash-off adhesives release in alkaline wash systems
for bottle return programs. Dissolvable adhesives break down in water for
compostable packaging. Food-contact adhesives meet FDA regulations for direct
or indirect food contact. Tamper-evident adhesives fracture upon removal
attempt, providing security features.

**Liner Systems:** Paper liners offer cost efficiency and easy die cutting.
Film liners provide dimensional stability for thin labels and high-speed
application. Liner release coatings (silicone) determine stripping force.
Sustainability initiatives drive interest in thinner liners and linerless
technologies that reduce waste and transportation costs.
"""

version = "0.0.1"
