Pearlized Packaging Film

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Description

Technical Parameters

Pearlized Packaging Film is a cavitated biaxially oriented polypropylene substrate featuring a white, pearlescent surface sheen. Produced via controlled micro-void formation during extrusion, the film offers reduced density and enhanced opacity. It serves as a surface-printable mono-web or as an outer web layer in flexible packaging laminations. Typical converting applications include high-speed horizontal form-fill-seal lines for confectionery, frozen dairy novelties, and personal hygiene wraps. The internal cavitated structure lowers overall mass per unit area, providing greater yield efficiency per kilogram.

Key Features

01/

Micro-Voided Pearlescent Appearance: Extrusion cavitation generates a white, lustrous light-reflection finish without requiring pigment coatings or aluminum foil.

02/

Low-Density Yield Advantage: Specific gravity ranging from 0.62 to 0.70 g/cm³ delivers higher square-meter coverage per kilogram compared to solid-core polymer films.

03/

Balanced Friction Coefficients: Slip-modified skin layers maintain stable surface slip properties (COF less than or equal to 0.30) through automated machine formers and sealing jaws.

04/

Controlled Thermal Sealing Range: Co-extruded sealable layers initiate hermetic bonds at lower temperatures, preserving web flatness on high-speed wrapping equipment.

05/

Treated Printable Surface: Corona-treated faces sustain dyne levels greater than or equal to 38 dynes/cm to support flexographic, rotogravure, and cold-seal adhesive applications.

Applications

Confectionery Flow Wraps: Single-ply or laminated wrappers for chocolate bars, baked snacks, and ice cream novelties utilizing heat or cold sealing.

Hygiene and Personal Care: Outer protective over-wraps for bar soaps and wet wipe packs requiring moisture defense and visual shelf differentiation.

Wrap-Around Bottle Labels: Roll-fed labeling stocks applied to beverage and container bodies via hot-melt systems.

Dry Food Pouches: Multi-layer laminate structures for snack bars and seasoning packets requiring light restriction and high-contrast graphics.

Materials & Specifications

Technical Parameter	Standard Value / Specification	Test Method
Substrate Material	Cavitated Biaxially Oriented Polypropylene	Factory Standard
Film Thickness	20 µm, 25 µm, 30 µm, 35 µm, 40 µm	ASTM D374
Density / Specific Gravity	0.62 – 0.70 g/cm³	ASTM D792
Surface Yield (30 µm gauge)	~51.2 m²/kg	Calculated
Tensile Strength (MD / TD)	MD greater than or equal to 100 MPa / TD greater than or equal to 180 MPa	ASTM D882
Elongation at Break (MD / TD)	MD less than or equal to 180% / TD less than or equal to 60%	ASTM D882
Dynamic Friction (Film to Metal)	less than or equal to 0.30	ASTM D1894
Seal Initiation Temperature	105°C – 110°C	Factory Standard
Heat Seal Strength	greater than or equal to 2.5 N/15mm (120°C, 0.2 MPa, 1s)	ASTM F88
Surface Tension (Treated Side)	greater than or equal to 38 dynes/cm	ASTM D2578
Light Transmission / Opacity	Light Transmission less than or equal to 25%	ASTM D1003
Reel Core Diameter	76 mm (3 inch) or 152 mm (6 inch)	Standard Core
Slitting Width Range	200 mm – 1600 mm (Customizable)	Tolerance plus or minus 1 mm

How to Choose

To determine the correct film configuration for your converting operations, provide the following parameters in your technical inquiry:

Machine Processing Parameters:

Specify equipment type (horizontal or vertical form-fill-seal), operating speed, and sealing dwell times.

Sealing Requirements:

Indicate whether thermal heat-sealing or cold-seal adhesive coating is applied.

Lamination Structure:

Confirm if the film runs as a single-ply mono-web or requires secondary lamination layers such as polyethylene or cast polypropylene.

Dimensional Specifications:

Define targeted thickness in micrometers, reel slitting width in millimeters, maximum outer roll diameter, and core size.

Functional Limits:

State specific light barrier requirements, friction coefficient thresholds, or ink adhesion standards.

FAQ

Q: How does Pearlized Packaging Film reduce material costs compared to standard solid white film?

A: The film features microscopic internal air cavities created during stretching, which lowers the specific gravity to 0.62–0.70 g/cm³ compared to 0.90 g/cm³ for solid white films. This reduced density yields approximately 25% to 30% more surface area per kilogram at equivalent thickness gauges, decreasing total polymer weight per package.

Q: Is Pearlized Packaging Film suitable for cold-seal adhesive application?

A: Yes. The corona-treated surface maintains a surface energy above 38 dynes/cm, ensuring secure anchorage for pattern-applied synthetic rubber cold-seal adhesives and release lacquers used in heat-sensitive confectionery lines.

Q: What is the recommended shelf life and storage condition to maintain surface treatment?

A: Corona treatment naturally decays over time. For optimal ink transfer and lamination bond strength, convert the rolls within six months of production while storing them in a dry environment below 30°C away from direct sunlight.

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