CPP Heat Seal Film
Description
Technical Parameters
CPP Heat Seal Film functions as the internal sealant web in multi-layer flexible packaging structures. Produced via cast extrusion, this polyolefin film delivers optical clarity, low heat-sealing thresholds, and mechanical flexibility. When laminated to outer web materials such as PET, BOPP, or aluminum foil, it provides hermetic seal integrity while resisting flex cracking. It serves packaging converters and pouch manufacturers producing stand-up pouches, 3-side seal bags, and form-fill-seal packaging where consistent seal strength and visual product presentation are required.
Key Features
Low Seal Initiation Temperature (SIT): Establishes firm seals at reduced thermal settings, expanding the operating window on vertical and horizontal packaging machinery.
Optical Clarity & Gloss: Low haze characteristics maintain transparent window visibility and showcase print graphics on unprinted or reverse-printed laminations.
Engineered Coefficient of Friction (COF): Controlled slip additive levels prevent roll blocking and ensure smooth web feeding through high-speed converting equipment.
Mechanical Flex Resistance: Absorbs drop impact and shipping stresses to minimize package leaker rates during distribution.
Applications
Snack Food & Confectionery Packaging: Laminated with BOPP or PET for dry food bags requiring moisture barrier properties and reliable seal paths.
Pouch Converting: Applied as the inner sealing web for 3-side seal pouches, quad-seal bags, and stand-up pouches.
Flow-Wrap Applications: Used in single-ply or laminated formats for bakery goods and consumer products processed on horizontal wrapper lines.
Adhesive Lamination Compatibility: Compatible with solvent-based and solvent-free polyurethane adhesives used in flexible packaging lamination lines.
Materials & Specifications
|
Parameter |
Specification / Range |
Test Standard |
|
Material Composition |
3-Layer Co-extruded Cast Polypropylene (CPP) |
Internal Standard |
|
Thickness Range |
20 µm – 80 µm |
ASTM D374 |
|
Thickness Tolerance |
±3% to ±5% |
ASTM D374 |
|
Roll Width Range |
300 mm – 2000 mm |
Custom |
|
Core Inner Diameter |
3 inch (76 mm) or 6 inch (152 mm) |
Standard Industrial Core |
|
Seal Initiation Temp (SIT) |
105°C – 120°C (Grade Dependent) |
ASTM F88 |
|
Heat Seal Strength |
≥ 15 N / 15mm |
ASTM F88 |
|
Coefficient of Friction (COF) |
Dynamic: 0.20 – 0.35 (Treated / Untreated Side) |
ASTM D1894 |
|
Haze |
≤ 3.0% |
ASTM D1003 |
|
Surface Treatment |
Corona treated single side (≥ 38 dyne/cm) |
ASTM D2578 |
How to Choose
To determine the correct film grade and specification for your project, please provide the following operational parameters:
End-Use Application:
Specify the packaged product and storage environment requirements.
Lamination Structure:
Define the outer substrate layers.
Packaging Equipment:
Indicate your machine type and line speed.
Dimensional Requirements:
Confirm required thickness (μm), slit roll width (mm), and core size.
Surface Specifications:
State corona treatment level and winding direction requirements.
FAQ
Q: How does CPP Heat Seal Film differ from PE Heat Seal Film in packaging applications?
A: CPP provides higher stiffness, better optical clarity, and cleaner cut edges during pouch making. PE typically offers higher impact resistance at low temperatures, whereas CPP is selected when package flatness, gloss, and moderate stiffness are primary requirements.
Q: Can standard CPP heat seal film be used for food products requiring hot-fill processing?
A: Standard general-purpose CPP is designed for room-temperature packaging. Hot-fill or pasteurization applications require specific high-temperature resistant resin grades to prevent film distortion or seal degradation during thermal exposure. Please confirm your filling temperature so we can recommend the appropriate grade.
Q: How do you ensure stable performance of the film on high-speed packaging lines?
A: Stable converting and packaging performance is achieved through precise gauge control within ±3–5% and controlled slip additive dispersion. This maintains consistent coefficient of friction (COF) levels and uniform heat transfer across the entire roll length.
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