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4.5Mic BOPET film clear transparent , unprinting & uncoating ( for priting and laminating) ,

4.5Mic BOPET film clear transparent , unprinting & uncoating ( for priting and laminating) ,

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4.5Mic BOPET film clear transparent , unprinting &  uncoating ( for printing and laminating) 


The 4.5-Micron (4.5um) clear, transparent BOPET film in its "unprinted and uncoated" state isthe rawest form of high-performance polyester substrate. In the industry, this is often referredto as "Plain Base Film" or "Primary Film." When used specifically for printing andlaminating, this ultra-thin gauge serves as a high-clarity carrier that allows the graphics of thesubstrate beneath it to show through with maximum brilliance.
1. Technical Profile: The "Plain" Base FilmUnlike TTR-grade film (which may have back-coatings) or Metallized film (which has analuminum layer), the Clear/Transparent version focuses on optical purity and surface energy.
2. Why Use "Clear & Uncoated" 4.5um for Lamination?Using a plain 4.5jum film instead of a 12um film or a pre-coated film offers specific industrialadvantages:
A. The "Invisible" Protective ShieldBecause the film is so thin (4.5pm), it is nearly invisible once laminated to paper or cardstock.It provides a high-gloss finish and scratch resistance without the bulk or "plastic feel" of
thicker films.
B. Optimal Thermal Conductivity
In "Thermal Lamination" (where the film is bonded using heat and a thin glue layer), the 4.5umthickness allows heat to pass through almost instantly. This enables faster line speeds onlamination machines compared to thicker substrates.
C. Superior Yield (Area Coverage)
This is the strongest commercial argument.
· 12m PET:Yields ≈ 60 m2/kg.
· 4.5um PET:Yields ≈ 158 m2/kg.
Result: You cover 2.6 times more area with the same weight of plastic, significantlylowering the "cost per square meter."
3. Application Workflow: Printing & Lamination
When a factory buys "Clear Uncoated" 4.5jum film, the process typically follows these steps:1. Reverse Printing (Optional): The film is printed on the "inside" (the side that will beglued). This protects the ink from scratches because it is sandwiched between the filmand the paper.
2. Adhesive Coating: A lamination adhesive (solvent-based or solvent-less) is applied to thetreated side of the 4.5um PET.
3. Nip Rolling (The Lamination): The PET film and the target substrate (e.g., printedcardboard) are pressed together between heated rollers.
4. Curing: The composite is left to dry or cure, creating a permanent bond.
4. Key Performance Keywords for This GradeIf you are sourcing or selling this specific "Clear & Uncoated" grade, use these terms to definethe quality:
 Optical Grade: Implies the film is free of "gel" or "fish-eyes" that would ruin the look of aprinted box.
Slip Level: "Medium Slip" is usually preferred so the film can be rewound easily withoutsticking to itself (blocking).
Antistatic Properties: Plain film can be very static-prone; specify "Anti-static treated" ifusing high-speed automatic feeders.
Shrinkage Control: Crucial for lamination; if the film shrinks too much in the dryingtunnel, the final laminated product will "curl."
5. Typical End-Use Products
· Luxury Food Packaging: Glossy boxes for chocolates or tea.
Book Covers & Magazines: High-end dust jackets.
Cosmetic Cartons: Providing a premium, wipe-clean surface.
Security/ldentity Threads: Slit into very narrow strips and embedded into paper.
Would you like me to prepare a "Yield Comparison Chart" for 4.5jm vs. 6jm vs. 12um?This is often the most effective tool for convincing a lamination plant to switch to the thinner
4.5um grade.




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