Corona Treatment PET Film

PET Film Supply Company is a Corona Treatment PET Film manufacturer supplying surface treated PET film for printing, coating, lamination, adhesive bonding, metallizing, and tape converting. Its value is the activated surface, not only the clear base. Corona treatment raises surface energy and helps the treated side keep a workable dyne level, so ink, glue, primer, coating, and metal layers wet the PET surface more evenly.

Product Overview

Corona treated PET film is made for processes where surface bonding matters. Untreated PET has a stable, low-energy surface, so liquid materials may not spread evenly. In converting, this can cause ink skipping, coating shrinkage, adhesive lifting, weak lamination, or uneven metal adhesion.

Corona discharge activates the PET surface and helps ink, adhesive, primer, coating, and metal deposition layers form better contact. Single-side treatment is used when one surface needs bonding. Both-side treatment is used when both surfaces must accept coating, glue, or lamination layers. The treated-side direction should be confirmed before production because wrong-side processing can cause failure even when thickness and width are correct.

PET Film Supply Company checks treated-side surface tension, roll cleanliness, winding quality, edge condition, and surface direction before shipment. The treated side is commonly controlled around 50–52+ dyn/cm, while the untreated side is often around 40–42 dyn/cm. For critical work, check again after long storage, open-roll exposure, dust contact, or high humidity.

Benefits

• Improves surface energy for cleaner ink wetting and stable print coverage.
• Helps adhesive, primer, coating, and laminating glue contact the treated PET surface.
• Reduces ink skipping, coating gaps, glue lifting, weak lamination, and poor metal adhesion.
• One-side corona treatment works for single-surface printing, coating, adhesive bonding, or metallizing.
• Both-side corona treatment supports double coating, multilayer structures, and special tape constructions.
• Treated side can be marked inside-wound or outside-wound to match machine direction.
• Suitable for solvent-based, water-based, adhesive, primer, and metallizing processes after compatibility testing.

How Does Corona Treatment Improve Ink, Adhesive, and Coating Bonding?

Corona treatment increases the surface energy of polyester film, helping liquid materials spread evenly across the treated side. When surface tension is too low, ink, adhesive, primer, or coating may bead up instead of forming a continuous layer. A properly treated surface can improve print sharpness, coating anchorage, adhesive contact area, lamination stability, and metal layer bonding.

Dyne value is an important control point, but not the only proof of final bonding strength. Final performance also depends on ink type, glue formula, coating thickness, drying temperature, web speed, pressure, curing condition, and aging environment. For a new structure, test with the actual ink, adhesive, coating, or laminating material before mass converting.

TDS

Applications

• Printing base film requiring stable ink wetting.
• Adhesive coating film for tapes, labels, and bonding layers.
• Primer or functional coating carrier film requiring surface activation.
• Lamination film for flexible packaging and multilayer structures.
• Metallizing base film where improved metal adhesion is required.
• Electrical and electronic converting where coating adhesion or adhesive anchorage is required.
• Roll-to-roll production where surface tension stability must be controlled.

What Should Be Checked When Choosing One-Side or Both-Side Corona Treated PET Film?

One-side corona treated PET film is usually enough when only one surface needs ink, glue, coating, primer, or metallizing. It is used for printed layers, single-side adhesive coating, one-side lamination, or metallized structures. The untreated side may support different winding, contact, or handling behavior.

Both-side treated film is better when both surfaces need active bonding, such as double-side coating, multilayer lamination, special tape construction, or two-step converting. Before mass converting, confirm required surface tension, treated-side direction, storage time, and compatibility with the actual ink, adhesive, coating, or laminating system. Many problems start when thickness and width are correct, but the corona side is wrong or the treated surface has faded during storage.

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FAQ

Q1: Is Corona Treatment PET Film the same as normal clear PET film?

No. The key difference is the activated surface for printing, coating, gluing, laminating, or metallizing.

Q2: What surface energy should be used before printing or coating?

Many jobs use treated-side levels around 50–52+ dyn/cm, but the right value depends on ink, adhesive, coating, speed, drying, and final bonding requirements.

Q3: Should one-side or both-side corona treatment be selected?

Choose one-side treatment when one surface needs bonding. Choose both-side treatment when both surfaces require printing, coating, adhesive bonding, lamination, or multilayer construction.

Q4: Why should the treated surface be checked before use?

Corona level can change with storage time, humidity, dust, handling, and roll exposure. Testing helps reduce ink skipping, coating failure, adhesive lifting, weak lamination, and poor metal adhesion.