Protective Film Rolls Company is a polyester pet film factory supplying PET / BOPET roll stock for industrial converting. The range includes plain film, treated grades, printable and coating-ready materials, insulation grades and appearance options. Specifications are matched to the next process. Master rolls, slit-to-width rolls and sheets can be prepared for different unwinding systems.
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A polyester pet film factory should separate PET / BOPET grades by function, not transparency alone. Two rolls with the same nominal thickness may run differently if surface treatment, shrinkage, flatness or winding setup changes. Polyester film mechanical properties, low moisture absorption and dimensional stability support consistent printing, coating, lamination and insulation work. When comparing China polyester PET film grades, check how the roll will be processed after delivery. Approving a clear grade without reviewing the next step can lead to weak adhesion or line adjustments.
The category covers plain PET / BOPET film for support layers, corona-treated film for improved surface energy, chemically treated film for reliable ink or coating adhesion, printable and coating-ready grades, electrical insulation film, and clear, hazy, white or matte options. Adhesive backing can be added for lamination-ready structures. Formats include master rolls, slit rolls and sheets. One-side and two-side treated grades should follow the actual processing route.
Start with the next production step. Untreated PET film suits strength, spacing, insulation or dimensional support. Corona-treated grades are better for inks, laminating adhesives or coatings that need improved wetting. Chemically treated film is appropriate when the bonding interface must remain stable. Before slitting, note one-side or two-side treatment, whether the treated face is wound inside or outside, and the required winding direction. Polyester film thickness tolerance, flatness, core size and outer diameter should fit the unwinding setup. Polyester film chemical resistance should be reviewed against the actual medium, temperature and dwell time. Test a representative roll before repeat production.
Run a representative roll under the intended converting conditions. Watch tracking, edge alignment, flatness and unwinding stability, then note thickness, slit width, core size, outer diameter and winding direction. Where adhesion is critical, check surface energy after storage rather than relying only on the initial specification. For clear grades, review haze and light transmittance. For heat-sensitive operations, measure thermal shrinkage at the agreed temperature and dwell time. Keep the approved sample and batch reference for comparison.
Item | Typical Range / Customizable Value |
Material | PET / BOPET polyester film |
Film category | Plain, corona treated, chemically treated, printable, coating-ready, insulation grade |
Surface condition | Untreated, one-side treated, two-side treated |
Treated-side orientation | Wound inside or wound outside |
Appearance | Clear, hazy, white, opaque or matte |
Thickness | Grade-dependent range for process and end use |
Polyester film thickness tolerance | Specified by grade, thickness, width and application |
Width and roll length | Master-roll width or custom slit width, matched to equipment |
Core size and outer diameter | Selected for the unwinding system |
Roll flatness | Reviewed by thickness, width and equipment |
Winding direction | Regular wound or reverse wound |
Surface-treatment verification | Surface energy checked after storage where adhesion is critical; ASTM D5946 water-contact-angle reference where applicable |
Thermal shrinkage | ASTM D2732 reference where applicable |
Tensile properties | ASTM D882 reference where applicable |
Haze and light transmittance | ASTM D1003 reference where applicable |
Electrical insulation performance | ASTM D149 reference where applicable |
Thickness measurement | ASTM D6988 reference where applicable |
Chemical-resistance validation | Checked against medium, temperature and dwell time |
Supply format | Master rolls, slit-to-width rolls, narrow rolls or sheets |
Sample approval | Actual-process trial, retained sample and batch reference recommended |
Protective Film Rolls Company can prepare the film grade, slit-roll format and treated-side orientation for the intended line. The agreed specification records thickness, polyester film thickness tolerance, width, roll length, core size, outer diameter, winding direction and appearance. It may also include one-side or two-side treatment, surface-energy checks after storage, shrinkage review at an agreed temperature and dwell time, haze or light-transmittance testing, tensile references and insulation-performance checks. For bulk orders, retain the approved sample, batch reference and roll-format notes.
Untreated PET film suits mechanical support, dimensional stability, spacing or insulation. Surface-treated film is more appropriate when the next step depends on ink adhesion, coating wetting, lamination strength or adhesive bonding. Corona treatment raises surface energy, but the treated surface can change during storage. Test the selected grade with the intended ink, coating or adhesive system before repeat production. Where both faces are processed, specify a two-side treated grade and confirm roll orientation.
PET is the most common polyester film material. BOPET refers to biaxially oriented PET film.
Master rolls, slit-to-width rolls, narrow rolls and sheets can be prepared for different equipment requirements.
Confirm whether the treated face should be wound inside or outside, then match it to the next process.
Review film grade, thickness tolerance, width, roll length, core, outer diameter, winding direction, treatment type, treated-side orientation and sample-approval conditions.
