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Transparent Rewritable Film
Reversible imaging polyester film enabling monochromatic text and graphics creation via thermal or mechanical pressure without toner or ink.
Manufactured by Shanghai Hanker Industrial Co., Ltd.
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Product Overview
Transparent Rewritable Film is an imaging substrate that forms visible marks through localized physical modification of its optical clarity. The film consists of a base PET layer coated with a proprietary opaque- transparent switching composition. When pressure or heat is applied, the coating transitions from a translucent light-scattering state to a transparent state, creating contrast visible against backlit or dark backgrounds. Erasure is achieved through uniform heat application, resetting the coating to its original scattering condition.
This technology enables paperless workflow for temporary labeling, reusable ID cards, and dynamic shelf labels. The PET carrier provides resistance to tearing and moisture, extending usable cycles beyond 200 write-erase iterations. The film requires no consumables (ribbon, ink, toner) for image formation, reducing per-use cost in high-volume rotation applications.
Imaging Mechanism
Thermal / Pressure-induced optical clearing
Base Film
PET, 75µm - 188µm
Write Cycles (Minimum)
200
Erasure Method
Conductive heat roller / Thermal head
Product Parameters
Technical specifications for reversible thermal imaging film under ISO 18946 and proprietary cycle testing protocols.
Imaging & Optical
| Initial Haze (Unwritten State) | 75% - 85% |
| Written Area Haze | < 12% |
| Contrast Ratio (Written/Unwritten) | 6:1 - 8:1 |
| Image Resolution (Thermal Head) | 203 DPI - 300 DPI |
Cycle Durability
| Write Energy Requirement | 0.4 mJ/dot - 0.7 mJ/dot |
| Erasure Temperature | 110°C - 130°C |
| Erasure Dwell Time | 0.5 sec - 2.0 sec |
| Cycle Consistency (OD Variance) | ±0.1 (1-200 cycles) |
Environmental & Mechanical
| Storage Stability (Written Image) | > 1 year @ 23°C/50%RH (dark) |
| Humidity Effect (90% RH) | Contrast reduction < 10% |
| Abrasion Resistance (written area) | 100 cycles / 500g load |
| Flexural Endurance | MIT > 500 cycles |
Note: Write energy correlates directly with thermal head resistance and ambient temperature. Lower energies required > 25°C ambient.
About Shanghai Hanker Industrial Co., Ltd.
Shanghai Hanker Industrial Co., Ltd. is China Transparent Rewritable Film Manufacturers and Wholesale Transparent Rewritable Film Suppliers. With over 20 years of industry experience, we have grown into a fully-integrated enterprise capable of producing a complete range of products across the entire industrial chain.
2004-2005
Company Foundation
Shanghai Hanker Industrial Co., Ltd began preparations in 2004 and was officially registered and established in 2005. The DPI brand was founded in the same year, marking the beginning of our journey in the adhesive materials industry.
2012
Expansion of Production Base
To enhance the influence and market share of the DPI brand, we expanded our production base to Nanhuating Industrial Park in Fengxian District, Shanghai. The facility covers 25,000 square meters and employs over 160 people, equipped with modern production workshops and advanced equipment including silicone coating machines, laminating machines, and automated punching machines.
2016
New Manufacturing Facility in Jiangsu
We established Jiangsu DPI New Materials Co., Ltd. in Qidong, Jiangsu Province, covering 34,000 square meters. This facility is equipped with China's leading calendering machine, high-standard silicon coating machines, and PE coating machines, enabling independent production of raw materials like PVC calendering film and release paper.
Present
Industry Leadership and Innovation
Today, Hanker has developed into a fully-integrated enterprise with comprehensive capabilities across upstream, midstream, and downstream industrial chains. We hold over 65 invention and utility model patents, and our high-quality DPI products are sold to more than 80 countries worldwide.
Certifications & Quality Standards
National High-tech Enterprise
ISO9001 Quality Management
ISO14001 Environmental Management
Shanghai Contract-abiding Enterprise
Environmental Commitment
We actively uphold our environmental protection responsibilities by utilizing advanced RTO equipment, achieving a 99.9% waste gas treatment rate. We encourage full employee participation in environmental practices and support sustainable development through tangible actions.
Product Benefits
Operational benefits relative to consumable-based printing and single-use synthetic papers.
Consumable Elimination
Zero reliance on ink, toner, ribbons, or cleaning solutions over the product lifecycle.
Instant Write Speed
Image formation occurs within 2-5 seconds per label without drying or curing intervals.
Field Rewritability
Content may be updated at point of use without returning card or tag to centralized printing station.
Product Features
Layered construction and surface engineering enabling reversible optical switching.
- Protective Overcoat: Crosslinked acrylic topcoat resisting fingerprint oils and scuffing
- Static Dissipative: < 10^10 Ω surface resistivity for dust reduction
- Anti-Stick Layer: Prevents thermal head adhesion during high-speed printing
- Dielectric Stability: Consistent capacitance for RFID inlay integration
- Solvent Resistant: Withstands ethanol and isopropyl alcohol wiping for surface cleaning
- Adhesive Compatible: Printable backside accepts permanent or repositionable adhesives
Product Applications
Implementation scenarios where temporary imaging and frequent data rotation are required.
Temporary Visitor Badges
Single-day or single-visit credentials issued at reception desks with on-demand thermal printers.
- Corporate HQ: Rewritable film inserted into clear PVC badge holders
- Conference Registration: Print name/affiliation, erase post-event
Electronic Shelf Labels
Grocery and retail price tags updated centrally or via handheld thermal writers.
- Promotional Pricing: Temporary discounts printed over base price field
Laboratory Slide Labeling
Freezer-safe labels for specimen tracking through thaw/freeze cycles.
- Cryo-storage: Maintains image contrast at -20°C
Returnable Container Tracking
Totes and pallets labeled with destination data, erased and rewritten for reverse logistics.
- Automotive Supply Chain: Kanban card replacement
Printer Compatibility
| Printer Type | Compatibility | Required Settings | Typical Speed |
|---|---|---|---|
| Direct Thermal (Zebra, Sato) | Yes (203/300 DPI) | Energy setting 12-16 | 2"-4"/sec |
| Thermal Transfer | No (ribbon required) | N/A | N/A |
| Laser Jet | No (fuser damage) | N/A | N/A |
| Dot Matrix | Yes (pressure imaging) | Heavy impact setting | Low |
Writing Best Practices
Ambient Temperature
Ideal imaging range 15°C-30°C. Cold film requires increased print energy; hot film may exhibit background fog.
Pressure Sensitivity
Film images under point pressure >5 N/mm². Avoid fingernail contact before use; store with interleaving.
Head Cleaning
Thermal printer heads require cleaning every 1,000 cycles. Dust accumulation causes non-imaging streaks.
UV Exposure
Prolonged direct sunlight (> 4h/day) may cause unintended erasure. Use UV-filtering overlays for outdoor applications.
Frequently Asked Questions
Common technical inquiries regarding imaging permanence, equipment requirements, and cycle limits.
How long does the written image remain visible?
Under office ambient conditions (23°C/50%RH, no direct UV), image contrast remains >80% of initial value for 12 months. Elevated temperatures (>35°C) accelerate reverse transition; written media should not be left on vehicle dashboards.
Can the film be written on both sides?
Standard construction is single-sided coating. Writing on the uncoated back side yields low contrast. Double-sided coated versions are manufactured for specific ID card applications but exhibit reduced total transmission.
What causes incomplete erasure?
Insufficient heat (temperature <105°C), insufficient dwell time, or non-uniform roller pressure. Older film (> 400 cycles) may require 5°C-10°C higher erasure temperature due to polymer relaxation.
Is the material compatible with RFID inlays?
Yes. The coating is non-metallic and does not detune HF (13.56 MHz) or UHF antennas. For embedded inlays, specify 188µm carrier to prevent read range degradation from hand capacitance.
Can I laminate this film to PVC cards?
Low-temperature lamination (<100°C) using pressure-sensitive adhesives is acceptable. Thermal lamination >110°C will erase any existing image and may permanently degrade the rewritable coating.
Interested in DPI Color Cutting Vinyl?
As a direct manufacturer with over 20 years of experience, Shanghai Hanker Industrial offers competitive pricing, flexible order quantities, and comprehensive technical support for our DPI brand products.
