Phone: +86-816-2295680
E-mail: sales@dongfang-insulation.com
Polyester Release Film — Core Product Lines
Our flagship polyester release film solutions are engineered for demanding environments, offering outstanding dimensional stability, surface uniformity, and release performance across key industrial applications.
What Is Polyester Release Film & Why It Matters
Polyester release film — primarily based on biaxially oriented polyethylene terephthalate (BOPET) — is a high-performance functional film with precisely engineered surface release coatings. It serves as a critical processing aid and protective carrier across a vast range of industrial and commercial manufacturing operations.
The global polyester release film market has experienced robust growth, driven by expanding demand in electronics, electric vehicles, flexible packaging, medical devices, and advanced composites. Industry analysts project the global release film market to surpass USD 2.8 billion by 2030, with polyester-based variants commanding the largest share owing to their superior thermal resistance, dimensional stability, and chemical inertness.
From protecting optical adhesives in display panels to enabling composite layup in aerospace manufacturing, polyester release films are indispensable to modern production lines that demand precision, consistency, and reliability at scale.
Key Applications of Polyester Release Film
Polyester release films are precision-engineered to meet the demanding requirements of diverse industrial sectors, delivering consistent peel force, thermal stability, and dimensional accuracy at every stage of production.
Optical & Display Electronics
In flat panel display (FPD) manufacturing, polyester release films serve as carrier and protective layers for optical clear adhesives (OCA), polarizers, and touch sensor modules. Low-haze, high-transmittance PET base films ensure zero optical defects during lamination, making them essential for OLED, LCD, and mini-LED panel production lines where sub-micron surface quality is non-negotiable.
Automotive & EV Manufacturing
The automotive sector increasingly relies on polyester release films for interior decoration films, paint protection film (PPF) production, and battery cell assembly in electric vehicles. PET films for automotive decoration deliver outstanding UV resistance and conformability, while silicone-coated release liners ensure clean peel during battery electrode stacking and solid-state electrolyte lamination processes.
Medical & Pharmaceutical
Polyester release films are critical in the production of transdermal drug delivery patches, wound dressings, and medical-grade adhesive assemblies. FDA-compliant release coatings with controlled and precise peel forces ensure drug integrity while maintaining sterile packaging requirements. Bio-compatible formulations meet stringent USP and ISO 10993 standards for patient-contact applications.
New Energy & Power Systems
In photovoltaic (solar) module production, polyester release films protect EVA and POE encapsulant sheets during lamination processes, preventing contamination and enabling efficient automated handling. For advanced energy storage, release films are used in lithium-ion battery separator manufacturing and supercapacitor electrode processes, supporting China's rapidly expanding clean energy infrastructure.
Aerospace & Advanced Composites
Carbon fiber reinforced polymer (CFRP) and glass fiber composite manufacturing employ polyester release films as process release plies and vacuum bagging components. These films withstand autoclave cure temperatures exceeding 180°C while providing clean, contamination-free release from tooling surfaces. Applications span aircraft structural panels, wind turbine blades, and next-generation satellite components.
Flexible Packaging & Labels
Self-adhesive label production, pressure-sensitive tape manufacturing, and flexible packaging converting operations use polyester release films as high-speed die-cutting liners. Superior dimensional stability reduces web tension variation on high-speed converting equipment, while consistent release values ensure reliable dispensing across automated labeling systems in food, beverage, and logistics industries.
Industry Trends & Development Outlook
The polyester release film industry is undergoing transformative change, driven by megatrends in electrification, sustainability, miniaturization, and intelligent manufacturing.
🔋 EV Battery Technology Acceleration
The explosive growth of electric vehicles globally — with EV penetration exceeding 30% in key markets — is creating unprecedented demand for ultra-thin, high-precision release films used in battery cell stack assembly, solid-state battery development, and thermal interface material processing. Manufacturers are investing heavily in narrower thickness tolerance films below 12μm for next-generation cell-to-pack architectures.
🌱 Sustainable & Bio-based Formulations
Environmental regulations in the EU and increasing ESG commitments from global manufacturers are driving R&D into bio-PET release films, solvent-free silicone coating processes, and recyclable liner programs. Leading producers are developing films with 30–50% bio-based content without compromising release performance, targeting circular economy certifications by 2026–2028.
📱 Foldable & Flexible Display Revolution
The emergence of foldable smartphones, rollable TVs, and flexible wearable devices demands release films with exceptional flexibility, ultra-low haze (below 0.3%), and zero orange-peel surface defects. This has spurred development of novel PET formulations with modified crystallinity profiles capable of withstanding repeated bending at radii below 3mm without delamination or optical distortion.
🏭 Smart Manufacturing Integration
Industry 4.0 adoption in precision film manufacturing is enabling real-time surface defect detection using AI-powered vision systems, inline coating weight monitoring, and predictive maintenance on biaxial stretching lines. These technological investments are reducing defect rates below 0.1 ppm and enabling production of specialty grades with tighter ±0.3μm thickness tolerances demanded by semiconductor and advanced display customers.
🛡️ High-Temperature Performance Demands
Aerospace, industrial lamination, and advanced composite manufacturing are pushing requirements for release films capable of sustained performance at 220–250°C process temperatures. Modified BOPET films with enhanced thermal dimensional stability (TD shrinkage below 0.3% at 200°C) and specialty fluoropolymer or silicone release coatings are gaining traction in autoclave processing, multi-layer PCB press operations, and high-performance adhesive tape production.
🌐 Localization & Supply Chain Resilience
Post-pandemic supply chain disruptions have accelerated regional manufacturing investment, with major display and EV battery manufacturers in China, Southeast Asia, Europe, and North America seeking qualified local release film suppliers. This trend is creating significant opportunities for vertically integrated producers offering both base film and coating capabilities with certified supply reliability programs and vendor-managed inventory solutions.
Engineering Excellence in Polyester Release Film Production
Precision from Polymer to Product
Manufacturing world-class polyester release films requires mastery across the entire value chain — from PET chip synthesis and melt extrusion through biaxial orientation, precision coating, slitting, and quality assurance. Sichuan EM Technology Co., Ltd. commands this full vertical integration, enabling unmatched consistency across functional PET chips including flame-retardant (FR PET) and anti-bacterial variants that differentiate performance in demanding applications.
The company's biaxial stretching lines achieve industry-leading thickness uniformity with ±1.5% tolerance control, while its in-house silicone and functional coating capabilities allow rapid development of application-specific release values ranging from 3 gf/in (ultra-light) to over 200 gf/in (controlled release) on the same base film substrate.
Multi-layer co-extrusion technology enables simultaneous optimization of surface roughness on both sides — a critical advantage for applications such as protective masking films for stainless steel surfaces, where one face requires controlled adhesion while the opposite maintains anti-static or anti-scratch properties.
As the National Insulation Material Engineering Technical Research Center in China, EMT's R&D team of 200+ engineers continuously advances film formulation, coating chemistry, and process technology to address the next generation of application requirements across our global customer base spanning new energy, smart grid, 5G communications, and panel display sectors.
Vision & Mission
To Become a World-renowned Innovative New Material Product and Service Supplier.
To Provide Safe and Environment-friendly New Material Solution for the Society, Create a Better New Life.
About Sichuan EM Technology Co., Ltd.
Sichuan EM Technology Co., Ltd., established in 1966 and headquartered in Mianyang, Sichuan, south-west part of China, as the 1st public company of electrical insulation material manufacturer in China and National Insulation Material Engineering Technical Research Center, we have comprehensive R&D and manufacturing capabilities to manufacture polyester films, halogen-free polycarbonate and polypropylene films, capacitor polypropylene films, rigid & flexible laminates, mica tapes, thermosetting composites, precision coating product, molding compounds (DMC, SMC), functional PET chips (FR PET chip, anti-bacterial PET chip, etc.), impregnating varnishes and wire enamels, PVB resin & interlayers, special resin (esp. for CCL), etc. We are certified by ISO9001, IATF16949:2016, ISO10012, OHSAS18001 and ISO14001.
We export to the worldwide markets in varied industries, including power generation equipment, UHV power transmission, smart grid, new energy, rail transportation, consumer electronics, 5G communication, and panel display. EMT has established long-term and stable cooperative partnerships with all our partners across the world, whilst providing strong supports in manufacturing services to original equipment manufacturers (OEMs).
Manufacturing Sites
EMT operates an extensive network of manufacturing bases across China, enabling responsive supply and localized technical support for our global customer base.
- Mianyang Site (Headquarters)
- Chengdu Site
- Meishan Base (est. 2024)
- Chengdu Second Headquarters (completed 2024)
- Sichuan EMT New Material Co., Ltd.
- Central China Site — Henan Huajia New Material Technology
- Eastern China Site — Jiangsu EMT New Material Co., Ltd.
- Shandong Dongrun New Material Co., Ltd.
- Shandong EMT New Material Co., Ltd.
- SNTON Optical Material (Shandong Shengtong Optical)
Group Structure
EMT operates through a diversified group of specialized subsidiaries, each focused on distinct material science domains to serve the full spectrum of advanced manufacturing requirements.
Milestone
Over five decades of innovation, expansion, and leadership in advanced material science.
2024
Meishan base established. Chengdu second headquarters officially completed.
2023
Shandong Aimonte awarded "Little Giant with Specialization, Specialization and Innovation" in Shandong Province. Aimonte Aviation awarded National Second-Class Confidentiality Qualification. Henan Huajia awarded "Gazelle" Enterprise in Henan Province.
2022
Established Chengdu Glenson Health Technology Co., Ltd., and Sichuan EM Technology (Chengdu) International Trading Co., Ltd.
2021
Established Sichuan EM Functional Film Materials & Technology Co. Ltd., and Sichuan EMT New Material Co., Ltd.
2020
Wholly-owned acquired Shandong Shengtong Optical Materials Technology Co., Ltd., and established Shandong EMT New Material Co., Ltd.
2018
Established EMT Chengdu New Material Co., Ltd., and Chengdu Drug and Cancer Pharmaceutical Technology Co., Ltd.
2015
Acquired 51% of total equity of Taihu Jinzhang Science & Technology Co., Ltd.
2014
Acquired 62.5% of total equity of Henan Huajia New Material Technology Co., Ltd.
2012
Established Jiangsu EMT New Material Co., Ltd.
2011
Listed on the Shanghai A-share market — the first electrical insulation materials industry listed company in China.
2007
Renamed Sichuan EM Technology Co., Ltd.
2005
Wholly-owned acquisition by Guangzhou Gaoking Group.
1994
Restructured into Sichuan Dongfang Insulation Materials Co., Ltd., and established Sichuan EM Enterprise Group Company.
1966
EMT's predecessor, state-owned Dongfang Insulation Material Factory relocated from Harbin to Sichuan.
Extended Polyester Release Film Application Portfolio
Explore our full range of advanced film, resin, and material solutions engineered for critical industrial and commercial applications worldwide.
