BOPET film is versatile and can be found in everything from your kitchen to outer space. It&#;s as ubiquitous as it is essential. Standing for Biaxially-oriented Polyethylene Terephthalate, BOPET is a shining star in the polymer universe, known for its strength, durability, and clarity.
But what makes BOPET unique, and how is it used in many different ways? Buckle up; we&#;re about to enter this material world&#;s heart. BOPET films are extensively used in packaging, especially for food, beverages, pharmaceuticals, cosmetics, and electronic products: their high mechanical strength, good transparency, and excellent resistance to the contents.
The following will introduce the specific applications of BOPET films across various industries, covering nearly all industry sectors.
As Packaging Materials
Printed Composite Films
Composite films are commonly used to enhance packaging effects and achieve complementary properties and sealing functions. They normally combine the BOPET thermal lamination film or BOPET gloss Film laminating with PE, CPP, BOPA, or EVOH films. Dry lamination, which bonds two or more substrates using a solvent-based adhesive, is the primary method for creating composite films.
The table below shows examples of the structure and application of BOPET composite films.
Packaged Goods
Laminated Film Structure
Food
Milk Powder
PET-AL/CPE
Coffee
PET/PVDC/PE
Tea
PET-AL/CPE
Hot Pickled Tuber Mustard&#;Salted Product
PET-AL/PE
Biscuits
B0PP/PET-AL/CPE
PET/CPE
Small Sausage&#;Lunch Meat
PET/PVDC/PE
Cheese
PET(127)/PE(50)
PET(127)/PVDC(25)/PE(50)
Semi-Finished Products
(vegetables, cold cuts, fish, etc.)
PET(127)/PE(50)
Liquid Soup
PET/PVDC/PE
Rice Cake
PET(12)/PE(50)
Cooking Food
PET/AL/HDPE
PET/HDPE
PET/CPP
Military Food
PET/PE&#;PET/AL/PE
Broad Bean
PET/PE
Non-food
Medical surgical equipment injection needle, etc
PET/PE
Vacuum Metallized Films
PET Aluminized films are produced by vacuum depositing a very thin layer of metal aluminum onto the surface of BOPET films through a unique process.
The processing occurs in a high vacuum, where heating melts and evaporates metal aluminum. The vapor is deposited on the BOPET film surface, forming a metallic aluminum foil layer, giving the film a metallic luster and significantly enhancing its barrier properties.
Therefore, aluminized films are widely used in packaging for food, pharmaceuticals, and chemical products, such as fast food, tea, coffee, milk powder, and cosmetics.
Electrochemical Aluminum (Hot Stamping Film)
Electrochemical aluminum hot stamping is a special printing process that does not require ink. It uses a template on a hot stamping machine to quickly transfer metal foil or pigment from the hot stamping foil to the product surface under specific pressure and temperature, forming images and text. This process is also colloquially known as hot stamping.
Heat Transfer Film
PET heat transfer films are specialized plastic films made from Polyethylene Terephthalate (PET), which is renowned for its strength, dimensional stability, and chemical resistance. These films are widely used in heat transfer to imprint designs onto various materials, including textiles, metals, and plastics, through a combination of heat and pressure.
PET heat transfer films come in different types to cater to specific applications, such as general-purpose, low-temperature, and high-strength films, as well as transparent and recyclable variants. The structure of a typical PET heat transfer film comprises several layers: the PET base material, a release layer, a printed pattern layer, and sometimes an adhesive layer for enhanced bonding with the substrate.
This technology offers a fast, efficient, and aesthetically pleasing method to decorate products, making it a popular choice in industries ranging from fashion and labeling to packaging and promotional goods. Its versatility and environmental friendliness, owing to its recyclability, underscore its growing preference in the market.
Laser Anti-Counterfeiting Film
In the production of laser holographic anti-counterfeiting films, patterns that can be displayed by laser are embossed on the PET film, followed by aluminum plating, mainly for anti-counterfeiting purposes, hence known as laser anti-counterfeiting filFor instance, holographic anti-counterfeiting labels can be found on internationally recognized bank credit cards, government-issued licenses, ID cards, driver&#;s licenses, passports, customs documents, certain national currencies, as well as clothing and electrical appliances from global brands.
Protective Card Film
Made from a PET film base, the surface is coated with a heat-sealable thermosetting adhesive, such as EVA. It is primarily used for protecting the surfaces of documents, files, photographs, and other items.
Heat Sealable Film
A heat-sealable co-polymer resin, such as PETG, is added to the outer layer of a triple-extruded PET film, giving it heat-sealing properties without the need for compositing with PE or CPP.
Heat Shrink Film
With the development of PET beverage bottles, the demand for PETG heat shrink film to create heat shrink labels for PET beverage bottles has increased. PETG heat shrink film, belonging to the polyester family like PET, is an environmentally friendly material. It is easily recyclable and reusable and does not pollute the environment, making it an ideal substitute for PVC.
The features of heat shrink film packaging include:
- Body-fitting transparency&#; highlighting the product&#;s appearance.
- Tight wrapping with excellent scatter prevention.
- Rain, moisture, and mold resistance.
- Irreversibility offers some anti-counterfeiting.
In addition to being used as shrink labels, PETG heat shrink film is also used in packaging for alcohol and cosmetics, with its demand expected to grow by 6~8% annually. In recent years, it has also been used for the outer packaging of daily-use products.
It protects packaged items from impact, rain, moisture, and rust and enhances user attraction through beautifully printed packaging, reflecting a positive image of the manufacturer. Currently, many packaging manufacturers opt for printed shrink films over traditional transparent films.
As Decorative Materials
Gold and Silver Threads
This material is made from a PET film base through vacuum aluminum plating and color coating. It is colorful and bright and is widely used in knitting, embroidery, crafts, and decorations.
Gold and silver threads are mainly used in clothing and textiles for embroidery, weaving, and fabric decoration, enhancing the aesthetic and uniqueness of the products.
In handicraft production, gold and silver threads create decorations such as jewelry, Christmas ornaments, and art pieces.
In some cultures, gold and silver threads have special symbolic meanings and are often used in traditional costumes and ceremonial items.
Glass Film
At present, glass films are mainly divided into three categories: architectural glass film, automotive glass film, and safety glass film.
Architectural glass films are primarily used for energy savings and have UV protection and safety features. They are generally between 25 and 38 micrometers thick and are divided into heat-reflective and low-emissivity films.
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- Heat-reflective films applied on the glass surface allow visible and near-infrared light to enter while blocking far-infrared light. This helps maintain sufficient indoor lighting, reflecting most of the solar heat, thereby controlling indoor temperature and reducing air conditioning load in summer to achieve energy savings.
- Low-emissivity films allow short-wave solar radiation to penetrate, enabling the absorption of solar heat by indoor objects and reflecting over 90% of the long-wave infrared rays to retain indoors. This type of film effectively utilizes solar energy and indoor long-wave radiation, particularly suitable for cold regions and heated buildings, achieving insulation and energy-saving effects.
Besides energy-saving and safety features, automotive glass films must also be highly transparent. When applied to car windshields, their visible light transmittance must exceed 70% to meet the national standard GB-.
Safety glass film is primarily used for explosion-proof safety and is commonly found in banks, jewelry store windows, and museums. It is highly transparent and has good impact resistance and UV-blocking abilities. Safety films are usually composed of single or multiple layers of PET, with thicknesses including 50, 100, 180, 280, and 380 micrometers.
As Electrical Engineering Materials
Insulation Materials
BOPET film, known for its excellent insulation and high-temperature resistance, is commonly used in the insulation layer of wires and cables, effectively isolating the current to ensure safe operation.
Motors and Transformers
BOPET film, insulating paper in motors and transformers, enhances the insulation performance of the equipment and reduces performance loss caused by electromagnetic interference.
Capacitor Manufacturing
BOPET film is widely used in capacitor manufacturing, especially in film capacitors, due to its high dielectric constant and low dielectric loss.
Flexible Printed Circuit Boards
In manufacturing Flexible Printed Circuit Boards (FPCBs), BOPET film supports substrates and insulation layers while maintaining lightness and flexibility.
LED Light Manufacturing
BOPET film is used to manufacture LED lights, isolating and protecting circuit boards, ensuring their heat resistance and stability.
As Photosensitive Material
Photographic Film Base
Traditional photography uses BOPET film as the base material for film rolls. Its strength and transparency ensure stability under light exposure, maintaining clear images.
Digital Printing Media
BOPET film is a photosensitive material in digital printing, creating high-quality print media suitable for outdoor advertising and high-resolution imagery.
Flat Panel Displays
BOPET film is a base layer in flat panel displays like LCD and OLED, providing mechanical stability and optical properties.
Photoresist Support Material
BOPET film is a support material for photoresists in semiconductor and microelectronics manufacturing, aiding in the formation of precise circuit patterns.
Medical Imaging Materials
BOPET film ensures clarity and stability in the production of X-ray films and other medical imaging materials.
As Magnetic Tape Base
Magnetic Tape Base Material
BOPET film is commonly used as the base material for magnetic tapes due to its high strength and good dimensional stability, fully meeting the critical requirements of tape manufacturing.
Data Storage
When magnetic tapes are used to store audio, video, and computer data, BOPET film provides robust and reliable support, ensuring long-term stable data storage.
Durability and Stability
BOPET film, with its chemical resistance, heat resistance, and tensile strength, ensures the durability and stability of magnetic tapes during long-term use and repeated playbacks.
High-Quality Audio and Video Recording
BOPET film, used as the base for magnetic tapes in professional audio and video recording, ensures high-quality recording due to its physical and chemical stability.
As Special Function Films
High Barrier Film
ALOx Coated BOPET film, with its exceptional gas and water vapor barrier properties, is widely used to enhance the shelf life and protection of food, pharmaceutical packaging, and sensitive electronic products.
Anti-static Film
BOPET film, with its special surface treatment or coating, effectively reduces static accumulation in anti-static film applications, protecting sensitive electronic devices from electrostatic damage and dust adhesion.
Flame Retardant Film
BOPET film, enhanced with special flame retardants or through processing techniques, improves fire resistance. It effectively slows the spread of flames in electronics, construction, and transportation, enhancing safety.
Antibacterial Film
BOPET film, with surface coatings or embedded antibacterial agents, provides antibacterial and anti-fouling properties and is widely used in areas requiring strict hygiene control, such as medical, food packaging, and public facilities.
Release Film
BOPET film&#;s smooth, non-stick surface makes it an ideal carrier for adhesives or other substances, easily released or removed during manufacturing or use.
Diffusion Film
BOPET film&#;s optical diffusion properties make it widely used in LED lighting and LCD screens. It evenly disperses light, enhancing lighting effects and visual experience.
Reflective Film
BOPET film, with its high reflectivity and weather resistance, is effectively used in solar panels, lighting, and decoration, reflecting light to increase energy efficiency and aesthetics.
Backsheet Film
The weather resistance and UV protection capabilities of BOPET film shield the cells from environmental impact, its high mechanical strength and chemical resistance ensure structural stability and its excellent electrical insulation characteristics enhance safety performance. Additionally, its reflective and light-transmitting properties further increase the energy conversion efficiency of solar cells, improving energy utilization efficiency and durability.
Wrapping Up
BOPET films, with their blend of durability, versatility, and sustainability, are indeed material for the modern age. From keeping our food fresh to powering our gadgets, they touch almost every aspect of our daily lives, often without us even realizing it. As we continue to innovate and seek sustainable solutions, BOPET films are poised to remain at the forefront of material science, lighting the way for a brighter, more sustainable future.
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