What is PET film?

What is PET film?

What is PET film? PET film is polyethylene terephthalate. Has excellent physical properties, heat resistance, chemical resistance and dimensional stability.

With the development of technology, PET film has also been widely used. Such as glass steel industry, building materials industry, printing industry, medicine and health, etc. In our life, many food, medicine and other packaging are made of PET film.

As a kind of PET product, PET film can be recycled many times. Recycled PET film can be used in food, beverage and personal care product containers. It can also be used in carpets, clothing, auto parts, building materials, industrial strapping and many other products.

The difference between PET and PET film

PET is polyester resin, which is a milky white or light yellow crystalline polymer. The full name of PET is polyethylene terephthalate, which is the most important variety of thermoplastic polyester.

PET has the advantages of smooth surface, rich luster, wear resistance, stable size, low wear, high hardness, good electrical insulation, low temperature resistance, non-toxicity, low water absorption, resistance to weak acids and organic solvents, etc. ,

PET is mainly used for fibers, and a small amount is used for films and engineering plastics. Among them, PET fiber is mainly used in the textile industry, and PET film is mainly used in electrical insulation materials.

PET film is made of PTA.

A typical PET film processing process is as follows:

1. Re-granulate the green sheet, master sheet and recycled material, and send them to each silo through the fan.
2. Then the materials are automatically batched and mixed according to the given ratio, and after mixing evenly, enter the pre-crystallizer for pre-crystallization.
3. After the raw material is pre-crystallized, it enters the drying tower for drying.
4. The dried raw material enters the extruder. The raw material is heated and melted in the extruder, passes through the metering pump, filter and adapter, and then reaches the die to form a thick sheet.
5. After the polyester melt flows out from the lip of the die head, it is pressed onto the quenching roller through the adsorption system, so that the casting sheet is cooled rapidly.
6. After the thick film is stretched by the longitudinal stretching machine, it enters the transverse stretching system for transverse stretching, and finally passes through the traction system to the winding system to wind up the large film roll.
7. Finally, cut, inspect, pack and store according to the customer's specifications.

PET film characteristics
1. Good mechanical properties, impact strength is 3 to 5 times that of other films, and good folding resistance.
2. Resistant to oil, fat, dilute acid, dilute alkali, and most solvents.
3. It has excellent high temperature resistance and low temperature resistance. PET film can be used in the temperature range of -70°C to 150°C with little effect on its mechanical properties.
4. Excellent gas, water, oil and odor barrier properties.
5. High transparency, can block ultraviolet rays, good gloss.
6. It is non-toxic, tasteless, hygienic and safe, and can be directly used in food packaging.

PET film application
PET film was first discovered in the late 1950s. Researchers have found a way to make PET film by stretching thin extruded PET film. At that time, the earliest applications of PET film were video, photographic and X-ray film and packaging film.

PET is an inert material, non-toxic, odorless and non-reactive with food. Therefore, PET film is also widely used in the packaging of food, beverage and medicine. PET film has also been proven to be very safe for use in food and beverages.

Of course, in addition to the above two applications, PET film is also widely used in the following fields:
ㆍHigh-end packaging materials such as textiles, precision instruments, electrical components, etc.;
ㆍSubstrates for audio tapes, video tapes, films, computer floppy disks, metal coatings, photosensitive films;
ㆍElectronic and mechanical fields such as electrical insulating materials, capacitor films, flexible printed circuit boards, and membrane switches.

PET film is available in hundreds of different thicknesses and coating combinations. The PET film has shown excellent performance in many fields.

We are a PET film supplier. If you are interested in our products, please feel free to contact us.