All You Need to Know about Food Film Packaging

March 02,2022

The so-called flexible packaging materials are packaging materials that can be deformed at will, such as glass, iron boxes, and wooden packaging, which are all hard packaging materials, and they cannot be deformed at will. The main types of flexible packaging materials are as follows:


Flexible Packaging Material,Laminated Material Thermal Sealing Film,Food Film Packaging


  • PE film. Polyethylene, more than 70% of the materials in flexible packaging are PE.
  • BOPP film. It is biaxially oriented polypropylene, which is used in a large amount in flexible packaging.
  • PET film. It is polyester film, used for printing and lamination.
  • CPP film. Cast polypropylene film with heat sealability.
  • PA film. It is also called nylon film, which has the advantage of high barrier properties.
  • PVDC film. It has high barrier properties and is generally used for the casing film of ham sausage.
  • PEN film. The performance is better than PET, but in view of the price, there is no large-scale application.
  • EVOH co-extruded film. High barrier film formed by co-extrusion of EVOH with PE and PP, etc.
  • Aluminized film. A high-barrier and bright film formed by aluminum plating on PET, BOPP, and CPP films.

In this blog, we mainly introduce food film packaging - BOPP film - heat sealing film.


What is laminated material thermal sealing film?


Thermal sealing film is a plastic film for heat sealing, which is one of the basic varieties of BOPP film, mainly used for printing, compound bag making or wrapping packaging. It is mainly divided into single-sided heat-sealing film and double-sided heat-sealing film.


  • Single-sided heat-sealing film: After printing the pattern on the non-heat-sealing layer, it is combined with PE, BOPP and aluminum foil to make bags, which are used for packaging of food, tea, and beverages.
  • Double-sided heat-sealing film: It is directly heat-sealed to package food, textiles, audio-visual products, poker, etc.


What are the properties of thermal sealing film?


All of the above require the film to have good heat-sealing properties. In addition, with the high speed of packaging, BOPP heat sealing film is also required to have high smoothness, low temperature instantaneous heat sealing performance and better heat sealing strength. In order to adapt to different types of packaging machines, the film is required to have a wider heat seal. Sealing temperature range (60 ~ 135 ℃).


At present, the initial heat-sealing temperature of BOPP heat-sealing film commonly used is above 100°C, and there are BOPP heat-sealing films with initial heat-sealing temperature below 90°C in foreign countries. Low initial heat-sealing temperature, suitable for high-speed packaging should be said to be a trend in the development of heat-sealing materials.


In the production of BOPP heat-sealing film, the selection of surface material is the key, including the type of heat-sealing material, production adaptability, heat-sealing temperature, heat-sealing layer thickness, heat-sealing strength, etc. At the same time, appropriate additives should be selected to improve other properties of the film, such as smoothness, antistatic properties, stiffness, optical properties, etc.


Last few words


In general, plastic film is the most widely used flexible packaging material. In order to enhance its processing and performance, some additives are often added in the production process, such as plasticizers, color masterbatches, and performance modifiers. The laminated material thermal sealing film has an irreplaceable role. We are a company that exports flexible packaging materials, any questions, please feel free to contact us.