This section provides an overview for opp films as well as their applications and principles. Also, please take a look at the list of 9 opp film manufacturers and their company rankings.
Table of Contents
An OPP film is an abbreviation for oriented polypropylene film, which means biaxially oriented polypropylene film, and is called OPP film because it is manufactured by stretching PP film in two directions (longitudinal and transverse). It is used for packaging confectioneries because of its excellent transparency, rigidity, moisture-proof property, and printability.
On the other hand, it has the disadvantages of low heat sealability and tearing easily. In addition to OPP film, there is also non-stretched CPP film, which is used for retort packaging because of its superior heat sealability and tensile strength, although its transparency is inferior.
OPP films are widely used as packaging film for food and industrial applications due to its excellent properties. While OPP films are sometimes used by individually, they are also used as a highly practical film by laminating OPP and CPP films to compensate for each other's shortcomings. In many cases, OPP and CPP films are laminated (laminated together) to compensate for each other's shortcomings and used as highly practical films. Basically, the film is laminated so that the outside uses OPP film and the inside uses CPP film, achieving high transparency, moisture-proofing, and strength. It is an inexpensive film, but its firmness gives it a high-end appearance.
To begin with, let us explain how OPP films are manufactured: the raw material for OPP films is polypropylene, which is processed into a film-like CPP film. Generally, OPP film is manufactured through a two-step manufacturing process.
In the first stage, the film is stretched longitudinally. Next, the longitudinally stretched film is stretched horizontally to produce OPP films from CPP film. Because of this simple principle of just stretching the film by machine, no special machinery is required and production is inexpensive.
Next, we will explain what kind of property changes can be expected by stretching in a biaxial direction. Generally speaking, mechanical properties, thermal properties, optical properties, surface properties, and gas permeability will change. Specifically, tensile strength, heat and cold resistance, transparency, slip and printability, and moisture resistance are expected to improve. On the other hand, there are also disadvantages such as reduced heat sealability and a tendency to tear when a tear occurs. However, the tearability is rather convenient for packaging confectioneries, which can be opened without stress. Since different films have different characteristics, it is necessary to select the film to be used according to the contents to be packaged.
*Including some distributors, etc.
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