We all use products that are not made in the same way. This includes polyethylene and polyester film.
Most of us don’t even care about this kind of information. It needs to be available and manufactured!
If you're not part of the majority and would like to learn more, read this article!
Before we go into detail about the manufacturing process of polyethylene film, let's first look at its purpose. Where it's used.
Polyethylene is a kind of plastic. The thermoplastic polyethylene can be fused with liquid to form a solid and then reformed.
It is chemically synthesized by ethylene, a compound which is often made from oil or natural gases.
Polyethylene is one the most commonly used plastics.
Polyethylene melts and deforms at temperatures between 110 and 120 degrees C.
Polyethylene is a versatile material that has many unique properties. These include high impact resistance and flexibility as well as good workability and thermal/chemical stability.
Polyethylene is used to make packaging such as plastic bags or films, geomembranes (bottles), og svo framvegis.
The manufacturing process for polyethylene
Now let's discuss the manufacturing process for polyethylene.
Ethylene can be used in manufacturing. It is a gas, which can be liquidized at -104°C.
Ethylene goes through the polymerization step. Polymers are small particles that can be transformed into etherine. They look similar to grains. Hence comes polyethylene.
Polyethylene film is made
Now that we have an understanding of how polyethylene is made let's look at how polyethylene film is made.
Extrusion refers to the process of producing polyethylene films.
The process of making plastic films begins with the melting and molding of small plastic grains (known as resin).
The molten plastic is then "extruded", or pushed through a circular matrix to form continuous plastic tubes called bubbles.
The bubble is inflated with air to the desired volume and then pulled vertically upwards from the tower. It will cool down before being flattened.
The speed at the which the film was pulled from the mould controls the thickness. The volume of air in the bubble controls the film's thickness.
Add colored pigment to resin grains and you can alter the color of the film during melting.
This process allows for many different things to be done. On the polyethylene films, a printer might print instructions, notices, images, and company logos.
Separate the film to make individual bags. Ventilation holes can be added.
There are additional limitations in the polyethylene film manufacturing process.
If the film requires additional technical changes, the laminated material will be removed by the extrusion line. This is called offline conversion.
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