[Chemical Knowledge]：What material is PP film?

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This is a question that many people may have never heard of or have some understanding but are not very clear. PP film (Polypropylene film) is a kind of plastic film material based on polypropylene material. It is a film material widely used in packaging, printing, advertising, construction, medical, electronics and other fields. So, what are its characteristics? Let's start with the composition and manufacture of the material.

The basic composition and manufacturing
of PP film
PP film is a plastic film made of polypropylene, which is a polymer material. Polymeric materials can combine monomers (a monomer is a small molecule compound) into larger molecules through chemical reactions. In polymeric materials, monomers are typically combined into larger molecules by chemical chain reactions (e. g., thermal coincidence, free radical polymerization) or epoxidation reactions. Before the manufacture of PP film, the polymer is usually first made into particles (or called "particles" or "material"), and then through extrusion, stretching, embossing and other processes into a film.

the characteristics of PP films
films made of
PP films mainly include monolayer films and composite films. Single-layer films usually have the following characteristics:

1. Good mechanical properties: PP film has sufficient tensile strength, stiffness and hardness, while maintaining relative lightness.

2. Good optical properties: PP film has a smooth, transparent, bright appearance and excellent optical quality.

3. High thermal stability: PP film has excellent thermal stability and can be used in high temperature and high humidity environments.

4. air tightness: PP film has excellent air tightness performance, can effectively block the entry of foreign gas.

5. Chemical stability: PP film has good chemical stability and can resist the influence of chemical reaction.

6. Good processing performance: PP film has good processing performance and can be formed by extrusion, embossing, stretching and other processes.

At the same time, PP composite film also has the following characteristics:

1. Good heat sealability: PP composite film has good heat sealability and can be directly heat sealed at high temperatures.

2. Good processing performance: PP composite film has good processing performance, can be formed by coating, composite, printing and other processes.

3. High barrier properties: PP composite film has good barrier properties and can effectively block water, gas and light.