Plastic film is a type of plastic product made by uniformly mixing polymer synthetic materials with other auxiliary materials in a certain proportion and processing them through plastic molding machinery. It has a certain thickness (usually between 0.01~0.25mm), width, and infinite length, with a flat, smooth, and soft surface. The following is a detailed explanation about plastic film:

1、 Definition and Characteristics

Definition: Plastic film is a thin film product made mainly from polymer synthetic materials such as polyethylene (PE), polypropylene (PP), polyester (PET), etc., through specific processes such as casting, extrusion, blow molding, etc.

Characteristics: Plastic film has the characteristics of cold resistance, high temperature resistance, good barrier properties, easy packaging, low cost, and recyclability. Different types of plastic films also have their own unique properties, such as transparency, glossiness, mechanical strength, chemical resistance, etc.

2、 Forming process

There are three main methods for forming plastic film: casting, extrusion, and blow molding

Casting method: producing a non stretched and non oriented flat extruded film through the melt flow quenching process.

Extrusion method: Common methods include uniaxial stretching and biaxial stretching. By stretching, the molecular chains are oriented and arranged in a plane parallel to the film, thereby improving the performance of the film.

Blow molding method: The material is plasticized and extruded to form a tube blank, which is then blown and molded, cooled, pulled, and coiled. Blow molded film has orientation, simple process, and low cost.

3、 Application Fields

The application fields of plastic film are very wide, covering almost all aspects of daily life:

Food packaging: used for preservation and refrigeration, extending the shelf life of food, maintaining food flavor and freshness.

Pharmaceutical packaging: used for packaging pills, powders, traditional Chinese medicine and other drugs to prevent drug corrosion and oxidation.

Daily necessities packaging: such as plastic bags, cling film, etc., used for moisture-proof, storage, and transportation of household daily necessities.

Architectural decoration: As a waterproof and thermal insulation material in decoration projects, it protects buildings from the effects of moisture and temperature changes.

In the field of agriculture, as plastic film, greenhouse film, etc., it can improve the yield and quality of crops.

In the field of electronics: used for the protection of electronic components, printed circuit boards, and packaging design of consumer electronics products.

4、 Environmental Protection and Sustainable Development

With the increasing awareness of environmental protection, biodegradable and recyclable plastic films have gradually become the new favorite of the market. These products can effectively reduce environmental pollution and carbon emissions during use, in line with the concept of sustainable development. At the same time, governments around the world are also introducing relevant policies and regulations to encourage and support the research and application of environmentally friendly plastic films.

In summary, plastic film, as an important plastic product, plays an irreplaceable role in modern society. With the continuous advancement of technology and the improvement of environmental awareness, its application fields will continue to expand, while also paying more attention to environmental protection and sustainable development.