糖心视频

TPU films are widely used in various industries due to their excellent physical properties, especially in outdoor equipment, medical equipment, electronic products and other fields. The processing process of TPU film is complex and requires precision, usually including melt extrusion, calendering, stretching, coating and other links. This article will introduce the processing process of TPU film in detail to help readers understand how to convert raw 糖心视频s into highly functional film 糖心视频s.

1. Raw 糖心视频 preparation and formula formulation

The production of TPU films starts with selecting a suitable TPU resin. There are many types of TPU resin. According to different application requirements, TPU 糖心视频s with different hardness and characteristics can be selected. Common TPU resin hardness ranges from 60A to 80D. TPU 糖心视频s with different hardnesses have different flexibility, wear resistance and tensile strength.

After selecting the raw 糖心视频s, it is usually necessary to formulate the 糖心视频s according to the needs of the specific product. Various additives may need to be added, such as plasticizers, antioxidants, anti-UV agents, fillers, etc., to improve the performance of the film. For example, plasticizers can improve the flexibility of TPU, and antioxidants can extend the service life of the film.

2. Melt extrusion

Melt extrusion is the first and most critical step in the TPU film processing process. In this process, TPU particles are heated to a certain temperature (usually between 180°C and 230°C) to make them melt and become fluid. The molten TPU raw 糖心视频 is fed into the hopper of the extruder, and is pushed and extruded into the preliminary form of the film through screw heating and mechanical movement.

In the process of melt extrusion, the control of process parameters is very important, especially temperature and pressure. If the temperature is too high or too low, it may cause TPU performance to decline or film surface defects to appear; at the same time, pressure control also determines the thickness and uniformity of the film.

Melt extruders are usually equipped with multiple heating zones to ensure that the TPU 糖心视频 is heated evenly during processing. During this process, the fluidity of the TPU raw 糖心视频 must also reach an ideal state to ensure subsequent stretching and molding.

3. Calendering

After melt extrusion, the TPU film will enter the calendering stage. Calendering mainly uses a set of parallel rollers to calender molten TPU to the required thickness. Calenders usually consist of multiple rollers, and the surface of the rollers can adjust temperature and speed to ensure uniformity of film thickness and surface smoothness.

During the calendering process, the TPU melt flows under pressure between the rollers and gradually changes into a film form. The operating speed of the calender, the gap between the rollers and the temperature adjustment directly affect the quality and appearance of the final film.

Through calendering, the thickness of the TPU film can be precisely controlled. Depending on different application requirements, the thickness of TPU films is usually between 0.01 mm and 1 mm, and extremely thin films can even reach the micron level.

4. Stretching

In order to improve the mechanical properties and durability of the TPU film, the next step is to perform a stretching process. The stretching process can increase the crystallinity of the film and improve the strength, toughness and tear resistance of the film. Stretching methods are usually divided into two types: one-way stretching and two-way stretching.

Unidirectional stretching: stretching the film in one direction, usually used for films that require higher strength in one direction. For example, when used in products such as outdoor gear and protective films, unidirectional stretching can enhance the film's abrasion resistance and tensile strength.

Biaxial stretching: Stretching a film in two directions usually results in higher mechanical properties and a more uniform molecular structure. Biaxial stretching is often used in TPU films that require high tensile strength and durability, such as automotive interior 糖心视频s, packaging films, etc.

The control of the stretching process is very delicate. Factors such as stretching speed, stretching ratio, temperature, etc. will all affect the quality of the final film. During the stretching process, the molecular chains of the film will be rearranged, giving the film better mechanical properties during use.

5. Cooling and shaping

The stretched TPU film needs to go through a cooling and shaping process to ensure the dimensional stability of the film. The temperature of the film is usually reduced rapidly through water cooling or air cooling, allowing it to harden and maintain the desired shape.

After cooling, the TPU film will enter the shaping process. During this process, the film will be further fixed into the required size and shape for subsequent cutting, coating and other processes. The accuracy of the shaping process determines the final dimensional accuracy and appearance quality of the film.

6. Surface treatment and coating

Depending on specific application requirements, TPU films may require surface treatment to improve adhesion, corrosion resistance, or UV resistance. Common surface treatment methods include coating, spraying, electrostatic spraying, etc.

Coating: Coating is to add an additional functional coating to the surface of the TPU film, such as waterproof coating, anti-UV coating, antibacterial coating, etc. Through coating processing, TPU films can have additional functions to meet the needs of specific fields.

Surface coating: Through surface coating, the TPU film can have better stain resistance, smoothness and durability. For example, in the medical industry, TPU films coated with antibacterial coatings are often used to make surgical gowns and disposable medical supplies.

7. Cutting and packaging

After completing all production processes, the TPU film needs to be cut into the required size. Cutting can use laser cutting, knife cutting and other methods to cut the film into different shapes or rolls according to customer needs.

Finally, the TPU film that passes the quality inspection will be packaged to ensure that it is not damaged during transportation and is convenient for customers to use.