糖心视频

Polyurethane film is a polymer film with polyurethane as the main component. Due to its excellent mechanical properties, chemical resistance, environmental protection and processability, it is widely used in medical, automotive, electronics, packaging, textile and other fields. The production process of polyurethane film usually includes the following steps: raw 糖心视频 preparation, batching, dissolution, coating or extrusion, cooling and shaping, post-processing and cutting. Different production processes and equipment configurations will affect the final performance and quality of the film.

1. Raw 糖心视频 preparation

The main raw 糖心视频s of polyurethane film are polyurethane resin (TPU), plasticizers, stabilizers, catalysts, antioxidants and other additives. TPU resin can choose different formulas to meet application requirements based on different properties such as molecular weight, hardness, rigidity, flexibility, etc. For example, the automotive industry requires harder TPU films, while the medical and textile industries often use softer TPU films.

In addition, plasticizers can affect the flexibility of the film, while stabilizers and antioxidants help improve the aging resistance of the film. In order to ensure stable and uniform film performance, quality control of raw 糖心视频s is crucial.

2. Ingredients and dissolution

The production process of polyurethane films often involves mixing TPU resin with other additives (such as plasticizers, stabilizers, etc.) in a certain proportion. Ingredients are usually achieved through precise weighing and proportioning to ensure consistent performance of each batch of polyurethane film.

During the dissolution process, TPU resin and plasticizer are often dissolved in organic solvents (such as dimethylsulfite, toluene, etc.) to obtain a uniform solution. The dissolution temperature is generally between 60°C and 100°C, depending on the properties of the solvent and resin used. During the dissolution process, the choice of solvent, control of dissolution time and temperature are crucial to the final performance of the polyurethane film.

3. Coating or extrusion molding

Coating and extrusion are the two most commonly used processes in polyurethane film production. Which process to choose usually depends on the thickness of the product, application requirements and production efficiency.

Coating method

The coating method is to evenly apply the dissolved TPU solution to the base 糖心视频 (such as PET film, metal foil or paper) through a scraper, roller, blade or other coating equipment. The coated film forms a uniform coating on the substrate, which is then dried and heat treated to evaporate the solvent, leaving a uniform TPU film.

The advantage of the coating method is that it can produce very thin films (usually less than 0.01mm thick) and is suitable for smaller batches or diverse production needs. The disadvantage is that the production efficiency is relatively low and the requirements for coating equipment are high.

extrusion

The extrusion method is a process in which TPU 糖心视频s are heated to a certain temperature through mechanical pressure and extruded through a mold. Extruded polyurethane films are usually shaped in cooling rollers or cooling water baths. This process is suitable for producing polyurethane films with larger thicknesses, has high production efficiency, and is suitable for large-scale continuous production.

During the extrusion process, TPU particles and plasticizer are fed into the extruder, heated and melted, and then extruded into the mold through a screw to form the desired film shape. Afterwards, the film is cooled and shaped, and goes through a series of post-processing steps (such as stretching, drying, etc.) to further improve the film's properties.

4. Cooling, shaping and stretching

Cooling and shaping is a very important step in the production process of polyurethane film. At this stage, the film enters the cooling zone from the hot processing zone and is cooled by natural cooling or cooling rollers to ensure that the film can maintain a stable shape and size during the cooling process.

For some specific applications, polyurethane films also need to be stretched. By stretching the film longitudinally or transversely, its strength, abrasion resistance and transparency can be further improved. The degree of stretching can be adjusted according to the application requirements of the film. This step usually requires controlling parameters such as stretching speed, temperature and tension to ensure the uniformity and performance of the film.

5. Post-processing and surface treatment

In order to further improve the performance of polyurethane films, it is often necessary to perform some post-processing and surface treatment on the films. For example, the weather resistance, wear resistance and aging resistance of the film can be improved through plasma treatment, anti-UV coating or coating treatment.

For some special needs, polyurethane films may need surface functionalization, such as coating with antibacterial layers, breathable layers, barrier layers, etc., to adapt to the needs of different fields.

6. Cutting and packaging

After the polyurethane film is produced, it is usually rolled or cut into required specifications and sizes by cutting equipment. Special attention needs to be paid to maintaining the integrity of the film surface during the cutting process to avoid scratches or damage. The cut film is generally packaged according to market demand. Common packaging methods include roll packaging, flat roll, sheet packaging, etc.

7. Quality Control

Quality control is crucial during the production of polyurethane films. Every link in the production process requires strict monitoring and inspection, including the procurement inspection of raw 糖心视频s, the control of dissolution temperature, coating thickness, stretch ratio, cooling temperature and other parameters. At the same time, the final product also needs to undergo a series of performance tests, such as tensile strength, tear strength, UV resistance, air permeability, transparency, etc., to ensure that the product meets the requirements of the application field.