Several key knowledge points about TPU thin film!

Internationally mass-produced TPU film still has a large thickness error. In this case, if you want to win more market shares, advanced production lines with good measurement and control technology are needed.

Due to the poor control of the raw material ratio and reaction temperature of TPU film, many customers are dissatisfied and complain about the thickness error of TPU film products.

But here, I am still very responsible to say: the thickness of TPU film is really difficult to accurately control!

Since the tpu film manufacturer is an elastomer, after drying and dehumidifying, the film is extruded through the die after being mixed and matured by the screw. Any factors in between, including the instability of the raw materials, may cause uneven film thickness.

Generally speaking, the industry's saying is that it is normal for the thickness of 10 filaments of TPU film to have a positive or negative tolerance of 1 filament (0.01mm). Of course, this is also related to the thickness of the film. The thinner the TPU film can accept the smaller the thickness tolerance.

However, advanced testing equipment for TPU film manufacturers is often very expensive, so for many small and medium-sized TPU film manufacturers, controlling the thickness and scrap rate of the film is a headache.

In order to improve energy efficiency and reduce carbon emissions, the automotive industry is increasingly using lightweight materials, which is expected to promote the growth of the TPU film market. It can be used in the production of auto parts to help reduce body weight (about 40% reduction). At the same time, they can also replace the rubber components of the car.

Used in automotive applications such as doors and sound-absorbing panels, instruments and anti-vibration panels, seats and airbags. The replacement or after-sales market is expected to become the new focus of the automotive industry's demand for TPU films.

Consumers are now extremely sensitive to prices, and prices play an important role in the market. The price trend of TPU film market is 25% to 35% higher in Europe, North America and Asia Pacific.

How much is the high temperature resistance of tpu film?

Conventional TPU is generally said to be heat resistant to 80°C, which means that its long-term use temperature cannot exceed 80°C, otherwise the service life will be severely reduced. There are also heat-resistant TPUs, which are said to be able to withstand up to 130°C. There are also TPUs modified with glass fiber, which have a high heat-resistant temperature.

TPU film is a material containing -NH-COO- groups in the molecule. The long-chain glycol and isocyanate components constitute the soft segment, and the short-bonded diol and isocyanate components constitute the hard segment. Many characteristics of TPU depend on the long-chain two The type of alcohol, its hardness is adjusted by the ratio of hard segment, and the light aging property of TPU elastic band can be improved by adding light stabilizer

After all, it is plastic. The general temperature resistance is around 100℃, but if you need to work in a high temperature environment for a long time, you need special materials. Reinforced polyurethane has special high temperature and oil resistance, and is often used in automobile oil cups. Wait.

Generally speaking, if heat resistance is required, it is required for size measurement. The softening point of the card can be tested according to relevant standards. The global softening point is used to test the softening point of the asphalt pavement. It is usually used in TPU hot melt adhesives. The data measured by the capillary rheometer seems to have 4 values. The detection principle is only characterized by softening point and pour point under constant pressure, and testing the state of TPU at different temperatures. Thermodynamic properties of TPU.

TPU film forming and use

TPU films are mainly divided into the following types according to applications

1. Shoes

TPU is used in shoe materials mainly due to its excellent elasticity and wear resistance. TPU-containing footwear products are much more comfortable than ordinary footwear products in terms of wearing comfort. Therefore, they are more widely used in high-end footwear products, especially some sports shoes and casual shoes.

2. Film

TPU is increasingly popular with people because of its superior performance and environmental protection concept. At present, wherever PVC is used, TPU can become a substitute for PVC. TPU film can not only be laminated with various fabrics, but also can be vacuum thermoformed to produce products with clear contours and stable dimensions. With the continuous improvement of domestic environmental protection awareness, the application of TPU has become more and more extensive. Among the areas with a relatively fast increase: shoe upper linings, thermal underwear, transparent underwear, transparent shoulder straps, elastic bands and medical breathable tapes.

3. Adhesive

TPU adhesive is a kind of polyurethane adhesive. The use of polyurethane adhesives in Europe and the United States has been quite common, especially in the use of shoe adhesives, almost use polyurethane adhesives. The use of TPU adhesives in my country is to obtain polyurethane adhesives after TPU is dissolved and processed. In the use of TPU adhesives, the main areas are Guangdong, Fujian, Zhejiang, and Shanghai.

4. Hose

Because TPU hose has softness, good tensile strength, impact strength, high and low temperature resistance, TPU hose is widely used in China for air and oil transportation of aircraft, tanks, automobiles, motorcycles, machine tools and other mechanical equipment. hose. The main TPU hose manufacturers are concentrated in Guangdong, Zhejiang, Jiangsu, Shandong, Hebei and other places.

5. Wire

TPU provides tear resistance, abrasion resistance and bending characteristics, and high and low temperature resistance is the key to cable performance. Therefore, in the Chinese market, high-end cables, such as TPU for control cables and power cables, are used to protect the covering materials of complex cables, and their applications are becoming more and more extensive.

6. Scroll wheel

Polyurethane elastomer has a large number of applications on rollers due to its high mechanical strength, excellent wear resistance, excellent oil resistance, acid and alkali resistance, and outstanding compression resistance. There are mainly the following types of domestic rollers: industrial rollers, household rollers, sports equipment wheels, medical equipment wheels, and toy wheels.

7. Plastic modification

Can be used for PA and ABS plasticization, but the cost is higher

8. Ink

The main advantages of TPU ink are: excellent adhesion, low viscosity, good flexural resistance, excellent abrasion resistance, high gloss, weather resistance, and can resist any sun exposure including UV radiation. It has excellent toughness and durability in various application fields. The ink made of aromatic and aliphatic TPU can be used in various climates and environmental conditions, and the product has stable and outstanding performance.

TPU ink has a smooth appearance, good shading, alcohol resistance, and strong adhesion. It is mainly suitable for surface decoration of TPU and other plastics. Such as mobile phones, laptops, shoes, car leather chairs, sofas, high-end leather goods, handbags, inflatable entertainment TPU products, umbrellas, raincoats, etc.

TPU ink is used on metal and glass, with poor adhesion and easy paint peeling.