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Light Weight Auto Promotes Plastic Industry
Posted: 05/03/2016 05:47:38  Hits: 62
Auto industry development is indispensable with plastic industry. In recent years, light weight has already become the main development direction of auto materials. Light weight provides a capacious prospect to plastic industry to develop. Experts explain that the usage of plastic has become an important factor measuring the design and manufacturing level of auto in developed countries. The weight of common auto parts is reduced by per 1%, which can reduce fuel consumption by 1%. The weight of moving parts is reduced by per 1%, which can reduce fuel consumption by 2%. The weight of auto has already been decreased by 20%~26%, compared with past. It is predicted that in the next 10 years. The weight of auto will continue being decreased by 20%. The application of plastic on auto realizes light weight.

It is known that application of plastic parts on auto was originated from 1950's. In 1959, Ford Motor was the first to use PVC on in auto manufacturing industry. In the midterm of 1960's, a small number of plastic parts had already started commercialized production. In 1970's, highly developing of synthetic resin industry made a firm foundation to the application of plastic on auto. Particularly in 1980's, rapid expansion of auto industry promoted auto materials to tightly focus on environmental protection, energy conservation, safety, comfort and low cost. At present the proportion of plastic account for 10%~15% of total auto weight. Proportions of other materials are steel about 65%~70%, aluminum 5%~10% and glass about 2%~4%.

In the past 30 years, the usage of plastic on auto has already been increased from 50kg~60kg per vehicle to current 150kg per vehicle. Moreover, the growth is still continuing. The high growth rate can be originated that the features of plastic meet the people’s requirements for auto.

Experts introduce that in terms of modern auto, external decorating parts, internal decorating parts and function parts are made of plastic. The application feature of external decoration parts is that plastic takes place of steel, reducing the weight of auto. The main parts include bumper, fender, wheel housing and guide plate. Internal decoration parts mainly contain instrument board, inner plate of car door, auxiliary fascia console, cover of glove compartment, seat and rear fender. Function parts include fuel tank, water chamber of radiator, cover of air filter and vanes of fan. At present, the usage of auto plastic accounts for 8%~10% of total plastic consumption in developed countries. In recent years, the largest categories of auto plastic – polypropylene grows rapidly at a growth rate of 2.2%~2.8% per year. It is estimated that the average usage of plastic will be higher than 500kg per vehicle in developed countries, by 2020.

Plastic is welcomed in auto materials due to several advantages
First, the largest advantage of auto plastic is to reduce the weight of auto. "Light weight is the objective in auto industry and plastic plays a key role in the aspect." Experts said, "The density of common plastic is 0.9~1.5. The density of fiber reinforced composite is not higher than 2.0. In terms of metal materials, the A3 steel is 7.6, brass 8.4 and aluminum 2.7%." So, plastic become prefer materials for light weight of auto.

Second, plastic is formed easily, convenient for making complicated parts. For example, instrument board is processed by using steel plate. Every part is processed firstly. Then, the parts are assembled or welded, having many processes. However, plastic is formed for just one time, having short processing time and ensuring precision.

Third, elastic deformation of plastic products can absorb large numbers of collision energy, having high buffer to the strong clash, protecting vehicle and auto. For this, instrument board and steering wheel are made of plastic to enhance buffer. Bumper, trim strip on auto are made of plastic, in order to reduce impact force of objects on car body. Besides, plastic also has function of absorbing or reducing vibration and noise, improving comfort.

Forth, plastic has high corrosion resistance. Damaged part cannot be corroded. However, steel parts can rust easily, if the paint is damaged or early corrosion prevention is carried out poorly. Plastic has higher corrosion resistance to acid, alkali and salt than steel plate. If plastic is used as car body covering parts, it is quite suitable used in the regions having serious pollution.

Forth, plastic has high corrosion resistance. Damaged part cannot be corroded. However, steel parts can rust easily, if the paint is damaged or early corrosion prevention is carried out poorly. Plastic has higher corrosion resistance to acid, alkali and salt than steel plate. If plastic is used as car body covering parts, it is quite suitable used in the regions having serious pollution.
 
Light Weight Auto Promotes Plastic Industry
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