Polyethylene is a high degree of crystallinity, non - polarity thermoplastic resin. The appearance of the original polyethylene is milky white, and in a certain degree, the thin section is translucent. PE has excellent resistance to most life and industrial chemicals.

Brief introduction

Polyethylene pipe is also known as high density polyethylene. Polyethylene is a high degree of crystallinity, non - polarity thermoplastic resin. The appearance of the original polyethylene is milky white, and in a certain degree, the thin section is translucent. PE has excellent resistance to most life and industrial chemicals. Some kinds of chemicals will produce chemical corrosion, such as corrosive oxidant (nitric acid), aromatic hydrocarbons (xylene) and halogenated hydrocarbons (carbon tetrachloride). The polymer does not absorb moisture and has good water vapor, which can be used for packing. PE has very good electrical properties, especially the high dielectric strength, which is suitable for wire and cable. In the high molecular weight class has an excellent impact resistance, in the normal temperature and even at low temperature -40F.

Injection blow molding is usually used to make smaller containers (less than 16oz), for the packaging of pharmaceuticals, cosmetics and shampoo. One advantage of this process is that the production of the bottle automatically goes to the edge of the corner, and it is not necessary for the process of the general blow molding. Although there are some narrow MWD grade is used to improve the surface finish, generally used to wide width MWD grade.

Injection: polyethylene have numerous applications, ranging from repeated use of the thin-walled drink cup to tank 5gsl, domestic production of polyethylene / 5. Injection molding grade general melt index 5 to 10, with toughness is low, liquidity grade and processing of higher mobility of the grade. Uses include daily necessities and food and thin wall packaging; a ductile, durable food and paint tank; high resistance to environmental stress cracking applications, such as small engine fuel tanks and 90 - gal garbage cans.

Using this processing method: plastic material generally is crushed into powder, and the melt flow during thermal cycling. The use of two types of PE: general rotational and cross linkable class. General purpose MDPE/ polyethylene is usually density range from 0.935 to 0.945g/CC, with a narrow MWD, so that the product has a high impact and minimum warping, its melt index range is generally 3 - 8. The higher MI grades are usually not applicable, because they do not have the impact of plastic products of hope and resistance to environmental stress cracking.

The unique properties of high performance rotational application system using its chemical crosslinking grade. These grades in the first paragraph of the molding cycle, good fluidity and crosslinked to form a its excellent resistance to environment should stress cracking resistance, toughness. Abrasion resistance and climate resistance. PE only suitable for large containers, ranging from 500 - gal transport of various chemical tanks to 20000 - gal farm.

Film: polyethylene film processing generally use film processing or flat extrusion processing method. Most PE for thin films, general purpose low density polyethylene (LDPE) or linear low density polyethylene (LLDPE) are available. HDPE thin film grade is generally used to require superior tensile properties and excellent anti - seepage properties. For example, the polyethylene film is commonly used in commodity, grocery bags and food packaging.
Technology
Polyethylene plastic pipe is mainly divided into two major categories: high density polyethylene HDPE (low pressure polyethylene) and low density polyethylene LDPE (high pressure polyethylene). PE
Pipe
Material is very broad application, pipe field is an important aspect of the field of polyethylene application. Because of the difference in physical properties between HDPE and LDPE, the two materials are different in the application field of pipe: low density polyethylene (LDPE) has good flexibility. However, with low compressive compressive strength, so can only be used for low pressure of small diameter pipe. It is often made of coil for rural drinking water supply and some non long-term use of occasions. And high density polyethylene (HDPE) is widely used in the field of pressure pipe (PE100) due to its better compression performance. PE80 popular explanation is: the material pipe at 20, continuous pressure for 50 years without failure, the wall of the tube to bear the minimum requirements of strength is: 80MPa, and so on. At the beginning of the development of plastic pipe, the use of polyethylene pressure pipe is far less than that of PVC, high performance, high strength polyethylene pipe. With the emergence of new materials and new technologies, the cost (weight) of the difference has been greatly changed, with the emergence of the second generation of polyethylene pipe material (equivalent to PE80) and the HDPE (equivalent to PE100), the same diameter of the same pressure grade and condition, the same length of polyethylene pipe weight is only 93% of UPVC pipe weight. Therefore, the second generation and third generation of polyethylene pipe material not only significantly increased the minimum requirements of PE, but also increased the resistance to environmental stress cracking performance, with a significant increase in resistance to crack growth, more important is to reduce the wall thickness in the same use pressure, increase the transport section. And under the same wall thickness to increase the pressure to improve the transport capacity (for example: in the same wall thickness of natural gas transport, the use of PE100 polyethylene pipe conveying pressure can reach 10 bar, with PE80 polyethylene pipe conveying pressure can only reach 8 bar). With the improvement of the technology of polyethylene, the economic benefit is. Recently reported that the fourth generation of polyethylene pipe material PE125 has been developed successfully, which can be predicted that the larger diameter, more economical polyethylene pressure pipe is more widely used in the field.
2 performance characteristic editor
A good pipeline, not only should have a good economy, and should have the interface stability and reliability, material impact resistance, cracking resistance, aging resistance, corrosion resistance and a series of advantages, compared with the traditional pipe, HDPE pipe system has the following advantages:
Reliable connection: polyethylene pipe systems connected by the electric melting method, the joint strength is higher than the strength of pipeline.
The low temperature impact resistance: low temperature embrittlement of polyethylene, can be safely used in the temperature range of -60-60 DEG C. Winter construction, due to the impact of the material is good, will not occur the pipe brittle crack.
The anti stress cracking good: HDPE has a low notch sensitivity, high shear strength and excellent anti scratch ability, resistance to environmental stress cracking performance is also very prominent.
The resistance to chemical corrosion resistance: HDPE pipe can withstand a variety of chemical medium corrosion, soil in the presence of chemicals are not likely to pipeline caused by any degradation. Polyethylene is an electrical insulator, so it will not decay, rust or corrosion, and it will not promote the growth of algae, bacteria, or fungi.
The resistance to aging, the use of long life: containing 2-2.5% of the uniform distribution of carbon black polyethylene pipe can in the outdoor open storage or use 50 years, will not suffer due to ultraviolet radiation and damage.
Good resistance to abrasion: experiments show that the wear resistance of HDPE pipe and steel pipe, the wear resistance of HDPE pipeline steel for 4 times. In the mud conveying field, the HDPE pipe has better wear resistance than that of the steel pipe, which means that the HDPE pipeline has longer service life and better economic performance.
, good flexibility: the HDPE pipe flexibility makes it easy to bend, the project can be by changing the pipeline to bypass obstacles, on many occasions, the pipeline flexible can reduce the amount of pipe fittings and reduce the cost of installation.
Small flow resistance: HDPE pipe has a smooth inner surface, the Manning coefficient of 0.009. The smooth and non - adhesive characteristics of the HDPE pipeline can ensure that the pipeline has a higher transport capacity, but also reduces the pressure loss and water consumption.
BBP convenient transportation: HDPE pipe than concrete pipes, galvanized steel pipe and steel pipe lighter, easier handling and installation of it, lower the demand for manpower and equipment means the installation cost of the project is greatly reduced.
Asha a variety of new construction methods: HDPE pipe has a variety of construction techniques, in addition to the traditional excavation method can be used for the construction, using a variety of new non excavation technology for construction such as pipe jacking, directional drilling, liner, crack pipes, such as mode, which for some sites do not allow excavation is the only option, so the application field of HDPE pipeline more widely.
3 product features editor
- good health performance: PE pipe processing does not add heavy metal salt stabilizer, material non-toxic, no fouling layer, no bacterium, well solve the secondary pollution of drinking water in the city.
Corrosion resistance - excellent: except for a few strong oxidant, can withstand a variety of chemical erosion medium; no electrochemical corrosion.
Life - long: at the rated temperature and pressure conditions, PE pipe can be used for over 50 years.
Good shock resistance: PE pipe - good toughness, high impact strength, heavy direct pressure