PE (Polyethylene) Injection Molding Services On Aria
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What is PE lastic?
PE plastic stands for polyethylene plastic. It’s a widely used thermoplastic polymer made from the polymerization of ethylene.
PE plastics are known for their good chemical resistance, ease of processing, and relatively low cost. They can be processed through methods like injection molding, extrusion, and blow molding to create a wide variety of products.
Description
Full Name
Polyethylene
Process
Finishing options
Mold texturing，Pad printing，Laser engraving，Electroplating, Bead Blasting
Appearance
Translucent, Milky white, Black, Green, Red
Prices
$$
Features
Density
0.857-0.975 g/cm3
Strengths
Good Scratch Resistance, Low strength, Low water absorption, Ease of processing
Tensile Strength
4000 PSI
Elongation at Break
100%
Hardness
Rockwell R hardness of 60-70
Advantages of PE Injection Molding
There are many benefits derived from plastic molding, Some of the advantages of the material include:
Chemical Resistance
Polyethylene has excellent resistance to many chemicals. It can resist acids, bases, and salts to a certain extent.
Design Flexibility
PE’s good flow characteristics during the injection process allow it to fill intricate molds precisely.
HIgh Strength
PE products, especially HDPE molded ones, exhibit good strength and can withstand a certain amount of impact and stress.
Weather Resistance
PE has good weather resistance and can endure sunlight, rain, and temperature changes with little degradation.
Recyclability
Polyethylene is recyclable. At the end of a product’s life cycle, PE products can be recycled and remolded into new ones.
Polyethylene Subtypes and Thier Properties
Subtypes
Density (g/cm3)
Tensile Strength at Yield (MPa)
Rockwell Hardness (R)
Elongation at break (%)
Melt Temperature (°C)
Mold Temperature (°C)
HDPE
0.940
11-43
60-70
50.0 - 1100 %
135
20-60
LDPE
0.910-0.925
10–15
115
200% - 560%
115
20-60
LLDPE
0.918-0.935
10-30
105
200% - 1000%
123
50-80
UHMWPE
0.944-0.954
17-20
62-68
350% - 525%
136
130-135
MDPE
0.926 - 0.940
13.8 - 31.0
40-60
300% - 1000%
130
20-60
Applications of PE Injection Molding
PE Injection Molding Material Properties
PP Plastic Properties
Value
Tensile Strength（MPa）
2.69 - 60.7
Flexural Modulus（GPa）
0.152 - 2.21
Impact Resistance (Izod Impact, Notched)
2 to 10 ft-lb/in
Maximum Service Temperature（℃）
80
Chemical Formula
(C2H4)n
Glass Transition Temperature（℃）
120°C to -80°C
Heat Deflection Temperature（℃）
85
Drying Temperature（℃）
65～75
Drying Time（hr）
0.5
Mold Temperature（℃）
40～70
Melt Temperature（℃）
180～220
Injection Pressure（MPa）
80～130
Injection Speed（ mm/sec）
50–100
Cooling Time（S）
10～30
Scrap Quantity（mm）
3～10
Back Pressure（MPa）
７～18
Clamping Force（ton/in2）
2
Return Speed (rpm)
60～100
Shrinkage
1.5% to 5%
Polyethylene Injection Molding Design Guide
Wall Thickness
The recommended wall thickness for PE injection – molded parts typically ranges from 1mm to 6mm, depending on the size and application of the part.
Draft Angle
PE has a certain degree of elasticity and can adhere to the mold surfaces. A draft angle of at least 1 – 2 degrees is usually recommended for external surfaces and 0.5 – 1 degree for internal surfaces. Larger draft angles may be needed for parts with deep cavities or complex geometries.
Undercuts
Minimize the use of undercuts in the part design if possible. Undercuts can make the part difficult to eject from the mold and may require complex mold mechanisms such as side – action cores or lifters.
Temperature
The barrel temperature of the injection – molding machine for PE should be set according to the type of PE. For LDPE, the barrel temperature is usually around 160 – 260°C, while for HDPE, it’s around 180 – 280°C. A mold temperature in the range of 20 – 60°C is often used.
Injection Pressure and Speed
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