TPE Injection Molding
Services On Aria
TPU is a versatile material known for its exceptional elasticity, abrasion resistance, and toughness, making it ideal for applications that demand both performance and precision.
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What is TPU Plastic?
TPU (Thermoplastic Polyurethane) is a type of thermoplastic elastomer that combines the flexibility of rubber with the strength and processability of plastics.
It is widely used in applications requiring high durability, elasticity, and resistance to wear and tear.
Description
Full Name
Thermoplastic Polyurethane
Process
Finishing options
Mold texturing，Bead Blasting
Hardness (Shore A)
60A-90
Prices
$$$
Features
Appearance
Natural color
Water Absorption（%）
0.1-1.0
Abrasion Resistance
<40 mm³ (ISO4649 method)
Elongation at Break
300% – 700%
Density
1.21 g/㎤
Advantages of TPU Injection Molding
Flexibility
Produces parts with excellent elasticity and soft-touch feel.
Durability
Resistant to wear, tear, and environmental factors.
Design Freedom
Allows for complex geometries and intricate details.
Cost-Effective
Uses standard injection molding equipment and faster cycle times.
Sustainability
TPU is recyclable and eco-friendly.
Applications of TPU Injection Molding
TPU is used in a variety of industries due to its unique properties:
TPU Injection Molding Material Properties
TPU Plastic Properties
Value
Tensile Strength（MPa）
30 – 60
Drying Temperature（℃）
40–60
Drying Time（hr）
4
Mold Temperature（℃）
15.6 – 60.0
Melt Temperature（℃）
185 – 243
Injection Pressure（MPa）
20～110
Linear Mold Shrinkage
0.00040 – 0.0030 cm/cm
Nozzle Temperature (°C)
221 – 243
Clamping Force（ton/in2）
2～2.5
Dew Point
-40.0 – -17.8 °C
Shrinkage
0.4% to 0.9%
TPU Injection Molding Design Guide
Wall Thickness
- Uniformity: Maintain consistent wall thickness to avoid defects like warping, sink marks, or uneven cooling.
- Recommended Range: Typically 1.5 mm to 3 mm, depending on the part size and application.
- Thin Walls: Avoid walls thinner than 1 mm, as they may cause flow issues or incomplete filling.
- Thick Walls: Avoid walls thicker than 5 mm, as they can lead to longer cooling times and internal voids.
Draft Angles
- Purpose: Draft angles facilitate easy ejection of the part from the mold.
- Recommended Draft: 1° to 3° for most TPU parts.
- Deep Features: Increase draft angles for deeper features to prevent sticking or damage during ejection.
Radii and Corners
- Recommended Radius: Minimum 0.5 mm for internal and external corners.
- Benefits: Rounded corners enhance part strength and reduce the risk of cracking.
Shrinkage
- Factor: TPU typically shrinks 1% to 2% during cooling.
- Compensation: Account for shrinkage in mold design to ensure dimensional accuracy.
Ribs
- Height: Keep rib height less than 3 times the wall thickness.
- Thickness: Rib thickness should be 50% to 60% of the wall thickness.
Bosses
- Wall Thickness: Keep boss walls 60% to 80% of the main wall thickness.
- Support: Add ribs or gussets to reinforce bosses.
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