TPE Injection Molding
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TPE injection molding is a highly efficient manufacturing process used to produce durable, flexible, and high-performance parts for a wide range of industries.
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What is TPE Plastic?
TPE (Thermoplastic Elastomer) is a versatile class of materials that combines the properties of thermoplastics and elastomers. It offers the flexibility and elasticity of rubber with the processability and recyclability of plastics.
TPE is widely used in various industries due to its unique characteristics, making it an ideal material for applications requiring soft-touch, durability, and flexibility.
Description
Full Name
Thermoplastic Elastomers
Process
Finishing options
Mold texturing，Pad printing，Laser engraving，Bead Blasting
Hardness
85 Shore D
Prices
$$
Features
Appearance
Cream, White, Beige or Translucent
Strengths
Good Scratch Resistance, High Gloss, Strong toughness
Tensile Strength
50.0 – 11600 psi
Elongation at Break
3.8 – 900 %
Density
0.930 – 1.68 g/㎤
Advantages of TPE Injection Molding
Flexibility and Soft-Touch Feel
TPE parts are soft, flexible, and comfortable to the touch, making them ideal for consumer products and medical devices.
Durability
TPE is resistant to wear, tear, and environmental factors like UV radiation and chemicals.
Ease of Processing
TPE can be processed using standard injection molding equipment, reducing production costs and lead times.
Design Freedom
TPE allows for complex geometries, thin walls, and intricate details.
Recyclability
TPE is recyclable, making it an eco-friendly choice for sustainable manufacturing.
Applications of TPE Injection Molding
TPE Injection Molding Material Properties
TPE Plastic Properties
Value
Tensile Strength （MPa）
0.345 - 80.0
Flexural Modulus（GPa）
0.0180 - 0.0680
Drying Temperature（℃）
60–70
Drying Time（hr）
2
Mold Temperature（℃）
45～70
Scrap Quantity（mm）
2～8
Back Pressure（MPa）
40
Clamping Force（ton/in2）
2～2.5
Return Speed (rpm)
70～100
Shrinkage
1% to 2%
TPE 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 TPE grade.
Draft Angles
- Purpose: Facilitate easy ejection of the part from the mold.
- Recommended Draft: 1° to 3° for most TPE parts.
Radii and Corners
- Purpose: Avoid sharp corners to reduce stress concentrations and improve flow.
- Recommended Radius: Minimum 0.5 mm for internal and external corners.
Undercuts
- Avoid: Undercuts complicate mold design and part ejection.
- Solution: Use collapsible cores, side actions, or redesign the part to eliminate undercuts.
Shrinkage
- Factor: TPE typically shrinks 1% to 2% during cooling.
- Compensation: Account for shrinkage in mold design to ensure dimensional accuracy.
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