Introduction
TPR erasers have become one of the most popular PVC-free eraser options in the global stationery market. Known for their softness, flexibility, and child-safe properties, TPR (Thermoplastic Rubber) erasers are widely used in school supplies, promotional items, and custom-shaped erasers.
In this article, we will take you inside a professional eraser factory and explain how TPR erasers are manufactured, from raw material preparation to molding, cooling, printing, and final packaging.
If you are sourcing OEM/ODM erasers, this guide will help you understand the production process and choose the right manufacturer.
What Is TPR?
TPR stands for Thermoplastic Rubber, a flexible, non-toxic, and PVC-free material commonly used for high-quality erasers.
Key Features of TPR Material
- Soft and flexible
- Non-toxic & safe for children
- Excellent erasing performance
- Supports 2D/3D custom molds
- Environmentally friendly
- Suitable for bright colors and detailed shapes
Because of these advantages, TPR is now the No.1 choice for custom erasers, shaped erasers, promotional erasers, and school erasers.
👉 Looking for a reliable TPR eraser manufacturer? Contact our factory for custom colors, shapes, sizes, and packaging.
Email adress：ailingzhao98@gmail.com
WhatsAPP:+86 13917129061 OR https://wa.me/8613917129061
Step-by-Step Manufacturing Process of TPR Erasers
Below is the full production workflow inside a professional TPR eraser manufacturing factory.
1. Raw Material Preparation
The production process begins with carefully controlled raw materials.
TPR Formula Includes
- TPR base resin
- Softener
- Color masterbatch
- Additives to optimize softness & elasticity
The quality of TPR material directly affects the eraser’s performance—softness, durability, flexibility, and erasing ability.
Quality Control at This Stage
A professional factory will:
- Test raw material hardness
- Check color consistency
- Ensure all materials meet EN71, ASTM D4236, CPSIA and other safety standards
2. Mixing & Kneading
Once materials are prepared, they enter a kneading machine.
What Happens During Mixing?
- TPR resin and additives are heated
- Color masterbatch is evenly blended
- Materials become a soft, uniform compound
This ensures the final eraser has:
- Consistent color
- Smooth texture
- Stable hardness
3. Extrusion or Injection Molding
After mixing, factories use two main production methods depending on the eraser type.
Method A: Extrusion (Common for Simple Shapes and Bars)
The TPR compound goes through an extruder, which shapes it into:
- Square rods
- Round rods
- Long strips
Then workers cut the strips into the required eraser size.
Advantages
- Fast production speed
- Good for bulk orders
- Cost-effective
This method is widely used for school erasers, promotional erasers, and standard block erasers.
Method B: Injection Molding (Best for 3D Erasers)
For complex shapes or 3D designs, factories use injection molding machines.
How It Works
- The melted TPR material is injected into custom molds
- Each mold forms a detailed 2D or 3D shape
- Pressure ensures the shape is accurate
Advantages
- Complex 3D designs
- High precision
- Smooth details
This is the best method for:
- Cartoon erasers
- Custom logo shapes
- Fruit/animal erasers
- Gift/promo sets
4. Cooling & Demolding
After shaping, the erasers need to cool down:
Cooling Methods
- Natural cooling
- Water-cooling channels inside molds
Cooling ensures:
- The eraser retains its shape
- Surface smoothness
- Consistent hardness
Once cooled, the erasers are removed from the molds.
5. Trimming and Surface Finishing
Many erasers have slight edges or seams after demolding.
Finishing Steps
- Manual or automatic trimming
- Surface polishing
- Edge smoothing
This step ensures the erasers look clean and feel smooth in hand.
6. Printing (Optional but common for OEM orders)
Most branded erasers require LOGO printing.
Printing Options
- Pad Printing – best for logos and small designs
- Heat Transfer Printing – full-color artwork
- Silkscreen Printing – simple logos, single color
Factories perform quality checks to ensure:
- No smudging
- Clean lines
- Consistent positioning
7. Quality Inspection
A reliable factory performs QC checks throughout the process.
What QC Includes
- Hardness test
- Erasing performance test
- Color consistency
- Size accuracy
- Surface smoothness
- Safety compliance (EN71, ASTM, CPSIA)
8. Packaging
Erasers can be packaged in many ways depending on the client’s needs.
Common Packaging Styles
- OPP bag
- Blister card
- PVC box
- Paper card
- Bulk packing for wholesale
- Custom gift boxes for retail
The final step is carton packing and palletizing for export.
Benefits of Choosing a Professional TPR Eraser Factory
Working with an experienced OEM factory ensures:
1. Stable quality
Accurate color, softness, and erasing performance.
2. Flexible customization
Any shape, size, color, logo, or packaging.
3. Safety compliance
All materials pass international standards.
4. Faster lead times
Efficient mass production and strong supply capability.
5. Lower risk for importers
Professional QC reduces defects and product returns.
Conclusion
TPR erasers are one of the most versatile and safe eraser types on the market. By understanding how they are manufactured—from raw materials to molding, printing, and packaging—you can better evaluate factories and choose the right supplier for your business.
If you are looking for OEM/ODM custom eraser manufacturing, partnering with a professional factory ensures stable quality, faster delivery, and complete customization options.
👉 Looking for a reliable TPR eraser manufacturer? Contact our factory for custom colors, shapes, sizes, and packaging.
Email adress：ailingzhao98@gmail.com
WhatsAPP:+86 13917129061 OR https://wa.me/8613917129061
