What is Black Masterbatch? Production Process at US Masterbatch Factory
Black Masterbatch is one of the most widely used masterbatch products in the plastics industry. It is essential in film blowing, injection molding, extrusion, pipe production, fiber spinning, industrial packaging, and many other plastic applications. Thanks to its strong deep black color, high opacity, UV resistance, and excellent thermal stability, Black Masterbatch plays a key functional role in modern plastics manufacturing.
This article explains what Black Masterbatch is and provides a detailed look at the production process at US Group – a leading Vietnamese manufacturer supplying high-quality masterbatch to more than 80 countries.
1. What is Black Masterbatch?
Black Masterbatch is a concentrated black colorant made from three main components:
- Carbon Black – Determines deepness, opacity, UV resistance, and surface finish.
- Carrier Resin – PE, PP, or other polymers compatible with the final product.
- Additives – Improve dispersion, stability, and processability.
It is widely used to provide black coloration and functional properties to plastic products during processes such as blown film extrusion, injection molding, pipe extrusion, nonwoven production, and agricultural film manufacturing.
Compared to using raw carbon black powder directly, Black Masterbatch offers superior pigment dispersion, better process stability, cleaner production environments, and more consistent color performance. A well-formulated Black Masterbatch not only delivers deep, uniform black color but also enhances UV resistance, surface finish, mechanical strength, and weather durability of plastic products.
Because of these advantages, Black Masterbatch has become an essential material in modern plastic manufacturing across packaging, construction, agriculture, and industrial applications.
2. Key Quality Criteria of Black Masterbatch
A premium Black Masterbatch must achieve:
- Excellent dispersion of Carbon Black
- High opacity and gloss surface
- Stable thermal resistance during high-temperature processing
- Strong UV protection for outdoor products
- Optimal compatibility with the target resin
- Controlled MFI and moisture content
3. Production Process at US Masterbatch Factory
US Group follows a closed-loop, advanced manufacturing process designed for maximum dispersion and quality consistency.
Step 1: Raw Material Selection & Testing
Different grades of Carbon Black (N220, N330, N550, N660, etc.) are selected depending on application needs, from high-jetness to UV-stabilized and economical grades. Resin and additives undergo moisture testing, MFI checks, and compatibility evaluation.
Step 2: Accurate Weighing & Formulation
All ingredients are weighed precisely using an automatic batching system to ensure consistent color and performance across batches.
Step 3: Premixing & Internal Mixing (Banbury)
(This step includes the “internal mixing” process you requested.)
3.1. High-Speed Premixing
Resin, Carbon Black, and additives are blended to ensure preliminary distribution, reducing agglomeration and preparing the mixture for intensive mixing.
3.2. Internal Mixing / Banbury Mixing
A critical step for achieving high-quality Black Masterbatch:
- Materials are heated and kneaded inside a sealed mixing chamber
- Strong shear force breaks down Carbon Black agglomerates
- Ensures ultrafine dispersion at the micrometric level
- Improves color consistency, gloss, UV performance, and mechanical strength
This step is essential for premium grades used in films, fibers, and engineering applications.
Step 4: Melt Extrusion
The homogeneous mixture is fed into a twin-screw extruder where it melts, mixes thoroughly, and forms a stable compound with fully dispersed Carbon Black.
Step 5: Pelletizing – Cooling – Drying
- The molten strand is cut into uniform black pellets
- Cooled by air or water
- Dried to reduce moisture to below 0.1%
Step 6: Quality Testing & Packaging
Each batch is tested for:
- Opacity & dispersion level
- MFI, FPV
- Moisture content
- Tensile strength
- Compatibility with target applications
The product is then packed in 25kg bags or jumbo bags.
4. Applications of Black Masterbatch
- Garbage bags, HDPE – LDPE films
- Industrial packaging films
- PP non woven fabric
- Pipes and fittings
- Injection molded household goods
- PP woven fabric & strapping
- Outdoor products requiring UV resistance
- Technical and engineering components
5. US Masterbatch – A Reliable Supplier of Black Masterbatch Worldwide
US Masterbatch is a professional manufacturer of Color Masterbatch, Additive Masterbatch, and CaCO₃ Filler Masterbatch. With modern production lines, advanced testing equipment, and experienced technical engineers, US Masterbatch supplies high-performance masterbatch solutions to customers worldwide.
Our Black Masterbatch products are designed to meet the demanding requirements of applications such as blown film, pipes, nonwoven fabrics, agricultural films, and industrial containers. We offer customized formulations to match different resin systems, processing conditions, and end-use requirements. We provide:
- High-deepness, finely dispersed Black Masterbatch
- Customized formulations for different applications
- Technical support and product optimization
- Competitive pricing and fast global delivery
Thanks to strict quality control, stable supply capacity, and strong export experience, US Masterbatch has become a trusted partner for plastic manufacturers in many international markets.
6. Conclusion
Black Masterbatch plays a vital role in enhancing both the appearance and functional performance of plastic products. Choosing a reliable manufacturer with advanced production technology and strict quality standards is essential to achieving consistent results and long-term stability.
With its comprehensive manufacturing process, professional R&D team, and customer-oriented approach, US Masterbatch is committed to delivering high-quality Black Masterbatch solutions that support efficient production and sustainable growth in the global plastics industry.
