Why rCB Plants Are Shifting to 2-15kg EVA Low-Melt Packaging

The recovered Carbon Black (rCB) market is scaling rapidly. Driven by the net-zero carbon targets of major tire manufacturers and strict environmental regulations on end-of-life tires (ELTs), rCB has transitioned from an alternative option to a critical supply chain feedstock.

As pyrolysis plants globally expand their production capacities, a major operational hurdle remains: how to efficiently package, transport, and dose a material with such low bulk density and high dust levels?

The industry is actively moving away from 1-ton jumbo bags. The practical standard for rCB distribution is shifting to 2–15kg small-dose packaging. Here is the operational logic behind this shift, and how our VFFS packaging technology can optimize your rubber compounding workflow while lowering operational costs.

1. The Numbers Behind the rCB Expansion

The rCB industry is scaling to meet massive downstream demand. Handling higher throughput requires upgraded logistics:

• Market Volume Growth: According to 2026 industry data, global rCB volume is projected to grow from roughly 148.5 kilotons to over 893 kilotons by 2035, representing a 19.8% to 36.2% CAGR depending on regional adoption.
• Feedstock Supply: Over 1.6 billion tires reach end-of-life annually. In North America and Europe, greenfield pyrolysis mega-facilities are currently targeting steady-state capacities of 30,000 to 50,000 tons per year by 2028.
• OEM Mandates: Leading global tire manufacturers have committed to integrating 30% to 50% sustainable and recycled content into standard formulations within the next decade.

2. Why FIBC Jumbo Bags Slow Down Compounding

Historically, rCB has been shipped in 500kg to 1-ton FIBCs (jumbo bags). While functional for bulk transit, they create severe bottlenecks at the mixing stage:

• Dust Control Failures: rCB is notoriously fluffy and light. Discharging a jumbo bag into a Banbury mixer releases massive amounts of airborne dust, leading to factory hygiene issues, material waste, and potential HSE (Health, Safety, and Environment) violations.
• Inaccurate Dosing: Rubber compounding demands exact formulation weights. Drawing material from a bulk bag requires operators to manually scoop and weigh smaller batches, which introduces human error and slows down the cycle.

To eliminate these issues, high-tier rubber compounders now specify that rCB must be delivered pre-packaged in precise, 2kg to 15kg bags.

3. Direct Batch Inclusion via EVA Film

The demand for 2–15kg bags is driven by a specific handling method: Direct Batch Inclusion. Instead of slicing a bag open and dumping the dusty rCB, operators throw the entire sealed bag directly into the internal mixer. This is done using EVA (Ethylene Vinyl Acetate) low-melt film.

The Mechanics of EVA Low-Melt Film

EVA film is formulated to melt between 70°C and 110°C—well below the 130°C–150°C standard operating temperature of rubber internal mixers. When dropped into the mixer:

• The film melts completely and disperses uniformly into the rubber compound.
• It causes zero changes to the physical or chemical properties of the final product.
• It results in zero airborne dust, no material loss, and 100% accurate batch dosing.

The VFFS Bottleneck: Historically, plants had to buy costly pre-made EVA bags and fill them manually. Standard VFFS (Vertical Form Fill Seal) machines cannot process pure EVA film—it sticks to the sealing jaws, stretches out of tolerance, or fails to bond properly.

4. Adapting VFFS Lines for Pure EVA Film

Our engineering team has addressed this equipment gap. Our heavy-duty VFFS packaging lines are specifically modified to handle pure EVA roll film and manage the poor flow characteristics of rCB.

• Upgraded Sealing Integration: Standard VFFS jaws destroy low-melt film. Our upgraded temperature control and sealing module handles pure EVA flawlessly without sticking or deforming, finally enabling automated forming and filling for rubber-grade EVA bags.
• Micro-Venting Air Exhaust: rCB traps massive amounts of air, causing standard bags to inflate and leak during sealing. Our unique micro-venting setup forces air out rapidly during the high-speed fill cycle. The result is a flat, easily stackable bag without leaking a single gram of rCB dust.

5. The Financial Case: 6-Month ROI

Transitioning from manual pre-made bag filling to our automated VFFS roll-fed EVA system provides a straightforward financial return for pyrolysis plants:

• 30% Drop in Material Costs: Purchasing raw EVA film on rolls is structurally cheaper than buying pre-made bags from third-party fabricators.
• 70% Drop in Labor Costs: Unmanned forming, filling, degassing, and sealing replaces labor-intensive and hazardous manual packing stations.
• 6-Month Payback Period: Based on the combined reductions in consumables and labor overhead, most rCB facilities recover their machinery investment within 6 months.