MD/NBR/SBR/PB/PE/EVA Recycling Machine Application:

Footwear manufacturing foam scrap. Shoe sole manufacturers and footwear component producers generate EVA and MD foam offcuts from injection moulding, compression moulding, and skiving operations. The WRFP-200 processes these offcuts directly — no size reduction step required — and returns ground powder to the compound mix at 20–30% addition in the same production shift.

Foam sheet production trim waste. SBR, PE, and NBR foam sheet manufacturers generate consistent edge trim and off-specification sheet from the slitting and cutting stage. The WRFP-200 handles these as-produced without pre-shredding, producing powder at 80–120 mesh for reintroduction into new foam sheet compound.

Rubber foam and sponge recycling. RB (rubber foam) and NBR sponge from sealing and insulation component manufacturing is ground to powder for use as a secondary filler in new rubber compound formulations, reducing dependence on virgin rubber and filler materials.

MD/NBR/SBR/PB/PE/EVA Recycling Machine Description:

The WRFP-200 is a high-speed water-cooled grinding wheel machine designed specifically for rubber and plastic foam waste — a fundamentally different mechanism from the disc-type PNMF pulverisers used for solid plastic granules. The key operational difference: foam scrap is fed directly into the WRFP-200 without pre-crushing. Shoe sole offcuts, foam sheet trim, sponge blocks, and moulded foam rejects go in whole; 80–120 mesh powder comes out at 120–180 kg/h, at a processing temperature of approximately 60°C.

Why 60°C matters. Traditional foam recycling via crusher and rubber mixer generates temperatures of 160°C or above during the mixing stage. At this temperature, the foam material’s crosslinked polymer structure is partially degraded, reducing the recycled powder’s mechanical properties and limiting the addition ratio to approximately 10% of the total compound. The WRFP-200’s water-cooled grinding wheel keeps processing temperature at approximately 60°C, preserving the material’s crosslink structure. This allows the recycled powder to be added at 20–30% of the new compound — three times the addition ratio of the traditional method — without affecting product performance or appearance.

Six supported foam materials. The WRFP-200 handles EVA shoe material foam (high-pressure secondary moulded products), MD foam soles, SBR foam sheet, rubber foam (RB), PE foam, and NBR sponge. These are the primary foam scrap materials generated in footwear manufacturing and foam sheet production. Output powder from each material is suitable for direct reintroduction into the corresponding foam compound formulation.

Recycling Style Comparison Between Traditional Recycling Style And Eva Pulverizer Machine:

Traditionally, scrap recycling involves crushing the materials with a crusher and then mixing them into flakes with a rubber mixer. However, this process is not very efficient and can result in high temperature extrusion and reduced recovery rates. The new type of grinding mill used in the EVA pulverizer machine solves these issues. It features a high-speed, water-cooled integrated grinding wheel with a main motor of 45KW. This machine can work continuously for 24 hours and can be operated by one person. It directly grinds the leftover materials into powder, with a mesh size of 80-120 mesh and close to normal temperature (60 degrees). This ensures that the physical properties of the ground powder are not destroyed.

One of the advantages of the MD/NBR/SBR/PB/PE/EVA recycling machine is its ability to add more powder in each batch of materials. This results in a higher addition ratio (20-30% compared to new materials) and allows for an increase of 3-5 mm per bed in the thickness of the foamed sheet. The ground powder also has a higher density and no color difference. Additionally, using the MD/NBR/SBR/PB/PE/EVA recycling machine shortens the mixing time and reduces the likelihood of the mixing shaft breaking. These benefits greatly increase the output and can generate profits of more than 200 USD  for the company every day.

MD/NBR/SBR/PB/PE/EVA Recycling Machine Feature:

• Direct foam grinding — no pre-crushing required — foam scrap (shoe soles, foam sheet offcuts, sponge blocks) feeds directly into the grinding chamber without a primary crusher step. Reduces equipment investment, floor space, and operator requirements compared to the traditional two-machine process.
• 60°C output temperature — water-cooled high-speed grinding wheel maintains processing temperature at approximately 60°C, preserving the crosslinked polymer structure of EVA and rubber foam. Enables 20–30% recycled powder addition versus 10% maximum achievable with the high-temperature traditional open-mill process.
• 80–120 mesh output — consistent fine powder suitable for direct reintroduction into foam compound formulation. Automatic return of coarse material to the grinding wheel maintains output consistency.
• Single-operator, 24-hour continuous operation — the WRFP-200 replaces a three-person traditional line with a one-person operation, running continuously without batch cycling. PLC control with frequency converter manages feed rate and grinding speed.
• Chiller + pulse dust collector required accessories — the chiller maintains cooling water temperature for the grinding wheel; the pulse dust collector captures fine foam dust generated during grinding. Both are required for optimal performance and workshop air quality. WANROOETECH supplies both as matched accessories.
• Adjustable feed inlet with drive wheel — the extending feed inlet with drive roller feeds foam scrap of varying sizes and shapes into the grinding zone; the silencer reduces operational noise level for the workshop environment.

Frequently Asked Questions

Why doesn’t this machine need a crusher before grinding foam scrap?

Standard plastic granule pulverisers (disc-type PNMF) require input material to be pre-reduced to ≤3 mm because the disc gap mechanism can only accept small, uniformly-sized particles. The WRFP-200 uses a high-speed rotating grinding wheel rather than a disc gap — foam scrap is fed against the wheel surface and abraded progressively into fine particles. Foam materials (EVA, SBR, NBR, PE foam) are compressible and low-density, so even large-format scrap (shoe sole offcuts, sheet trim) can be fed directly against the wheel surface without needing prior size reduction. This is the fundamental operating difference between the WRFP-200 and a disc-type EVA pulveriser.

Why does a 60°C processing temperature allow a higher recycled powder addition ratio than the traditional open-mill method?

EVA and rubber foam materials are crosslinked polymers — their foam structure and mechanical properties depend on the integrity of the crosslink network established during the original moulding or foaming process. The traditional open-mill recycling process exposes material to temperatures of 160°C or above, which degrades these crosslinks and reduces the recycled powder’s mechanical contribution to the new compound. As a result, open-mill recycled powder can only be added at approximately 10% of the total formulation before mechanical properties decline unacceptably. The WRFP-200’s 60°C processing temperature preserves the crosslink structure intact, producing recycled powder that behaves more like virgin material in the compound. This allows 20–30% addition ratios without product performance impact — tripling the material recovery value per tonne of foam scrap processed.

What foam scrap shapes and sizes can be fed directly into the machine?

The WRFP-200’s extending feed inlet with drive roller accepts foam scrap in a range of sizes and shapes — shoe sole offcuts (irregular moulded pieces), foam sheet strips (from slitting or cutting), and trimmed foam blocks. Large-format foam sheets or very thick moulded pieces may need to be cut to a size that fits the feed inlet opening before feeding. The drive wheel roller actively pulls material into the grinding zone, so operators do not need to apply force during feeding. Confirm maximum feed piece dimensions with WANROOETECH at the quotation stage based on your specific scrap geometry.

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