Lab Rotomolding Masterbatch Compounding Pulverizer Plastic Milling Machine Description:

The PNLP-200 is a laboratory-scale disc pulverizer designed for R&D departments, formulation laboratories, and university research facilities that need to produce small batches of plastic powder without relying on external lab services or scaling up to industrial-sized equipment.

At 1–25 kg/h output and a 203 mm disc diameter driven by a 3.75 kW motor, the PNLP-200 is sized for sample production: enough material for mould trials, colour matching runs, and formulation testing, with minimal material waste between trials. Input material must be pre-granulated to ≤3 mm before feeding.

Ambient and cryogenic operation. The PNLP-200 supports two cooling modes. In ambient mode, the standard water-and-air cooling system maintains disc temperature for thermoplastics that process well at room temperature (PE, PP, LLDPE, PVC, ABS). In cryogenic mode, liquid nitrogen is fed into the grinding chamber, enabling processing of elastic, heat-sensitive, or hard-to-grind materials (rubber, TPU, EVA, wax-based compounds) that deform rather than fracture at ambient temperature. Cryogenic mode also produces finer particle size distribution for the same gap setting — useful when trialling formulations that will eventually be produced on a cryogenic industrial machine.

Typical laboratory applications include: producing LLDPE or HDPE rotomolding trial powder before committing to a full production run, grinding masterbatch carrier resin samples for colour dispersion trials, producing compounding test batches for mechanical property testing, and generating pharmaceutical or food-grade powder samples requiring GMP-traceable processing.

Lab Rotomolding Masterbatch Compounding Pulverizer Plastic Milling Machine Advantages：

Elimination of external lab services. Sending plastic samples to an external grinding service adds lead time — typically 3–10 days — and cost to every R&D cycle. The PNLP-200 brings the grinding step in-house, allowing same-day sample production between formulation changes.

Minimal material waste between trials. The PNLP-200’s small grinding chamber and short conveying path minimise the amount of material trapped between trials. Rapid cleaning and changeover between resins reduces cross-contamination risk and material loss to a level appropriate for laboratory-scale work with expensive or limited sample quantities.

Ambient and cryogenic mode in one machine. A single PNLP-200 unit covers both ambient grinding (standard thermoplastics) and cryogenic grinding (rubber, TPU, EVA, heat-sensitive elastomers) — switching between modes does not require a separate machine. This is the primary reason laboratory users specify the PNLP-200 over a dedicated ambient-only or cryogenic-only unit.

Small footprint with casters. The PNLP-200 occupies 922 × 671 mm floor area and is mounted on casters for easy repositioning between lab benches or into storage. It does not require fixed installation or dedicated utilities beyond an electrical connection (and a nitrogen supply for cryogenic mode).

Versatile hopper design. The inlet hopper accepts pre-granulated material (≤3 mm) from standard lab containers. The outlet can be configured for direct collection into a sample bag or container. Minimal transfer steps between grinding and downstream testing reduces sample handling time and contamination risk.

Technical Features

1. Dual cooling mode: ambient and cryogenic — ambient mode uses standard water-and-air cooling for thermoplastics processed at room temperature; cryogenic mode uses liquid nitrogen injection for elastic or heat-sensitive materials. Mode selection does not require hardware modification — switchable via the control panel.
2. 203 mm disc, 3.75 kW motor — sized for laboratory throughput (1–25 kg/h); produces sample quantities sufficient for rotomolding mould trials, masterbatch dispersion tests, and compounding mechanical test specimens without generating excess inventory.
3. Input particle size ≤3 mm — pre-granulation of input material is required; the PNLP-200 is a fine-grinding machine, not a primary size reduction unit. Material must be granulated to ≤3 mm by a laboratory granulator or crusher before feeding.
4. Quick disc gap adjustment — feeler gauge and adjusting bolt mechanism allows disc gap to be changed between trials in minutes; no tools or disc removal required. Supports rapid testing of multiple particle size targets in a single lab session.
5. Versatile material range — handles LDPE, HDPE, LLDPE, PP, PVC, ABS, PS, EVA, TPU, rubber, and engineered resins in ambient or cryogenic mode as appropriate. Further materials available on request — contact WANROOETECH with your specific resin grade for confirmation.
6. CE certified, compact dimensions — 922 × 671 × 1,793 mm overall, castors standard; suitable for installation in laboratory environments without structural modification.

Frequently Asked Questions

What is the difference between the PNLP-200 lab pulverizer and the industrial PNMF series?

The PNMF series (disc diameters 300–800 mm, 30–800 kg/h, 15–110 kW motors) is designed for continuous production. The PNLP-200 (203 mm disc, 1–25 kg/h, 3.75 kW motor) is designed for laboratory-scale sample production — typically 0.5 to 5 kg batches for R&D trials. The PNLP-200 also supports cryogenic (liquid nitrogen) grinding mode, which is not standard on the PNMF industrial series. For facilities that validate a formulation on the PNLP-200 and then scale to production, WANROOETECH can confirm the equivalent PNMF model and disc gap settings for the same powder specification.

What materials can the PNLP-200 process in cryogenic mode?

Cryogenic mode is used for materials that deform rather than fracture at ambient temperature — elastic, rubbery, or highly heat-sensitive materials that cannot be ground to consistent powder at room temperature. Common cryogenic applications include: natural and synthetic rubber, TPU (thermoplastic polyurethane), EVA at high VA content, soft PVC with high plasticiser content, wax-based compounds, and some adhesive or hot-melt materials. Cryogenic grinding with liquid nitrogen embrittles the material before it enters the disc gap, producing clean fracture and consistent particle size. The same PNLP-200 unit handles both ambient and cryogenic modes — the operator connects the liquid nitrogen supply and activates cryogenic mode via the control panel.

How much liquid nitrogen is consumed in cryogenic mode?

Liquid nitrogen consumption depends on the material’s embrittlement temperature, the ambient temperature in the lab, and the throughput rate. For typical rubber or TPU samples, consumption is approximately 1.5–3 kg of liquid nitrogen per 1 kg of ground material. A standard 180-litre liquid nitrogen dewar is sufficient for a typical laboratory session (2–4 hours of intermittent cryogenic grinding at 1–5 kg/h throughput). WANROOETECH can provide more specific consumption estimates for your material grade and target throughput on request.

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