Compound Line
The mixing heart of the plant. Internal mixers and dispersion kneaders, sized by batch capacity and matched to the downstream mill, batch-off and weighing equipment that surrounds them.
A compound line is not one machine. Raw polymer, fillers, oils and chemicals are weighed, dropped into a mixer, worked until the batch is homogeneous, then discharged to an open mill and cooled into sheet or strip for the next stage.
PAXTON supplies the mixing stage in two forms — internal mixer for high-throughput batch mixing, and dispersion kneader where dispersion quality and colour changeover matter more than raw volume — and plans the equipment around them so the line runs as one system.
| Mixing stage | Internal mixer or dispersion kneader |
| Capacity range | 75 – 180 L |
| Temperature control | Automatic |
| Upstream | Auto feeding & weighing system |
| Downstream | Open mixing mill, batch-off cooling |
| Materials | Rubber, synthetic rubber, EVA, PVC and compounding chemicals |
Internal Mixer
A Banbury-type internal mixer: two rotors turning in a sealed, water-jacketed chamber, with a hydraulic ram pressing the batch down onto them. Shear does the work — the compound is masticated and the fillers dispersed in a matter of minutes, with the batch never exposed to the room.
Mixers are usually installed on a raised deck and discharge straight down onto an open mixing mill, which sheets the batch out and feeds the batch-off cooling line.
| Model | Chamber Volume | Main Motor | Rotor Speed |
|---|---|---|---|
| PX-BM-75 | 75 L | 200 HP | 32 / 36 rpm |
| PX-BM-100 | 100 L | 400 HP | 10 – 40 rpm |
| PX-BM-180 | 168 L | 1,066 HP | 10 – 60 rpm |
Model number refers to nominal size; chamber volume is the actual working volume. Rotor speed can be specified as single-speed, two-speed or variable, with synchronous or non-synchronous rotor geometry to suit the compound. Larger chambers and other capacities can be quoted on request.
Construction
- Mixing chamber — twin water jackets on the chamber halves for heating or cooling
- Rotors — hollow, water-cooled, with hard-facing on the blade tips to resist wear
- Seals — hydraulically self-adjusting, fed by a multi-point high-pressure lubricator
- Ram cylinder — cast or fabricated, with internal guides to hold the long stroke true
- Reduction gear — fully enclosed, single input / twin output heavy-duty unit
Control
- PLC + HMI — manual, semi-automatic and fully automatic modes
- Recipe control — process conditions logged, live trend charts, remote monitoring
- Ram options — pneumatic, or hydraulic servo for closed-loop ram pressure
- Cooling — low-temperature mixing to avoid scorch on heat-sensitive compounds
Dispersion Kneader
Also called a pressurised kneader. The rotors are tangential and the chamber tilts to discharge, which makes it quicker to empty, quicker to clean, and much easier to change colour or compound between batches.
Where an internal mixer is built for throughput, a kneader is built for dispersion quality and flexibility — the usual choice for smaller batches, specialised compounds, colour work, and any shop that runs many recipes rather than one.
| Model | Mixing Capacity | Main Motor | Tilt Motor |
|---|---|---|---|
| PX-KN-75 | 75 L | 125 – 150 HP | 5 HP |
| PX-KN-110 | 110 L | 175 – 200 HP | 7.5 HP |
| PX-KN-150 | 150 L | 200 – 300 HP | 10 HP |
Motor power is given as a range — the drive is specified to the compound and cycle time. Automatic temperature control across the range. Smaller and larger capacities available on request.
Key Features
- Fast cycle — a batch mixes in minutes, sealed against material loss
- Tilting discharge — the chamber empties completely; no scraping out
- Automatic cooling — at the temperature limit the steam closes and the water circuit takes over
- Compact — the practical choice where floor space is the constraint
- Front or rear feed — specified to suit the feeding arrangement
Applications
EVA and TPR · rubber shoe soles and beach sandals · rubber rollers · tires and inner tubes · sponge and foam · O-rings, oil seals and gaskets · hose and belting · sports equipment and balls · anti-vibration rubber · PVC flooring · adhesive tape · rubber magnets · masterbatch and pigment · ink · electrical and automotive rubber parts.
Internal mixer or kneader?
| Internal Mixer | Dispersion Kneader | |
|---|---|---|
| Best for | High throughput, few recipes | Dispersion quality, many recipes |
| Discharge | Drop door, to mill below | Tilting chamber |
| Changeover | Slower | Fast; easy colour change |
| Footprint | Larger; usually needs a deck | Compact; single floor |
| Capacity here | 75 – 168 L | 75 – 150 L |
Both are batch machines and both discharge to an open mixing mill. If you are unsure which suits your compound and volume, send us the recipe and the target output — that is the conversation we would rather have than a specification sheet.
Planning a new line or replacing equipment?
Send us your target product, capacity, process and available plant conditions. We will review the equipment scope with you.