Fully Openable Lab Dispersion Banbury Mixer (KR-123)

Opening and Closing Rubber Dispersion Kneader

Categories 1. Rubber Testing Machine, 2. Plastic Testing Machine Tag Banbury Rubber Internal Mixer

Additional information

Model	RT-123
Capacity	1L/2L/3L/5L
Temperature	RT~250℃
Cooling method	Water cooling
Pouring method	Chamber opening and closing

What is an internal mixer?

The KR-123 open-close type kneader mixer machine is mainly used for mixing rubber and plastic. It is easy to operate, produces uniform dispersion, and is suitable for laboratory formula development and small production.

Product Details：

Product Overview

The KR-123 full-open laboratory banbury mixer is a specialized closed kneading device developed for polymer formula screening and small batch trial compounding. Different from conventional tilting discharge internal mixers, it adopts hydraulic fully split cavity architecture. After each mixing run completes, the entire mixing chamber can be fully unfolded, exposing rotors and all inner surfaces without blind spots for thorough cleaning. This design fundamentally eliminates cross-contamination between different formulas, making it ideal for color matching tests, high-cost raw material research, and frequent material switching workstations.

Inside the sealed mixing cavity, twin rotors generate continuous shear, compression and folding forces to evenly distribute fillers, pigments and additives into polymer substrates. Independent electric heating paired with circulating water cooling realizes precise temperature regulation, effectively suppressing rubber scorching caused by frictional heat buildup. It is widely deployed in university material labs, new material R&D institutes, silicone & rubber manufacturers, and third-party material testing centers.

Core Competitive Advantages

Hydraulic Full Split Cavity, Zero Dead-Angle Sanitation

Hydraulic power drives the whole mixing chamber to completely separate post-test. Operators gain full visual and physical access to rotors and cavity walls for complete residue removal; rotors can be detached separately for deep maintenance. This design drastically cuts cleaning time and avoids raw material cross-pollution, perfectly matching labs that switch formulas daily.

High Hardness Synchronous Twin Rotors for Superior Dispersion

Standard intermeshing two-wing synchronous rotors with a factory-set 1:1.3 speed ratio, customizable per customer drawings. Cast steel base undergoes quenching & tempering, finished with mirror hard chrome plating, reaching HRC55~60 surface hardness for outstanding wear and corrosion resistance. Powerful multi-directional shear crushes filler agglomerates to achieve uniform component distribution.

Multi-Mode PLC Touch Intelligent Control

Equipped with multi-language industrial color touch HMI, supporting manual, semi-automatic and fully automatic operation modes. Operators pre-set mixing duration, rotor RPM, target temperature and ram pressure; the system records full real-time process curves exportable for lab report filing. Dozens of custom mixing recipes can be stored for one-click recall during formula switching.

Dual Independent Heating & Circulating Water Cooling System

Embedded heating tubes inside the cavity work with jacket water circulation cooling for bidirectional temperature adjustment. The adjustable temperature window spans ambient up to 250℃, with a customized 300℃ high-temperature version optional. Balanced thermal control stabilizes mixing environments and prevents premature vulcanization of rubber compounds.
Transparent Anti-Dust Observation Window & Full Safety Interlock

A liftable transparent dust cover minimizes powder splashing during mixing while allowing real-time observation of material fusion status. Safety interlock cuts rotor power instantly once the cavity opens, plus an emergency stop button on the operation side to fully comply with international laboratory safety codes.

Compact Desktop Layout with Multiple Volume Options

Available cavity volumes: 1L, 2L, 3L, 5L to match different batch demands. The integrated cabinet occupies minimal bench space. Pneumatic pressurized top ram maintains stable compaction force throughout mixing to boost homogeneity of finished compounds.

KR-120 Internal mixer specifications:

Model	KR-123 Type
Mixing capacity	1L	2L	3L	5L
Production capacity【Adjusted according to the softness or hardness of the material】	0.5-1KG	0.8-2KG	1-3KG	2-5KG
Temperature range	RT~250℃【Can be customized 300 degrees】
Heating method	Electrical heating
Cooling method	Water cooling
Display accuracy	0.1℃
Controller	PLC programmable color touch screen, all process parameters can be set
Pouring method	Automatic chamber opening and closing, material freely falling
Reducer	Hardened gear reducer
Maximum pressure of pressure weight	0.3 (MPa)
Rotor speed ratio	1:1.3
Rotor speed	0-50 rpm/min, Frequency converter speed control
Feeding method	Manual
Rotor material	Carbide surface hard chrome mirror polishing
Rotor hardness	HRC55-HRC60
Mixing chamber	The refining chamber adopts rotor structure: rotor by the long prongs, short prongs, rotor body and rotor through the inner cavity of the circulating cooling waterway composed of the main drive system power output speed using infinitely variable frequency speed control.
Upper-pressure weight	Full pressure pneumatic, gas source pressure 0.5 ~ 0.8Mpa (customers provide their own gas source connection port)
Control system	Purchase advanced RIGHT17.5 mixing software system, can be multi-stage control refining program selection
Main motor【KW】	4.5		5.5
Volume	About L1500W900H1850mm		About L1600W980H1850mm
Power supply	3∮ 、AC380V 、22A three-phase, five-wire (PRC)
Weight	About 450kg	About 550kg	About 680kg	About 780kg

Standard Test Operating Steps

Pre-Inspection & Cleaning: Check water cooling circuits and power supply, fully wipe rotors and cavity to eliminate leftover material from previous batches.
Parameter Setup & Preheating: Input target temperature, mixing cycle and rotor speed via touchscreen, preheat the cavity to designated temperature value.
Raw Material Feeding: Weigh compound components precisely and load into the feeding hopper, then lower the transparent dust shield and activate the pneumatic top ram.
Automatic Mixing Cycle: Initiate the program and monitor material kneading status through the observation window in real time.
Hydraulic Discharge & Unloading: When the preset mixing time elapses, the machine halts automatically; release ram pressure and trigger the hydraulic split mechanism to fully open the mixing chamber for material collection.
Post-Run Sanitation: Thoroughly clean all internal metal surfaces, close the cavity and prepare for the next experimental batch.

Applicable Materials & Industrial Fields

Rubber & Elastomer Compounds

Natural rubber, NBR, EPDM, SBR, silicone rubber, recycled rubber, vibration damping and sealing formula materials.

Thermoplastic & Composite Materials

TPR, TPE, EVA, PVC, color masterbatch, high-filled modified plastics, low-smoke halogen-free cable insulation materials.

Special Functional Raw Materials

Ceramic powder, magnetic metal powder, high-viscosity adhesives, new polymer composite formulations.

Typical Application Scenarios:

Raw material formulation comparison and new product R&D trials
Small-batch pre-compounding before mass industrial production
Filler dispersion research for carbon black, silica and mineral powders
University materials science teaching and laboratory research projects
Third-party inspection institute standard sample preparation

Standard Machine Delivery Package

KR-123 main mixer unit
Complete set of twin synchronous alloy rotors
PLC multi-language touch control system
Hydraulic cavity opening drive assembly
Transparent anti-dust observation cover
Full set of operation manuals, electrical schematics and factory test certificate
Matching water circulation pipe fittings and power cable

Global Technical & Distribution Support

We supply full remote operation training, mixing process parameter consultation and long-term supply of wear spare parts for overseas partners. Customization services include special rotor geometry, extended high-temperature range and regional voltage adaptation. Exclusive regional distributor cooperation plans are available, offering priority production scheduling, custom machine paint colors and private OEM branding with complete marketing graphic materials provided.

The Best Internal Rubber Mixer Manufacturer–DGRIGHT

Dongguan Right Instrument Co., Ltd. is a professional manufacturer dedicated to the research and development, design, manufacture and sales of rubber and plastic machinery and equipment. The company has a number of experienced engineers, deep plowing rubber and plastic testing machinery for many years, the introduction of Taiwan technology, production equipment and attentive after-sales service to provide customers with energy-saving products.
The company’s products mainly include rubber and plastic pressurized kneading machines, Open-type Rubber (plastic) Kneader Mixer Machines, EVA/TPR/PVC/masterbatch high-speed granulation production lines, rubber extruders, automatic rubber filters, calenders, rubber cutting machines, Internal Mixer production line, extruding and pressing machine, extrusion production line, calendering production line, etc. The products mainly serve the tire industry, sealing industry, and other industries, and they are widely used in the production of rubber products. The products mainly serve in tire industry, sealing industry, hose tape industry, cable industry, medical cork industry, as well as EVA, TPR, PVC, masterbatches, low smoke halogen free resistance cable material production, etc. The processed products are widely used in various fields such as rubber electronic parts, shoe materials, automobile parts, conductive rubber, industrial oil seals, oil rings, packaging, sports equipment, medical equipment and various utensils.

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Fully Openable Lab Dispersion Banbury Mixer (KR-123)

Fully Openable Lab Dispersion Banbury Mixer (KR-123)

Additional information

What is an internal mixer?

Product Details：

Product Overview