Compact system for clean dosing of liquid colors in plastic injection molding and in extrusion

colorDoS^® is a compact dosing system for liquid colors in plastic injection molding and in extrusion. The special design of the dosing nozzle prevents against color transfer and ensures a fast and clean color change. The smallest quantities of color are possible.

The feed system is mounted above the injection molding machine or extruder directly in the feed area of the conveying screw. It can be integrated into existing machines. The display control synchronizes the volumetric dosing pump and the operating steps of the system for precise metering of the liquid color. The control system further includes cleaning mode, color code management, remaining time display, alarm manager, and others.

The use of colorDoS together with liquid colors offers a real alternative to common masterbatches in many cases. It significantly reduces waste during color changes, protects the environment, ensures optimum machine capacity utilization rate, and saves material and time. Moving away from master batch and towards liquid color for the coloration of plastics is possible with colorDoS.

If you have any specific question about the dosing system, please contact our colorDoS expert Mr. Olaf Lang at olaf.lang@hnp-mikrosysteme.de.

We are happy to advise you on your colorDoS systems solution, support the on-site implementation and train your staff in the use of the dosing system for liquid colors.

At FAKUMA, in October 2023, an extension of the system for use in extrusion will be presented.
 

Advantages at a glance

• Compact dosing system
  easy installation directly above the feed area of the injection molding machine or extruder
• Gentle precision dosing
  high color fidelity with minimum color application by micro annular gear pump
• Clean handling
  dripless quick-release couplings, short fluid connections, dosing nozzle design for smallest color quantities without color transfer in the feeding area
• Fast color change
  low void volume allows fast rinsing of the pump module and thereby a fast color change
• Intuitively operated display control
  different operator levels, remaining time display until container change, alarm manager, color formulation management, cleaning mode, communication with injection molding machine, etc.

Functions of the colorDoS control

• Different operator levels
  operator, administrator, service
• Remaining time display
  with adjustable advance warning time until container change
• Color code management
  storage of up to 30 color code formulations
• Cleaning mode
  enables fast color change
• Alarm manager
  displays warnings (e.g. low filling level) or failures and can stop the injection molding machine to avoid rejects.

Components

• Micro annular gear pump
• Dosing nozzle
• Adapter unit
• Container holder with load cell
• Dripless quick-release couplings
• Display Control

optional:

• Signal light
• Tube kit

Typical liquids

• Liquid colors
• Additives

Applications

• Plastic injection molding
• Extrusion

 

Please contact the manufacturer of your choice with your inquiries about liquid colors. Based on our experience, we can recommend the following manufacturers.

This overview includes only manufacturers of liquid colors with which we have gained our own experience. It is not a full manufacturer overview.

Manufacturer for liquid colors

Product video colorDoS

Technical data

• Shot weight

  Injection molding: as of 2 g (depending on color addition and ink density)

• Material throughput

  Extrusion: 2… 600 kg/h (depending on color addition and ink density)

• Color addition

  Injection molding: as of 0.1 % (depending on shot weight and color density)
  Extrusion: as of 0.1 % (depending on material throughput and color density)

• Dosing volume

  Injection molding: 0.02 … 100 g color/shot (depending on dosing time and viscosity)

• Volume flow

  Extrusion: 0.2 … 100 ml/min (depending on viscosity)

• Precision CV

  < 1 % (Coefficient of variation CV)

• Clearance volume

  approx. 3 ml

• Color change duration

  as of 120 s

• Container change duration

  as of 10 s

• Viscosity range

  0.3 … 10,000 mPas

• Liquid temperature range

  -5 ... +60 °C (+23 ... +140 °F)

• Adaption

  Injection molding: 4 x M6, 60 x 60 mm (standard Arburg flange pattern)
  Extrusion: 4 x M8, 100 x 100 mm
  other dimensions can be realized with adapter plates

• Container dimensions

  1, 5, 10 and 20 liter container; Colorcube (max. weigth 30 kg)

• Fluid connection

  dripless quick-release coupling

• Interface

  Injection molding: start signal, error message to injection molding machine (potential-free contact)
  Extrusion: start signal, error message to extruder (potential-free contact), analog signal 0…10V
  signal light and acoustical signal (potential-free contact)

• Controller

  intuitively operated display control with 7" touch display

• Electrical connection

  230 V AC

• Dimensions (L x W x H)

  Injection molding: 256 x 487 x 362 mm [10.1 x 19.2 x 14.3 in]
  Extrusion: 307 x 487 x 362 mm [12.1 x 19.2 x 14.3 in]

• Weight

  Injection molding: approx. 18 kg
  Extrusion: approx. 27 kg
  (depending on the container holder)

• Notice
  Even if single parameters are within the indicated performance range of technical data, certain parameter combinations may not be achievable. Single parameters may exceed their indicated performance range under adequate circumstances. For detailed evaluation please contact HNP Mikrosysteme. Actual performance may vary. Specifications are subject to change without notice. 
  This document is subject to change without notice.

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Downloads

• Product information Dosing system for liquid colors DE EN 676.25 KB
• Operating manual colorDoS DE EN 2.06 MB

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