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BASIC PRINCIPALS
The SMS mixing elements consist of a structure of crossing intermeshing bars (welded and notched) which are installed into the flow channel and do mix the melt flow: is continuously split, stretched, recombined and conveyed, thus, according to a geometric principle, continuous mixing with ideal plug-flow behaviour and minimum residence time are achieved.

Each SMS is welded into its sleeve and then each sleeve welded to the next which is rotated by 90°; in such way max mechanical strength is achieved creating also flow subdivision first two-dimensionally and then three-dimensionally. The intersecting bars of the mixing elements subdivide the melt stream thousands of times (about 32000 times).


APPLICATION RANGE
With the melt blender nearby all thermoplastics, with exception of PVC, can be processed without difficulties (LLDPE, LDPE, HDPE, PP, FOAM PP, CrPS, HIPS, ABS, APET, PETG, PMMA, PC, PA, PU, SBS):
Foils/sheets
Pipes
Profiles
Foam extrusion
Blown films
Blow moulding
Fibres
Coating
Mono-filaments extrusion
Compounding

INSTALLATION
The SMB-S Melt blenders should be located just behind the extruder or usually after the gear pump, and installed inside standard housings and/or necks with flanges; they require practically no maintenance because they have no moving parts. The complete static mixer, which consists of several SMS mixing elements, usually four elements, reduces excessive temperature variations, colour streaks, and viscosity fluctuation of the melt. SMB-S melt blender accomplishes these requirements at low pressure drop and in remarkably short length.



ADVANTAGES


ADVANTAGES

  • Excellent temperature uniformity (uniform melt flow);
  • High mixing efficiency even with variable processing conditions;
  • Constant extrusion condition in the dies and/or heads, including regular viscosity even processing high percentage of regrinds;
  • High adaptability to existing flanged barrels;
  • Higher mechanical strength, as a result of internal notches on each mixing element;
  • No dead zones (new design);
  • No moving parts, no maintenance is necessary.

 

 

BENEFITS

  • Reduction of the colorant consumption and thus the coloration costs up to 25%;
  • Streakless products independent of the coloration method;
  • Improved mechanical and surface quality of the final product;
  • The narrow residence distribution provides an excellent self-cleaning behaviour (shorter time for changing colour);
  • More narrow tolerances of the extrudates;
  • Fast payback;
  • Low pressure drop;

 

TEMPERATURE PROFILE DOWNSTREAM THE SCREW AND DOWNSTREAM THE MELT BLENDER:

In this example curve a 18 °C temperature difference exists between the molten plastic at the centre of the melt and
the plastic near the barrel wall. SMB Melt blender reduces this temperature difference to less than +/- 0.5 °C.  

DIMENSIONS OF STANDARD SMB-S  
(MELT BLENDERS WITH 4 ELEMENTS)



GENERAL DESIGN PROPERTIES OF FLANGED BARREL = 700 BAR @ 200 °C . FIRST FOUR MODELS IN THE ABOVE TABLE
CONTAIN CASTED MIXING ELEMENTS.

 

DIMENSIONS OF STANDARD SMB-R  
(MELT BLENDERS WITH 4 ELEMENTS – RING VERSION)

CONCENTRICITY BETWEEN INTERNAL AND EXTERNAL DIAMETER: -0 / +1
GENERAL DESIGN PROPERTIES OF FLANGED BARREL: 700 BAR & 200 °C

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