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When processing multi-component materials, homogenous mixing of the components becomes extremely important.
Wide differences in media viscosity, short pot life, components which are difficult to mix etc., require different mixing systems.
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Materials remain separate until injected into static mixer.
The patented Graco PD44 Valve features balanced inlet/outlet spool assemblies that do not displace
material while shifting from the reload to the dispense position. This allows pressure feeding of the
"A" and "B" components up to 1200 psi during reloading while isolating the materials from the mixer
inlet. Upon shifting to the dispense position, an accurate volume of "A" and "B" components
is injected into the disposable mixer inlet by rod displacement metering technology
Reload
Spools shift to the right
- Material feed inlets are opened
- Materials are transferred into the metering chambers
by a pressurized feed system
- Outlet ports are blocked
- Metering rods are retracted to a precise position determining
the volume of each material
Shift
The balanced spool assemblies shift to the dispense position
- Material path to the mixer inlet is opened
- Material feed inlet ports are blocked
- Metering rods remain in the retracted position
Dispense
Metering rods drive down
- A and B materials are simultaneously dispensed from the metering
chamber into the disposable mixer
- A and B materials are dispensed at the predetermined volume ratio.
Upon completion of the dispense stroke, the metering rod
and spool assemblies shift back to the reload position
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Cold Dipping method (Piece in Vertical Axis, in Static Position and Not Preheated) gives the piece a medium-low absorption level in terms of quantity of Resin, mainly on the Copper winding, while on the Core Lamination (Intra-Lamination effect) it seems not to have big advantages. Cold Dipping Technology is Worldwide largely used and is suggested to Impregnate all those electrical products where working stresses are very low or those components for which other methods can not be used (for instance: Transformers, Coils, Bobbins). The resin's solid content after dripping is very low.
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Hot Dipping method (Piece in Vertical Axis, in Static Position and Preheated), likewise for the Hot Roll Dip Method, gives the piece a medium absorption level in terms of quantity of Resin, not only on the Copper winding but also on the Core Lamination.
Hot Dipping Technology combines two main aspects to reach the Best Results:
Dipping Phase in Tank at controlled immersion Speed and Hot pieces, so the penetration of Resin will be complete on all Piece's Sections.
Heating Technology in High-Performance Air Ovens, this causes a faster Gelling phase of the resin than traditional Ovens with the consequent achieving of a more restrained Dropping.
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This method (Piece in Horizontal Axis and in rotation state) gives to the electrical components an high absorption of the resin : on the Winding in Copper and the Core Lamination that is the heart of the piece . The Technical advantages coming from this method consist mainly in:
- Regular and Uniform Resin distribution on the whole winding and this guarantees a better piece balancing , first of all for rotating components (Armatures , Rotors , Polar Wheels , so on).
- Resin is excellently retained on the windings , therefore a greater quantity of Resin will remain on surfaces, by giving higher mechanical and thermal properties .
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Impregnation Plants
Trickling method
This method (Piece in Horizontal Axis and in rotation state) gives to the components (Stator or Rotor) an Excellent and Regular Resin Saturation in the Winding Slots, besides the resin applied on the two winding's heads. Technical Advantages using this Impregnation method consist mainly in:
By using Correct and Constant Process Parameters, 100% of right quantity of Resin will be applied on the Piece, so that Unnecessary waste of this expensive element will be avoided.
Application of the Resin in the right specific Zones, so that resin deposits in Technological Areas only and any cleaning after-work for removal operations will be necessary.
A Best and Uniform distribution of the Resin in the different Sections of the winding is guaranteed by the Rotation of the Piece, so ensuring constant and homogeneous results in the different Pieces' Sections.
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Micro Light Build: Realize the vast and boundless potential in UV chemistry
Araldite® Digitalis is a new polymeric additive fabrication system capable of manufacturing large numbers of parts simultaneously at high speed with previously unattainable accuracy. Based on entirely new microelectromechanical systems (MEMS), Araldite® Digitalis offers significant
benefits over any other laser-based apparatus currently on the market, combined with ease of use and maintenance.
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SGL Group operates the most up-to-date facilities for the production of pre-impregnated materials. Our unidirectional SIGRAFIL® prepregs are based on carbon fibers, and our SIGRATEX® fabric prepregs are made from carbon fiber fabrics.
By acquiring epo gmbh and the prepregs brand PREDO®, we have expanded our product portfolio as well as our core competency in the field of pre-impregnated materials.
* SIGRATEX® fabric prepregs
* SIGRAFIL® unidirectional prepregs
* PREDO® prepregs (For further information on the product, please refer to related subjects)
The fiber type is the main factor determining the strength, Young's modulus and other important properties of fiber composite products. The reinforcement fibers are precisely aligned and economically combined with the resin matrix.
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