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Domestic fans please help!

  1. Nov 28, 2003 #1
    Domestic fans....please help!

    Hey everyone.
    WE are currently undertaking an engineering project and need some simple, yet seemingly unobtainable, answers to some questions. The questions are regarding domestic electrical fans. If you have the answers to these questions, or any useful hints about wind power, please reply to this post or email me.
    1. WHAT IS THE OPTIMUM BLADE ANGLE, SHAPE?
    2. HOW EFFICIENT ARE THEY
    3. WHAT KIND OF GENERATOR WOULD BE MOST SUITABLE AND MOST EFFICIENT
    4. HOW DO THEY ACTUALLY WORK?

    If you could answer these questions or help us in any way please please get in touch as we have hit a bit of a wall and need a kick in the right direction.
    many thanks, anne and ol. :smile:
     
  2. jcsd
  3. Nov 28, 2003 #2
    blade angle

    The optimum blade angle is 30 - 35 degrees tangent to the blade contact point
    This window facilitates ideal ink distribution in conjunction with slow, consistent doctor blade wear.

    BLADE SELECTION

    Choosing the correct steel is of the utmost importance! XcaliburTM highly refined doctoring steels are considerably more advanced than those produced by conventional methods. A proprietary metallurgical method of steel purification produces noteworthy improvements in physical properties, in particular fatigue properties, impact strength and ductility . The micro granular structure of XcaliburTM steel degrades in a very even and consistent fashion along the entire width of your engraved cylinder; it wears like sand not gravel! The end result is the most consistent ink film thickness being delivered to your substrate with minimum trauma caused to the surface of your engraved cylinder. Also, the micro granular particles are easily transported and collected in your ink stream. A filter/magnet system on your return line to the fountain will remove contaminant’s and metal particles from your ink stream. Refined magnetic collection systems are currently being introduced to improve the collection process. Regardless of your method, filter/collection systems should be monitored and cleaned on a regular basis to avoid plugging.

    Stainless steel blades are often used in corrosive applications but due to their lower tensile strength and hardness tend to fracture at the tip introducing large metal fragments into your ink stream. The area of fracture leaves undesirable voids in the doctoring tip. As previously mentioned plastic and synthetic blade materials "utilized for primary doctoring" allow particles to imbed in the doctoring tip which leads to printing defects.

    Selecting the ideal doctor blade for your specific application is greatly influenced by your anilox roll specifications, enclosed chamber configuration, machine width and speed, type of ink and its viscosity. Consult your XcaliburTM representative for a detailed analysis.

    ANILOX ROLL WEAR

    The reason for abrasive wear of the anilox (hardness 1100-1200 Vickers related to doctor blade hardness of 565-580 Vickers) can be micro fractures in the ceramic layer resulting in small ceramic particles coming into the blade contact zone and damaging the anilox cell structure . This can occur in new rollers that are not properly finished or when ceramic chips away from your anilox roll at the outer edges. It is essential that the surface of your roller be free of ceramic burrs. Consult your anilox roll supplier for complete details.
     
  4. Nov 28, 2003 #3
    thankyou

    Thanks for replying to our problem but we were referring to fans that cool the room not inkjet fans. if u have any information concerning these types of fans please send us info.
    thanks again
    anne and ol:smile:
     
  5. Nov 28, 2003 #4
    himm

    ohhh
    i have only this information in my mind.
    let me think for the room fans.
     
  6. Nov 28, 2003 #5
    So what does any of this have to do with philosophy? You might want to try contacting the forum moderator and ask that this be moved to the Engineering or Technology forum.

    Thanks.
     
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