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paper trimmer kinfes, cutter knife
paper trimmer kinfes, cutter knife
 
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    		• paper trimmer kinfes, cutter knife
    Paper Trimmer Knives - Cutter Knife Length of Bevel Chart
    Paper cutters must be viewed as complete cutting systems with many factors contributing to the quality of the cut. Many cutter operators too quickly blame the knife or the knife grinder for poor cutter performance when the fault is elsewhere.

    We have listed some common problems encountered and their probable cause to assist you in troubleshooting.
     
    Over cut
     
    Overcut is when the lower sheets in the lift are longer than the top sheets after trimming.
    trimmer knife, cutter knife
     
    Knife Clamp
     
    Cause Correction
    - Dull Knife - Change Knife
    - Wrong Bevel - For soft paper, decrease bevel angle by 2 degrees, i.e., from 24 degrees to 22 degrees
    - For hard paper, decrease bevel angle by 2 degrees, i.e., from 24 degrees to 26 degrees
    - Too much clamp pressure - as knife gets further into lift of paper the density increases causing deflection of knife.

    		 - Reduce clamp pressure
    - Back gauge not set square to vertical - Correct back gauge setting
     
    Undercut
     
    Undercut is when the lower sheets in the lift are shorter than the upper sheets after trimming
     
    trimmer knife, cutter knife
     
    Knife Clamp
     
    Cause Correction
    - Clamp pressure too low causing sheets to pull out at bottom
    		 - Increase clamp pressure
    - Wrong bevel on knife - Decrease bevel angle by 2 degrees, i.e., from 26 degrees to 24 degrees
    - Rough or uneven material being cut, such as gummed labels or embossed stock
    		 - Adjust clamp pressure
    - Back gauge not set square square - Correct back gauge setting to vertical
     
     
    Wavy Cut
     
    Diagonal shaded areas in direction of knife travel can be seen or felt
    trimmer knife, cutter knife
     
    Cause Correction
    - Knife bevel too sharp and deflects easily - Increase bevel angle by 2 degrees, i.e., from 22 degrees to 24 degrees.
    - Knife burned in grinding which caused soft spots that dull easily - Regrind knife correctly taking off at least 1.5 mm (1/16") width to remove damaged steel
     
    trimmer knife, cutter knife
     
    Vertical shaded areas across edge of lift can be seen or felt
     
    Cause Correction
    - Heavy print in certain areas causes large thickness differences across the sheets. This produces uneven clamp pressure in areas of defense print. Knife finds these areas harder to cut since they are packed tighter and deflects slightly.
    		 - Evenly distribute clamp pressure by applying felt or foam pad to face of clamp.
    - Knife burned in grinding which caused soft spots that dull easily. - Regrind knife correctly taking off at least 1.5 mm (1/16") width to remove damaged steel.
    - Knife angle too sharp causing deflection in high density areas. Inconsistent paper quality thickness. - Increase bevel angle by 2 degrees, i.e., 22 degrees to 24 degrees.
    - Change paper
     
    Arc Cut
     
    Sheets of paper are shorter at ends and longer in the center.
     
    Cause Correction
    - Lift is clamped only at center and not at ends of sheets.
    		 - Check clamp edge and apply felt or foam pad to distribute clamp pressure.
     
    Hollow Cut
     
    Sheets of paper are longer at ends and shorter in the center (not cut square).
     
    Cause Correction
    - Lift is clamped only at ends of paper and not in the middle.
    		 - Check clamp edge and apply felt or foam pad to distribute clamp pressure.
     
    Knife Rubbing
     
    Knife face rubs clamp causing scratches on knife face and clamp.
     
    Cause Correction
    - Knife dull
    		 - Resharpen knife more often and/or move up to next grade of knife.
    - Wrong bevel
    		 - Decrease bevel by 2 degrees, i.e., 24 degrees to 22 degrees.
    - Gibs worn on cutter
    		 - Repair machine
    - Combinations of above plus lift is too high
    		 - Reduce size of lifts being cut by 25% and look for improvement.
     
    Knife Nicks Badly
     
    Cause Correction
    - Knife at wrong bevel
    		 - Increase bevel by 2 degrees, i.e., 22 degrees to 24 degrees.
    - Knife burned in grinding producing small heat cracks which chip out
    		 - Regrind knife correctly taking off at least 1.5 mm (1/16") width to remove damaged steel
    - Knife set too deeply into cutting stick or stick groove has trash in it
    		 - Rotate to fresh stick surface and set depth of cut correctly:
    Tool Steel or High Speed Steel knives .102 - .152 mm (.004 - .006")
    Carbide knives
    .051 - .012 mm (.002 - .004")
    - Poor cutting sticks
    		 - Choose better quality stick. Use Tool Steel for Tool Steel or High Speed Steel and Carbide for Carbide knives.
    - Contaminated chip board
    		 - Try increasing bevel by 2 degrees, do not use Carbide or High-Speed steel knives.
     

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