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Nip Point Safety
According to ASSE the definition of a NIP POINT is:
The point of intersection or contact of two opposed circular surfaces, or a plane surface and a circular surface, in which a worker’s body or clothing
may be caught
According to FPA a nip is:
1. The point at which two adjacent rotating rolls meet or touch. Material is “nipped” between the rolls, and drawn further into them.
2. To bring two surfaces together, usually between two rotating rolls.
According to Webster, a NIP is;
1. To catch or squeeze between two surfaces, points or edges; pinch or bite.
2. To severe by pinching or clipping.
3. A small drink of liquor.
The above do not play well together
Guarding
Guarding has one purpose. . .that is to protect the operator from contact with the point of danger
Overall Choice of Guarding
Depends on:1. Space limitation2. Production methods3. Size of the work piece4. Frequency of use5. Cost
Guards should be:
1. Integral parts of the machine2. Well constructed and foolproof3. Fail Safe4. Tamper proof5. Able to accommodate work piece feeding and ejection6. Protective7. Easy to inspect and maintain
Guards should NOT be:
1. Hazardous2. Not interfere with operations3. Create discomfort4. Require delicate adjustments
Machine Guarding Techniques
1. Enclosure Guardsa. Barrier Guardsb. Point of Operation Guardsc. Power Transmission Guards
2. Fixed vs. Operator vs. Maintenance3. Automatic4. Remote Control Systems
Nip point hazards on a typicalFlexographic printing press
1. Press Section - Doctor Blades, Fountain, Anilox, Plate and Impression cylinders; Press Infeed Nip Roll; Press Main Drive Shaft; Cross Drive Shafts (Quadrant Gear)
2. Unwind - Lay-on roll and new parent roll (inboard spindle); Turret indexing and lower spacer frames or floor
3. Rewind - Rider Roll or Auxiliary Rider Roll and newly winding roll (if running on outboard station); Turret indexing and lower frame spacers or floor.
3. Overhead - Cooling Roll and Nip Roll.
4. Auxiliary Equipment - Outboard printing, coating and laminating units have the same type of nip points.
Common Problems
1. Jog vs. Run2. Normal Stop vs. E-stop vs. Sunday Drives3. “Need items” vs. “Want items”•Do I have to do that task, or do I just want to do that task?•Do I have to reach in there, or do I just want to reach in there?•Do I have to see in there, or do I just want to see in there?
U.S. Standards
1. OSHA - 1910 Subpart O - Machine Guarding2. ANSI B65.1 - Printing Press Systems3. ANSI B155.1 - Packaging and Packaging-Related Converting Machinery4. ANSI B15.1 - Power Transmission Apparatus
U.S. Standards
5. ANSI B11-19 - Performance Criteria for Safeguarding6. ANSI B11-TR3 - Risk Assessment and Risk Reduction
International Standards
1. EU - Machinery Safety Directive2. EN 1010-1 Safety Requirements for Printing and Paper Converting Machines - Common Requirements3. EN 1010-2 Printing and Varnishing Machines including Pre-Press Machinery
International Standards4. EN 294 - Safety distances to prevent danger zones to be reached by the upper limbs5. EN 349 - Safety Distances -Minimum gaps to avoid crushing of parts of the human body6. EN 811 - Safety distances to prevent danger zones to be reached by lower limbs.
Murphy’s Law
• You can’t make anything foolproof, because fools are to ingenious.
• You just can’t fix STUPID.• Some days it seems all I’m doing is
rearranging deck chairs on the Titanic.
Questions ?
Mike DeRosierCorporate Product Safety Manager
Paper Converting Machine [email protected]
920-491-6239
