Scorched Backing
Tape Separation from Coated Abrasives
Inadequate Scuff Pattern
Torn Belt
Damaged Splice
Adequate Back Scuff
Tape Failure
Coated Abrasive Failure
Delamination of Fiber from Film
Voids in Glue Line
| CAUSES & CORRECTIVE ACTION |
Scorched Backing
- Excess RPM at scuff head
- Improper scuff head selection. Corrective Action: Reduce RPM of scuff head & select a scuffing process that will allow for better heat dissipation, i.e. non-woven belt, sand blast, silicone carbide belt, unitized belt.
Tape Separation from Coated Abrasives
Check for inadequate scuff & evaluate scuffing station, in particular, depth of scuff, condition of scuff media, & angle of scuff head.
Inadequate Scuff Pattern
- Check scuff head alignment & adjust to allow for a consistent pattern along edge of belt. Width of scuff head should be consistent to width of tape
- check infeed angle of belt & make sure infeed angle compliments coated abrasive bias angle.
Torn Belt
Equipment problem. Examine machine for irregular surface at platen or other contact areas.
Damaged Splice
- Check for faulty platen for nicks or gouges.
- Excessive joint thickness. (Measure joint thickness & back scuff depth
- Replace, redress or balance faulty contact wheel.
Adequate Back Scuff
2 Stage: 1st Abrasive Belt. 2nd Wire Wheel. or 1st Non-woven abrasive belt 2nd abrasive belt #80 Silca. or Wire Wheel and last but not least Sand Blast
Tape Failure
- Inadequate tensile strength.
- improper nesting/packaging of belts.
- grain impaction.
- Excessive machine tension on belt.
Coated Abrasive Failure
- Excessive backscuff causing severed reinforcement fibers in backing.
- Improper angle of scuff head.
- In feed angle of coated abrasive & scuff head should compliment one another.
Delamination of Fiber from Film
- Select different splicing tape
- Reduce machine RPM
- Select splicing tape with better heat resistance.
Voids in Glue Line
Look for sources of silicone or other contaminates in applicator or on press.
