Data from a Tire Manufacturing Company indicate that several problems contribute to defects in automobile tires. Table 1 below gives the list of different defects and their
frequency of occurrence.
Defect Type Frequency
Snaked Component 134
Wrinkled fabric 32
Exposed First Ply 121
Wrong I.D. 76
Wide Liner Splice 203
Open S/W Splice 22
Open Liner Splice 92
Off-Centered Bead 102
Wrong Component 62
Exposed Ply Splice 6
Misplaced Splice/Spotting 65
Humped W/W Splice 71
Flipback Turn-up 5
Foreign material 71
Open Ply Splice 4
Wrinkled Component 68
Wide Ply Splice 24
Open W/W Splice 34
Split Ply 2
Torn or Jagged S/W Edges 55
No Builder Number 50
Loose Chafer 44
Air between Plies 19
Humped S/W Splice 12
Blister Under S/W 43
Wrinkled Chafer 22
Miscellaneous 23
Analyze the data to find the root cause of the problem using Pareto Chart and Fish bone
diagram.
- a. Construct a Pareto chart for these data.
b. Which defects appear to deserve the most attention?
c. What lead to your decision in b? - a. Analyze the above problems using a Fish bone (Cause and Effect) diagram.
b. What are the root causes of problems in tires?