- An analysis of tearing sleeves found the likely cause was incorrect stretching during handling by the customer. - Tests showed sleeves stretched according to requirements did not tear, while sleeves stretched against requirements did tear. - An operating instruction was created for the customer with details on the proper compression and stretching techniques, including simultaneous rotation and compression/stretching movements.

1. 12 tearing sleeves - analyse
• Misapplication of handling: incorrect stretching

2. 12 Analyse - tearing sleeves
methods of analysis
• Ishikawa with interdisciplinary Team
•assessment of return shipment / defectet parts
•Own compression-tests at return defectet parts
excluded failure-cause:
•Spuriousness bonding of materials
– Monitoring by new control mode of machine, temperature-monitoring, etc
•failure of raw material from supplier
– comparison of material certificate showed no changes; adhesive application, glass
fabric, thread-count without difference
•Personal has adequate training

3. 12 Analyse - tearing sleeves
measured (possible) causes:
•No errors of this type for other customers, so we guess it is an individual
handling mistake by customer.
•Own tests (> 200) showed 100% clearly result: 200 parts tested:
•100 parts tested by Westaflex-requirement: compression and stretching;
100 parts OK
•100 parts tested against Westaflex-requirement: compression and
stretching; 100 parts NOK
•until now there is no described operator instruction for handling, it will
occur temporarly to broken sleeves

4. 12 operating-instruction for customer
Heat-Protection-Sleeve / compression and stretching
1. Handling-Process: compression 2. Handling-Process: stretching
1.1: rotation-movement of the hand
1.2: concurrent compression of sleeve /
concurrent push together the sleeve
2.2: concurrent streching the sleeve /
concurrent uncompressing the sleeve
2.1: rotation-movement of the hand
appearance after compression appearance after stretching / initial situation

5. 12 operating-instruction for customer
Heat-Protection-Sleeve / compressing and stretching
operating-instruction
handling: compression
operating-instruction
handling: stretching

6. 12 operating-instruction for customer
Heat-Protection-Sleeve / compressing and stretching
Misapplication of handling:
incorrect stretching Procedure informations:
• exact hand-movements is necessary
• hand-movement by compression-
process always in the same direction
• hand-movement by stretching-
process always in the same direction
• rotating movement of the hands
always simultaneous with
compression and strechting

7. 12 operating-instruction for customer
Heat-Protection-Sleeve / compressing and stretching
Misapplication of handling:
incorrect stretching Procedure informations:
• exact hand-movements is necessary
• hand-movement by compression-
process always in the same direction
• hand-movement by stretching-
process always in the same direction
• rotating movement of the hands
always simultaneous with
compression and strechting