Frequently encountered problems

Issue Factors

Dimensional Control

1. Voids/holes in the mandrel

2. Soft rubber mandrels

3. Low tensile strength mandrels

Material Compatibility

Tube/Mandrel material compatibility leading to:

1. Mandrel bonding

2. Embrittlement

Mandrel Ejection

1. Mandrel material choice

2. Lubricant

3. Lubricant application

4. Ejection process/pressures

5. Preventing “snakeskin”

Cost Control

1. Number of mandrel turns

2. Ejection speed

3. Scrap/rejects

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