Depth of Draw
The depth draw is the ratio of average sheet thickness divided by average part thickness. The depth a thermoplastic material is drawn is important to determining the best thermoforming technique because it is a prime factor controlling the final average thickness of the formed part. For moderately deep draws or depth to width ratios of less than 2:1, male drape forming gives a more uniform wall thickness than straight vacuum female forming. For very deep draws or depth to width ratios exceeding 2:1, billow pre-draw and plug-assisted female forming is suggested to obtain the most uniform material distribution.
