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Vac Form material stretching

Vac Form material stretching

Vac Form material stretching

(OP)
We are currently trying to work out a formula to account for the measurement that takes place when PVC or a similar sheet material is vac formed in relationship to the depth, angle and relative area of the mould, is there any data written my manufacturers of machinery or material suppliers.
We wish then to apply this in reverse to the image that will then be distorted after moulding.

RE: Vac Form material stretching

Each thermoforming has unique stretch based on the shape of the male or female  die and what method is used to make the part. Do you use vacuum only? Do you billow the part? Do you snap back? How much are you stretching? You will have to try your process by marking your blank with lines arranged in intersecting squares and determine the distortion with your particular process.

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