Flat stitched bellows
PEI stitched flat bellows: strong and durable
The flat sewn bellows produced by PEI have the great advantage of being particularly robust and of having a closed parcel that is very contained in relation to the bellows run. The construction of this model takes place through a double stitching on the bellows’ wings.
The cleaning of the sewn bellows from shavings and sludge is guaranteed: there are no folds of fabric that prevent it from falling onto the evacuator. The sewn gussets have a lower closed parcel than traditional heat-sealed gussets as there are no fabric folds in the corner. The range of buildable structures is practically endless. If the application on the machine requires structural rigidity, metal reinforcement and shaped intermediates can be inserted for a secure support on the rails.
B = Bellows width
a = Bellows height
d = Bellows return
x = Fold height
AP= Fold opening
For this type of bellows, consult our technical department.
Formulae for calculating the closed parcel
Formula for the calculation of the CLOSED PARCEL of the sewn flat bellows
- Closed Pack = NP x 2,5 + flange thickness
Formula for calculating the N ° of STEPS
- NP = Number of steps = P.A. / AP + 2
Formula for calculating the OPENING of a step
- AP = 1 step opening = (x-8). 1.41
For this type of bellows, consult our technical department
- P.A. = Open parcel
- P.C. = Closed parcel