User guide

Profile/Bubble/Taper Mode -
Velocity Page Description
Ratio Calculator (continued)
The extruder emits a constant volume of material, so the ratio of speeds to make a
product will be the inverse ratio of the wall area. The Ratio Calculator assists in the
calculating the area ratio of round solid or single lumen products. Enter the OD (out-
side diameter) or the ID for each section.
The Area Ratio (found on the right side of the screen) is used with the Tip Speed to
determine the Belly Speed. In the example above, the diameters of the product were
entered in the OD and ID windows and an area ratio of approximately 2.6:1 was cal-
culated. If the Tip Speed is 30 FPM, then the Belly Speed needs to be 11.49 FPM to
create the desired bubble.
The new calculated value does not factor the stretch of the material that occurs when
air is used to create the OD and ID. Only use the calculated result as a basis for
achieving the speed required to make a product.
To enter the OD and ID of both the Large Section (Body) or the Small Section (Tip)
of the material that is being produced:
1 Press the OD or ID window of either the Large or Small product section. A
pop-up keyboard will appear.
2 Key in the new OD or ID.
3 Press the “Enter” button. The pop-up keyboard will be removed.
4-116 l Operation
(continued)