The direction of the winding is controlled by a computer. The tow can be laid down in any direction needed from axial to 90deg. Interesting info on this:
https://www.compositesworld.com/articles/a-filament-winder-buyeramp39s-guide
If you read your referenced page, it says some machines can do NEAR axial, up to 6 degrees. Predators illustration is showing 0 degrees.
From Rockwestcomposits.com...
1. ROLL WRAPPING
Roll wrapping is typically done with a prepreg product to ensure consistency. A prepreg is a composite product consisting of fabric or fiber already impregnated with the epoxy resin necessary to hold everything together.
The prepreg material is cut into layers of different fiber orientation. Those layers are then rolled onto a cylindrical rod known as a mandrel. The mandrel and prepreg are then wrapped in a plastic film to contain the epoxy resin and compress the layers during curing. Once curing is complete, the mandrel is removed from the center of the finished tubed.
Roll wrapping results in maximum consistency across both carbon fiber and fiberglass tubing. The process also affords more customization in terms of both fiber/mandrel configuration and production quantities. Roll wrapping is the preferred process for producing small runs.
2. FILAMENT WINDING
The filament winding process begins with a composite tow of either carbon fiber, fiberglass, or a carbon fiber-fiberglass hybrid. The tow is loaded onto multiple spools at the back of the winding machine. At the front is a long mandrel that acts as the form for the tubing.
To create the tubing, a carriage travels up and down the length of the machine while the mandrel spins. The tows are applied to the mandrel in a spiral pattern like the stripe on a candy cane. The angle of the spiral can be adjusted as well as how many spirals it takes to make a layer. Once completely formed, the tube is cured before being separated from the mandrel.
Filament winding is more automated than roll wrapping, and therefore a more cost-effective way to produce large volumes of composite tubing in a short amount of time. Customization is often easier with roll wrapping since the fiber and resin can be mixed and matched at the winding machine instead of during the prepregging process.
Which is better: filament wound tube or mandrel wrapped tube?
Filament wound tubes use wet laminate. This means they can suffer from variations in the resin:fibre content. They can also have a lower HDT (maximum temperature before distortion) as filament wound tubes are not post-cured at a high temperature (like mandrel wrapped tubes). Filament wound tubes do not usually contain as much 0º (degree) fibre as mandrel wrapped tubes so they will not be as stiff.
Mandrel wrapped tubes have a much wider range of laminate possibilities, including tapered laminates. This means C-Tech's carbon tubes can be better suited to a particular application than filament wound tubes.
A traditional ‘cloth weave’ finish is often required for carbon tube. The filament winding process doesn't allow an outer layer of cloth fibre to be added to the laminate.
