Which feature is associated with produced items in extrusion?

The feature associated with produced items in extrusion is continuous cross-section. This is a key characteristic of the extrusion process, where material, often in a softened or molten state, is pushed through a die to create long shapes with uniform cross-sectional profiles. This allows for the production of a wide variety of lengths and shapes with consistent dimensions, making extrusion particularly valuable for creating materials such as pipes, tubes, and structural components.

Extrusion enables manufacturers to produce items that maintain the same cross-sectional shape along their length, which is essential for applications requiring uniformity and consistency. The process can be used with various materials, including metals and plastics, to achieve the desired product characteristics efficiently.

In contrast, hollow sections refer to shapes that may be extruded, but are not a defining feature of the extrusion process itself. Folding mechanisms and grain patterns pertain more to different manufacturing processes or material characteristics rather than the fundamental properties of extruded items.