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Title: 2d  
Author: World Heritage Encyclopedia
Language: English
Subject: Dimension, Microextrusion
Publisher: World Heritage Encyclopedia


2 1/2D is a conventional way of describing a process for obtaining an object where the third dimension is somehow dependent from the transversal cross-section of the same.

2 1/2D is used for differentiating a 3D process, like for example plastics extrusion, extrusion, drawing or dipping from other processes, like for example microextrusion, overmoulding, etc.

The product of the 2 1/2D process can, in fact, be described by mean of a transversal cross-section and a longitudinal cross-section as any other, but in which the transversal cross-section varies, generating a variable longitudinal cross-section generally more simple than the transversal cross-section.

In other words, the third dimension, so the longitudinal cross-section can be represented as the projection of the transversal cross-section in the infinity of the horizon.

An example of 2 1/2D processing, can be 2 1/2D microextrusion, where, thanks to an optimal control of the process, the obtained extrudate, which is generally, but not always a tube, can have:

  • Tapered profile, which means that diameters or characteristic dimensions, varies independently from each other.
  • Bump profile, which means that dimensions will vary in a dependent way, so the dimensions will be proportional.
  • TIE (Totally Intermittent Extrusion) profile, which means that at least one of the materials composing the cross-section switch to another allowing a variation of hardness, radio-opacity or other specific characteristics.
  • ILE (Intermittent Layer Extrusion) profile, which means that the materials composing the cross-section can vary the proportion between themselves, in case of a tube for example, the thickness of one layer can change independently from others.



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