8420.91.20.00 - For calendering or other rolling machines for machines for making paper pulp, paper or paperboard

This HTS classification covers cylinders specifically designed for use in calendering or other rolling machines. These machines are integral to the manufacturing processes of paper pulp, paper, and paperboard. The cylinders themselves are the key components that apply pressure and heat in these rolling operations, contributing to the desired finish, thickness, and surface characteristics of the paper products.

Distinguishing this category from its siblings, 8420.91.10.00 (cylinders for textile calendering or rolling machines) and 8420.91.90.00 (other cylinders), is crucial. This specific code is reserved solely for cylinders intended for paper and paperboard production, differentiating them from those used in textile manufacturing or other, less specific rolling applications. The intended end-use machine for the cylinder is the primary differentiating factor.

As a leaf node, this classification does not have further subcategories. Therefore, classification at this level relies on a precise understanding of the cylinder's design and its intended application within a paper or paperboard manufacturing calendering or rolling machine. Examples of cylinders that would fall under this code include those used for pressing, smoothing, or embossing paper and paperboard.