In the roller printing the samples are marked:

Question

Accepted Answer

The correct option is 3:

Roller printing, also known as machine printing or cylinder printing, is a high-speed, high-volume method used in the textile industry for the continuous production of printed fabric. In this process, the samples or designs are, in fact, permanently marked **On the roller** itself. This key component is a massive, highly polished copper or metal cylinder, and the entire design pattern is skillfully engraved onto its surface. A separate roller must be engraved for every single color required in the design, and each roller is positioned to print its specific part of the pattern in perfect alignment. During operation, each engraved roller rotates, picking up its designated color paste from a trough. A razor-sharp 'doctor blade' then wipes all the excess color from the unengraved surface, leaving the paste only in the microscopic indentations that form the design. The fabric is then passed between the engraved roller and a central pressure cylinder, and the color is pressed onto the fabric, permanently marking the material. Therefore, the engraved roller is the essential master template that carries and transfers the design.

The incorrect option is 1:
The incorrect option is 1: On wooden block. This option describes *Block Printing*, which is a traditional, slow, and manual method, not roller printing. In block printing, the design is carved in relief onto a flat wooden block, and the raised portion is used to stamp the color onto the fabric. Block printing cannot achieve the speed, fine detail, or continuous pattern repetition of industrial roller printing, which was developed precisely to mechanize and replace the slower wooden block method.

The incorrect option is 2:
The incorrect option is 2: On the screen. This option refers to *Screen Printing* (either flatbed or rotary). In screen printing, the pattern is created on a mesh screen where some areas are blocked and others are left open. The color paste is pushed *through* the open parts of the screen mesh onto the fabric. While rotary screen printing uses a cylindrical screen, the design is on the mesh and not engraved directly into a solid metal roller, which is the defining characteristic of roller printing.

The incorrect option is 4:
The incorrect option is 4: On the stencil. Stenciling is a basic, manual method of printing where a design is cut out of a piece of material, and color is applied through the resulting opening. Stencils are generally used for applying simple, isolated motifs or logos. They are unsuitable for the continuous, complex, and high-pressure demands of a high-speed industrial process like roller printing, which requires the durability and precision of an engraved metal cylinder.