Determine the correctness or otherwise of the following Assertion [a] ...
Assertion [a]: Emulsion thickener is used in pigment printing of textiles.
Reason [r]: Emulsion thickener has high solid content.
The correct answer is option D, which states that [a] is true but [r] is false. Let's examine this in detail:
Explanation:
What is an Emulsion Thickener?
An emulsion thickener is a substance that is used to increase the viscosity or thickness of an emulsion. Emulsions are mixtures of two immiscible liquids, such as oil and water, where one liquid is dispersed in the other in the form of small droplets. Emulsion thickeners are commonly used in various industries, including the textile industry.
Use of Emulsion Thickeners in Pigment Printing of Textiles
Pigment printing is a commonly used technique in the textile industry to apply color to fabrics. In this process, pigments are applied to the fabric surface using a thickened paste. The thickened paste helps to hold the pigments in place and prevent them from spreading or bleeding into the fabric.
The Correctness of Assertion [a]
The assertion [a] is true. Emulsion thickeners are indeed used in pigment printing of textiles. They are added to the pigment paste to increase its viscosity and provide the necessary consistency for printing. The thickened paste ensures that the pigments are evenly applied to the fabric without spreading or bleeding.
The Correctness of Reason [r]
The reason [r] is false. Emulsion thickeners do not necessarily have high solid content. The solid content of an emulsion thickener can vary depending on the specific product and application. Emulsion thickeners are available in different formulations with varying solid content to suit different printing requirements. Some emulsion thickeners may have high solid content, while others may have lower solid content. The solid content of an emulsion thickener is not directly related to its effectiveness or suitability for pigment printing.
Conclusion
In conclusion, the assertion [a] is true as emulsion thickeners are used in pigment printing of textiles. However, the reason [r] is false as emulsion thickeners do not necessarily have high solid content. Therefore, the correct answer is option D.