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A paper sizing agent is a chemical that improves paper’s quality and water resistance. It can be added to the paper pulp during manufacturing or applied to the paper’s surface after it’s formed. Types of sizing agentsa. Alkyl ketene dimer (AKD): A chemical compound that’s often used to improve water resistance. AKD can be added to paper pulp as a solid wax or white liquid emulsion. b. Gum rosin: A product of pine trees that improves paper’s strength and smoothness. c. Cationic surface sizing agent: A styrene-acrylic emulsion that improves paper’s surface properties. It can also be used as a film former in coating applications. d.Modified starches: A common type of sizing agent. e. Polyurethane: A common type of sizing agent.

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