What is Surface Sizing?
Surface sizing is the process used to improve the surface properties of a paper in the paper manufacturing industry. It is the process of reducing the paper porosity and improving the surface intensity and air permeability by forming a thin layer of surface additive chemicals on the surface of the paper. Most of the paper and board manufacturers use a variety of surface additives to improve the visual and functional applications of their paper products.
Chemicals in addition to starch used to improve the strength and performance of paper products and reserve the paper quality are known as surface additive chemicals. The Presence of these sizing press additives into the paper is responsible to reduce dusting tendency and stiffness and to surge the overall strength of the paper. Buy a supreme quality of surface additives from a top-rated surface additives chemicals supplier.
How to Improve the Functionality of Surface Additives?
Surface additive chemicals contain both hydrophilic and hydrophobic ends. Its hydrophilic tail combines with the fiber and forms a thin film on the paper surface and hydrophobic tail faces outwards. These chemicals are not added to the wet end of the pulp. These are pH-sensitive, therefore a high pH needs to keep the additive dissolved. The proper quantity of internal sizing agents keeps the thin starch film closer to the paper surface to achieve effective results.
Types of Surface Additives Chemicals
Additionally, with starch, the most ordinarily used surface size additives are styrene-maleic anhydride (SMA) copolymers, styrene acrylates (SA), alkylated urethanes, and several other latex products that embody a number of equivalent chemical operations.
Styrene Maleic Anhydride Copolymers
SMA copolymers are pre hydrolized, a synthetic polymer made up of the monomers of maleic anhydride and styrene. These surface additive chemicals have lower molecular weight and widely used in papermaking to improve the surface quality of the paper and boards under neutral and alkaline conditions. The use of SMA offers a faster cure, toner adhesion and improved film foaming properties and cleaner running mechanics.
Styrene acrylate polymer or styrene-acrylate emulsion is formed from styrene and acrylate chemical compounds. it’s smart resistance to water, alkali, and laundry, and is widely employed in adhesives and coatings. Introduction of exhausting chemical compound styrene-acrylic ester emulsion system, known as styrene – acrylate emulsion, because of its high-value performance, the adhesive, paper size agent and coating etc wide used.
Benefits of Surface Additive Chemicals in Paper Manufacturing Industry
Surface additive chemicals are the main ingredients of the papermaking process. The right quantity of the chemicals in fabric solution improve product quality in several ways.
- Improve the Strength of the paper
- Reduce the stiffness
- Decrease the paper dust
- Increase the resistivity of paper against the water and other liquids penetrations
- Decrease the porosity of the paper sheet
- Improves the printing ability and ink compatibility of the paper.
- Enhance the paper permeability
- Improve the surface intensity of paper
Take care when using size press starch as surface additives chemicals. It is generally very hot in nature and can cause burns. Also, use the appropriate quantity of the press size additives to get the best results.