The pulp freeness or slowness tester are extremely sensitive apparatus while applied effectively. Freeness of pulp is a measure of precisely how rapidly water can drain from a diluted fiber furnishes suspension. Drainage rate is related to the surface conditions and swelling of the Read more
Paper forming consists essentially of removing water from a dilute suspension of fiber and other materials by filtration, leaving the solids in form of a coherent sheet. Clearly, the rate and separation effectiveness of this water removal from paper fiber webs is significant to the Read more
Showers are used in paper machine mainly cleaning purpose. It is also used for coating, moisturizing, lubricating, bleaching, edge trimming and other functions. All the section in paper machine needs shower. Wire cloth should be free from contaminants in order to keep sufficient open area for Read more
Pulper is used in different work place but in this topic we discuss about the pulper which is used in paper industries. It is called the heart of the repulping operation. Paper pulper is used for crushing virgin pulp (slabs or sheets), wastepaper processing, machine broke, deinking and pulp Read more
Posted in pulper
Rosin is acidic type sizing agent. In paper mill usually it is used as internal sizing agent. Rosin and its derivatives are cheap to produce and produced from regenerative raw materials. Hence these sizing agents are still a good number widely used of all wet-end sizing agents. Another source of Read more
Alkenyl Succinic Anhydride (ASA) is basic or neutral type sizing agent. It is wax like chemicals. ASA is used as internal sizing chemicals for paper. Structurally, it is unsaturated linear chain having five-membered anhydride ring and it is synthesized from Alfa-olefins and maleic anhydride. The Read more
Alkyl ketene dimer (AKD) is most common neutral/ alkaline sizing agent. It is an Internal sizing agents. Structurally, it is unsaturated lactones and it is synthesized from fatty acids. Physically it is waxy like milky emulsion chemicals. The waxy solid tiny particles (0.5–2 mm) are dispersed Read more
What is kaolin clay or china clay?
Kaolin clay is a dominant paper filler material which is derived from koalinite. It is also known as china clay, since the mineral primarily found in kao-ling, china. Another name of kaolin clay is white clay or light clay or heavy clay. The chemical formula of Read more
Titanium dioxide is an excellent filler material for paper mill industries. In spite of its all advantages, the uses of titanium dioxide are limited due to its exclusive price and high abrasive. It is used in such good quality papers that need high opacity, higher brightness and whiteness such as Read more
Amphoteric starch is a modified starch that contains positively and negatively charged substituent groups. It is used as wet-end additives, surface sizing agent and coating agent in the paper mill industries.
In the paper making process several materials are anionic such as wood fibers, titanium Read more