Cobb value of different papers
WebPulp properties: Pulps prepared for each waste paper had different freeness degrees as revealed by Shopper Riegler (SR°) test and observed when handsheets were being formed.Values obtained were 50, 40, 80, 60 SR° for office paper, old corrugated, magazine and newspaper respectively. Some pulps required remarkably longer time to settle down …
Cobb value of different papers
Did you know?
WebDec 1, 2024 · The paper samples were substrate to be in contact with 100 mL of distilled water for 60 s. The weight of the water before and after contact and the difference between these weights were taken to obtain the Cobb 60 value. The oil resistance of the paper samples was measured by kit rating test according to the Chinese Standard GB/T … Webreferred as cobb value). In this, the quantity of water absorbed by a specified area of paper surface when in direct contact with water over a period of time is measured. Test Method : The details are given in IS : 4006 – Part – I, 1987. (f) Breaking Length Significance : It signifies that when a paper roll is hanged and allowed to fall,
WebFeb 19, 2024 · Cobb test (sized papers and paperboards) The Cobb test determines the amount of water absorbed into the surface by a sized (non-bibulous) paper, paperboard, … WebTest papers were produced and Cobb values (water absorptiveness), some mechanical and optical properties of the papers were determined. ... 0.2%, 1% and 2% o.d.f. Paper samples of different ...
WebThe Kit test is used to quantify or compare the performance of papers and boards, used for food contact and other packaging applications where resistance to grease staining is important. The test measures the degree of repellence or anti-wicking of paper and boards which have been treated with fluorochemical sizing agents used to prevent ... WebCobb values of the fluting papers applied Topsize RD44 and DMDHEU were given in Table 1. The Cobb values were obviously decreased by using Topsize RD44 and when compared with control (1) and 25% ...
Webprocess due to environmental concerns and government regulations. In this paper, bamboo pulps from the two bleaching processes were compared with the NBSK process as reinforcing fibers in fine paper. Criteria for a reinforcement fiber include providing good runnability for both paper manufacturing and converting operations, which require
WebOct 26, 2016 · When compared with PP papers, corrugating medium test (CMT), corrugated crush test, and ring crush test (RCT) values of SP papers (100 g/m 2) were increased about 18.3%, 25.7%, and 41%, … rtm with primaset pt-30WebDec 1, 2016 · The Cobb value based on these experiments is defined as the change in the weight (in grams per meter 2) as shown in Eq. (2). (2) Cobb value (gsm) = final paper … rtm windows meaningWebGet Cobb Value of Kraft Paper with Standardized Test Kraft paper with its various qualities is used for multiple applications which include, Paper sack for cement, food, chemical … rtm world cup 2022WebThe higher the value the stiffer the paper. Droop Rigidity MD: Droop rigidity measures the stiffness of the paper or board, more often applied to lighter weight grades. CD refers to cross direction, and MD to machine direction, Droop rigidity is higher in the machine direction. The higher the value the stiffer the paper. rtm xl twitterWebDec 27, 2024 · What is Cobb in paper board? Cobb test (sized papers and paperboards) The Cobb test determines the amount of water absorbed into the surface by a sized (non-bibulous) paper, paperboard, and corrugated fibreboard paper or paperboard sample in a set period of time, usually 60 or 180 seconds (Cobb60 or Cobb180). Water absorbency … rtm with examplesWebThe high Cobb value of the papers and cardboards indicates the ability of the materials to retain or absorb the moisture. Depending upon the application of the board, the Cobb value needs to be maintained. The test includes examining of the quantity of water absorbed in a particular period of time by non-bibulous paper having a thickness of 0.1 mm. rtm wire51 packWebThis is an equipment to determine the water absorption property of paper, paper board and corrugated fibreboard. Example: - A new currency note has a very low COBB Value. i.e. … rtm workshop