Objective of Sizing, The Passage of Material on Two Cylinder Slasher Sizing Machine

     Objective of Sizing,The Passage of Material On Two Cylinder Slasher Sizing Machine.

Objective of Sizing:-

• To improve the weaveablity of yarn by applying a uniform coating on the yarn surface so that hair yarn laid on the yarn surface.
• To improve the abrasion resistance to protect the warp against all stress and strain during weaving
• To improve the strength of yarn by cementing action 
• To reduce hairiness by laying down the protruding fibre along the yarn surface 
• To reduce static charge generation. 

Passage material through on two cylinder slasher sizing machine 

 

Passage:- 

 

    The yarn is wound on section beam in parallel order in the previous preparatory operation of warping. Usually each section beam contain about 500 To 600 thread called “Eads”. The section beams called   the warper’s beams or simply as “back Beams” are placed in a stand called “creel”. The warp ends from each section beam are group and down forward. Being passed under and over the other beams, over and under the guide roller and into the size box.

   

    The sheet of yarn is entered into the size paste, which is kept at near boiling temp by injecting steam directly into it through a perforated copper or galvanised iron steam pipe. The warp partially encircles on immersion roller, while passing through the size paste and then passes into the nip formed by the “Size Roller” and the “Squeeze Roller”.    

   

    There is minimize of one pair of these in assize box. The squeeze roller presses in the size paste in to the yarn. Structure of it presses out external excessive size paste and at the same time drag the warp sheet through the paste.

 

    The yarn loaded with the wet size then passes through the section comprising the drying arrangement, either two cylinder or multi-cylinder or hot chamber, where in the yarn dried, usually the drying is controlled  to a predetermined moisture content. Thus avoiding overheating of the warp. The last cylinder range is usually kept cool so that the warp sheet is cooled when it leave the drying range.

 

    The next step is to split up the warp sheet by means of split roads, into as many section as there are beams in the creel. The warp the passes through an “expansion Comb” which regulates its width and after passing between the nip of a “drag roller” and a “nip roller” is finally wound on a beam called the weaver’s Beam. This front portion of the sizing machine consisting of the section after the drying range is called the “head stock”. It combines numerous auxiliary device such as full speed and crawl speed device or length indicator, measuring and marking motion and a pressing roller device on compress the yarn completely on the weaver’s beam.

 

    There has to be also a driving motion to rotate the weaver’s beam at different RPM from the start to the end of the beam to accommodate the increasing circumference of the beam.