An Overview of Yarn Clearer

An Overview of Yarn Clearer

Bhavdip Paldiya
Dept. of Textile Technology
Sarvajanik College of Engineering & Technology, Surat, India
Cell: +91 9662020909

Yarn Clearer
Yarn clearer is the device which is used to remove the following faults of yarn in order to increase the yarn quality and weaving efficiency.

Wilson Yarn Clearer
  • The occurrence of many slubs (thick place in yarn) in the yarn was well known to the weavers in the Hollins factory in Glasgow for they knew that much labor had to be spent after the weaving on “burling and mending” of the fabric in order to remove as many faults as possible. But in the spinning mill at Pleasley Vale yarn clearing was regarded as an undesirable and costly process. 
  • The yarn production people in Pleasley believed that their slub catchers were effective - it was obvious to them that a slub up to an eighth in diameter could not pass through a slot only 10 thousandths of an inch wide. They never saw the evidence of their erroneous belief since they did not see the woven fabric with the many slubs that had passed through their yarn cleaners. 
  • Peter Wilson realized that the true cost of the defective yarn clearing which was currently being practiced warranted the development of a better yarn clearer even if it cost as much as £5. The factory management, used to spending only a shilling or two on their yarn clearers held up their hands in horror at the thought of such an expense. There was some justification from their own narrow cost standpoint, but on an overall company view it was good business. 
    Wilson Yarn Clearer
  • Thomas Holt and Co, a Rochdale cone winding engine maker, agreed to promote the Wilson Yarn Clearer commercially and a production prototype was made and taken to Erricson Telephone Ltd (ETL) who agreed manufacture the device. Their unit price of £13 for an initial run of 2000 was achieved by using printed circuitry that was then in its infancy and initial order was placed for 2000 units.
  • In September 1958, Thomas Holt showed the Wilson Yarn Clearer at the International Textile Exhibition in Belle Vue, Manchester as the “Yarnspec”, which was believed to be the World’s first commercially viable yarn clearer. 
  • By about 1959 Thomas Holt had sold some 12 000 units but Thorn Bendix, a subsidiary of ETL dealing with textile applications, began production of a transistorized version which included some 12 or more transistors and superseded the much bulkier Yarnspec. A few years later sales of £400 000 p.a. were being achieved by Thorn Bendix and the era of electronic yarn clearing was well and truly born.
Faults of yarn
  • Thick and thin places
  • Slab and neps
  • Loose fabric
  • Foreign material
Types of Yarn Clearer
  1. Mechanical Type
  2. Electronic type
Mechanical Type
  • Conventional blunt type
  • Serrated blade type
Electronic type
Electronic yarn Clearers ensures excellent clearing to be obtained with minimum mechanical stress on the yarn. The places, not possible with the mechanical system are an additional feature of the electronic system. The tamper-proof central adjustment for several spindles leads to a significant saving of time.

Electronic Yarn Clearer Model Myc-2
Mill requirement of yarn clearing controls have been developed for various stages in spinning process to improve the quality of the end product, i. E. Yarn. For this we have piano type autoleveller at blow-room, giving more uniform lap, autolevellers at carding and drawframes to give more uniform sliver etc. But even with all these controls it is not possible to get 100% uniform yarn. The present concept of the yarn depends upon various parameters like count, twist, strength, evenness and nepiness. The definition of the quality yarn is incomplete until the yarn faults are taken into consideration and eliminated.

Capacitance type
Zellweger Uster completely re-invented the yarn clearer with its Quantum clearer. This new clearer is digital, has capacitive and optical sensing capability and gives yarn fault classification according to the Uster Classimate concept. The Uster Quantum clearer can be used in several different modes including: capacitive or optical sensing, capacitive and foreign matter sensing or capacitive and optical combined. Quantum has 100-percent digital electronics, self-calibrating measuring heads, and on-board diagnostics.

Photo electric type

Seletex is a photoelectric yarn clearer which detact and removes various yarn faults in spinning or silk yarn in re-winding process. Photoelectric detector many material , moisture yarn, electric conductors and others.

Comparison between mechanical and electronic clearer:
  • Electronic clearer are more sensitive than mechanical clearers
  • In case of mechanical clearers there is abrasion between yarn and clearer parts but in case of electronic clearers there is no such abrasion
  • Mechanical clearers do not prevent soft slab from escaping through clearer where as electronic type does not allow passing of any types of faults
  • Mechanical type does not break the thin places and the length of the fault is not considered
  • Mechanical clearer are simple and easy to maintain while the electronic clearers are costly and requires high standard of maintenance
USTER QUANTUM 3 is the third generation of the best-selling online quality assurance system for winding machines. These state-of-the-art yarn clearers use Smart Clearing Technology to optimize production efficiency and reduce costs for spinners.
  • The Jenntex Engineering Company
  • KVR Intexx
  • Industrial Electronic Corporation
  • R L Creations
  • Samosaran Yarns Pvt.Ltd.
  • Paras Engineering Co
  • Chiranjilal Spinners
  • Kirti Polytex Pvt Ltd
  • Xinghua City Guoan Electronics Co., Ltd.
  • STI India Ltd.
  • Danube Fashions Limited (Member - Technocraft Group) Wuhan Zhongbai Group Co., Ltd. 
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Mazharul Islam Kiron is a textile consultant and researcher on online business promotion. He is working with one European textile machinery company as a country agent. He is also a contributor of Wikipedia.

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