Demonstrate knowledge of wool and the wool scouring process

Transcription

1 Demonstrate knowledge of wool and the wool scouring process 2444 version 6 Page 1 of 5 Level 4 Credits 4 Purpose This unit standard is for people working in scouring or a related industry. People credited with this unit standard are able to describe the types of wools processed in New Zealand and the mechanical principles, operation and functions of the plant used in wool scouring. Subfield Domain Status Textiles Manufacture Wool Scouring Registered Status date 25 January 1995 Date version published 18 July 2008 Planned review date 31 December 2010 Entry information Accreditation Standard setting body (SSB) Open. Evaluation of documentation and visit by NZQA and industry. Competenz Accreditation and Moderation Action Plan (AMAP) reference 0030 This AMAP can be accessed at Special notes 1 Information to support the learning required for this standard can be obtained from papers and articles published by AgResearch. These may be obtained from AgResearch at 2 Canesis Network Ltd, originally Wool Research Organisation of New Zealand (WRONZ), is now called AgResearch Textiles.

2 Page 2 of 5 Elements and performance criteria Element 1 Demonstrate knowledge of wool production and disposal in New Zealand. 1.1 Properties of wool are described in terms of the benefits/disadvantages each property contributes to end-products. resilience, water absorption, abrasion resistance, fibre crimp, flame resistance, resistance to soiling. 1.2 New Zealand sheep breeds are identified and their wools described in terms of seasonal availability and end-use. Romney, Perendale, Coopworth, Corriedale, Halfbred, Merino, Drysdale. 1.3 Wool processing systems are described in terms of their processing sequence. woollen, semi-worsted, worsted. 1.4 Yarn types are described in terms of their characteristics and end-use categories. types woollen, semi-worsted, worsted; end-use categories carpets, hand knitting, knitwear, woven fabrics. Element 2 Demonstrate knowledge of impurities found in wool and describe methods for their removal. 2.1 Impurities found in greasy wool are described in terms of type and origin. natural, acquired, applied. 2.2 Reasons for opening and dusting greasy wools are described. improvements in subsequent processing, improved scouring, reduced liquor usage and effluent loading. 2.3 Wool openers are described and compared in terms of their function and cyclic opener, double drum opener, step opener-blender, short wool processor, decotter.

3 Page 3 of 5 Element 3 Demonstrate knowledge of wool conveying systems. 3.1 Mechanical wool conveying equipment is described and compared in terms of function, operation, and advantages/disadvantages. belts, mesh mats, spiked lattices. 3.2 Pneumatic wool conveying equipment is described in terms of function and 3.3 Shirley wheel and double drum condenser are described in terms of their function and 3.4 Reasons for removing dust from air and methods of removing dust are described. methods bag filters, cyclone gravity discharge; reasons environmental, contamination, cleanliness. Element 4 Demonstrate knowledge of scouring systems. 4.1 Scouring systems are identified and described in terms of their operating principles. solvent scouring, suint (Duhamel), WRONZ Comprehensive Scouring System, aqueous. 4.2 Scouring systems are compared in terms of advantages and disadvantages of each system. solvent scouring, suint (Duhamel), WRONZ Comprehensive Scouring System, aqueous. 4.3 Liquor treatment loop is described in terms of function and WRONZ Liquor Treatment Loop, other treatment equivalents.

4 Page 4 of 5 Element 5 Demonstrate knowledge of wool drying. 5.1 Regain and moisture content are defined according to industry standard definitions. 5.2 Drying principles are described in terms of dryer 5.3 Dryer control is described in terms of methods and equipment used. temperature, moisture measurement, humidity. 5.4 Dryer energy supply and use is described in terms of energy source, safe handling procedures, and advantages/disadvantages in use. gas, steam. Element 6 Demonstrate knowledge of pressing and packing wool. 6.1 Wool presses used in wool scouring are described in terms of their function and conventional, dump, high density. 6.2 Wool presses are compared in terms of advantages and disadvantages. conventional, dump, high density. 6.3 Packing material types used for wool are described and compared in terms of advantages and disadvantages. jute, polypropylene. 6.4 Banding of bales is described in terms of the factors that affect the banding band configuration, band thickness, band length. 6.5 Bale branding techniques are identified and compared in terms of advantages and disadvantages in use.

5 Page 5 of 5 Please note Providers must be accredited by NZQA, or an inter-institutional body with delegated authority for quality assurance, before they can report credits from assessment against unit standards or deliver courses of study leading to that assessment. Industry Training Organisations must be accredited by NZQA before they can register credits from assessment against unit standards. Accredited providers and Industry Training Organisations assessing against unit standards must engage with the moderation system that applies to those standards. Accreditation requirements and an outline of the moderation system that applies to this standard are outlined in the Accreditation and Moderation Action Plan (AMAP). The AMAP also includes useful information about special requirements for organisations wishing to develop education and training programmes, such as minimum qualifications for tutors and assessors, and special resource requirements. Comments on this unit standard Please contact Competenz info@competenz.org.nz if you wish to suggest changes to the content of this unit standard.