Page 1 of 3
Title / Evaluate pretannage processes for woolskins
Level / 5 / Credits / 5
Purpose / This unit standard is for experienced people wishing to develop their technical skills in leather manufacture.
People credited with this unit standard are able to: demonstrate knowledge of pretannage stages used in woolskin manufacture; evaluate chemical mechanism of woolskin pretannage stages; evaluate woolskin pretannage effects on end product characteristics; and evaluate potential damage to woolskin product from incorrect pretannage processing.
Classification / Fellmongery and Leather Processing > Leather Processing Knowledge
Available grade / Achieved
Explanatory notes
None.
Outcomes and evidence requirements
Outcome 1
Demonstrate knowledge of pretannage stages used in woolskin manufacture.
Evidence requirements
1.1 Woolskin pretannage chemical stages are outlined in correct sequence in terms of their purpose.
Range evidence is required of two, which may include but are not limited to any of – soaking, scouring, pickling, preliminary tannage.
1.2 Woolskin pretannage machinery is outlined in terms of mechanical principle and function.
Range evidence is required of three, which may include but are not limited to any of – flesher, wet shearer, de-burrer, hydroextractor, process vessel.
Outcome 2
Evaluate chemical mechanism of woolskin pretannage stages.
Range evidence is required of three of the following – soaking, scouring, bleaching, pickling, preliminary tannage.
Evidence requirements
2.1 Chemical mechanism of woolskin pretannage stages is evaluated in terms of effects of reagents on skin and/or wool.
2.2 Woolskin pretannage chemistry is evaluated in terms of practical process control.
Outcome 3
Evaluate woolskin pretannage effects on end product characteristics.
Evidence requirements
3.1 Woolskin pretannage effects are evaluated in terms of their influence on leather and/or wool properties.
Range evidence is required of four, which may include but are not limited to any of – wool length, wool colour, matting, softness, wool grease, skin grease, suede quality.
Outcome 4
Evaluate potential damage to woolskin product from incorrect pretannage processing.
Evidence requirements
4.1 Potential damage arising from incorrect pretannage processing is evaluated in terms of faults in woolskin product.
Replacement information / This unit standard replaced unit standard 8402.Planned review date / 31 December 2017
Status information and last date for assessment for superseded versions
Process / Version / Date / Last Date for Assessment /Registration / 1 / 21 February 2013 / N/A
Consent and Moderation Requirements (CMR) reference / 0033
This CMR can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Please note
Providers must be granted consent to assess against standards (accredited) by NZQA, before they can report credits from assessment against unit standards or deliver courses of study leading to that assessment.
Industry Training Organisations must be granted consent to assess against standards by NZQA before they can register credits from assessment against unit standards.
Providers and Industry Training Organisations, which have been granted consent and which are assessing against unit standards must engage with the moderation system that applies to those standards.
Requirements for consent to assess and an outline of the moderation system that applies to this standard are outlined in the Consent and Moderation Requirements (CMR). The CMR 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 the Primary Industry Training Organisation if you wish to suggest changes to the content of this unit standard.
Primary Industry Training OrganisationSSB Code 101558 / Ó New Zealand Qualifications Authority 2014