NZQA Expiring unit standard
8402 version 9
Page 1 of 3
Title
Demonstrate knowledge of pretannage processes for woolskins
Level
3
Purpose
Credits
5
This unit standard is for people new to the leather industry or
those 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; chemical mechanism of woolskin pretannage
stages; woolskin pretannage effects on end product
characteristics; and potential damage to woolskin product from
incorrect pretannage processing.
Classification
Leather Manufacturing > Leather Manufacture Technology
Available grade
Achieved and Merit
Explanatory notes
Version 3 of this unit standard introduced criteria for merit. Wherever a merit requirement
appears in this unit standard it assumes that the requirements for credit have been met.
Outcomes and evidence requirements
This unit standard is
Demonstrate knowledge of pretannage stages used in woolskin manufacture.
expiring
Evidence requirements
Outcome 1
1.1
Woolskin pretannage chemical stages are described in correct sequence in
terms of their purpose.
Credit
Merit
1.2
two, which may include but are not limited to any of – soaking,
scouring, pickling, preliminary tannage.
plus one other.
Woolskin pretannage machinery is described in terms of mechanical principle
and function.
Credit
Merit
three, which may include but are not limited to any of – flesher,
wet shearer, de-burrer, hydroextractor, process vessel.
plus one other.
Primary Industry Training Organisation
SSB Code 101558
 New Zealand Qualifications Authority 2016
NZQA Expiring unit standard
8402 version 9
Page 2 of 3
Outcome 2
Demonstrate knowledge of chemical mechanism of woolskin pretannage stages.
Evidence requirements
2.1
Chemical mechanism of woolskin pretannage stages is described in terms of
effects of reagents on skin and/or wool.
Credit
Merit
2.2
three of the following – soaking, scouring, bleaching, pickling,
preliminary tannage.
plus one other.
Woolskin pretannage chemistry is described in terms of practical process
control.
Credit
Merit
three of the following – soaking, scouring, bleaching, pickling,
preliminary tannage.
plus one other.
Outcome 3
Demonstrate knowledge of woolskin pretannage effects on end product characteristics.
Evidence requirements
3.1
Woolskin pretannage effects are described in terms of their influence on leather
and/or wool properties.
Credit
four, which may include but are not limited to any of – wool length,
wool colour, matting, softness, wool grease, skin grease, suede
quality.
plus one other.
This unit standard is
Outcome 4
expiring
Demonstrate knowledge of potential damage to woolskin product from incorrect
Merit
pretannage processing.
Evidence requirements
4.1
Potential damage arising from incorrect pretannage processing are described in
terms of faults in woolskin product.
Replacement information
This unit standard has been replaced by unit standard
27895.
This unit standard is expiring. Assessment against the standard must take place by
the last date for assessment set out below.
Primary Industry Training Organisation
SSB Code 101558
 New Zealand Qualifications Authority 2016
NZQA Expiring unit standard
8402 version 9
Page 3 of 3
Status information and last date for assessment for superseded versions
Process
Version Date
Last Date for Assessment
Registration
1
24 September 1996
31 December 2015
Revision
2
16 September 1997
31 December 2015
Review
3
27 April 2000
31 December 2015
Revision
4
20 February 2002
31 December 2015
Revision
5
14 October 2004
31 December 2015
Review
6
14 December 2007
31 December 2015
Review
7
21 February 2013
31 December 2015
Rollover
8
20 March 2015
31 December 2017
Rollover
9
17 September 2015
31 December 2018
Consent and Moderation Requirements (CMR) reference
0185
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.
This unit standard is
expiring
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.
Primary Industry Training Organisation
SSB Code 101558
 New Zealand Qualifications Authority 2016