NZQA Expiring unit standard
8401 version 9
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Title
Demonstrate knowledge of pretannage processes for bovine hides
Level
4
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 hide leather
manufacture; chemical mechanism of pretannage stages;
pretannage hide and skin characteristics; and potential damage
associated with 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 a credit have been met.
Outcomes and evidence requirements
Outcome 1
This unit standard is
Evidence requirements
expiring
Demonstrate knowledge of pretannage stages used in hide leather manufacture.
1.1
Pretannage stages are described in correct sequence in terms of purpose.
Range
1.2
Pretanning processes are described in terms of tannery practice.
Credit
Merit
1.3
soaking, unhairing, liming, deliming, bating, pickling.
two processes for unhairing and two processes for deliming.
plus two processes for one other pretannage stage.
Pretannage machinery is described in terms of mechanical principle and
function.
Credit
Merit
two, which may include but are not limited to any of – flesher,
splitter, drum, processor.
plus one other.
Primary Industry Training Organisation
SSB Code 101558
 New Zealand Qualifications Authority 2016
NZQA Expiring unit standard
8401 version 9
Page 2 of 3
Outcome 2
Demonstrate knowledge of chemical mechanism of pretannage stages.
Evidence requirements
2.1
Chemical mechanism of pretannage processes is described in terms of
chemical interaction with skin system and modifications to skin system
achieved.
Credit
Merit
2.2
three of the following – soaking, unhairing, liming, deliming, bating,
pickling.
plus two others.
Process control of pretannage chemistry is described in terms of standard
tannery practice.
Credit
Merit
three of the following – soaking, unhairing, liming, deliming, bating,
pickling.
plus two others.
Outcome 3
Demonstrate knowledge of pretannage hide and skin characteristics.
Evidence requirements
3.1
Pretannage hide and skin characteristics are described in terms of alterations to
hide that are relevant to leather qualities.
Credit
Merit
Outcome 4
three of the following – flatness, opening up, looseness, grain
cleanliness, thermal stability.
plus one other.
This unit standard is
expiring
Demonstrate knowledge of potential damage associated with incorrect pretannage
processing.
Evidence requirements
4.1
Potential damage arising from incorrect pretannage processing are described in
terms of faults in leather.
Replacement information
Primary Industry Training Organisation
SSB Code 101558
This unit standard has been replaced by unit standard
27899.
 New Zealand Qualifications Authority 2016
NZQA Expiring unit standard
8401 version 9
Page 3 of 3
This unit standard is expiring. Assessment against the standard must take place by
the last date for assessment set out below.
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.
This unit standard is
Requirements for consent to assessexpiring
and an outline of the moderation system that applies
to this standard are outlined in the Consent and Moderation Requirements (CMR). The
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.
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