NZQA registered unit standard
27899 version 1
Page 1 of 3
Title
Evaluate pretannage processes for bovine hides
Level
5
Credits
Purpose
5
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 bovine hide leather
manufacture; evaluate chemical mechanism of pretannage
stages; evaluate pretannage hide and skin characteristics; and
evaluate potential damage associated with 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 bovine hide leather manufacture.
Evidence requirements
1.1
Pretannage stages are outlined in correct sequence in terms of purpose.
Range
1.2
Pretanning processes are explained in terms of tannery practice.
Range
1.3
stages include but are not limited to – soaking, unhairing, liming,
deliming, bating, pickling.
evidence is required of two processes for unhairing and two
processes for deliming.
Pretannage machinery is outlined in terms of mechanical principle and function.
Range
evidence is required of two, which may include but are not limited
to – flesher, splitter, drum, processor.
Primary Industry Training Organisation
SSB Code 101541
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
27899 version 1
Page 2 of 3
Outcome 2
Evaluate chemical mechanism of pretannage stages.
Evidence requirements
2.1
Chemical mechanism of pretannage processes is evaluated in terms of
chemical interaction with skin system and modifications to skin system
achieved.
Range
2.2
evidence is required of three of the following – soaking, unhairing,
liming, deliming, bating, pickling.
Process control of pretannage chemistry is evaluated in terms of standard
tannery practice.
Range
evidence is required of three of the following – soaking, unhairing,
liming, deliming, bating, pickling.
Outcome 3
Evaluate pretannage hide and skin characteristics.
Evidence requirements
3.1
Pretannage hide and skin characteristics are evaluated in terms of alterations to
hide that are relevant to leather qualities.
Range
evidence is required of three of the following – flatness, opening
up, looseness, grain cleanliness, thermal stability.
Outcome 4
Evaluate potential damage associated with incorrect pretannage processing.
Evidence requirements
4.1
Potential damage arising from incorrect pretannage processing is evaluated in
terms of faults in leather.
Replacement information
Planned review date
This unit standard replaced unit standard 8401.
31 December 2017
Status information and last date for assessment for superseded versions
Process
Version Date
Last Date for Assessment
Primary Industry Training Organisation
SSB Code 101541
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
27899 version 1
Page 3 of 3
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 standards@primaryito.ac.nz if
you wish to suggest changes to the content of this unit standard.
Primary Industry Training Organisation
SSB Code 101541
 New Zealand Qualifications Authority 2016