NZQA Expiring unit standard
8405 version 9
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Title
Demonstrate knowledge of vegetable leather wet post tannage
processes
Level
4
Credits
Purpose
6
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: wet post tannage stages used in vegetable
leather manufacture; chemistry of wet post tannage stages
used for vegetable leather manufacture; vegetable leather wet
post tannage methods; and dyed vegetable leather product
properties.
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 wet post tannage stages used in vegetable leather
expiring
manufacture.
Outcome 1
Evidence requirements
1.1
Wet post tannage stages are described in correct sequence in terms of their
purpose in achieving specified finished leather properties.
Credit
Merit
1.2
four of the following – stripping, clearing, bleaching, retanning,
dyeing, fatliquoring.
plus one other.
Wet post tannage machinery used for vegetable leather manufacture is
described in terms of operation and function.
Credit
process vessel plus two others which may include but are not
limited to – sammer, splitter, shaver, setter, roller.
Primary Industry Training Organisation
SSB Code 101558
 New Zealand Qualifications Authority 2016
NZQA Expiring unit standard
Merit
8405 version 9
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plus one other.
Outcome 2
Demonstrate knowledge of chemistry of wet post tannage stages used for vegetable
leather manufacture.
Evidence requirements
2.1
Chemical mechanism of wet post tannage stages is described in terms of the
chemicals used and their interaction with the vegetable leather.
Credit
Merit
2.2
Vegetable leather dyestuffs are described by type and their properties that
influence finished vegetable leather.
Credit
Merit
2.3
three, which may include but are not limited to any of – acid, basic,
direct, premetallised.
plus one other.
Vegetable leather fatliquoring agents are described by type and their properties
that influence finished vegetable leather.
Credit
Merit
2.4
two of the following – stripping, clearing, bleaching, retanning,
dyeing, fatliquoring, currying.
plus one other.
three of the following – cationic, amphoteric, sulphated, sulphited,
sulphonated, currying oil.
plus one other.
Vegetable leather retanning agents are described by type and properties that
influence finished vegetable leather.
Credit
Merit
Outcome 3
This
unit
two of the
following –standard
vegetable tan, mineral tan,is
syntan.
plus one other.
expiring
Demonstrate knowledge of vegetable leather wet post tannage methods.
Evidence requirements
3.1
Vegetable leather wet post tannage processes are described in terms of the
tannery practices used for the manufacturing of different vegetable leather
types.
Credit
Merit
3.2
one, which may include but is not limited to any of – upholstery,
upper, sole, saddlery, belt, industrial.
plus one other.
Factors that influence dye levelness in vegetable leather are described in terms
of wet post tannage methods.
Primary Industry Training Organisation
SSB Code 101558
 New Zealand Qualifications Authority 2016
NZQA Expiring unit standard
8405 version 9
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four of the following – levelling agents, hide and skin uniformity,
dyestuff properties, temperature, pH, float, mechanical action,
process control.
plus two others.
Credit
Merit
Outcome 4
Demonstrate knowledge of dyed vegetable leather product properties.
Evidence requirements
4.1
Dyed vegetable leather product properties are described in relation to their
suitability for leather product uses.
four of the following – light fastness, rub fastness, water
proofness, water spotting, perspiration fastness, strength, stretch,
abrasion resistance.
plus two others.
Credit
Merit
Replacement information
This unit standard has been replaced by unit standard
27902.
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
Revision
Review
1
24
Septemberstandard
1996
31 December
This
unit
is2015
2
16 September 1997
31 December 2015
3
27 April
2000
31 December 2015
expiring
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.
Primary Industry Training Organisation
SSB Code 101558
 New Zealand Qualifications Authority 2016
NZQA Expiring unit standard
8405 version 9
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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.
This unit standard is
expiring
Primary Industry Training Organisation
SSB Code 101558
 New Zealand Qualifications Authority 2016