In 2006, during NPN's Strategic Development process, we made the decision to try and mprove and add value to semi-processed ovine production. Ovine being the most problematic, NPN felt that for New Zealand to compete against other international materials /substrates, we needed a point of difference in the market .

The industry knows that a major problem with New Zealand pelts is that they have a tendency to have some looseness between the grain and corium layers and this became our target point to improve.

This was the beginning of the Kiwitan Process, which has helped to overcome this problem and has lead onto our  Britewool™ process .


Albrite AD Benefits

KWIKTAN  Process

Britewool Process

Kiwitan Process

Feature Benefit

• Water Based Easy to Handle

• Compatible with most other process chemicals

• Easily adaptable to existing chemicals and processes

• Produces white hides/pelts Multifunctional wet end product produced

• High affinity with dyestuffs Reduced dye offers required, reduced dye leaching. Excellent light-fastness

• Increased process speed (reduced retannage time)

• Increased throughput

• Outstanding environmental profile

• Reduced effect on effluent/environment

• Easily monitored Selenium indicator for skin penetration. Iodine titration for float exhaustion

• Superior grain tightening Improves quality/appearance of finished leather. Tightens excessively loose skins, e.g. ‘casualty cows’

• Superior perspiration resistance Ideally suited for use in gloving and shoe leather processes as replacements for aldehydes and vegetable tannins

• High Shrinkage temperatures Allows good shaving and splitting

A True Wet White

Unlike other organic tanning agents, Albrite tanning agents give a true wet white.

KWIKTAN: Reduced process time for hides of equal quality

• Removal of Non Emulsifiable Phospholipids with the use of Enzyme in Liming

• Even Lime Penetration through both Grain and Flesh Layers, reducing Draw and less pronounced Growth marks in necks.

• Reduced Sulphide offer

• Reduced liming Time as well as following process steps

• Improved Grain quality, more Intact

• Cleaner Wet Blue

• Reduced process time  allowing increased Plant Capacity

This process has been developed and fine tuned in Bulk Production by NPN Technical Staff at several NZ tanneries over the past 12 months. In all cases Matched Sides have been used to evaluate the results, this takes away any Subjective comments about the results.

These matched sides have been evaluated in the Wet Blue and Dyed crust for physical appearance as well as general handle. Analytical testing has also been completed on Grease levels, Physical properties as well as the opening up of the fibre structure. In all cases the KWIKTAN Process (Hair Burn and Hair Save) has performed as well as the Standard conventional process and in most cases has exceeded the standard level of quality achieved with a conventional system.




Britewool™: The Eco Preservation for Woolskins (NZ pat Application No 584249)

Sheepskins have been preserved by salting since time immemorial, but the disposal of salt by the tannery, especially in drier climates or inland, is problematic and very expensive.  Salt, however is inexpensive, a usable commercial alternative has proven to be elusive!

The Britewool™ process delivers a skin fully protected, pre-tanned with a Ts of 75ºC at a cost comparable to traditional salting which still essentially produced only raw skin.  This is achieved by utilising a small quantity of a relatively expensive Eco-friendly organic chemical Albrite AD. (THPS)

• Britewool™ skins are delivered with a total absence of pollutants – salt and boric acid.  Wash liquors would be available for recycling  because of this point.

• Pelts are well presented having been green fleshed before the Britewool™ treatment.

• Britewool™ skins readily wet back even if dried out during storage.

• Britewool™ skins being pre-tanned, with a Ts circa 75ºC can be aqueous degreased at 50ºC.  This means that the need for dry cleaning can be greatly reduced which could reduce the amount of skin drying cycles .  Both points offering large energy and labour savings.

• Britewool™ skins are ready for further processing/re-tanning as with normal salted skins but are part-tanned, saving in chemical costs.

• Britewool™ skins can be fellmongered by normal sulphide procedures in the event that they prove to be unsatisfactory for wool on articles.

Our knowledge to date indicates that the Britewool™ process, as well as being suitable for ovine skins , can be used on all skins where the hair, wool or fur is to be preserved.


Advantages of Kiwitan for the Finished Leather Producer:

• Metal Free Shavings, can be added to fertilisers, potting mixes.

• Biodegradable.

• A uniform substrate for easy final grease removal.

• A uniform substrate giving a more level/even final tannage. Fuller bellies

• Kiwitan pelts are loaded into the retan vessel only once .

• Due to the weak Cationic nature of the Kiwitan pelts there is less skin to skin colour variation of the final article Eg. mixed loads possible due to the final tannage being imparted on the pelts during the dyeing stage.

• A fuller tighter leather with a more even substance is produced with no signs of overworked belly areas.

The reduced processing time and stabilisation of the collagen at an early stage of the process imparts these advantages along with less fluctuations of the pH.

Kiwitan processing is carried out at pH 3.0 > 7.0

Skin to skin colour variation is minimised due to the final charge of the tannage being imparted on the collagen during the second and final stage of processing through to dye.

Kiwitanned skins are able to be processed into vegtanned leathers for small goods, chrome tanned leathers for garments, white mineral free for garments and vegtanned and chrome leathers for shoe uppers. Recipes are available for these leathers together with technical support.

  • + OUR TEAM

    The staff of NPN Ltd all have extensive technical back grounds.


    Kelvin Pritchard:

    Manager/Director - 28 years in the Tanning Industry


    Robbie Bell:

    Technical Manager - 30 years in the Tanning Industry


    Neil Pritchard:

    Director - 41 years in the Tanning Industry


    Backed up by Steve Trantum:

    Marketing Manager TRUMPLER. Steve visits New Zealand 3 to 4 times per year.




NPN Limited

96 Anderson Rd, Whakatu, 4250, Napier.

© NPN Limited 2013 -2015  All rights reserved