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Engineering Session 2

Session chair: Haaser, Beate, Dr (SÜDLEDER GmbH & Co. KG, Rehau, Germany); Lovato, Giancarlo, (L’Associazione Italiana Chimici del Cuoio (AICC), Santa Croce sull´Arno, Italy)
Shortcut: MA2
Date: Thursday, 27 June, 2019, 11:05 AM – 12:30 PM
Room: Hall 1/2
Session type: Technical Session


Click on an contribution to preview the abstract content.

11:05 AM MA2-01

COLD MILLING: innovative temperature/humidity control on milling operation. (#39)

A. Peruzzi1, A. Galiotto1

1 Erretre spa, Arzignano, Italy


Air temperature and humidity are fundamental in the milling operation. There is a complicated correlation between air conditions and leather moisture that is practically impossible to predict in industrial process.

Many important characteristics like softness, grain, pebble, yield depend on leather moisture.

This patented system is the latest improvement in milling drums technology that keeps the leather cooler and allows a precise and optimal humidity control.

Designed for soft, tight-grained leathers, especially from organic tannages and opened to a wide range of new operating conditions impossible with traditional machinery.

The original new design makes the milling drum completely independent from the outside environment with many advantages: consistency over seasons, shorter transition time, energy savings.  

The original design is recognized by international patent, laboratory results on leather will be displayed during the presentation.



The original new Cold Milling technology design makes the milling drum completely independent from the outside environment with many advantages: consistency over seasons, shorter transition time, energy savings. 
Nappa leather and all tight-grained leathers, especially organic tannaed, are beneficiary of this new technology.


Keywords: milling drum, finishing, technology, machinery
11:20 AM MA2-02

Premium class leather quality - From tanning over embossing to perforating (#302)

J. P. Hildebrand1

1 Ring Maschinenbau GmbH, Pirmasens, Rhineland-Palatinate, Germany


The frame conditions to produce leather in the western civilisation is regulated by strict legislation. The keywords are pollution, CO2-Footprint, Chrome, toxic effluent, animal protection and working conditions. Thus it makes no sense for tanneries of the western civilisation to try to be globally successful in the cheap price leather segment. But what does it take to be a top tannery? With this presentation we want to paint a picture of what it takes to cath up with the top tanneries, what makes the difference of producing high quality leather and how to change the point ov view from the dirty tannery to the world's eldest recycling business.

Therefore we show solutions from the tanning point of view over the possibilites to grade up leather over embossing to perforating. Moreover we want to declare that tanning is not a dirty, stinky industry but the eldest recylcing field in the world, producing great and innovative products. It is the most intigrated industry in the world - no animal has to die for leather. Imagine the story of fur, a fashionable and moreover from the functional point of view unbeatable product which has almost disappeared from the market. Tanneries should do proactive marketing to show how innovative modern tanneries are working and should present products which blow the customers away. 


1. Possibilites to produce high quality leahter from tanning over embossing to perforating

2. Why and how to change the picture of the modern tannery to be stinky, dirty and polluting to a modern, innovative, recycling industry with a long lasting history 

Keywords: Tanning, Embossing, Perforating, High Quality, Improvement
11:35 AM MA2-03

Automatic Leather Species Identification using Machine Learning Techniques (#261)

M. Jawahar1, S. V. Kanth1, V. Rajangam1, T. Selvi1

1 Central Leather Research Institute, Leather Process Technology, Chennai, India


Identification and classification of leather species becomes valuable and necessary due to concerns regarding consumer protection, product counterfeiting, and dispute settlement in the leather industry. Identification and classification of leather into species is carried out by histological examination or molecular analysis based on DNA. Manual method requires expertise, training and experience, and due to involvement of human judgment disputes are inevitable thus a need to automate the leather species identification. 

In the present investigation, an attempt has been made to automate leather species identification using machine learning techniques. A novel non-destructive leather species identification algorithm is proposed for the identification of cow, buffalo, goat and sheep leathers. Hair pore pattern was segmented efficiently using k-means clustering algorithm Significant features representing the unique characteristics of each species such as no.of hair pores, pore density, percent porosity, shape of the pores etc., were extracted.  The generated features were used for training the Random forest classifier.

Experimental results on the leather species image library database achieved an accuracy of 87 % using random forest as classifier, confirming the potentials of using the proposed system for automatic leather species classification.


Novel technique to identify leather species

Non destructive method 

Machine learning algorithms to automate leather species identification

Keywords: Leather species identification, Surface morphological characteristics, Hair pore pattern, Image analysis
11:50 AM MA2-04

Personal Assistent vs basic sewing machine - The new generation of intelligent sewing systems (#306)

M. Schäfer1

1 Dürkopp Adler AG, Bielefeld, North Rhine-Westphalia, Germany


The presentation takes up the question of how the sewing area has changed in leather processing. What are the challenges facing the sewing industry in the leather processing sector? How are these challenges taken up and solved by Dürkopp Adler? How do future proposals for solutions look like and what role does industry 4.0 play in this? The sewing machine of the future offers interfaces to the various functional areas and serves as an assistant in modern production. The industrial sewing machine becomes smarter and support the seamstress in her work. The sewing machine of the future is no longer just an operating medium, but also acts as a medium of knowledge.


- Changes in the world wide production of leather products (f.ex. difficult to find skilled workers)

- Sewing machines of the future know the needs of the operators and support them in their daily work

- Sewing systems of the future acts as an interface between the operators, the whole value-added chain in the production and the leather product

Keywords: Smart sewing systems, Industry 4.0, holistic view of the production
12:05 PM MA2-05

Go Digital: Accelerate Industry 4.0 in the Leather Cutting Room (#254)

H. Max-Lang1

1 Lectra Deutschland, Ismaning, Bavaria, Germany


Automotive original equipment manufacturers (OEMs) have the reputation of being demanding customers, insisting that all suppliers make important progress in operational efficiency year after year, passing a proportion of the savings on. They encourage lean thinking and supply chain excellence and insist that suppliers, including tanners, capture and share important data.

Advanced automated cutting systems can help tanners by allowing them to achieve overall efficiency gains in their operations, meet customer requirements more fully and, even if they make only a small margin on cutting, strengthen their core business of convincing OEMs to include leather in their design specifications for new and existing models.

For example, automated nesting software combined with high-precision scanning and cutting tools save a significant amount of leather compared to die presses. A streamlined workflow – thanks to automatic conveyor advance – increases production capacity and enables suppliers to give their customers the products they want at the highest level of quality.

These technologies are a means to adapt much faster to changes that OEMs are making to their offerings as they tailor their products to the needs and tastes of customers around the world. For some tanners, computerized cutting machines would make it possible for them to start running a cutting operation for the first time, while for others the higher yield rate and lower volumes of waste that the technology promises could give them the confidence to move upmarket and begin working with higher-quality hides.

High-end technology is also an important source of data, which gives OEMs greater production data transparency and in-depth insight into leather-producing operations, but also provides the tanners with potentially crucial evidence and support if disputes arise with OEMs or, more likely, their tier-one seating suppliers.

Change is always difficult, therefore Lectra aims to provide value for money and pledge to help tanners make the organizational and cultural changes required to use the technology well. There is an invitation to tanners to become more fully players in the twenty-first-century, digital economy.


Cutting Room

Industry 4.0


Keywords: Cutting Room, Industry 4.0, Digitization