top of page

Leather fibres optimisation with the CRC dryers by FRATELLI CARLESSI

The treatment of morphological differences of the leather in the drying and conditioning phases

The tanning process is complex and requires great attention to detail to achieve the desired leather properties. Proper management of all steps in is therefore essential to achieve a quality end product as one mistake in any step can ruin it.

Fratelli Carlessi's CRC Cell Rotary Conditioner drying and conditioning systems are simply the best on the market to achieve a uniform and constant result. They guarantee the correct execution of the drying and conditioning phases, leading the customer towards the best possible yield of the leather.


The structural composition of leather

Hides and skins are a complex, layered material. They consist of three main components: the epidermis, the dermis and the subcutaneous tissue. The epidermis, the outermost layer, protects against external agents. The dermis, rich in collagen fibres, provides resistance and elasticity. The subcutaneous tissue acts as an insulator and energy reserve.

Detailed insight into leather morphology and directional properties

The leather varies greatly in thickness, firmness and resistance depending on its anatomical location.The neck area is characterised by numerous wrinkles and an irregular density, while the rump area shows great homogeneity. Finally, the flank area is usually distinguished by its less compactness and greater irregularity, affecting therefore its tensile strength. It is crucial to understand these differences if you want to optimise the drying process. The drying and conditioning technologies developed by Fratelli Carlessi start precisely from these considerations and allow the operator to develop a specific treatment to uniform the drying between the various zones, guaranteeing a superior final result.

Leather morphology
The skin is an extremely variable organ and its morphology differs significantly depending on the anatomical region. These differences directly influence the physical properties and quality of the raw material.

In addition to these physical variations, it is crucial to understand the directional property of leather. This influences tensile strength and stretchability. The fibres of which the skin is made do not all uniformly follow the same direction. Instead, they tend to have a radial arrangement, going from a central point to peripheral areas and following preferential directions along the body. These directions usually align with the growth of the animal itself. This fibrous orientation is the reason for the directional resistance patterns that indicate where the skin is more or less extensible.

Directional properties of leather fibres


The CRC dryers from Carlessi for the leather fibres optimisation

Carlessi CRC rotary dryers are designed to respect and enhance these morphological and directional complexities. The tension CRC apply to the leathers is fully adjustable, allowing to achieve the highest possible quality and surface yield. The patented system of diversified expansion units in each cell allows for the precise adjustment of both the extension and relaxation of the hides throughout the drying cycle, ensuring maximum surface yield and the protection of the quality of the semi-finished product.

Carlessi's new-generation CRC toggle dryers work thanks to a special frame that 'listens' the leather. Unlike classic systems that are limited to a static, vertical opening, or those with a vertical/horizontal opening that instead pull incorrectly the leather in areas where it is sensitive such as the flank (traction perpendicular to the fibres), our system avoids tearing and weakening the leather.

Carlessi's CRC dryers adopt a controlled opening system that dynamically adjusts to the directional and morphological properties of the leather itself.

This adaptability eliminates excessive tension in sensitive areas, preventing tearing or weakening the fibres while maintaining its structure compact. Our quality- and precision-oriented approach ensures that each area of the leather is treated with the utmost respect for its natural characteristics. This optimises surface yield, preserves the integrity of the semi-finished product and prevents possible damage like looseness.

Fratelli Carlessi CRC frame dryer for conditioning tanned hides

Carlessi CRC dryers are the best on the market thanks to their ability to adapt to different leather morphologies. They offer precise control of humidity and temperature, which are essential variables for treating different regions of the leather in an optimal manner. As water is unevenly distributed and is also the main regulating agent of the skin's physical characteristics, its removal and equalisation is essential. This process ensures the integrity of the material and improves its processability and the final quality of the leather by adapting the drying cycle to the specific needs of each part of the leather.

Carlessi's Cell Rotary Conditioners optimise the drying process for each type of leather, reducing the risk of damage and improving the yield of the finished part. Carlessi's technology ensures superior quality and optimum product consistency, enhancing the natural properties of the material and the leather fibres optimisation.

Fratelli Carlessi CRC frame dryer for leather processing in tanneries


bottom of page