A tanning agent-free leather making method is provided. A raw hide is subjected to controllable dehydration with a molecular sieve-polar organic solvent composite dehydration media to achieve a dehydrated hide, and then a tanning agent-free leather is prepared by increasing the surface roughness of the dehydrated hide and reducing the surface energy of the dehydrated hide. The present disclosure does not use any metal or non-metal tanning agent, which is eco-friendly. The present disclosure breaks the balance of water distribution between the raw hide and the polar organic solvent, which realizes a multi-medium self-driven directional controllable dehydration of the raw hide, effectively solving the problems during dehydration of the raw hide only using polar organic solvent. The molecular sieve-polar organic solvent dehydration system is easy to recover and can be recycled for the controllable dehydration of the raw hide multiple times. Therefore, a brand-new clean leather making technology is provided.

A tanning agent-free leather making method is provided. A raw hide is subjected to controllable dehydration with a molecular sieve-polar organic solvent composite dehydration media to achieve a dehydrated hide, and then a tanning agent-free leather is prepared by increasing the surface roughness of the dehydrated hide and reducing the surface energy of the dehydrated hide. The present disclosure does not use any metal or non-metal tanning agent, which is eco-friendly. The present disclosure breaks the balance of water distribution between the raw hide and the polar organic solvent, which realizes a multi-medium self-driven directional controllable dehydration of the raw hide, effectively solving the problems during dehydration of the raw hide only using polar organic solvent. The molecular sieve-polar organic solvent dehydration system is easy to recover and can be recycled for the controllable dehydration of the raw hide multiple times. Therefore, a brand-new clean leather making technology is provided.

A system and method for fresh bovine hide splitting includes a hide splitting machine configured to split a fresh bovine hide into a top grain and a collagen sheet. The top grain may be used for leather products. The collagen sheet may be processed with at least one of a maceration process or a drying process to produce a fresh bovine hide raw material product without the addition of a liming or bluing process. The fresh bovine hide raw material product may not include residues remaining following a liming process or bluing process. The fresh bovine hide raw material product may be usable in downstream products for human consumption including gelatin.

A system and method for fresh bovine hide splitting includes a hide splitting machine configured to split a fresh bovine hide into a top grain and a collagen sheet. The top grain may be used for leather products. The collagen sheet may be processed with at least one of a maceration process or a drying process to produce a fresh bovine hide raw material product without the addition of a liming or bluing process. The fresh bovine hide raw material product may not include residues remaining following a liming process or bluing process. The fresh bovine hide raw material product may be usable in downstream products for human consumption including gelatin.

A reconstituted-leather-manufacturing process includes a progressively increasing application of pressure to an aqueous leather solution to form a web of leather fibers. The solution/web may be dewatered to an extent before the first application of a pressure so that the solution/web consistency is on the order 29-55% (fiber to web/solution, by weight) when the first pressure of the progressive sequence of pressures is applied. Tannin (and various chemicals) may be added to the solution. The progressive pressing of the solution/web may be followed by a progressive drying of the web by application of a sequence of increasing temperatures via drying vessels.

A system and method for fresh bovine hide splitting includes a hide splitting machine configured to split a fresh bovine hide into a top grain and a collagen sheet. The top grain may be used for leather products. The collagen sheet may be processed with at least one of a maceration process or a drying process to produce a fresh bovine hide raw material product without the addition of a liming or bluing process. The fresh bovine hide raw material product may not include residues remaining following a liming process or bluing process. The fresh bovine hide raw material product may be usable in downstream products for human consumption including gelatin.

A system and method for fresh bovine hide splitting includes a hide splitting machine configured to split a fresh bovine hide into a top grain and a collagen sheet. The top grain may be used for leather products. The collagen sheet may be processed with at least one of a maceration process or a drying process to produce a fresh bovine hide raw material product without the addition of a liming or bluing process. The fresh bovine hide raw material product may not include residues remaining following a liming process or bluing process. The fresh bovine hide raw material product may be usable in downstream products for human consumption including gelatin.

The present invention refers to the process of obtaining ‘leather bone’ type snacks, commonly used by dog tutors as snacks and as a treat for the animal in dressage processes, comprised of simple stages of execution, one of the stages being chemical and other ones being mechanical, and free of components potentially harmful to the animal's health, such as flavorings, dyes, glue and resins, thus solving a technical problem related to the need to minimize risks to animal health, due to the use of harmful components in the manufacturing process of the product.

A pelt board bag for use in combination with a pelt board for the tanning and drying of a pelt applied externally to the pelt board bag comprises a pair of oppositely positioned and substantially coextensively extending, elongated sheets. The pair of sheets are joined together along opposite longitudinal edges and define in a first state a flat two-layer structure and in a second state a basically tubular state. The pair of sheets define opposite first and second ends. The first end constitutes a narrow open end constituting a top end when used in combination with the pelt board, and the second end constitutes a broader bottom end when used in combination with the pelt board. The pair of sheets define in the second state an inner perimeter varying from the first narrow end to the broader second end. The pair of sheets have a region at a specific inner perimeter, which is provided with slits, oblong apertures, embossings, score lines or folds allowing the region to be expanded at least in one direction longitudinally or transversely when in the second state. Each of the longitudinal edges defines a respective fold line at which the material is folded and the fold lines are provided with slits, oblong apertures, embossings, score lines or folds and extend substantially between the first end and the second end.

A pelt board bag for use in combination with a pelt board for the tanning and drying of a pelt applied externally to the pelt board bag comprises a pair of oppositely positioned and substantially coextensively extending, elongated sheets. The pair of sheets are joined together along opposite longitudinal edges and define in a first state a flat two-layer structure and in a second state a basically tubular state. The pair of sheets define opposite first and second ends. The first end constitutes a narrow open end constituting a top end when used in combination with the pelt board, and the second end constitutes a broader bottom end when used in combination with the pelt board. The pair of sheets define in the second state an inner perimeter varying from the first narrow end to the broader second end. The pair of sheets have a region at a specific inner perimeter, which is provided with slits, oblong apertures, embossings, score lines or folds allowing the region to be expanded at least in one direction longitudinally or transversely when in the second state. Each of the longitudinal edges defines a respective fold line at which the material is folded and the fold lines are provided with slits, oblong apertures, embossings, score lines or folds and extend substantially between the first end and the second end.