6 results about "Tanning tanning" patented technology

The present application belongs to the field of leather industry production, and particularly relates to a method for high absorption chrome tanning by using cross-linking enzyme preparation. The method comprises the following steps: water immersion, unhairing and liming, deliming, softening, enzyme-assisted tanning, and acid immersion tanning. The enzyme-assisted tanning is assisted by using cross-linking enzyme preparation. The cross-linking enzyme preparation is not used in combination with the hydrolytic enzyme in the softening step. The cross-linking enzyme comprises glutamine transaminase (TG enzyme). The comprehensive activity of the cross-linking enzyme is controlled to be 1-30 U / ml in the application process, and the activity of the TG enzyme is controlled to be 1-20 U / ml. The process in the present application meets the environmental protection requirements. Firstly, the tanning agent absorption rate in the tanning process is successfully improved, and the waste discharge amount in the tanning process is reduced. Secondly, the cleaner cross-linking enzyme preparation is successfully used to replace the chemical auxiliary agent to improve the tanning agent absorption rate. Thirdly, the process operation is simplified.

The present invention relates to a method for antimicrobial protection applied to hides in the tanning process incorporating a biocidal composition and an additive allowing the Identification of its presence by means of a luminescent effect, as well as certifying its originality using luminescence encryption techniques, wherein the composition is added in the tanning process immediately after adding the chromium or titanium salts and in an amount between 0.1 % and 5 % by weight of the material to be tanned and comprises: silver phosphate glass between 3 % and 5 %; silicone in an amount between 1 % and 3.5 %; aliphatic hydrocarbons between 0.1 % and 0.30 %; and water between 90 % and 95 %, and the luminescent additive is added in an amount between 0.1 % and 5 % by weight of the material to be tanned and comprises between 20 % and 40 % silica; alumina in a proportion between 10 % and 30 %; calcium fluoride between 30 % and 50 %; erbium (III) fluoride between 0.5 % and 3 %; ytterbium (III) fluoride between 5 % and 15 %; thulium (III) fluoride in a maximum amount of 5 %; and europium (III) fluoride in a maximum amount of 5 %, with respect to the total weight of the luminescent additive.

This invention relates to the field of leather processing technology and discloses a tanning process for all-vegetable tanned cowhide floor leather, comprising the following steps: pre-treating raw hides followed by acid immersion pre-tanning, tanning, intermediate treatment, retanning, and post-treatment to obtain finished leather; a first pre-tanning agent is added during the acid immersion pre-tanning process; the tanning process includes the following steps: adding water and the first tanning agent to a groove and rotating; adding a second tanning agent and rotating; adding a third tanning agent and rotating; adding a fourth tanning agent and rotating; adding a fifth tanning agent and rotating; then transferring to a drum, adding water and a sixth tanning agent and rotating; adding a seventh tanning agent and rotating; the retanning process includes the addition of a first retanning agent and a second retanning agent. This invention uses a combination of groove immersion and drum tanning, which greatly shortens the tanning time, reduces the floor space required, and saves labor costs.

The application provides an organic silicon s-triazine derivative and a preparation method and application thereof, and belongs to the technical field of leather tanning agent development. The organic silicon s-triazine derivative is prepared from a s-triazine compound and organic silicon, and overcomes the problem of insufficient performance of the leather tanning agent in the prior art. The organic silicon s-triazine derivative can be crosslinked with skin collagen at multiple active sites, and good tanning effect is achieved. In the tanning process using the organic silicon s-triazine derivative, no harmful substances such as formaldehyde and heavy metal salts are involved, and environmental pollution is avoided. The product has strong tanning permeability, the tanned leather has a smooth and fine grain surface and excellent fullness, and is easy to be subjected to subsequent processing steps such as dyeing; and an environmentally-friendly and clean tanning method is provided for the leather-making industry.

This utility model discloses a tanning device for preventing leather entanglement, relating to the field of leather production. It addresses the problems of existing tanning devices that use clamping grooves to fix the edges of leather to prevent entanglement, but this method is inefficient due to individual clamping. Furthermore, after tanning, the drum needs to be lifted and removed by a lifting device before the leather can be taken out, affecting tanning efficiency. The tanning drum has partition plates fixedly connected to both sides of its inner center. Multiple anti-entanglement columns are arrayed on the inner wall of the drum. A material loading / unloading opening is located at the center of the front face of the drum, and an arc-shaped sealing plate is rotatably connected to the outside of the opening. A receiving pool is fixedly connected to the upper surface of the support platform between two support frames. By setting the partition plates, the internal space of the tanning drum is divided into multiple independent chambers, effectively reducing the amount of leather accumulation. Combined with the physical barrier effect of the anti-entanglement columns, the probability of leather entanglement during the tanning process is significantly reduced.

A tanning process with recovery of water and chemical products comprising at least the steps of: - introducing one or more hides in a containment chamber thermally insulated from the outside, in which temperature, humidity and quantity of liquid inside are constantly monitored; - treating the hides, by feeding to containment chamber a treatment liquid in nebulized form selected from the group comprising water or a mixture thereof with one or more chemical products adapted to give to said hides the desired mechanical, physical and aesthetic properties; - extracting the hides from the containment chamber; characterized in that, subsequently to the step of treating the hides, said process comprises a rinsing procedure comprising at least the steps of: - discharging the treatment liquid not absorbed by the hides from the containment chamber; - accumulating the treatment liquid not absorbed by the hides in a collection tank; - rinsing the containment chamber by feeding a rinsing liquid selected from the group consisting of water or a mixture thereof with one or more detergent products; - discharging the contaminated rinsing liquid after use from the containment chamber; - accumulating the contaminated rinsing liquid after use in the collection tank; - treating the accumulated rinsing liquid in the collection tank in order to separate the water from the chemical products; - recovering the water and the chemicals products generated by the step of treating the liquid accumulated in the collection tank, in order that they can be at least partially reused in the same tanning process or in a subsequent tanning process.