摘要:
The invention relates to a rawhide dehairing process comprising contacting a rawhide with a solution including a lipase and/or a protease for a predetermined amount of time, wherein the pH of the solution is substantially neutral, and removing hair from the rawhide. The invention also relates to cultures comprising enzyme-secreting Pseudomonas aeruginosa strains A/C2 and B/GZN.
摘要:
An enzymatic unhairing agent for use in an unhairing step in the tanning for producing a leather which comprises alkaline protease as an active ingredient; a treatment solution comprising the enzymatic unhairing agent and a pH adjusting agent; a method for enzymatic unhairing treatment in the tanning for producing a leather which comprises contacting a law hide with the treatment solution; and a leather produced by the method. The method can be employed for providing a leather and recovered hairs both of good quality, while markedly reducing the pollution load of an unhairing waste water from the unhairing step.
摘要:
The invention provides an enzymatic unhairing agent for use in an unhairing step in tanning for producing leather comprising an alkaline protease as an active component; a treatment solution comprising a pH-adjusting agent and the enzymatic unhairing agent; a method for enzymatic unhairing treatment in tanning for producing leather comprising contacting the treatment solution with a raw hide or skin; and a leather thus produced. According to the invention, it is attained markedly reduction of the pollution load in the unhairing waste water and leather and recovered hairs both of good quality can be obtained.
摘要:
The present invention relates to a novel process for total lime and sulfide free unhairing in skins/hides using animal and/or herbal (plant) enzymes said process comprising presoaking skin or hide in water, pasting enzyme solution on the flesh or grain side of the skins/hides and removing the soaking liquor, transferring the hides/skins to a bath of water containing of enzyme for unhairing with or without intermittent shaking maintaining the pH of the bath liquor at 4.5 - 10.0 and the skins/hides are left in this bath for 12 -24 h at ambient temperature and then unhaired for further processing; the total elimination of lime and sulfide in the unhairing process leads to reduced TDS (total dissolved solids), BOD (biological oxygen demand) and COD (chemical oxygen demand) in the effluent without affecting the collagen of the skin/hide or the grain pattern.
摘要:
The invention relates to a method for producing leather, comprising at least two of the following method steps A) to D): A) using one or more polyelectrolytes during the production of semifinished or intermediate products, involving the addition of one or more polyelectrolytes in at least one of steps (a) to (d): (a) together with 0 to 1.5 % by weight of lime, with regard to the weight of salt, immediately before or in the lime pit; (b) before or during deliming; (c) before or during bating; (d) together with, in total, 0 to 3 % by weight of alkaline salt or alkaline earth salt, with regard to the pelt weight, immediately before or in the pickle solution; B) in the lime pit, treating the skins in an aqueous liquor with one or more compounds of general formula (B.1) or with their corresponding alkali metal salts, alkaline earth metal salts, ammonium salts or phosphonium salts, whereby variables R10 and X1 to X4 have the meanings as cited in the description, with the provision that at least two mercapto groups are contained in the compound or compounds B.1; C) using degreasing agents of general formula (C.1) for degreasing pelts, skins or other intermediate stages and semifinished products during the production of leather, whereby variables n and R16 to R21 have the meanings as cited in the description; D) tanning by using a tanning agent that can be produced by reacting at least one aldehyde of general formula (D.1) with at least one other identical or different aldehyde of formula (D.1) in the presence of an acid catalyst and, optionally, in the presence of at least one additional carbonyl compound of formula (D.2), whereby variables Z and R22 to R25 have the meanings as cited in the description, with the provision that, in the event Z corresponds to a chemical single bond or to a radical without α-hydrogen atoms, at least one additional aldehyde of formula (D.1), in which radical Z contains α-hydrogen atoms, or at least one additional carbonyl compound of formula (D.2) is present. The invention also relates to leather that is produced according to the inventive method.
摘要:
An enzymatic unhairing agent for use in an unhairing step in the tanning for producing a leather which comprises alkaline protease as an active ingredient; a treatment solution comprising the enzymatic unhairing agent and a pH adjusting agent; a method for enzymatic unhairing treatment in the tanning for producing a leather which comprises contacting a law hide with the treatment solution; and a leather produced by the method. The method can be employed for providing a leather and recovered hairs both of good quality, while markedly reducing the pollution load of an unhairing waste water from the unhairing step.
摘要:
La présente invention concerne un procédé de préparation d'un cuir à partir d'une peau brute, le procédé étant exempt de chrome, de permanganate et de sulfure. Ce procédé comprend les étapes suivantes : - obtention d'une peau brute ; - trempe de la peau brute ; - épilage-pelanage de la peau trempée, par traitement enzymatique en l'absence de sulfure ; - écharnage de la peau résultant de l'épilage-pelanage ; - picklage de la peau ; - obtention d'un cuir par tannage de la peau issue du picklage en l'absence de chrome ; la peau étant une peau d'un animal choisi dans le groupe comprenant les crocodiliens, les serpents et les lézards. La présente invention concerne également le crust de cuir susceptible d'être obtenu selon ce procédé ainsi que son utilisation dans le domaine de la maroquinerie ou de l'horlogerie.
摘要:
The present invention relates to a method for the processing of hides or skins into leather, comprising enzymatic treatment of the hide or skin with carbohydrase in the soaking step. The present invention can achieve optimal fiber opening results in a relatively short period of time and at the same time does not cause loose grain, and meanwhile the pollution or impact on the environment is reduced in a maximum way.