The method of processing poultry skins

 

(57) Abstract:

The method relates to the production of leather from the skins of birds, such as chickens, geese, ducks, turkeys, ostrich and others, and can be used in the leather industry. The method includes: soaking off in the presence of organic acids in amounts of from 1.5 to 3.0% by weight of the raw materials, meskene, liming solution of calcium hydroxide and sodium hydroxide in a quantity of 0.8 to 1.5% by weight of raw materials. Then carry out obessolivanie, abating, degreasing, pickling and tanning at the expense of chrome tanning agent 6-10% by weight of raw materials. The method allows to reduce the duration of the process 3 times and get stretchy, durable, genuine leather from skins of birds. table 1.

The invention relates to the leather industry and can be used in the production of leather from the skins of poultry: chickens, geese, ducks, turkeys, ostrich, etc.

A method of processing of the skins of birds, providing: soaking off, liming solution of calcium hydroxide and sodium, obessolivanie, abating, degreasing, salavane and tanning mixture of vegetable and synthetic tanning agent [Patent RAF, 47785, Petrescu Pavel, CL 3-6 280 14 from 07.04.67].

The disadvantage of this method is the usage to the resulting skin is characterized by thick, stiffness and low temperature resistance.

The closest analogue of the proposed technical solution is the method of processing of skins of birds, including: soaking off, meskene, liming, degreasing, obessolivanie, abating, pickling and tanning in two stages [RU, patent 2110580 C1, 14 With 13/00, 10.05.98].

The disadvantage of this method is the complexity of its implementation associated with conducting multiple operations: meskene, degreasing, edit-otenki, two-stage processes of pickling and tanning. Furthermore, the obtained skin have low strength properties.

The technical result of the invention is to improve the quality of the skin and reduction in the duration of processing.

This result is achieved in that in the method of processing of skins of birds, including: soaking off, meskene, degreasing, liming solution of calcium hydroxide, obessolivanie, abating, pickling and tanning,: soaking off is carried out in the presence of organic acids in amounts of from 1.5 to 3.0% by weight of the raw materials, liming is carried out in the presence of sodium hydroxide in a quantity of 0.8 to 1.5% by weight of the raw material, degreasing is carried out after bating, and the tanning is carried out at the expense of chrome tanning agent 6-10% of the MIA structure of the leather, and the subsequent liming in the presence of sodium hydroxide allows to the extent necessary to prepare the skins for holding pregabalina-tanning processes. Sequential acid-base treatment gives the possibility to exclude the application in liming of sodium sulfide.

During sorption the dermis of the skin of organic acids is the weakening of the intermolecular interaction of the elements of the structure of collagen, which leads to an increase of the specific surface and porosity of the semi-finished and finished leather is manifested in the increase of strength properties. Acid-alkaline processing the main part of the fat is removed at this stage of the technological process, therefore, degreasing after bating allows you to extract from the prepared patterns the maximum amount of fat substances at a higher temperature without damaging the skin and prepare it for the subsequent process of tanning with chromium compounds.

The conduct of soaking at a flow rate of the organic acid is less than 1.5% by weight of the skins, ashing at a flow rate of sodium hydroxide less than 0.8% and tanning at the expense of chrome tanning agent is less than 6% not possible to get the skin of raw poultry with high strength properties.

Introduction is it 10% leads to an increase in the rigidity and fragility of the finished leather.

The method is as follows.

Skins taken from birds, after washing are: soaking off when W.to. 2,0, a temperature of 28-30oIn the presence of 1,5-3,0% organic acids during 6-7 hours. After meskene spend liming with calcium hydroxide in the amount of 3-4% by weight of raw materials for 8-10 hours. After washing spend obessolivanie and abating at W. K. 2,0, a temperature of 38-40oWith the consumption of ammonium sulfate 3-4%, enzyme of 0.4-0.5%. After an hour in the dryer injected 1-2% surfactant and 4-5% kerosene and degreasing is carried out in 2 hours. After washing spend pickling at W.to. 1,0, a temperature of 20oWith the presence of 5-6% sodium chloride, 10 minutes later, the drum is administered 3-4% formic acid and 0.8-1.0% sulfuric acid and the treatment continued for 3-4 hours, and then in one stage give powdered chromium tanning agent at a flow rate of 6-10% by weight of the skins. The temperature of the welding chrome-plated semi 95-102oC.

Dyeing and greasing and finishing processes are carried out according to the method of production of leather, from lambskin.

Example 1. Skins taken from the carcasses of chickens, are: soaking off in the presence of 1.5% formic acid for 6 hours. After meskene spend liming in the presence of 0.8% of caustic soda is ia in the amount of 4% and the enzyme preparation of protocolin G-3 x 0.5% by weight of the skins. After 1 hour, the drum is injected at 2.0% surfactant (sinterol AFM) and 5% kerosene and degreasing is carried out in 2 hours. After washing spend pickling in the presence of 6% sodium chloride, 10 minutes later, the drum impose 4% formic acid and 1% sulfuric acid and the treatment continued for 3 hours, then at one stage give powdered chromium tanning agent at the rate of 6% by weight of the skins. The temperature of the welding chrome-plated semi-finished product is 95-102oC.

After aging carry out dyeing and greasing and finishing processes according to the method of production of leather, from lambskin.

Example 2. Skins taken from carcasses ostrich, treated as in example 1, but: soaking off is carried out in the presence of phthalic acid in the amount of 2.25% by weight of the skins, liming is carried out in the presence of 1.15% sodium hydroxide, and the tanning is carried out at the expense of chrome tanning agent 8% by weight of the skins.

Example 3. Skins taken from carcasses of turkeys, treated as in example 1, but: soaking off is carried out in the presence of acetic acid in the amount of 3.0% by weight of the skins, liming is carried out in the presence of 1.5% sodium hydroxide, and the tanning is carried out at the expense of chrome tanning agent to 10.0% by weight of the skins.

Example 4. Skins taken from the carcasses of chickens, process, as W ill result in the presence of 0.6% sodium hydroxide, and tanning is carried out at the expense of chrome tanning agent to 5.5% by weight of the skins.

Example 5. Skins taken from the carcasses of geese, treated as in example 1, but: soaking off is carried out in the presence of phthalic acid number of 3.2% by weight of the skins, liming is carried out in the presence of 1.7% sodium hydroxide, and tanning at the expense of chrome tanning agent to 10.5% by weight of the skins.

Qualitative indicators of finished leather from skins of birds in comparison with the skin of the prototype presented in the table.

Using the proposed method allows to reduce the duration of the process 3 times and get flexible, strong, original leather from the skins of birds, suitable for the manufacture of fine and elegant products leather and decorative parts for leather goods and footwear.

The method of processing of skins of birds, including: soaking off, meskene, degreasing, liming solution of calcium hydroxide, obessolivanie, abating, pickling and tanning, characterized in that: soaking off is carried out in the presence of organic acids in amounts of from 1.5 to 3.0% by weight of the raw materials, liming is carried out in the presence of sodium hydroxide in a quantity of 0.8 to 1.5% by weight of the raw material, degreasing is carried out after bating, and the tanning is carried out at races

 

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