PL100656B1 - METHOD OF DEPILING SWINE SKINS - Google Patents

Description

The invention relates to a method of depilating pig skins, allowing you to receive high quality leather and bristles.

Until now, enzymes have been used to remove skins we have optimal microbial origin operating in an inert or alkaline environment and pancreatic enzymes which are used internally pH = - 7.8-3.5.

Under these conditions, pancreatic enzymes possess optimal proteolytic activity against the state standard protein substrates and the largest metabolic reactivity in physiological processes all. The epilating activity, however, is in these low conditions. Pancreatic enzymes with no great depilatory properties have a lot structural destruction of pig skin and therefore have not yet been applied for the depilation of skins. For raises Therefore, it is recommended to use them so that they are effective not pancreatic enzymes in a mixture with enzymes microbial origin.

Another way to catalyze the depilatory process leather is the action of the leather fabric some chemicals, such as salts ammonium, oxygen sulfur compounds, sugars are reduced ce, chlorides or radicals which are used together with enzymes or in the pre-treatment bath enzymes.

These compounds are often used in alkaline baths numerous containing alkalizing substances or alkaline expanding skin tissue. For alkaU- sodium carbonate, borax or buffers are used, which increase the pH of the skin tissue to the maximum to 10.0, and for alkaline flushing is used most often hydrated lime, hydroxide sodium or ammonia water to increase the pH leather up to a value of 12-13.

The above known methods are mainly used for depilation of cowhides. Not suitable for de¬ pilation of pig skins, because pig skins require special technological solutions, for high quality, no only skins, but also bristles.

Enzymes, including mainly pancreatic enzymes, de- while sawing pig skins, not alkalized, as well as not alkalized to pH - 10.0, affect de¬ structurally on morphological tissue components skin, resulting in a low skin low quality. However, a strongly alkaline environment pH = 12-13, containing foaming substances skin tissue, makes it resistant to destructive effects the discharge of depilatory enzymes, however, has a negative effect important for the hair keratin.

The method of epilating pig skins according to the invention is as follows: pigskins, intended for combined for depilation with proteolytic enzymes combined pancreatic or microbial walking, after degreasing, subjected to initial alkalization in bath with a pH value in the range 10-12. In composition process catalysts are included in the alkalizing bath 100 656 100 656 3 depilatories such as ammonium chloride and molasses and alkalizing substances, the basis of which the desired ingredient is sodium carbonate. For elevation The use of environmental pH up to 10-12 is used no more than 0.5% calcium hydroxide as well sodium hydroxide up to 0.5%. Percentages the ingredients of the bath are calculated in relation to the weight green leather. Then the skin rinses and enters lotion in the depilatory bath with the addition of an enzyme, for a period of 4 to 6 hours, the depilution process leather lining in the presence of the enzyme of origin pancreas is carried out in a water bath with a value of pH values in the range 8.5-10.5. * The method of epilating pig skins according to the invention provides both skins and and high-quality bristles.

The method according to the invention is explained in more detail in the execution examples.

Example I. Pig skins soggy and soggy fat is subjected to the action of an alkaline bath pH = 11, containing 50% of water at a temperature of 38 ° C., 2% sodium carbonate, 0.5% water calcium oxide, 0.2% sodium hydroxide, 0.5% ammonium chloride and 0.51% molasses. After 3 hours daytime turning of skins in a slow-rotating drum no, the bath is diluted with 250% water at a temperature of rush 38 ° C and after 10 minutes the bath is poured out.

The skins are then depressed in the bath with an initial pH = 10.0. Depilatory bath fails ra 30% water at 38 ° C, 0.3% carbonate sodium, 0.1% sodium hydroxide and 3% pancreatic preparation with proteolytic activity against casein 40 enzyme units / g of the preparation. After 5 hours, epilate the process it is finished. The ingredients of the bath are calculated in relation to the weight of green hides.

Example II. Swine skins soggy and the degreased solution is alkalized in a bath at pH-11.

Composition of the bath as in example 1. After 3 hours turning the skins in a slow-rotating drum, bath it is poured and the skin is rinsed for 10 minutes at 200% water at 38 ° C with the addition of 0.5% ammonium chloride. So prepared undercoats subject to the depilation process in the bath, including with 30% water at 38 ° C and 0.3% enzymes to him of proteolytic microbial origin ^ it is called E-72 (Bulgarian preparation). After hours the epilating process is complete.

Claims (1)

1. Patent claim A method of depilating pig skins, carried out with the use of enzymes, consisting in pre-alkalization in a bath at a temperature of about 38 ° C, containing sodium carbonate, calcium hydroxide, sodium hydroxide, ammonium chloride and molasses, characterized by that of pig skins intended for depilation with proteolytic enzymes of pancreatic or microbial origin, after degreasing, they are subjected to initial alkalisation in a bath with a pH value in the range of 10-12, with a calcium hydroxide content in the alkalizing bath not greater than 0 , 5% and sodium hydroxide to 0.5% in relation to the weight of green leathers, then the skin is rinsed, and then put into a depilatory bath with the addition of an enzyme for a period of 4-6 hours, the process of depilating the skin using of the enzyme of pancreatic origin is carried out in a water bath with a pH in the range 8.5-10.5. OZGraf. Lz. 2163 (105 + 17) Price 45.