The way bating fish skin

 

The method relates to the processing of the skins of fish and can be used in the leather industry. The way bating fish skins is performed in two stages including a first stage of abating before liming using pectolytic preparations and cellulolyticus actions at doses of 0.2% of the mass of skins for each drug in the total volume ratio of 1.0, the temperature 291oIn drum mode, the rotation-stop 5 and 15 min for 40-60 min; at the second stage after ashing before pickling-tanning reuse of pectolytic preparations and cellulolyticus actions at doses of 0.2% by weight of the hide, and adding an alkaline protease at a dose of 0.4% by weight of the hide with a total volume ratio of 1.0 in the mode rotation-stop 5 and 15 min for 60 to 90 minutes Technical result is to improve the strength characteristics and the temperature of the welding finished leather. 1 C.p. f-crystals, 2 tab.

The invention relates to the leather industry, in particular the production of fish skin high quality haberdashery, shoes, clothing trimmings, furniture, hats.

One of the most important this is its strength characteristics, is a method of abating.

There is a method of abating the skins of fish, which is carried out after soaking-degreasing by means of a single processing the skins in a solution of proteolytic enzyme it GSH when the pancreas (EN 2111257, CL 14 With 13/00, 20.05.98).

The closest analogue to the technical essence is a method of manufacturing fish skin, which after degreasing and soaking the skins magchat solution of proteolytic enzyme preparation steps, the temperature of 30-45oWith the amount of solution 1.5 to 8.0 times the loaded weight of the skins, the processing time 3-40 minutes At the end of processing the hides are placed in cold water containing a disinfectant substance in quantities of 0.5 to 15% by weight of the hides, and tan in a solution of chromic salts (EN 2026883, WITH 14 13/00, 1995).

The disadvantage of this method is incomplete exemption from mucus secreting cells contained in large quantities in a multilayered epidermis skins of fish such as catfish and insufficient removal of interfibrillar substance of the dermis (especially in the skin of carp), the main component of which mucopolysaccharides. Mucopolysaccharides 45-50% consist of hexosamines, to destroy which is possible only under the influence of specific firmenlogo quality.

The technical result of the invention is to improve the strength characteristics of leather, namely, tensile strength tensile elongation tensile (skin elasticity), the temperature of the welding finished leather due to more effective produbljivanja, complete liberation front layer and dermis from the contents of glandular cells and mevalonate substances, strengthen the connection of the front layer of the dermis.

The technical result is achieved in that way abating, fish skins carried out in two stages including a first stage of abating before liming using pectolytic preparations and cellulolyticus actions at doses of 0.2 % of the mass of skins for each drug in the total volume ratio of 1.0, the temperature of 28-30oWith the drum in the "rotation stop" respectively 5 and 15 min for 40-60 min, in the second stage, including after ashing before pickling-tanning reuse of pectolytic preparations and cellulolyticus actions at doses of 0.2% by weight of the hide, and adding an alkaline protease at a dose of 0.4% by weight of the hide with a total volume ratio of 1.0 in the "rotation stop" respectively 5 and 15 min for 60 to 90 minutes After the first and second ateistiy drum for 15 minutes

The inventive method is illustrated by the following example.

Example 1. The skin of a catfish, the epidermis which presents a multilayered reservoir, containing a large number of glandular cells - goblet and mucous, after degreasing and pre-pickling sent to the abating.

The abating spend intermittently rotating the drum in a softening bath: water from the well. K.=1.0 and the complex enzyme preparations, % by weight of raw hides: Cellularity GH - 0.2 Pectofoetidin G3x - 0,2 Measured amount of enzymes dissolved in a small amount of water temperature (291)oWith up to complete dissolution.

In the drum with skins pour heated water during rotation of making a solution of enzyme preparations.

During the whole process of bating hides the temperature of the solution is maintained at a level (291)oC.

Processing time depends on the size groups skins: the skins I-II group processing time is 40 min, for III - 60 minutes

The treatment is carried out in the "rotation-stop", which is respectively 5 and 15 minutes

In process control the temperature of the solution and the activity of enzyme preparations before using.

OK what to see during the rotation of the drum for 15 minutes The washing water is drained.

Subsequent ashing and obessolivanija skins carried out by known methods. After obessolivanija perform the second stage of abating.

The processing of the hide spend intermittently rotating the drum in macilroy bath: water from the well.to.=1.0 and the complex enzyme preparations, % by weight of the hide: It GSH - 0.4 Cellularity GH - 0.2 Pectofoetidin GSH - 0.2 Cooking macilroy baths: enzyme complex is dissolved in a small amount of water temperature (291)oC until complete dissolution. In the drum with Golem pour heated water during rotation to make the solution of enzyme preparations.

Processing time depends on the size groups skins: the skins I-II group processing time is 60 minutes, for III - 90 minutes

The processing performed in the mode of the rotation-stop", which is respectively 5 and 15 minutes

During the whole process of bating pickling temperature of the solution must be maintained at level 291)oC.

In the process of treatment is to control the temperature of the solution, pH, activity of enzyme preparations before use, the degree of protagonisti of the hide.

Likewise, the abating of other types of skins: the drugs are given in table.1.

The way bating fish skins enzyme preparations are given in table.1 modes is carried out analogously to example 1.

After processing enzyme preparations at optimum values of the parameters listed in table.1, the skins after the first stage of abating, are exempt from the surface mucus and most are prepared to liming, during which actively swell, and give a good "plumping", are exempt from the contents of glandular cells and interfibrillar substance.

In the second stage of abating, with the introduction of additional protease is a longitudinal splitting of the structural elements of the dermis, promote the production of skin with isotropic deformation properties and two mutually perpendicular directions, and comes complete liberation front layer and dermis from the contents of glandular cells and interfibrillar substance, relates the obverse layer with dermis.

The choice of alkaline protease due to its direct action and versatility in the selected pH and temperature protease retains at least 80% of its activity.

Changes in the composition megjelenik baths (beyond the parameters and modes bating in the direction of decreasing or increasing (beyond the parameters) is of the front layer and maceration of the dermis, dramatically reducing the quality of fish skins.

In the bating on the proposed method are durable, soft, elastic fish skin with high temperature welding.

In table.2 shows some physical and mechanical properties of fish skin.

Thus, the proposed 2-stage method bating fish skins using proteolytic enzyme preparations, cellulolyticus and pectolytic action allows to prepare the skins for ashing processes and perelivania-tanning and manufacture of semi-finished leather of high quality.

Using the proposed method bating fish skins provides the following benefits:

1. After the first stage of abating, fish skins are exempt from mucus and epidermal maximally prepared to liming.

2. The liming is accompanied by swelling, removing interfibrillar substance.

3. The introduction of alkaline protease in complex enzyme preparations in the second stage leads to longitudinal splitting of the structural elements of the dermis, full liberation front layer and dermis from the glandular cells, which contributes to the production of semi-finished leather of high quality with excellent prscar, performed in two stages including a first stage of abating before liming using pectolytic preparations and cellulolyticus actions at doses of 0.2% of the mass of skins for each drug in the total volume ratio of 1.0, the temperature of 28-30oIn drum mode, the rotation-stop 5 and 15 min for 40-60 minutes, the second stage - after ashing before pickling-tanning reuse of pectolytic preparations and cellulolyticus actions at doses of 0.2% by weight of the hide, and adding an alkaline protease at a dose of 0.4% by weight of the hide with a total volume ratio of 1.0 in the mode rotation-stop 5 and 15 min for 60-90 minutes

2. The method according to p. 1, in which, after the first and second stages of a softening bath is drained, skins pour water from a well.to. = 1.5 temperature from 15 to 20oC and washed with rotation of the drum for 15 minutes

 

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FIELD: fur industry, in particular, method for evaluating pickling quality of leather web in tanning of fur and sheepskin raw material.

SUBSTANCE: method involves providing testing on parallel groups of fur sheepskin after pickling on three topographic portions of sheep skin surface: skirt, spine and neck portions; processing samples of each group with acid-salt solution for 24 hours; withdrawing sheepskins of each group from acid-salt solution in predetermined time intervals; removing excessive liquid; placing said samples into tensile testing machine and stretching lengthwise of spine line by 40% relative to initial length thereof; holding samples in stretched state for 1 min and withdrawing from tensile-testing machine; leaving samples in free state for 10 min; determining residual elongation value in mm.

EFFECT: reduced time for determining quantitative pickling characteristic of skin web.

2 tbl, 2 ex

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