CS211919B1 - Method of preparation of the collagenous raw material for production of the gelatine particularly photographic - Google Patents

Description

The invention provides a process for the preparation of collagen. raw materials. of poultry feet for gelatine production, in particular photog. ·

Gelatin is from the feet. has not yet produced poultry. The raw material used for the production of gelatin, also suitable for photographic purposes, is leather and the highest quality bone material. The technological process of preparing collagen raw material for the production of this gelatin is relatively tedious and laborious and unsuitable for the preparation of collagen raw material from poultry feet. The prepared bones and skin are usually calcined with calcium hydroxide solution for 5 to 14 weeks during manufacture. A separate technological operation for the preparation of collagen raw material, in particular of bones, is the relatively complex process of extracting fat by means of solvent or water vapor, with the usual extraction methods adversely affecting the quality of the collagen. The defatted bones should be cleaned by plastering the remains of meat, dust, hair, etc.. dirt and fine bone fragments. During the preparation of the collagenous raw material for gelatin extraction, the raw material must be washed with a lot of water in order to leach unwanted contents. The preparation of the collagen feedstock is therefore characterized by a high consumption of water, calcium hydroxide or other chemical agents and a large proportion of calcium or other undesirable waste water. Waste water disposal requires a large amount of neutralization chemicals. For continuous production is needed - usually up to three months supply of processed material and corresponding. large storage and handling areas and equipment.

The above drawbacks are substantially eliminated by the process for preparing collagen feedstock from poultry feet according to the invention. Its essence is that the feet are crushed, washed with clean water to get rid of blood and other washable components, then macerates in an acidic environment, and washed with clear-water to get rid of maceration. agents. After maceration

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211 919 is lime, preferably 1 to 3% calcium hydroxide solution for 5 to 15 days, then washed with clean water and acidified, preferably with dilute hydrochloric acid to 3.0 to

4.0 pH of the feedstock and finally the feedstock is freed of residual salts and acids by washing with clean water up to 4.5-6.0 pH of feedstock.

The process for preparing collagenous feedstock from poultry rich according to the invention is considerably faster and less labor intensive than the methods used in the prior art feedstocks.

The feet may be crushed continuously in a shredder located directly at the point of their hanging from the yoke of the suspension conveyor of the carcass line for the first processing of poultry. Crushed feet can be automatically, eg. by hydraulic or pneumatic equipment, • transported to the next processing site. Some technological operations are excluded from the production process compared to the prior art, for example the relatively complicated and expensive fat extraction, plastering and the number of washings required. The liming time is considerably shortened. Consumption of technological water will be reduced by 10 to 40% by limiting the number of technological operations and the necessary washing. Relatively smaller amounts of chemical agents are required to process the feedstock. The volume of wastewater and the treatment and purification costs will be reduced. · Specific energy consumption for raw material preparation and processing itself will be reduced. Substantial requirements will be reduced on space and equipment for storing, handling of raw materials and processing. The use of poultry feet, prepared on-site, enables the reduction of losses in the storage and transport of the raw material, the increase in the degree and mechanization and the automation of production. and much of the manufacturing process can be continualized. It will allow the highly efficient utilization of poultry feet, waste material from large-scale poultry slaughtering lines that have hitherto been used for the production of flax meal or fed.

The collagen feedstock prepared by the process of the invention can also be used for the production of sizing.

Examples of use of the method of adding collagen raw material from poultry feet according to the invention:

Example 1

The feet are continuously crushed in a shredder placed under the suspension conveyor of the poultry processing line at the point of hanging them from the stirrups of the suspension conveyor. The crushed feet are automatically transported by pneumatic conveyor * into the storage tank. The crushed feet are washed 5 times with pure water in a 1: 3 weight ratio of feet and water to remove blood and other washable undesirable admixtures. After washing, they are macerated in an acidic environment, preferably * e.g. 2 to 4% dilute hydrochloric acid over a period of about 6 to 10 hours, at a ratio of the treads to the macerating agent of 1: 2, until complete demineralization of the bones. The macerating agent is drained and its residues removed. they are washed out of the raw material by washing with pure water in a ratio of 1: 3 of the feet and water, a total of 3 to 4 times, or continuously to 3.0 to 4.0 pH of the raw material. Then, the lime raw material is a 1 to 3% calcium hydroxide solution in the ratio of footprints to a 1: 2 solution for 5 to 15 days until complete swelling. The solution is changed 2 to 4 times during the liming period. After liming, the raw material is washed with pure water, 1: 3 for a total of 3 to 4 times, adding hydrochloric acid to a solution concentration of 0.5 to the last wash. up to 1.0%, which also acidifies the feedstock to 3.0 to 4.0 pH. Finally, the raw material is washed with pure water 2 to 4 times in the ratio of foot and water 1: 3 up to 4.5 to 6.0 pH of the raw material.

Example · 2 ’.

The procedure is as in Example 1 except that the raw material is preserved before maceration with a preservative, e.g. 1% calcium hydroxide solution or 2 to 3% sulfuric acid or 2 to 3% acetic acid and the like. The canned raw material is stored or transported to the site of further processing, e.g. manufacturing gelatine. Washing with clean water removes the preservative from the raw material. Proceed as in Example 1.

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Example 3

The procedure is as in Example 1, except that after the maceration reagent has been pumped, the raw material is stored in the macerated state or transported to the site of further processing, e.g. gelatine · The procedure is as in Example 1 ·

Claims (1)

OBJECT OF THE INVENTION Process for preparing collagenous raw material from poultry feet for the production of gelatin, in particular photographic, characterized in that the feet are crushed, washed with clean water to remove blood and other washable components, then macerated in an acidic environment, preferably in a 2-4% solution hydrochloric acid, washing with clear water to remove the macerating agent, preferably to 3.0 to 4.0 pH of the raw material, then liming, preferably Г to 3% calcium hydroxide solution for 5 to 15 days, washing after liming with clear water and acidify, preferably with dilute hydrochloric acid to 3.0 to 4.0 pH of the feedstock, and finally, the feedstock is freed of salt and acid residues by washing with pure water up to 4.5 to 6.0 pH of the feedstock.