Methods for disinfecting raw wool suspected of being contaminated with bacteria
Patent Information
- Authority / Receiving Office
- DE · DE
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 1929-08-28
- Publication Date
- 1932-01-04
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
Existing methods for disinfecting raw wool contaminated with bacilli spores either mix and felt the wool, making it unsuitable for sorting, or fail to provide adequate disinfection without altering its natural state.
A dry pre-cleaning process using organic solvents to loosen and expose bacilli spores, followed by treatment with gaseous disinfectants, ensuring the wool retains its natural form and can be sorted post-disinfection.
The method ensures complete disinfection of wool while maintaining its natural structure, allowing for effective sorting and subsequent washing.
Description
[0001] Method for disinfecting raw wool suspected of being contaminated with bacteria. So far, all efforts to develop a usable disinfection method have been unsuccessful. Finding a solution for wool containing bacillus spores that does not result in a decrease in value has failed because these wools become contaminated in sweat. Disinfectants may prevent unimpeded access, rendering the disinfection process ineffective or even impossible.
[0002] As is known, the wool or related raw materials arriving in the form of fleeces (e.g. camel hair, alpaca, mohair, etc.) are processed to They are prepared for spinning, mostly sorted by their fineness in sweat, i.e., sections of different growth fineness are separated by Tearing the fleece. In order to exploit the value of the wool and to process the raw material economically, it is not possible to rely on to forgo this sorting.
[0003] In order to disinfect the wool in question, it could simply be disinfected while adhering to certain protective measures. subject it to a wet wash and add an effective disinfectant to the wash bath. However, such a procedure would... This makes sorting the wool impossible, as the individual fleece pieces become completely jumbled up during washing. With other methods, e.g., When raw wool is treated directly with steam and gaseous disinfectants, the wool becomes damp and felted without the The disinfection effect is sufficient. However, for sorting the raw material, it is necessary to leave the wool in the state it was in when it came from the animal's body. is obtained. Furthermore, reliable disinfection is not guaranteed with the known methods.
[0004] It has now been found that the sortability of the wool can be maintained after complete disinfection if one does not immediately Wet washing is avoided, and the wool is only subjected to a gentle pre-cleaning process using dry methods; during which the wool opens up and the Bacillus spores are exposed. The wool extraction process, which is known per se, using organic solvents proved suitable as this preliminary step. In this process, the wool is not only completely freed from the lanolin, but the hardened dirt particles are also broken down in such a way that the dirt particles in them are approximately The contained spores are exposed; the wool thereby takes on a form which allows the passage of gases without obstruction.
[0005] When wool prepared in this way by extraction is treated with a gaseous disinfectant, a complete [disinfection] occurs. The dangerous germs were killed. After removing the disinfectant residue from the wool, it retains its natural growth form. and can be sorted like ordinary sweat wool. After sorting, the disinfected, germ-free wool can be washed in batches. to remove the sweat and dirt still clinging to her. The wool grease solution produced during wool extraction is, after the solvent has been removed, heated over hot dilute sulfuric acid. refined, thereby also killing any spores that may have entered the lanolin solution. Furthermore, for the safety of the operation, it is necessary to Disinfect the extraction system briefly before each cleaning. For example, mohair wool suspected of containing germs is placed in an extraction apparatus with Trichloroethylene is degreased, freed from solvent, and packed in a disinfection apparatus of any design, where it is activated by a moderate vacuum of about 50 cm and a temperature of about 50° with a mixture of 0.5 1 / cbm formaldehyde and water vapor The treatment lasts approximately one hour. After the disinfectant is pumped out, the wool is removed from the disinfection machine in a dry state. It is removed and sent for sorting.
Claims
[0006] PATENT CLAIM; Method for disinfecting wool suspected of containing bacteria after prior degreasing, characterized in that, - that, in order to preserve sortability, the wool is extracted with an organic solvent in a manner known per se and subsequently treated with a It is subjected to disinfection with known gaseous disinfectants.