SE440800B - PROCEDURE FOR CLEANING SPRING SPRINGS - Google Patents

Description

lD 15 20 25 30 1712s3s + 1 nisk cleaning bath.

A process for treating textile materials in an organic cleaning bath containing 2, 4, 4'-trichloro-2f-hydroxy diphenyl ether is further known from BE A 731 478.

With regard to the above-mentioned publications, it can be stated that cleaning of textile materials and cleaning of springs cannot be compared with each other. Textile materials do not have the fibrillation structure characteristic of down or other springs, and it is absolutely surprising to the person skilled in the art that the elasticity as well as the insulating effect of springs are not affected by the cleaning with detergents in the form of chlorinated hydrocarbons. The structure of the finest processed springs is such that the person skilled in the art must, on the contrary, assume that these springs are disturbed by a chemical cleaning procedure. The product would thus be worse. According to the invention, this disadvantage is avoided, as the drying takes place only at relatively low temperatures. This prevents the springs from being subjected to a heat shock and the springs are damaged due to the sudden removal of the chemical cleaner at a high temperature. According to the invention, it is thus essential to carry out a drying at relatively low temperatures after the cleaning with detergents in the form of chlorinated hydrocarbons, whereby, however, a disinfection to the required extent cannot be achieved; To carry out this disinfection, 2-2-4'-trichloro-2'-hydroxydiphenyl ether and / or chlorine-substituted phenols soluble in the rinsing liquid were used. The combination of the measures now provides the opportunity on an industrial scale to also clean heavily soiled springs and obtain a product with the required high-quality properties, which is surprising to those skilled in the art. The combination of measures according to the present invention is of course not apparent from the combination of the previously known news material; In the following, some examples of such substances are given, but in principle a number of additional agents are available to Lill fnckmanen with similar chemical and washing properties. In many cases, not only one agent can be used, but in some cases a plurality of different agents in the same or different washing steps, for example in one step an odor-destroying agent and in another a disinfectant. You can also use two such agents in one washing step. It is particularly suitable to use agents which, after drying, adhere to the spring surface in effective concentrations, so that the springs are not only freed from their own odor or their pre-existing bacteria, but also in the long run the effect is achieved.

Particularly suitable for odor neutralization, but also with a strong disinfectant effect, are additives in quantities of 0.005-D, 05% by weight of aldehydes with the general composition R-CH = 0, where R can be: a) an alkyl residue Cn H2n + 1 (n = D, 1,2,3, ü) or b) a mono- or dicarboxylic acid radical having 1-5 C atoms or c) -CH = O or d) a substituted or unsubstituted benzene nucleus To simplify the process, it is of course best to add the aldehydes directly to a washing bath. In many cases, it may also be advisable to spray the springs during the drying process with an aldehyde solution to remove odors, which have been noticed afterwards. It is also possible to use mixtures of such aldehydes. The amount of additive depends on both the type of aldehydes and, above all, on the degree of fouling of the springs. Because the quantity of aldehyde used is so small, in many cases certain experiments have to be performed. It has been found that too much aldehyde leaves a faint, sweet aldehyde odor.

In particular, it has been found that an aqueous solution of methanol, which is commercially available under the trivial name formalin, is a substance which is both economically advantageous and easy to use. Methanol is a gas, but formalin, on the other hand, is liquid. Experiments have shown, however, that other substances, such as propanal, i-butanal, glyoxal, glyoxalic acid or benzaldehyde, can also be used. It is obvious that other homologues of these substances can also be used within the framework of the requested patent protection. It is then strange that sufficient effect is achieved with such small quantities, calculated on the total amount of washing bath.

It is also possible to equip per se known amplifiers, for example the "Therporan" specified in the following embodiment (manufacturer: Chemische Fabrik Pfersee) with a quantity of methanal. If the emphasis is on the bactericidal part of the use, soluble deodorizing and / or disinfectant chlorine-substituted phenols are particularly suitable for this in the washing bath. In this case, it is not only a matter of obtaining practically complete freedom from traces after the purification, but that this also continues and is not completely degraded after prolonged use and many washes. It is therefore advisable to provide the bactericidal agent with a long-term effect, i.e. it should be wash-safe and adhere in sufficient concentration to the springs. Particularly suitable for this purpose is a bactericidal agent known per se with the chemical designation 2,4,4'-trichloro-2'-1-hydroxydiphenyl ether (Irgasan DP 300; manufacturer: Ciba-Geigy, Basel) . In particular, the bactericide in question is used in a rinsing step, since the springs have already been subjected to a first and a second washing step. At the last rinsing, the rinsing liquid, eg water, is added with 0.01 ... 0.03% by weight of the latter substance and the springs are rinsed therein for a sufficiently long time at a temperature of 55-6508. The springs can then be dried.

In order to avoid shrinkage of the springs by the heat shock during drying, this can be carried out at a temperature lower than 10000. A steam jacket dryer suitable for this purpose is suitable, in which the drying steam blown into the heat jacket has a temperature of 105 ... 115 ° C, whereby the temperature in Lnrkun itself remains below 10000. According to the invention, a purification process according to SE 7 606 396 is used for purification and pretreatment of raw springs originating in Europe and China. 5, in which the wash bath is either non-aqueous or does not contain pure water. The following steps differ from previous procedures: a) chlorinated hydrocarbons are used as degreasers and purifiers; b) the disinfection process, which in previous processes is carried out entirely in the dryer, takes place already during the washing with the aid of highly effective trace-killing agents; c) the drying process is carried out at a lower temperature, which does not damage the springs.

The temperature in the interior of the dryer - measured in the least favorable places - is significantly below the temperature of 9000 required for clean water procedures, which is necessary for disinfection. Since by adding deodorizing and / or disinfecting agents in connection with washing bath temperatures of about 6000, it is possible to remove and kill the dirt particles and spores adhering to the feathers, it is possible to refrain from disinfection by heat at over 90 ° C. .

Studies have shown that the number of spores on the springs processed in the manner described above has been considerably lower than for springs processed according to the method hitherto. On the day of the test, samples taken from each batch, which were purified using the previous and new processing methods and examined for the trace content at the State Veterinary Laboratory in Münster, resulted in bacteria isolated from feathers purified according to the previous method. , whereas, on the other hand, no reproducible spores could be detected on feathers processed according to the new method.

By adding the disinfectant immediately before drying, it is achieved that disinfectant remains on the springs after drying, which could also be determined at the examination at the State Veterinary Laboratory in Münster. In so-called inhibitor tests with "bacillus subtilis", a microbicidal effect could be determined on the springs.

From a hygienic point of view, there are no objections to the use of the above-described purification procedure with chlorinated hydrocarbons, in particular perchlorethylene, with the subsequent addition of a highly effective disinfectant to kill poper.

A post-treatment with higher temperature steam is of course possible, where either a complete removal of the perchlorethylene before drying is ensured or where the drying proceeds so slowly that the sudden evaporation of the perchlorethylene does not lead to any thermal shock.

The method according to the invention not only makes it possible to clean and use such springs, which due to health reasons and high soiling have not hitherto been able to be used, so that they can now be used, but also by improved disinfection and long-term protection a considerable hygienic progress, which must be considered unexpected.

For further details of the procedure and a suitable device for this purpose, see SE-A 7 6Û6 396-5, to which the present application relates.

The procedure is described in more detail in the following exemplary embodiments. It should be pointed out that the water content of the washing bath can vary. The basic material for all baths is chlorohydrocarbons, such as perchlorethylene or tetrachlorethylene, which are known in the purification art. The springs are dried in the air stream. The optimum temperature for the adhesion of methanal during drying has been found to be BOÛC.

Example 1 25 kg of heavily soiled chicken feathers are placed in a three-chamber-cylinder washing machine 10 specially designed for operational purposes with a working capacity of 100 kg, calculated on textiles.

The washing process takes place in three washing steps. First, the springs are washed in 300 liters of perchlorethylene without additives for 5 minutes. and centrifuged for 2 minutes. The contaminated perchlorethylene is purified by distillation; the strongly fatty precipitate, which has been made trace-free by the action of heat during the distillation, is taken to a destruction plant.

Then the degreased springs are washed again in a second washing step with a mixture of 300 liters of water with 200 g of "Therporan OP" as purification enhancer at a temperature of about 6000 for 5 minutes. When this washing step is completed, the bath is pumped out and the springs are centrifuged (2.5 min.).

In the third washing step (rinsing step), length about 6 minutes, the springs are rinsed with water at 6000. In the water is added 0.02% by weight of 2,4,4'-trichloro-2'-hydroxydiphenyl ether ("Irgasan").

When the washing is completed, the bath is pumped away and the springs are dried by centrifugation, until they no longer stick together. They are then blown into a steam jacket dryer via a closed suction line, the heating jacket of which is heated with a drying steam of 105 ... 115 ° C. The vapor pressure in the heating jacket amounts to 1.4 bar.

The temperature inside the dryer is significantly below 9000.

After drying, the feathers have a neutral odor and are disinfected. They can now be used as desired.

Example 2 25 kg of duck springs are washed. First, a prewash (first washing step) is performed with subsequent centrifugation as in Example 1.

In the subsequent second washing step, wash skin is added with a volume of 300 liters of water with 200 g as detergent and 5 g of formalin with 40% by weight of metal "Therporan OP" and washed at a temperature of about 6000 for 5.5 minutes.

After this washing step, the springs are centrifuged. .._..__._.__._.__..___.__.______.__. ,

Claims (1)

1. when _; 1'- .ha - u. 10 15, 'dehydration and chlorinated phenols. In this case, it has been found that in the third washing step (the rinsing step), the springs are rinsed with pure perchlorethylene, added with 0.025% by weight of "Irgasan". In the last example, a combination of both the two agents being tested is complementary and A patent for cleaning poultry feathers, in which the feathers are washed in one or more washing or treatment steps in a dissolving and dispersing washing bath and then dried, washed and degreased in a first washing steps with a chlorohydrocarbon-containing cleaning agent, for example perchlorethylene, that the springs are then washed in a second washing step with water characteristics, fountain springs and detergents at a temperature of GÛÛC and that the springs are then treated with a rinsing liquid in a rinsing step, for example, water which is Read out 0.01-0.03% by weight of 2,4,4'-trichloro-2'-hydroxydiphenyl ether or 0.000l 0.05% by weight of soluble, chlorine-substituted phenols soluble in the rinsing liquid at a temperature of 6000, and that the springs are finally dried until they no longer adhere and then blown with an air stream in a steam jacket dryer and dried there at a temperature of the steam jacket blown drying steam of 105-11500, the temperature in the drying chamber remaining below 10 ° C. 0 0