DE1083487B - Process for the production of artificial threads with uniform properties and high shrinkage capacity using the viscose spinning process - Google Patents

Description

From time immemorial one has been involved in the manufacture of artificial Threads strive to keep the individual spinning and post-treatment stations running in this way to allow the threads obtained to be of uniform, uniform quality. One has in this Direction made various advances over the decades; namely through the so-called Continuous process. But even with these modern ways of working, the manufacture has become more artificial Cellulose-based threads repeatedly show that the individual process stages in their technical Success are not even. So have the modern drawing processes, especially when Working with two baths, already considerable success with regard to the desired strengths and elongations provided and led to textlien data that fully satisfied. But again and again you have made the unpleasant experience in these processes that the threads produced with them when used led to failures both in the textlien and in the technical ao area. The subject, the usability Increasing such threads has therefore been in the synthetic thread industry for decades constantly discussed.

One is through a large number of technical attempts and proposals to remedy this unexpected Deficiencies came to the realization that in the manufacturing process the good properties, which were achieved in one process step are subsequently reduced or partially canceled became. So could z. B. the successes already achieved in the spinning process are not completely finished Product to be maintained. On the one hand, this has to do with the difficulty of the individual Coordinating process sections so that they complement each other completely, on the other hand but also with the fact that the precision of the apparatus and procedures is not yet so extensive was developed so that perfect uniformity could be achieved at every spinning position. -As already mentioned above, a certain progress has been made in this direction with the continuous process, however, efforts have been directed primarily to relieving tension to produce shrunk threads as possible during drying, z. B. by a conical design of the Drying rollers that take into account the contraction of the thread during drying and / or by coordination the speeds of several drying rollers on the shrinkage.

Experiments in this area of the process have shown that one is very well able to to produce high quality threads by spinning viscose in miller-like baths when you use the threads

for the production of artificial threads

with uniform properties

and high shrinkage capacity

according to the viscose spinning process

Applicant:

United Glanzstoff-Fabriken AG,
Wuppertal-Elberfeld

Dr. Hermann Rathert, Wuppertal-Elberfeld,

and Dr. Ernst Husung,

Grebben (district of Geilenkirchen-Heinsberg),

have been named as inventors

then subjected to stretching in a second hot bath. However, if one proceeds in such a way that the threads, for example in the form of a thread array, are now allowed to continue running under tension and they are thereby subjected to the usual washing treatments, then it turns out that the recovery capacity of the im In the second bath, the threads were not used enough and, above all, not even enough is exploited, which has an effect, among other things, in differences in color, even in single thread breaks.

It is obvious that all the properties which are summarized under the collective term of usefulness have suffered as a result. With such an after-treatment of the freshly spun thread, it has no opportunity to to carry out the supermolecular structure in peace. It is clear that if you have one such, freshly washed The thread is then subjected to drying, these defective parts of the thread structure can be fixed and even reinforced. The conclusion from these observations is that one the thread even if it is the spinning process in the narrower sense in a single or multi-bath process already has behind it, still has to give an opportunity to take its supermolecular structure under gentle and even conditions to complete.

In addition to the uniformity, it is important for the quality of certain textile products, e.g. B. for as tire cord too using rayon threads, it is important that

009 530/460

Claims (5)

3 4 the thread has a certain shrinkage capacity exposed to temperatures of over 100 ° C. It has been found in investigations of cord to, and it is driven so that the thread sheet processing threads found that those with on the roller system no opportunity to a high tendency to shrink z. B. 10% gets a very shrinkage. It has also proven to have a much longer service life and, better, a higher 5, that the thread sheet can withstand the roller system and changing loads than has to be left with a moisture content which known cord yarns with a lower shrinkage is not less than 60%. The final drying is carried out with the same strength and elongation closing without tension. In this drying method, a special process has resulted, according to which one with 60% io so that the thread on the roll carbon disulfide produced viscose with a system under tension and exposure to temperature gamma number of 50 to 60 in the second bath and after the temperatures above 100 ° C down to a moisture content washing. Subsequent drawing of not less than 60% within the roller system allows the production of high tension decreases considerably and the lowered torsion-resistant cord yarns, but these threads retain tension up to this moisture content, as their Shrinkage tendency, however, if the thread immediately finished is not sufficient and, in addition, its evenness would not be dried, i. H. well below the critical number fully meets the requirements. . of 60% water content, the voltage would increase. It has now been found that the task can be increased considerably. According to the invention, even threads for cord yarns are now produced in such a way that drying below this critical point also has a certain and at the same time high shrinkage table number of 60% water content on a second, can be solved by using the following drying system and who would otherwise apply procedural steps: tendency to increase the voltage by giving in that 1. After coagulation in the spinning bath, the one the peripheral speed of the take up freshly spun Sets the threads in a second, hot roller at the end of the drying process so that Bath stretched as high as possible so that the tension in the second part of the drying process 2. then post-treated without tension, is kept below the value that the thread at 3. Has possessed a release / exit of the drying roller system without tension due to an avivage bath. drawing element, the drying is thus in the present process 4. made from there under a predetermined tension in a 3 ° ren so that one in a first stage or several stages of a heated roller - up to a water content that is not below 60% system, on which it lies at tempe- rature, pre-dries under decreasing tension, currency over 100 ° C, without the opportunity to rend one below this water content with de-shrinkage to have, except for a water content conditions, in which the thread sheet dries be dried, which is not less than 60%, 35 is given the opportunity for further shrinkage. 5. whereupon they are placed on a second drying system the tension with which it retracts the drying unit and the thread sheet after the first drying system left, fully dried the drying exits with a well-defined tension, will. is for an equalization within the thread The following should be noted in detail. The 40 systems took care. Tension-free follow-up treatment begins with the fact that this procedure has particular importance, such as the thread already in its acidic state completely free from - already mentioned briefly above, for the production of can shrink. This is made of corduroy in various forms, since it can be used in the Arführbar according to the invention, partially in hand, the final shrinkage For example, it has proven to be useful ^{to determine 4} S of the goods beforehand, which is easy to do. the thread can be done in a known manner on a turntable by that one in the second or conveyor belt and put it on this pre-drying stage of the voltage increase occurring directions without tension, all washing and re-threading of the thread is not perfect, but only in one subject to treatment procedures. It has yielded to such an extent that the thread afterwards the furthermore shown that it is essential that the thread shows the desired tendency to shrink, before it is collected by a receiving organ, compared to previously known threads, in particular also completely tension-free of a dampening compared to the aforementioned high-torsion-resistant threads, feed, whereby the thread has the opportunity to be produced by another known method. absorb as much moisture as he can hold. are, the stand out according to the invention This is achieved by further finishing in 55 manufactured threads, in particular due to their high quality De-energized state. The receiving organ for shrinkage tendency. This property is how The thread sheet can then be used as a squeezing device, which has been confirmed by recent studies be trained. The thread can also be the reason for a greater durability of the cord yarns, the superfluous loads that are constantly changing in the tire, even before the acceptance unit, Decrease the amount of water. 60 are set. But beyond this progress opens According to the invention, the drying must be carried out as follows - the method according to the invention is a path that can be guided. It is essential to pre-determine the amount of shrinkage by choosing the tension of a drying roller system at a well-defined height.
To apply tension, that is, that the degree of shrinkage that the threads should have later, already through 65 patent claim:
the amount of voltage applied is predetermined is. The higher the tension is kept under using the method of making artificial threads the predrying is carried out, the higher the uniform properties and high shrinkage later the shrinking capacity of the thread can exist after the viscose spinning process. The roller system is heated so that the 70 is characterized by that the freshly spun Threads, after they have undergone maximum stretching in a second, hot bath, Wet-treated without tension, fed without tension through a finishing bath to a take-off unit and from there under a predetermined tension in one or more stages to a heated roller system on which they are at temperatures above 100 ° C, without the opportunity to To have shrinkage, to be pre-dried to a water content which is not below 60% is, whereupon it is on a second dry system below the voltage with which it left the first drying system, ready to be dried. Considered publications:
German Patent Nos. 812 338, 746 930;
Austrian Patent No. 136 367;
Pummerer, "Chemical textile fibers, films and foils", 1953, p. 1152, last paragraph, lines 1 to 5. © 009 530/460 6.60