DE1027841B - Apparatus for melt spinning organic linear high polymers - Google Patents

Description

Apparatus for melt spinning organic linear high polymers It is known that threads etc. from the melt according to the so-called rust spinning process to manufacture. The starting material is in the form of chips one with one heated grate provided melting device supplied and melted here continuously. The melt collects below the grate as a sump and is then continuously Spinneret fed. Since the heat capacity of the grate is fixed, inevitably always melted the same quantities of melted material. The main difficulty This procedure consists in regulating the Schinelzvorga.n; ges.will namely If too little melt is drawn in, an excess amount of melt is obtained, which is highly undesirable because, as a result of the longer duration of exposure, the high Temperature decomposition symptoms occur. On the other hand, it is too low Melt quantity supplied, the system works inefficiently, (ta the heat capacity is not used in this case.

It is therefore in the essence of what is attached to your melting container Grate and heating, there, l) a really appropriate regulation of the Schinel7_-amount is impossible. The non-controllability of the heat capacity follows from the knowledge, da.ß the heat transfer coefficients when using a steam-like heating medium are constant because the amount of vaporous heating medium due to the same Heating pipe <juers-chnitts and same flow rate the same> le.ilit. One can. thus according to this method with a gel), eiieii melting and heating device only approximately the same titer.

If one is compelled to spin a larger or smaller titer, so one must use a differently dimensioned melting device in which the heating grate has to have a corresponding heat capacity.

It is also still known. according to your so-called rod melting process die Hocli.polyine-ren, which are pressed in solid rod form into heated hollow bodies to be melted and further processed into threads, etc. But also in this one Trap there are a lot of inadequacies, since one is forced to to use precisely dimensioned rods and, on the other hand, to show signs of decomposition cannot be completely avoided ..

Furthermore, one already has a furnace for melting glass developed, which by means of an electric, located inside the furnace: purchase the melt material melts. This melting furnace ordered from refractory, vertical walls standing on a base plate. The melting material can come from a diesel melting furnace continuously deducted. According to another proposal, organic high polymers are used melted in a device filled with inert liquids, the Melt can be drawn off for spinning according to your principle of overflowing. In addition, a device alis melting furnace has also become known, which is very flat lying side surfaces. has, which run into a collecting trough.

These devices are either lard ovens vertical walls or around melting furnaces. those based on the principle of overflow work, or those that have very flat side walls and in a Drain the collecting trough. With these devices no melt of z. B. convert polyamides into usable threads, etc. The polyamides e.g. B. if they are heated a little above the melting point, are very sensitive to air and heat Sulrstan-r_, so that decomposition seeds occur when the melt is exposed to atmospheric oxygen for a long time with simultaneous high heating.

With the devices that have been received, it is therefore not possible to to treat the melt in such a way that it is as short as possible to temperatures. be heated above the melting point.

In the device according to the invention, these shortcomings are largely avoided or eliminated. The device according to the invention features through a funnel-shaped vessel, the cone angle of which is 40 to 90 °, preferably 60 °, is and whose ails melting surface acting jacket surface at the lower end to The purpose of forming a floor gutter is bent downwards, with -this floor gutter a centrally mounted drainpipe is fitted (read through a hemispherical bell is roofed. This device works in such a way that that in each case only that i @ Ienge melt material is melted, which is also immediately can be spun. As a result, even short-term and minor overheating, which would otherwise adversely affect the degree of polymerization, avoided. The heating of these vessels is carried out from the outside, whereby it is advantageous to carry out the heating electrically. The actual melting zone for the melting material is then located along the heated jacket surface. The melted good flows on this: along the outer surface and collects in the floor channel below, from which it immediately overflows into the drainpipe at which. End immediately the Spinning head is attached. The advantages of this melt spin device exist in that one, the residence time of the easily decomposable at high temperatures Melting material is reduced to a minimum, on the other hand it is not what it is with Stick melt spinning is the case, from precisely dimensioned rods, starting out special can use the easier-to-use schnitzel. The hemispherical bell has the purpose of keeping solid, not yet melted particles out of the drain pipe.

The vessel is filled with schnitzel from time to time. Through the Wall heating of the vessel it is possible to reduce the amount of heat in the electrical engineering usual way to regulate.

If one wishes to change the amount of melt because one, another Titer wants to spin, so can. you can do this by switching the required amount of heat regulate without using a differently dimensioned melting device, wherein then this procedure also brings another advantage. One reaches namely at the same time that the melted goods occur without a local overburden can leave the melting zone immediately. The overheating of. Melting material is known in Way avoided by regulating the amount of heat. It will only be so much then Melted nicely well than you have available according to the desired titer would like to. At the same time you can use the special shape of the container for instant Take care to drain the melt.

In the drawing, the device according to the invention is shown.

The funnel-shaped melting chamber 1 is by an electrical or also other heat sources heated from the outside. The lower part of the funnel 5 is closed a flat, ring-shaped. Rioane 3 formed, with the remaining opening is covered by a bell 4 so far that no solid particles fall through: can, but on the other hand the melt flows through the drain pipe 2 and immediately is directed to Pooh. .'y

Claims (1)

PATENTANS1'11I; c: 11: Device for melt spinning of o% aaisehen. linear high polymers, gekenazeichrwt by a funnel-shaped vessel (1), whose The cone angle is 40 to 90 °, preferably 60 °, and its melting surface is acting Major area at the lower end for the purpose of forming a floor channel (3) inwards is encircled, whereby in: this floor channel a centrally mounted drainage pipe (2) is fitted that is covered by a hemispherical bell (4). In Documents considered: German Patent Specifications Nos. 720 950, 650 351; British Patent No. 565,981: U.S. Patent No. 2,437,687.