DE1989597U - HOT MELT EXTRUDER. - Google Patents

Description

The innovation relates to a heated corner press to? Processing of thermoplastic plastics »to which the raw material is fed in an already plasticized state.

It is known to use the raw material to be processed in a screw press in a plasticized, doughy state as a tape or film give up, then melt in the screw press with simultaneous pressure build-up and then extrude in the usual catfish. In contrast, it creates considerable difficulties, one for conveying and extruding the thermoplastic Mass to build up enough high and even pressure in the screw press when the plastic state of the raw material when pouring into the screw press the area of tough consistency exceeds, well the Sohneckengünge in a mushy or even liquid mass find little resistance and are therefore not able to grasp the filled mass and compress *

On the other hand, efforts are made to use the ready, melted thermoplastic that occurs in Processing® or polymer insulation systems Material immediately and without intermediate cooling on one Further processing of the screw press, because this material already has a pulpy to liquid, for example honey-like consistency, which is used for spinning synthetic fibers,

• 2.

Bag. 58O Gm

Threads or wires, for the production of pollen, etc. eowleso must have.

However, since this has so far been due to insufficient pressure build-up in the The screw press did not work, it was common to do this when processing to process thermoplastics in reactors, autoclaves and the like and this then in a special working gear of a screw press abandon, in which it is melted again, then compressed and homogenized and finally through a shaping tool is extruded · After, however, now special in screw presses Devices such as axially extending feed buttons, feed or metering pumps in the extruder inlet, special snow cap seals to the drive side of the screw and special degassing sections have been proposed that the intake ratios for pulpy to liquid applied materials significantly improve, so that in the screw press surprisingly fast for extrusion Build up required high pressure ISBt, the advantageous is available immediate processing of pulpy to liquid melts in Nothing in the way of screw presses

Such an immediate processing of hot melts in screw presses also brings with it the solution of another problem, which is known to be due to the high temperature of such melts and the molecular degradation under repeated thermal stress, even if the thermoplastics may also be exposed to heat any number of times are deformable without damage, repeated exposure to heat, which heats the thermoplastic until it melts, is always detrimental with regard to its physical properties.Avoiding multiple melting through immediate further processing without intermediate cooling accordingly represents a considerable improvement in the processing of thermoplastics nitttls a screw press.

"-J ■ * Bag. 580 gm

While it was previously necessary, pulpy to liquid melts Let it cool down at least to the toughest possible consistency «in order to even process it on a screw press to be able to, and accordingly the intake part of snails «» press tibial ^^ - construction «r-t-Junbe heated or even particularly cooled, it comes after the knowledge of the innovation 'today where it succeeded is to pull thin, low-viscosity thermoplastics into the screw press and to the required high pressure of To bring 230 atü and more, it is essential that a Cooling of the melt in the feed point and reheating on the melt temperature in the subsequent cylinder zones of the Screw press and the associated molecular degradation is avoided.

In order to achieve this, it is proposed according to the innovation that heating devices are provided around the feed channel (s) to the extruder, including any pumps arranged in this or these, as well as on or around the filling area of the extruder and optionally in or on the machine part surrounding the screw shaft. These heating devices can expediently be independent of the rest of the cylinder heating. Furthermore, thermal insulation layers and / or a cooling channel can be arranged between the heated machine parts and the screw shaft bearing to be protected from high temperatures. Finally, for the processing of hot melts by means of such a screw press, it is proposed to keep the temperature of the melt at approximately the same level on the way between the processing or polymerisation system delivering it via the feed section of the extruder to its subsequent cylinder zones *.

With the proposed measures, significant improvements can be achieved in the processing of thermoplastics by means of an extruder, which primarily have a positive effect on the quality of the extrudate because molecular degradation is prevented.

- 4 · ■

"J. _β bag. 530'Om

facilities themselves can be of any known type and training.

In the drawing, an embodiment of the innovation is shown schematically

The already melted thermoplastic material accumulating in a processing plant arrives via line 1 with the, for example, in the patent ··. (Bag · 578) described degassing; "" chamber 2 with vacuum connection 3 In the filler neck 4 of the screw press 5 and is in the intake zone 6 provided with a pocket-like cross-section extension according to patent ·. · (Bag detected and conveyed to the extruder tool (not shown) *

According to the innovation, heating devices lo »11» 12 »IJ, Ik, 15 are arranged around the feed channel I ₄ in which a pump 9 is provided if necessary * around the degassing chamber 2 and around the filler neck 4 as well as around the feed zone 6 of the screw press © 5 These heating devices can be controlled independently of the rest of the cylinder heater 16 * and, if necessary, depending on the temperature of the melt supplied to be set up

The worm 8 is on its shaft 17 against the housing of the worm press 5 sealed by means of a sealing bushing 18 and in the transmission housing 19 stored. According to the innovation are to interrupt the heat conduction from the screw cylinder or from which the feed zone 6 and the The highly heated machine part surrounding the worm shaft 17 to the adjacent bearing or gear housing 19 to be protected from the heat between these the thermal insulation rings So and 21 arranged «Finally the gear housing 19 can also be equipped with a special cooling * central channel 22 be equipped

Claims (2)

.Bag * 580 Gm protection against spray 1. Heated screw press for processing thermoplastics to which the raw material is supplied in an already plastified state, characterized in that around the
or diV ^ uϊüϊϊ5 ^; k ^ n ^ lβ ~ - ^ l ·) - ^ ura - extruder (5) including the possibly arranged in this or these pumps (9) and on or around the filling area (4, 6) of the extruder and if necessary, heating units (10, 11, 12, 15, 14, 15) are provided in or on the machine part surrounding the screw shaft (17)
are. 2. screw press .nach claim 1, characterized in that the heating device (10, 11, 12, O, 14, I5) from the rest Cylinder heater (16) are independent. 3. Screw press according to claim 1 or 2, characterized / that thermal insulation layers (20, 21) and / or cooling duct (22) are arranged between the heated machine parts (5) and the corner shaft bearing (1 $) to be protected from high temperatures . . , - "■ '-. -" - · .. "- ■■■■■ - .- ■■ - .. ■ ϊίΐϊ ^ δίδ! Bfese tfrfelcei- l§e * 4fSmfrmi- & feansp4 & * dte zuefzf e! N- ^ liia; e ^! o vrikhi from the word, fos3ung & r i'r-2i ''> g ·;.:. .1. ■; Λΐ ^ ιι Ün * 3riaoen from. The legal · .Becteui »-. · -; ■. ■■ <■ "- ■ wt-- '" ,: ' · ■ '< ^! »- * ^f gprüff. The originali! .I'ii:.; I.:. R: ·.;. ^: ', : .. Γ.ΐ-ϊ ^ η Leflncfen in dsri "Amfsafcten. S <=>:. ■ ..... ··." - ie -; .. "-..- .- ■ :. · Ϊ Machwsis des reclsriioheii fei. ^ Üj. -: '. I. ^ Ji-ei. On request hie.w, <c ^ hr ^ i / v ^ Mn odsr film negatives for cisn usual Freisa »i yeüsferf. Deulschss Patent Office, Gebrauehsmusterstelle.