JPH0834045A - Large-width sheet extrusion die for extrusion press for producing film or sheet out of thermoplastic synthetic resin - Google Patents

Abstract

PURPOSE: To provide a wide-sheet extrusion die mold for an extrusion press for producing a thin film and a plate from a thermoplastic synthetic resin. CONSTITUTION: A wide-sheet extrusion die mold has a mold block 1 and two extrusion die lip parts 2, 3 made of a metal, especially a thermal refined steel extending over the entire length of extrusion die width and arranged at a distance limiting an extrusion die slit width 5 and at least on extrusion die lip part 2 is formed as a rigid beam over the total length of the extrusion die width and the thickness errors of a thin film and a plate comprising thermoplastic synthetic resin produced by this extrusion die mold is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wide sheet extrusion die die for an extrusion press for producing a thin film and a plate made of a thermoplastic synthetic resin, which is provided over the entire length of the die block and the extrusion die width. The invention relates to a wide sheet extrusion die mold having an extrusion die lip made of metal, in particular structural steel, arranged at a distance that extends and limits the extrusion die slit width.
Such a wide sheet extrusion die mold must have an extrusion die slit width that is adjusted with narrow tolerances over the length of the wide extrusion die width. If this fails, there will be a thickness error across the entire width of the thin film or plate being manufactured, which would have to be corrected tediously.

[0002]

In the case of known wide sheet extrusion die dies (German Patent No. 3497912), both extrusion die lips, which are present over the entire length of the extrusion die width, have elastic extrusion dies. It is an edge piece. One extrusion die lip is
It is used for coarse adjustment of the slit width of the extrusion die by means of mechanical coarse adjustment members, such as screws, which are distributed over the entire length of the extrusion die edge. The other extrusion die lip is used for fine tuning. For this reason, this extrusion die edge piece is connected to a piezo adjusting member which is distributed over the entire length thereof and is controlled according to a ratio of a thickness error adjusted over the entire width of the thin film or plate. There is. Further, a thickness error measuring device is arranged in a lateral direction corresponding to the width of the thin film or plate to be manufactured, and a control device corresponding thereto is also equipped. To this extent, the known methods are subject to systematic errors which themselves change during the working time of the apparatus for producing thin films or plates from thermoplastics using wide sheet extrusion die dies. This is due to the fact that the correspondingly arranged elastic extrusion die edges cause adjustment errors due to tolerances and have to be readjusted with great effort. Annoying deformations may also be triggered by the static pressure of the thermoplastic synthetic resin during the working steps of the extrusion press.

[0003]

SUMMARY OF THE INVENTION The present invention reduces the error in the thickness of the thin film or sheet produced in wide sheet extrusion die molds due to the elastic extrusion die edge adjustment tolerances. It is based on the technical problem.

[0004]

In order to solve this problem, the present invention relates to a wide sheet extrusion die die for an extrusion press for producing a thin film and a plate from a thermoplastic synthetic resin, which is a die block. And, the metal, especially structural steel, having two extrusion die lips extending over the entire length of the extrusion die and arranged at a distance that limits the slit width of the extrusion die, in which case, At least one extrusion die lip is formed as a rigid extrusion die beam over the entire length of the extrusion die width, and the extrusion die beam is connected to the mold block via an elastically deformable bridge, And in that case, a wide sheet extrusion die die whose extrusion die beam can be adjusted by at least one adjusting pinion as a rigid member under the deformation of the bridge is targeted. That. A rigid member means, within the framework of the invention, that the member is virtually not elastically deformed during operation and that it behaves like a rigid beam.
According to a preferred embodiment of the invention, the extrusion die beam, together with an adjusting pinion and a deformable bridge, forms an adjustable static system in itself. In order to produce static qualities, it is desirable to deploy a deformable bridge so that the bridge can be deformed with relatively little force of the adjusting pinion. However, it is also possible that the extrusion die beam is connected as a beam on two supports to two adjusting pinions and, as such, is arranged such that it is adjustable under the deformation of the bridge. Is.

According to the present invention, in the case of a wide sheet extrusion die mold, a rigid extrusion die beam has a wide range of so-called constant reference points for controlling the thickness of a thin film or plate to be produced from a thermoplastic synthetic resin. It is based on the recognition that the sheet can be formed over the entire groove length of the sheet extrusion die. By strengthening the known resilient extrusion die lip to an extrusion die beam, the alignment error due to the extrusion die lip tolerance is eliminated. Rigid extruded die beams are also associated with manufacturing-related tolerances, but this is constant and can be transferred to a calculator, thereby producing a thin film or plate from a thermoplastic synthetic resin. In this case, it is obvious that the work can be performed by using the wide sheet extrusion die according to the present invention.

Rigid extrusion die lips in wide sheet extrusion die dies for extrusion presses for producing thin films and plates from thermoplastics are known per se (see US Pat. No. 3,940,221). . However, in this case the extrusion die beam is not connected to the mold block via an elastic bridge. The alignment of the rigid, extrusion die lip, formed as an extrusion die beam, involves the steps that may cause obstacles in the thermally plasticized synthetic resin flow path within the wide sheet extrusion die mold. is there. In a known embodiment, the extrusion die beam is fastened to the mold block with one screw and with another screw the position is dependent on the ratio of the interface between the extrusion die beam and the mold block. Is adjustable. In this case, formation of an obstacle stage may occur in the flow path for the thermoplastic synthetic resin. Furthermore, in the case of this known embodiment, the adjustment play is relatively small, whereas in practice a considerably larger adjustment range is required, which is due to the dimensions required for the production of extremely thin membranes. On the contrary, it must be possible to adjust with a large adjustment range up to the dimensions for manufacturing thick plates. The adjustment distance is 10 mm,
Or even more.

Hereinafter, the present invention will be described in detail with reference to the drawings in which one embodiment is described.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT The wide sheet extrusion die mold described in the drawings was specified for an extrusion press for producing thin films and plates from thermoplastic synthetic resins. The basic structure thereof includes a die block 1 and extrusion die lips 2 and 3 made of metal, particularly made of architectural steel, extending over the entire length of the extrusion die width 4. In FIG. 2, the extrusion die width 4
Is indicated by a double arrow. The extrusion die slit width 5 is also visible in FIG. 2 and it is observed that the extrusion die lips 2, 3 are arranged at a distance that limits the extrusion die slit width 5.

According to the present invention, at least one of the extrusion die lips, that is, the extrusion die lip 2 in the embodiment.
Is formed as a rigid extrusion die beam over the entire width of the extrusion die, and is designed and arranged so as to be connected to the mold block 1 via an elastically deformable bridge 7. Hereinafter, reference numeral 2 is also used for the extrusion die beam. Further, the extrusion die beam 2 is connected to the bridge 6
The arrangement is such that it can be adjusted by means of at least one adjusting pinion 7 as a rigid member under the deformation of.

In an exemplary embodiment, and also in accordance with a preferred embodiment of the invention, the extrusion die beam 2 together with an adjusting pinion 7 and a fully elastically deformable bridge 6 is a single adjustable itself. Form a statically determinate system. To that extent, it is desirable to compare and observe FIGS. 1 and 2. Within the framework of the invention, the extrusion die beam 2 is connected as a beam on two supports to two adjusting pinions 7 and, although not shown in the drawing, a bridge 6 as such. It is also possible to arrange the arrangement so that it can be adjusted under the deformation of.

In FIG. 1, the extrusion die beam 2 is moved through the adjustment pinion 7 when the wide sheet extrusion die die is started so that the wide sheet extrusion die die is in the adjustment position which does not change during operation. It turns out that it is adjustable.

In the frame of the present invention, the extrusion die beam 2 is
In some embodiments, there is a corresponding arrangement of extrusion die lip lip 3 which is elastically deformable over the entire length of the extrusion die width. It is also a requirement of the present invention to determine the thickness error laterally with respect to the width of the membrane or plate using suitable auxiliary means and to transmit the measured value to a suitable control device which acts on the adjusting pinion. Control technology method.

The extrusion die beam 2 may be provided with a corresponding extrusion die lip portion, which is embodied as a rigid extrusion die beam and can be adjusted in position according to another operation, over the entire length of the extrusion die width. To that extent, in FIG. 1, the upper extrusion die lip 3 must at the same time also be shown as a virtually rigid member. However, FIG. 1 shows an elastically deformable extrusion die lip lip 3 which is arranged corresponding to the extrusion die beam 2.

[Brief description of drawings]

FIG. 1 is a side view of a wide sheet extrusion die mold according to the present invention.

FIG. 2 is a front view of the mold of FIG. 1 seen from the direction of arrow A.

[Explanation of symbols]

 1 Mold Block 2 Extrusion Die Beam 3 Extrusion Die Lip Edge Piece 4 Extrusion Die Width 5 Extrusion Die Slit Width 6 Bridge 7 Adjustment Pinion

 ─────────────────────────────────────────────────── ─── Continuation of the front page (71) Applicant 591069293 Reifenhausel, Gezelshaft, Mitt, Beschlenktel, Haftung, Unt, Companie, Maschinenfabrik REIFENHAEUSER GESEL LSCHAFT MIT BESCHRA NKTER HAFTUNGIN & FEDERATION Republic, 5210, Troisdorf, 15, Spichel, Strasse (No.) (72) Inventor Robert, Wirz Germany, 53844, Troisdorf, Henderstraße, 45 (72) Inventor Achim, Koun Germany, 53859, Niedel Kassel, Fumerich, 48 (72) Inventor Anton, Lüphausen Germany, 53819, Neunkirchen-Seelscheid, Im, Krumauer, 7 (72) Inventor Heinz, Weisemann Germany, 51147, Cologne, Nibelungstraße, 75

Claims (6)

[Claims] 1. A wide sheet extrusion die die for an extrusion press for producing thin films and plates from a thermoplastic synthetic resin, the die block (1) and the extrusion die width (4) over the entire length. At least one extrusion die lip, having two extrusion die lips (2, 3) made of metal, especially tempered steel, arranged at a distance that extends and limits the extrusion die slit width (5) (2) is formed as a rigid extrusion die beam (2) over the entire length of the extrusion die width, and the extrusion die beam is attached to the mold block (1) via an elastically deformable bridge (6). Wide sheet extrusion die mould, which is connected and whose extrusion die beam (2) is adjustable under the deformation of the bridge (6) by at least one adjusting pinion (7) as a rigid member. 2. A wide sheet extrusion die mold according to claim 1, wherein the extrusion die beam (2) is an adjusting pinion (7).
And a wide sheet extrusion die mold that forms a static system with a deformable bridge (6) and is adjustable as such. 3. A wide sheet extrusion die mold according to claim 1, wherein the extrusion die beam (2) is statically connected to the two adjusting pinions (7) as a beam of two supports. And as such, a wide sheet extrusion die mold that is adjustable under deformation of the bridge (6). 4. The wide sheet extrusion die mold according to claim 1, wherein the extrusion die beam (2) is connected to the adjusting pinion (7), and the wide sheet is inserted through the adjusting pinion. A wide sheet extrusion die mold that can be adjusted at the start of the wide sheet extrusion die mold so that the extrusion die mold is in its original adjustment position that does not change during operation. 5. A wide sheet extrusion die mold according to claim 4, wherein the extrusion die beam (2) has an extrusion die width (4).
A wide sheet extrusion with correspondingly arranged elastically deformable extrusion die lip strips (3) over the entire length of the sheet and which can be adjusted according to the task while correcting errors in the thickness of the thin film or plate. Die mold. 6. A wide sheet extrusion die mold according to claim 1, wherein the extrusion die beam (2).
In the wide sheet extrusion die mold, the extrusion die lip formed as a rigid extrusion die beam is disposed correspondingly over the entire length of the extrusion die width, and this can be adjusted according to the work.