AT509712A4 - DEVICE AND METHOD FOR GUIDING AND FORMING AN EXTRUDED PLASTIC STRIP - Google Patents

Description

07-JFIN-3010 (DO) 15:01 Patent Paul Rosenich Flux (FRX) + dE3 365 33 01 5. 005/033 07-JFIN-3010 (DO) 15:01 Patent Paul Rosenich Flux (FRX) + dE3 365 33 01 5. 005/033 • • »• r • * • · •»

A458PAT

Apparatus and method for guiding and forming an extruded plastic strand

Description:

The invention relates to a device for guiding and / or shaping 5 of a plastic strand and / or a plastic profile, preferably a plastic tube having a region with variable cross-section and means for changing the region of variable cross-section, wherein the region of variable cross section of a wound flat material, and a related 10 method.

Generic devices for guiding and forming a plastic strand are known in the art. For example, DE 102 13 235 describes a sleeve for calibrating a plastic tube, in which a slotted tube is changed over slidable rods in cross-section to a desired diameter of a

To produce pipe. However, such devices are variable in diameter only in a predetermined portion, since the width of the slot introduced in the sleeve dictates the maximum change in the scope. Larger changes in the diameter lead to the problem that the provided plastic composition, which is supplied via the extruder head of the calibrating device, is insufficient or too large. Consequently, a change of the extruder head is required to provide the required Kunststoffinasse. Furthermore, following calibration, it is necessary to thread the extruded profile until it is cut to length and stacked and stored in a suitable device. In conventional systems, the guide is replaced according to the manufactured profile. Another device in which a wound sheet is set narrower or wider 07/01 2010 DO 14:57 [SE / EM NO 7940] @ 005 OT-JHN-ΞΟΙ0 (D0) 15:01 Patent Paul Rosen i ch AG S. 00Β / 0ΕΕ (FΑΧ) + dE3 £ 65 33 01 t * * 1 · * • * «2

A458PAT and thus the desired diameter is shown, is known from DE 10 2004 052 972

The object of the present invention is to provide a device and a method that allows a stepless Ver-5 position of a wound sheet with relatively simple means.

The object is achieved in claims 1 and 7, 10 In conjunction with the preamble of claim 1, the device-technical task is solved in that the wound sheet forms a closed band which is wound at least two loops with a first loop at least partially wraps around the leading and / or forming plastic profile 15 Further advantageous developments are given in the dependent claims 2 to 6.

In conjunction with the preamble of claim 7, the process object is achieved in that the wound flat mate 20 rial is wound to at least two loops and is changed by increasing or decreasing the loops of the cross section.

Further developments of the method are given in the dependent claims 8 to 11.

07/01 2010 DO 14:57 [SE / EM NR 7848] ®00G 25 07-JRN-E010 (00) 15:01

Patent Office Paul Rosenich RB (FRX) +423 £ 65 33 01 ** * 1 ♦% · «5.007 / 022 3

A458PAT

In the drawings, an embodiment of the invention is shown schematically as Kalibriervomchtung.

Fig. 1 shows a typical extrusion line, Fig. 5 shows a three-dimensional view of the wound sheet and Fig. 3 shows another three-dimensional view in a different setting. FIG. 4 shows a section through FIG. 2 and FIG. 5 shows a section through FIG. 3 again. FIG. 6 again shows three-dimensionally an arrangement of several devices according to the invention and FIG. 7 shows a side view of the arrangement according to FIG.

FIG. 1 shows a typical extrusion line with the device according to the invention. FIG. 1 includes an extruder 11, a tool 12, which is also commonly referred to as an extrusion die, and a vacuum and calibration tank 13. The vacuum and calibration tank 13 may be followed by further downstream equipment such as further cooling tanks, saws and winders, however 20 are not shown here.

In the vacuum and calibration tank 13 is a calibration arranged with an externally accessible adjustment device to change a region of variable cross-section 1. The central focus is the 07/0 1 2010 DO 14:57 [SE / EM NR 7848] @ 007 07-JRN-S010 (D0) 15:01 Patent Office Paul Rosenich flfi p. 00Θ / 0Ξ3 (FflX) +433 Ξ65 33 01 i * iti »* * * *

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A458PAT

Extrusion axis 14, the Extraionsrichtung is indicated by the arrow. The Kunststofßnasse generated in the extruder 11 is preformed in the tool 12 and then further deformed as a molten tube in the vacuum and calibration tank 13 until it has its final state. Figure 2 shows a possible embodiment of a calibration, which is shown here via the device according to the invention as a wound sheet 2, which is held by rods 6, 7, 8 in its shape. The sheet 2 is bent into three loops 3,4, without plastically deform. A first loop 3 forms a circle-10 cross-section whose diameter 5 is determined by the distance 10 between the two pairs of adjusting rods 6. The circular cross-section is free only in the area 9, since there the flat material is guided around the pairs of rods 3 in a second loop 4. From this figure 2 it is also clear that all the rods 6, 7, 8 are parallel to each other and to the extrusion axis 14.

In FIG. 3, the device is shown with a different viewing angle and in a setting for a smaller diameter. The wound sheet 2 again forms three loops 3,4, wherein the middle loop 3 largely forms a circular cross-section which is relatively small due to the spacing 10 of the pairs of guide rods 6. The support rods 7 are widely spaced and tensioned relative to the pairs of guide rods 6 In general, the Stützstangcn 7 should be rigid and serve as a support or suspension for the sheet. 25 The pairs of guide rods 8, which abut the loops 4, prevent the uncontrolled deformation of the flat material 2 and thus ensure that the cross section of the loop 3 is largely a circular cross-section, which rests with its inside on the leading and / or to be molded plastic strand 07/01 2010 DO 14:57 [SE / EM NR 7848] @ 008 07-JAN-2010 (DO) 15:01 Patent Paul Roesch RG (FRX) + il23 £ 65 33 01 s. 009/022 • «* 4 * • * * 1 * * * * *« * «» «4« * * · «5

A458PAT the support rods 6 can be moved and so make the idealization of the circular cross-section to stay as compact as possible and not with the. Tank collide.

FIGS. 4 and 5 each show a section through the device, as shown in FIGS. 2 and 3. 4 shows a section according to FIG. 2 and FIG. 5 shows a section according to FIG. 3. The reference numbers of FIGS. 4 and 5 are analogous to those of FIGS. 2 and 3 and therefore need not be mentioned again. FIG. 6 shows the device according to the invention in a multiple arrangement, wherein adjacent devices are each arranged rotated by 90 ° relative to each other. But it is also possible a different angle. By this rotation of the devices to one another it is achieved that the free areas 9, in which the flat material 2 15 is not applied to the plastic strand, no so-called flow marks he can testify, since the free area 9 is twisted in the adjacent device. The rods 7 and 8 are not shown in this view, but are, as shown in Figure 2, parallel to the other.

The side view of all devices arranged next to one another is shown in FIG. 7, which shows that this arrangement produces a largely closed circular cross-section over the entire length which avoids flow markings on the extrudate. 25 07/01 2010 00 14:57 SE / EN NR 7848] @ 009 07-JRN- £ 01 Ü (OO) 15: 0c! Patent Office Paul Rosenich HB CFRX) + dE3 Ξ55 33 01 5. oio / oee * »* ·« «

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A458PAT 07/01 2010 THU 14:57 [SE / EH NR 7S4S] @ 010

LIST OF REFERENCE NUMERALS: 1 areas with variable cross section 2 wound flat material 3 first loop of 2 5 4 second loop of 2 5 diameter of 3 6 branches 1 pair of rods 7 support rod 8 pair of guide rods 10 9 free area 10 distance 11 extruder 12 tool 13 calibration 15 14 extrusion axis

Claims (12)

□ 7-JRN-clDl 0 (D0) 1 5: □ Ef Patent Bureau Paul Rosenich AG (FAX) + i £ 3 £ 65 33 01 s. on / oe £ ♦ »♦ * # 4« 7 A458PAT Claims 1. Apparatus for guiding and / or forming a plastic strand and / or a plastic profile, preferably a plastic pipe, comprising a section of variable cross-section and means for altering the Variable section region (1), the variable section region (1) consisting of a wound flat material (2), 10 characterized in that the wound sheet (2) forms a closed band comprising at least two loops (2) 3.4), wherein a first loop (3) at least partially wraps around the plastic profile to be guided and / or molded. 15 07/01 2010 00 14:57 [SE / EM MR 7648] @ 011 07-JRN-301 Ο (DO) 15: 0Ξ Patrolman Paul Rosenich HG (FflX) + dE3 Ξ65 33 01 5 012/022 07-JRN-301 Ο (DO) 15: 0Ξ Patrolman Paul Rosenich HG (FflX) + dE3 Ξ65 33 01 5 012/022 2. Apparatus according to claim 1, characterized in that the first loop (3) largely a circular cross-section, which is variable in diameter (5). 3. Apparatus according to claim 1 or 2, characterized in that 5 a second loop (4) unguß the not required for the formation of the circular cross-section flat material 4. Apparatus according to claim 2 or 3, characterized in that the diameter (5) of the circular cross-section of the first loop (3) over the distance (5) of two Verstellstangenpaare (6) is 10 be tunable 5. Device according to at least one of claims 1 to 4, characterized in that within the second loop (4) a support rod (7) is arranged. 6. The device according to at least one of the preceding claims, 15 characterized in that at least two pairs of guide rods (8) are arranged on the second loop (4). 07/01 2010 DO 14:57 [SE / EM NR 7848] ® 0 1 2 07-JRN-2D10 (D0) 15: D Paul Rosenich AB Patent Office (FRX) + d23 £ 65 33 01 5.013 / 022 07-JRN-2D10 (D0) 15: D Patent Patent Paul Rosenich AB (FRX) + d23 £ 65 33 01 5.013 / 022 7. Moving and / or forming a plastic strand and / or a plastic profile, preferably a plastic tube in which a wound flat material (2) has an area of variable cross-section which is changed by means, characterized in that the wound flat material (2) is wound into at least two loops (3, 4) and enlarged or enlarged Reducing the loops (3, 4) of the cross-10 cut is changed. 07/01 2010 00 14:57 [SE / EM NO 7848] g | 013 Q7 - JHN - c? 0 10 (00) 15:02 Paul Rosenich Patent Office fifi (FAX) + d23 255 33 01 5.0I ¢ / 022 10 A4S8PAT 8. The method according to claim 7, characterized in that a change in the size of the loops (3,4) is implemented by means of a change in the distance of pairs of rods. 9. The method according to claim 8, characterized in that the Ab- 5 stood between two pairs of adjusting rods (6) is changed, where at a support rod (7) at a distance relative to the Verstellstangenpaaren (6) is adjusted and thereby the size of the loops ( 3,4) 10. The method according to claim 9, characterized in that over 10 pairs of guide rods (8), the shape of the loops is influenced. 11. The method according to any one of claims 7 to 10, characterized in that a plurality of areas with variable cross-section of successively arranged wound flat materials 15 are changed simultaneously. 07/01 2010 00 14:57 [SE / EM NR 7848] @ 014