WO1999020448A1

WO1999020448A1 - Device for the continuous production of flat material webs

Info

Publication number: WO1999020448A1
Application number: PCT/AT1998/000247
Authority: WO
Inventors: Karl Morgenbesser; Josef Nebel; Christian Reichhold
Original assignee: Berndorf Band Ges.Mbh & Co. Kg
Priority date: 1997-10-21
Filing date: 1998-10-19
Publication date: 1999-04-29
Also published as: AT411450B; ATA178097A

Abstract

A device is disclosed for the continuous production of consolidated flat material webs, in particular with parallel planes, preferably foils and particle boards, made of plastic masses, for example plastics, which consolidate when the temperature changes. The device has a frame (1), at least one upper and one lower uninterrupted band (4, 5), in particular made of steel, horizontal drive (3) and deflection rolls (4), gauging rolls (11, 12, 13, 14) set against the upper or lower band and having an axis (23) fixed by holders to the frame at the axial ends of the axis (23), and a rotationally symmetrical, in particular cylindrical, casing (24) which surrounds and is supported on the axis (23). The casing (24) has a bearing (37, 38) at each of its two axial end regions, separate from the axis (23) and the axis holders (27, 28), and is supported on the axis (23) outside of its two end regions, in particular in a central region which preferably corresponds to half the length of the casing.

Description

Device for the continuous production of flat material webs

The invention has a device for the continuous production of, in particular plane-parallel, solidified flat sheets

Material webs, preferably foils, particle boards, with plastic masses, for example plastic, with an upper and a lower endless belt to the object

In the production of flat material webs, the constant thickness is of particular importance. The uniform thickness should not only be maintained over time during production, but also be ensured transversely to the longitudinal direction of the material web. The uniform thickness is important both for quality reasons - there must be certain ones

Tolerances are met - and high demands are made to save material

Double-belt systems, e.g. double-belt presses, generally have upper and lower drive and deflection rollers.These rollers can have a large diameter and are essentially rigid. Between the rollers, the respective moving belts are held against each other by rollers or also calibration tubes. Because of the space is limited for such support rollers, they can not have the diameter of the drive and deflection rollers, but are dimensioned much smaller and do not have the required stability at high pressure

From US 5 044 491 A, a roller is known which has an axis and a hollow cylinder surrounding it. The axis has two circumferential rings in its central region trained elevations, which are in contact with the inner wall of the hollow cylinder. The axis is further tapered within the hollow cylinder and is not in contact with the hollow cylinder in the end areas. If the axis is deflected, to which the entire force is transmitted, the holder of the The height of the axis can be changed so that the deflection can be compensated for to a high degree. Due to the conical design of the axis, there is no additional deformation of the hollow cylinder caused by the axis. However, such a support roller has the disadvantage that the jacket in its end regions undergoes a higher deformation

DE 38 38 852 Cl describes a press roll with controllable deflection for treating a paper web. The roll has an axis and a jacket surrounding it. The jacket is trimmed via a hollow pin and a roller bearing on a holder, which in turn is a slide bearing for the axle A deflection of the axis is forcibly passed on to the jacket via the roller bearing and the hollow pin and vice versa. The bearing for the jacket is in a common

Bracket with the bearing provided for the axle. This prevents the movements between the jacket and the axle from being decoupled. Due to the pressure medium provided in the pressure chamber, the jacket cannot be braced on the axle, since, as is known, hydraulic pressure from the medium into all

Directions are given evenly This ensures that the jacket is oriented evenly with respect to the axis

Another roller for the treatment of webs, in particular paper webs, is described in DE 33 43 313 AI. Also with this roller, the bearing of the jacket is not independent of the bearing of the axis, so that here, too, no decoupling of the movements can take place Space between the axis and the jacket through a plurality of ring-shaped seals, which are arranged in the axis, in heating rooms, can have the effect that different thermal loads are achieved

The roller arrangement according to DE 26 25 048 AI relates to a roller with an axis and a jacket. In the axis, which is arranged via a high-pressure fluid cylinder, there are sensors that can measure the pressure exerted on them. However, such sensors do not allow the linearity of the Coat to determine

EP 0 732 183 A2 discloses a double belt device which has calibration rollers which have an axis and a hollow cylinder mounted thereon.The hollow cylinder lies on the sheet metal strip and is acted upon along its generatrix by hydraulic cylinders arranged in the axis in order to achieve a linear one To allow the hollow cylinder to bear against the sheet metal strip. Such a device is complex and requires continuous control and pressurization with the hydraulic fluid

The present invention has for its object to provide a double-belt system that can have a plane-parallel gap, which is guaranteed not only in the area of the drive and deflection rollers, but also in the work area after these rollers. Furthermore, the plane-parallel distance should also with high forces simple means with particularly low tolerances over the entire work area

The invention is based on a prior art as given by EP 0 732 183 A2 The device according to the invention for the continuous production of, in particular plane-parallel, solidified flat material webs, preferably foils, chipboard, with piatic masses, for. B. plastic, which solidify with temperature change, with a frame, at least an upper and a lower breakthrough-free belt, in particular made of steel, with horizontally arranged drive and deflection rollers, calibration rollers which abut the upper or lower belt and which have an axis have, which is fixed to the frame via brackets on the axial ends of the axis and a rotationally symmetrical, in particular cylindrical, shell surrounding the axis, which is supported on the axis, consists essentially in that the shell is separated from the two axial end regions of the Axis and the holder for the axis each have a bearing and the jacket outside of its two end regions, in particular in a central region, which preferably corresponds to half the jacket length, is supported on the axis. A device for the continuous production of material webs is formed by the endless upper and lower perforation-free belts, the horizontal arrangement of the drive and deflection rollers permitting an even distribution of the masses to be consolidated in the gap between the two belts due to gravity. By simply or repeatedly supporting the jacket of the calibration rollers between the two end areas on the axle, force can be transmitted from the jacket to the axle, which is particularly advantageous in the central area. Whereby, due to the fact that the end regions of the casing are supported independently of the axle and the mounting of the axle, some of the forces exerted by the belts are not introduced into the axle, but instead reach the frame directly from the casing. There are therefore two mutually independent brackets and force transmissions, so that the linearity of the Support rollers can be guaranteed with the simplest design measures. An exact plane-parallel alignment of the belts of any length can thus be achieved, the working area, that is to say the area in which a plastically deformable, in particular at least partially liquid or flowable, material is present, being of preferred importance.

Is the jacket between its two end regions on the axis, for. B. stored on a plain bearing, the axis itself can be arranged rotatably on the frame, whereby a particularly high accuracy in the height adjustment of the axis, since no bearing play is to be taken into account.

If the storage of the end regions of the casing is arranged on the frame, an exact relative position is inevitably between

Given axis and coat.

If the brackets of the axle are adjustable in height, the axle can be preloaded depending on the pressure required between the belts.

If the axle is spring-loaded, the required preload of the axle can be carried out using the spring force.

If the jacket has at its two axial end regions a hollow cylinder-shaped flange releasably connected to the jacket, which is mounted on the frame, simple hollow cylinders can be used, which can additionally be provided with a bearing, so that conversions in existing double-belt systems in particular can be done easily. If the brackets of the axle can be adjusted along wedge surfaces that form an acute angle with the axle, there is a change in the height of the axle, which can absorb high forces

If the brackets at the ends of the axle, preferably an upper and a lower sub-brackets, viewed in the axial direction one behind the other from the axis, bending moments can be applied in addition to the height change of the axle, thus providing a targeted introduction of force to compensate for the production of the material tracks the forces acting on the caliber can be achieved

If the bearings for the jacket are highly variable, an additional constructive possibility is created to counteract an undesired deformation of the jacket, for example with prestressing forces

If the jacket has bearings at its two end regions, one behind the other and in particular at a distance, in particular two, when viewed in the axial direction, additional desired deformation of the jacket can be caused by the introduction of moments

If sensors for measuring the linearity of the jacket are provided, by means of which the height change of the mounting of the axis and / or the mounting of the jacket can be carried out, a particularly easy-to-use device is provided which allows automatic control of the linearity of the jacket of the support roller

Are pressure-sensitive sensors, in particular piezo elements, arranged in the two end regions of the jacket, via which the change in height of the support of the axis is controlled, in particular regulated, the determination of the absorption of the forces can already take place electrically, the height change of the axis or pretensioning of the axis then being able to be carried out again electrically via this electrical variable

The invention is explained in more detail below with reference to the drawings

Show it

1 shows a double belt system in a schematic representation,

Fig. 2 is a Kalibπerwalze with storage, partly in section and

Fig. 3 a storage of the jacket of Kalibπerrol 1 e on the axis

The device shown in FIG. 1 has a frame 1 which carries the entire device, in particular the guide rollers 2 and drive rollers 3. The longitudinal spacing of the axes of the rollers is 7.20 m, but can be larger, for example 100.00 m. Through these rollers, a lower belt 4 and an upper belt 5 with a width of 3.00 m made of high-gloss polished steel, which possibly carries a high-gloss chrome plating, are moved in the direction of arrow v at a uniform speed. By the two horizontal guide rollers 2 with a diameter of 1.80 m and the upper and lower bands 4, 5 cooperating with them, a gap 6 is formed, which is only in the area of

Deflection pulleys is located, in which a protective nozzle 7 of an extruder, not shown, for example thermoplastic, such as polyacetals, polyvinyl chloride, polycarbonates, Polymethy lmethacry late, polymers or their prepolymers are introduced. The protective nozzle essentially feeds into the gap in its entirety transversely along the belt. The distance between the deflection rollers 2 is regulated by a hydraulic ram 8, which determines the distance between the upper carrier

9 for the upper pulley 2 and the lower bracket 10 for the lower pulley The two brackets are part of the frame

Seen in the direction of movement v of the belt, there are an upper and lower calibrating roller 11, 12 after the inlet gap 6, which link the belts 4 and 5 and hold them at a smaller distance from one another than in the entire inlet gap 6. The drive rollers 3 each have their own drive motor 3a and 3b on The further calibration rollers 13, 14 have a common drive 15, which ensures a synchronous movement of the calibration tubes 11, 12, 13 and 14. Hardy disks, not shown, are provided in the linkage 16 of the common drive 15 in order to prevent slight misalignments of the linkage, If necessary, other joints, such as cardan joints, can be used. The additionally provided upper rollers 17 and lower rollers 18, which can be designed to be displaceable in the horizontal and vertical, merely have the task of the upper one or lower band and if necessary l keeping calibrating towards the other band

Sensors 19 with a radiation source, in particular lasers, are arranged in front of or after the calibration rollers, which are either movable transversely to the length of the band or, as is the case in the center and each 100.00 cm from the center, are arranged transversely to the length of the band, which are measured by a distance, for example interference. the alignment of the Measure rolls or the strip and, depending on the target values, usually a flat formation of the strips, the calibration tubes act on

To measure the thickness of the product web, a radioactive β-radiation source 1 e 53 is provided outside the area of the band in an analogous arrangement and number as the interference sensors 19 and sensors 54, via which, if necessary, an additional control for the change in height of the axes and the jacket is carried out can

In addition, temperature sensors 20, u z IR radiation measuring elements. Above and below the band to control the fluid used for temperature control. The temperature sensors 20 are based on the band transverse extent in the

In the middle and then on both sides of it, 65.00 cm and 130.00 cm away. Tcmpeπereinπchtungcn 21 and tempering of the lower band are provided for tempering the upper band

The calibrating roller 11 shown partially in section in FIG. 2 has an axis 23, which is covered by a jacket 24 with a wall thickness of 15.0 mm. which is arranged at a distance from the axis is surrounded. The jacket 24 has an inner diameter of 95.0 mm and a rubber coating 25 with 8.0 mm

Axle 23 with a diameter of 80.0 mm is not on the jacket and is fixed on the lower and upper bracket 27, 28 on the frame at a distance of 90.0 mm. The brackets iron each plate springs 29, 30 by moving the Haltcrungen along the wedge flat 31, 32, which include an acute angle α of 30 ° with the axis, the desired forces can be applied to the axis by the fact that the Haltcrungen at an axial distance from each other attack the axis, moments can be applied to the axis, whereby an additional desired bending of the axis can be achieved

The jacket 24 is connected by screws 35 to the annular flange 36, which in turn is mounted on the frame 1 by means of roller bearings 37, 38. The bearings 37, 38 are also arranged at an axial distance of 70.0 mm from one another, so that, if desired, additional bending force e can also be applied via the hydraulic cylinder / piston units 39, 40 the wedge-shaped surfaces 32 and 33 can be displaced so that the desired forces can be applied, for example by measuring the linearity with the sensor 19

The bearing 38 can also be moved along a wedge surface 46, as a result of which additional forces can be applied to the casing in the form of the bend thereof. A piezo element 47 is provided for displacing the bearing 38, which, as is known, undergoes a length change due to the action of electrical current. leads to the determination of the forces exerted by the coat on the

Bearing 38 are exercised, a further piezo element 48 is provided, which converts the compressive forces exerted on the jacket into electrical variables. These electrical variables can also be used to control the cylinder / piston units 39, 40 for displacing the brackets 27, 28

Cylinder / piston units can also be replaced by piezo elements, so that the shifting of the bearing can be achieved not by hydraulic forces but by electrical forces

3 shows the support of the casing in the central region of the axis 23 in the form of a slide bearing. The axis 23 has a shrunk ring 41 which is part-spherical Has surface 42, which cooperates with a complementary part-spherical surface 43 of the further ring 44, which is arranged in the groove 45 inside the shell. The further ring 44 is divided into individual ring segments, so that the same is introduced through an opening, not shown, in the shell can be

The central area, which is formed by half the longitudinal extension of the casing on both sides to the center of the casing, can also have one, two or more supports. The end areas of the casing can either themselves or, as shown in FIG. 2, have extensions with bearings with roller bearings

With a width of more than 3.00 m of the calibration tubes, the springs of the bracket of the axle are pretensioned against the belt with 300 kp. The jacket is supported with an elevation of 0.7 mm due to such double storage of both the axle and the jacket the deviation of the jacket in its end area can be limited from 2.0 mm to 9 μ

The bearings for the casing of the calibration rollers can also be arranged on a common frame. The forces acting on the casing can be measured by only one sensor, for example a piezo element, load cell or the like, which is arranged between the frame and the frame

claims

Claims

Patent claims:

1. Device for the continuous production of, in particular plane-parallel, solidified flat material webs, preferably foils, chipboard, with plastic masses, eg. B.

Plastic, which solidify with temperature change, with a frame (1), at least one upper and one lower perforation-free band (4, 5), in particular made of steel, with horizontally arranged drive (3) and guide rollers (4), calibration tubes (11 , 12, 13, 14) which abut the upper or lower band and which have an axis (23) which is fixed to the frame by means of holding cranks on the axial ends of the axis (23) and a rotationally symmetrical, in particular cylindrical, axis , Jacket (24), which is supported on the axle (23), characterized in that the jacket (24) at each of its two axial end regions separate from the axle (23) and the holder (27. 28) for the axle Storage (37, 38) and the jacket (24) outside of its two end regions, in particular in a central region, which preferably corresponds to half the length of the jacket, is supported on the axis (23).

2. Device according to claim 1, characterized in that the jacket (24) z ischen its two end regions on the

Axis (23), e.g. B. is mounted on a plain bearing.

3. Apparatus according to claim 1 or 2, characterized in that the storage (37, 38) of the end regions of the casing (24) on the frame (1) are arranged. Device according to one of claims 1 2 or 3, characterized in that the mountings (27. 28) of the axis (23) are high-range

Device according to one of claims 1 to 4, characterized in that the axis (23) is held in a resilient manner

Device according to one of claims 1 to 5, characterized in that the jacket (24) has a hollow cylindrical shape at its two axial end areas

Jacket detachably connected flange (36) on ice, which is mounted on the frame (1)

Device according to one of Claims 1 to 6, characterized in that the holders (27, 28) of the axis (23) can be adjusted along wedge flats (32, 33) which form an acute angle () with the axis

Device according to one of Claims 1 to 7, characterized in that the holding posts at the ends of the axis

(24). preferably an upper and lower part holder (27, 28), viewed in the axial direction, support the axis (23) one behind the other

Device according to one of claims 1 to 8, characterized in that the mounting (37, 38) for the casing (24) is of high variation

Device according to one of claims 1 to 9, characterized in that the jacket (24) at its two end regions in

Viewed in axial direction, one behind the other, in particular two bearings (37, 38)

REPLACEMENT BLAπ (RULE 26) Device according to one of claims 1 to 10, characterized in that sensors for measuring the linearity of the jacket are provided, by means of which the change in height of the holder (26. 27) of the axis (24) and / or mounting of the jacket is controlled, in particular regulated , is

Device according to one of claims 1 to 11, characterized in that pressure-sensitive sensors, in particular P l ezoel elements, are arranged in the two end regions of the casing, by means of which the height change of the holder (26, 27) of the axis (24) is controlled, in particular regulated , is