DE1089539B - Continuous belt press for the production of plates from chips, fibers or the like. - Google Patents

Description

GERMAN

It is known to produce chipboard and fiberboard in a continuous pressing process. This takes place the pressure between endless steel belts, either by pressure elements <in the form of rollers are guided, the rollers can rotate, but are themselves stationary, or from Pressing elements of two endless link chains, which are designed as plate links, put under pressure will. Here, the continuously fed material to be pressed is grasped by the plate members and pressed together, it moves continuously with these and after the hardening of the binder is released by these. The plate links sweep the circulation of link chains in reverse Location back to their starting point. This type of continuous feeding of the pressed material and the pressing makes it possible to produce panels of any desired length and in a significantly more uniform manner To produce quality. However, in the first-mentioned type of continuous press, breathing becomes between the pressure elements designed as rollers are not prevented before the resin has cured. Further the steel belts are subjected to excessive stress due to the line contact with the rollers. In the The type of press mentioned further on, perform the plate links when they are put on and taken off the steel belts Due to the forced rotation around the chain deflection wheels, a relative movement to the belts, d. h., the Plate members are z. B. not yet entered the flat track when creating when the steel belt already applies. The gap angle still between the plate members goes to zero and Until then, this results in increased friction between the plate links and the steel belts. In this way the steel belts will gradually wear out in continuous operation, especially when the steel belts are under tension. This also applies to the lifting of the plate links from the steel belt at the end of the press too. The large number of moving parts has an unfavorable effect on the energy requirements of the system and strung together parts. The friction that occurs in roller and journal bearings and the friction of the plates with one another and with the deflection wheels in the reversing zones increase disadvantageously the driving force to be applied. Also leaves the exclusive design with steel bands only a material to be pressed with a relatively low moisture content. Which is during the pressing Strongly developing steam with very wet material to be pressed cannot be achieved with a steel belt cover escape through the surface, but must emerge laterally between the steel strips, whereby the Material to be pressed is carried away by the high steam pressure. The one for reversing the pressing elements under

Continuous belt press
for the production of panels
from chips, fibers or the like.

Applicant:
Institute for Wood Technology

and fiber building materials,
Dresden A 20, Zellescher Weg 24

Hansjüxgen Krämer and Herbert Kirsten, Dresden,
have been named as inventors

The use of deflection wheels requires a relatively long construction due to the link length large building expansion.

In contrast, in the belt press according to the invention, there is a dense sequence of revolving, designed as a carriage Pressing or heating elements are provided, the movement of which is synchronous with that of the steel or sieve belts he follows. A special feature is that, after passing through the transition zones, the wagons do not reversed position, change their direction of movement. This revolving of the car takes place continuously, so that the material to be pressed can be pressed continuously. The pressing or heating elements designed as a carriage run with their front and rear wheels on rails with different distances and are at the ends of the track can be raised and lowered by coupling gear.

This constructive solution makes it possible to significantly reduce the number of friction links and the wear and tear of the steel belts due to the horizontal placement and lifting of the pressure elements greatly diminish. The small space requirement of the coupling gear allows a relatively low overall height of the system, because the reversal of the pressure elements no longer via chain pulleys takes place, which must have large diameters because of the link length.

The pressing of the pressed material takes place between belts that have a smooth or uninterrupted shape Have a sieve shape (e.g. bronze sieve belt and smooth steel belt for fibreboard with high humidity or two smooth steel belts for chipboard)

009 608/289

Claims (4)

3 4 their surfaces opposite to the pressed material umlati- numbers of the metals used and by under- fende pressing or heating different contact surfaces in the interior of the material to be pressed elements can be moved by means of endless tension elements. 11 reaches an asymmetrical temperature gradient, Thereby pressure and heat are generated by the car so that for a specific cross-section the cover transfer the material to be pressed. The material to be pressed is at a lower temperature during 5 area of the material to be pressed 11 the transport through the press is under pressure for as long as the base area (or vice versa). From it held until the binder has hardened or there is a lag in the temperature at the top generally the previously unbound chips, fibers side of the pressed material opposite its underside. od. The like. To a stable plate in pressed thickness While in the latter the setting of the pressed material are connected. io starts, the off- The belt press according to the invention can be delayed for both binding, and a time difference occurs the production of panels from chips, fibers in the setting process, which is necessary to the or the like (the moisture content of the pressed material can still develop inside the pressed material, 70% and more) than, as is known, also remaining water vapor on the not yet set (below Use of additional devices) for the 15 NEN top side to escape through the sieve Application of veneers and / or flexible foils or on the underside that has not yet set, lien made of metal, plastic or paper in the same if the steel belt at the top and the sieve work step be used. The heat supply is running on the underside. It is advantageous that to the press is adjustable. the pressing elements not directly on the material to be pressed Due to its construction 20, the entire system has an effect, but only to a relatively small extent via the pressure. The changeover, smooth steel belt 9 or sieve belt 10, from fiber to chipboard production. This means that no markings are created or visible by replacing the sieve belt with a bar step at the pressure element transition in the pressed material, smooth, uninterrupted steel belt. After the material to be pressed 11 has passed the pressing zones X to Z In the drawing, a belt press according to the invention has passed through, this takes place in the transition zones tion in one embodiment, schematically, lifting the car 1, 2 from the pressed material 11 without any posed. Buckling (without mechanical stress) of the The smooth steel or sieve belts 9, 10, one after the other, in uninterrupted succession, and without corrugation (each only shown once) pressing of the material to be pressed 11 by means of front and rear elements 1, 2, which are designed as wagons, 30 wheels will run on tracks with different spacing at the end and beginning of the career within and the pairs of rails 3, 4 in the transition zone only Belt circulation raised or lowered gradually and precisely equidistantly by coupling gears 7, 8 and return in this way in an over-sunk. This creates an extensive chocolate zone back to their starting point, whereby the tension and wear and tear of the steel or sieve are reduced their position in comparison to the forerun (working tape a. gang) does not change by turning it over. Die Preßele- The gap between the cars 1, 2 is in elements are at the same time heating elements and are kept very low limits and is controlled by the bridged with the continuously fed pressing material 11 in the smooth surface or sieve belt. She is ever- Forced run. Each time the car is lowered into it, it is sufficient for the thermal expansion that occurs Transition zones are reversed in such a way that 40 are dimensioned. By means of one on each sprocket 13, 14 the carrier-supported endless chains 13 ', 14' arranged in the rails 3 'and 4 become the carriages 1, 2 Open the traps 15 and move them to the carriages 1, 2. The upper part of the press including heating seen driver 5, 6, the outer rail pressure carriage 2 is arranged vertically adjustable, let pass unhindered. By precisely metering the pressed material, each Since the carrier and rail tracks can only be used with the 45, the desired panel thickness can be used without Lowering the car cross, allows the own- that a separate adjustment device is required weight of the car that will open the catch. The raising and lowering of the upper part of the press at the moment when the vertically directed Ge takes place in a known manner hydraulically, pneumatically "Important component the pivot point of the device or mechanically from the central control panel. exceeds. After the wagon wheel of the outer 5 ° The final The rail releases the catch, closes the pre-loosening belts 9, 10 are via reversing drums 12 direction by itself again. directed. The lower smooth surface band 9 is, as usual The transition zones allow through the coupling, extended at the entrance of the system, so that the transmission has a low overall height of the system. Furthermore, pressing material 11 can be applied unhindered, they allow a short, in the closed heat. As a result, the upper belt or sieve is submitted in a known manner that the radiation losses are reduced. The pressed material, which is still loosely poured, becomes the. With this arrangement, the output can be held moderately high by a roller, the steel belt or the sieve of the pre-temperature for the renewed passage from the inlet into the horizontal web, whereby a considerable amount is diverted, pre-pressed before the printing elements adhere to Heating energy is saved. Lay the bed horizontally. The back pressure is generated the heating of the printing carriages 1, 2 is done electrically, the pressure is already in a horizontal position and the current is supplied via sliding contact elements of the lower part of the press during the work process,
is removed from busbars. You can use _,
the upper and lower surface of the pressed material 11 under- 65 patent claims:
different amounts of heat can be supplied. By 1. Continuous belt press for production, the arrangement of a steel belt on the underside of plates made of chips, fibers or the like. B. in a pressed material with high moisture carriage trained pressing or heating elements (1, speed, is through the different heat conduction 70 2), the movement of which with that of the endless steel or sieve belts (9, 10) with the exertion of pressure on • these is synchronized and the direction of travel in the transition zones in the non-reversed position change. 2. Belt press according to claim 1, characterized in that the designed as a carriage Pressing and heating elements (1, 2) with their front and rear wheels on rails (3, 3 'and 4, 4') run at different distances and lift at the ends of the track by means of coupling gears (7, 8) and can be lowered. 3. Belt press according to claim 1 and 2, characterized in that in the rails (3 'and 4) Driver traps (15) are provided, which are in • the transition zones at the ends of the Laiufbahn are located, due to the weight of the carriages (1, 2) open and, after they are attached to the carriages (1,2) arranged driver (5, 6) have crossed the rail track unhindered, after release through which the wagons can close again by themselves. 4. Belt press according to claim 1 to 3, characterized in that the carriages (1, 2) or belts (9, 10) to achieve an asymmetrical temperature gradient inside the pressed material (11) can be heated differently. Considered publications:
German patent specification No. 936 718. 1 sheet of drawings © 009 608/289 9.60