DE1653185B2 - Hot plate press - Google Patents

Description

start at one edge and alternate with ao

the bores of the first row of channels (S) and the The invention relates to a hot plate press, connected to a wider row of channels (9), one run as a single or multi-daylight press, for which form secondary circuits (Figs. 8 and 5). position of chipboard, fiberboard and the like, with

13. A hot plate press according to claims 1, a fixed press table and a movable press to 10, each with two rows of channels in the press plate 25 bear, which are designed as box spars and as a whole and the end plate, characterized in that they can be heated and cooled and each from that for one Overheating of one or both edge press plate, end plate and stiffening webs cross-sections of the pressure plate (1) and the end and transverse ribs exist, the pressure plates and plate (2 ') the entrances of both heating loops the end plates for the passage of heating (II, II-II) are provided with a vertical above or above or coolant with rows of channels,
under arranged hole on the respective for economic considerations and around an opposite side of the press plate (1) or warping of the press table and press ram by high of the end plate (2, IT) are connected to prevent the heating temperatures, one is now alternating with holes the first in the production of hot plate presses of the pre-channel row (6 or 8) or the second channel type mentioned above went over to press row (7 or 9) are connected, or that a table and press ram itself to form as a press plate the first two vertically one above the other and to be heated or cooled as a whole (cf. interconnected bores with the one in e.g. German Auslegeschrift 1 154 255).

the same level adjacent hole. The heating takes place in the usual way by and only then alternately with bores of the 40 through bores in the press plate and the Abersten Channel row or the second channel row circuit plate connected in a simple row next to each other are (Figs. 10 to 12). are installed horizontally, heating medium flows. That

14. hot plate press according to claims 1 heating medium can in the press plate and the Abbis 13, characterized in that weider kept within the closing plate at the same temperature Circuits, regulating or mixing valves are added, or you can use differentiated heating are arranged. a certain deformation of the press table or press

15. Hot plate press according to claims 1 bear and thus bring about the pressing surface. But this to 14, characterized in that it can only happen slowly because of thermal stresses Control of the heating or cooling of the between the heated plates and the non-heating press, Temperaturmeßstellenn in the heated or 50 th webs the press bars (press table and press ram) Could destroy the cooling medium at the inlet and outlet of the press. Thermal stress caused by plates (1) and the end plates (2, 2 ') differentiated or even heating of the Konbracht are. struktion occur, affect in length and in the

16. Hot plate press according to claims 1 width and can deformations in the presses 15, characterized in that cause for the 55 spars with which a flat surface of the Control of the heating or cooling of the press plates can no longer be achieved. A pressed material the press in the heating or cooling medium is only of poor quality, the result. The edge parts the exits of the press plates (1) and the off and the four corners come as a result of the additional connection plates (2, 2 ') Temperature measuring points on borrowed heat radiation away particularly unfavorably. are brought. 60 Another disadvantage is that the

17. hot plate press according to claims 1 gang of heat demand in high performance quickly to 16, characterized in that both the and is required in spurts. This leads to uplifting primary circulation as well as the two secondary borrowed temperature differences and thus likewise Circuits on each of their own heating ducts or to thermal stresses in the press bars, special heat exchangers with circulating pump 65 differently in the pressing surfaces because not enough heating closures are. medium flows.

18. Hot plate press according to claims 1 The invention is intended to solve the problem 17, characterized in that the primary end, the hot plate presses of the aforementioned

1 653

To develop the type in such a way that the disadvantages mentioned can be avoided, d. H. that on the one hand that Occurrence of thermal stress in the press bars even during rapid heating and largely with intermittent heat extraction from the press plates when the press is in operation can be avoided. On the other hand, desired deformations of the press plates should also be accurate can be controlled, so that a plane-parallel pressure transfer of the pressing surfaces of the press table and Press ram is always guaranteed during the pressing process.

This object is achieved according to the invention in that each of the webs has one or more has rows of bores arranged below them parallel and perpendicular to the pressing surface, and that the rows of channels of the pressure plates to a primary circuit, the Bohruligen of the webs to one or two secondary circuits and the rows of channels of the end plates are connected to the primary or a secondary circuit of the heating or coolant.

In this way, undesired thermal stresses between the pressure plates or the end plates and the webs are advantageously avoided, so that the pressure plates remain plane-parallel. Above all, the inventive measure to include the webs in the heating or cooling, not only a heat balance or an equal temperature distribution in all parts of the press table and press ram can be achieved easily and quickly, but negative press plate characteristics (+ or -) can be equalized be that the individual webs throw differently heated and thus either a train or a pressure is exerted on individual points of contact between the press plate and webs. In practice, this can be achieved in that individual cross-sections, which are above or below the neutral plane AB, are supplied to the left or right side of the webs more or less heat in order to achieve a different expansion. By dividing the bores of the press plates, end plates and webs to be acted upon with heating and / or coolant in several circuits, a sensitive and precise control de / plane parallelism or a deliberate deviation from the plane parallelism of the press plates can be made. Furthermore, by heating the webs, a large amount of heat is stored in the box spars, which counteracts excessive amounts of heat chipped during the shock-like heat extraction during the pressing process. In order to further increase the heat storage of the box spars, in an advantageous hamlet of the invention, the press plates and / or the end plates of the box spars have at least two rows of channels, which are arranged parallel to the pressing surface in different planes and which are connected to the primary circuit or to one or both secondary circuits are connected.

In order to quickly compensate for the heat loss on the pressing surface during the pressing process or the at the beginning of the pressing process due to the release of heat to the material to be pressed, there are differences in temperature to equalize as quickly as possible between the press plates and the other zones of the box spars, the work Heating circuits preferably run in opposite directions, so that the stored heat capacity from the overall construction for heating the heating zones of the Press plates is available.

Depending on requirements, the respective press operations, the circumstances and the experience different heating or cooling circuits can be used to evaluate the individual press the individual bores or rows of channels in the pressure plates, the end plates and webs are expedient in several circuits with heating * and / or KUhI- medium to load. The following seven versions examples are to be used with preference:

1. For the heating of the box spars, the bores form those adjacent to the pressing surface first row of channels of the press plate a primary circuit, while the holes in the den Web facing second row of channels of the press plate parallel to the holes of the Channel row of the end plate and with two symmetrical to the neutral plane of the box Holme arranged heating loops of the Bohrun gene of the webs are connected in parallel to a secondary circuit.

2. For the heating of the box spars, the first row of channels in the press plate forms a primary

»5 circuit, while the second row of channels is the Press plate with a heating loop of the bores of the webs above the neutral plane in parallel to a first secondary circuit and the row of channels of the end plate with a also parallel connected heating loop of the Web bores are combined under the neutral plane to form a second secondary circuit.

3. For the heating of the box spars, the first row of channels forms the press plate and, in series connection, the outside of the box spar facing first row of channels of the end plate a primary circuit and the webs facing second row of channels of the end plate are connected in series with the second row of channels of the press plate to form a secondary circuit connected, the bores of the webs being connected in parallel to the secondary circuit in a separate heating loop.

4. For the heating of the box spars, the first row of channels of the press plate ..men forms the primary secretion, while the second row of channels forms the Press plate parallel with a heating loop of the holes in the webs above the neutral plane and in parallel with the second row of channels of the Abschlussplattec and one as well parallel second heating loop of the holes of the webs under the neutral plane to one first secondary circuit and the first channel row of the end plate to a second Secondary circuit are summarized.

5. To heat the box spars, they form the first row of channels and, in series connection, the second row of channels of the press plate a primary circuit, while the first row of channels and π Series connection, the second row of channels from the end plate to a first secondary circuit connected and the bores of the webs over and under the neutral plane in parallel form device are combined into a heating loop of a second secondary circuit.

6. For the heating of the box spars, the first row of channels form the press plate and in rows

Io

I 653 185

circuit for this purpose, the first row of channels of the first row of channels or the second row of channels closure plate a primary circuit, while the are bound. The heat distribution in the second row of channels of the press plate with a par- holmen can be particularly expedient in that the heating loop of the bores, which is connected in parallel, flows and controls that the first secondary circuit and the second are arranged _{within the webs above the neutral plane to form a 5-circuit regulating or mixing valve} Canal are.

row of the end plate with an also With hot plate so far the Einparallel connected heating coil of the borings directions for the temperature control of the Heizgen of the webs of the neutral plane for slabs and the press table and press ram second through Temeinem secondary circuit zusammenge- ₁₀ peraturmeßwerte controlled, which in certain Places are summarized. of the heating plates by means of surface contacts or through 7. The thermocouples are measured for heating the box spars, which are accommodated in additional * first channel row of the press plate in series connection bores of the heating plate. Austen with the first channel row of the final output values for the control and regulation are plate a primary circuit, while the second i ₅ accordingly the temperatures existing in the material of the heating plate in the eye channel row of the press plate in series view of the measurement. Additional measured values for the second row of channels of the end plate can also be connected from other points to form a secondary circuit and a heating loop can be drawn from the press table or press ram to control the secondary circuit. The disadvantage here is that bores in the webs above and below the new temperature-tral plane obtained by material measurement are connected in parallel. values with the ones that have actually already been brought in.This means that due to the correct thermal energy output, the laying of the individual circuits above and below the heat only spreads slowly in the large masses of the neutral level, the overall construction of the box or until the temperature equilibrium is reached heated holmes largely free of distortion or in a specific and unheated part of the press table or a deviation from the plane parallelism in the press ram, ie the control can be maintained according to the material surface. Temperature measurement is far too slow and can be decisive for a flat surface that cycle times for a pressing process of a few equal temperature ratios above and below the grooves do not work precisely because the temperature-neutral level exists. Especially through the loading ₃₀ propagation with temperature compensation in the press table heating of the webs is a largely distortion and press ram takes hours.

Free influence of the box spars and thus of an advantageous development consists in the fact that the press table and press ram reach. for controlling the heating or cooling of the A particularly favorable heating of the press plates press in the heating or cooling medium on the on and off and cover plates is made possible by the arrangement of 35 gang of the press plates and the end plates several rows of channels, if for loading - Temperature measuring points are attached or that for heating the box spars the two rows of channels of the control of the heating or cooling of the press plate by two heating loops, which each start on the press in the heating or cooling medium groove at one edge and alternate with the drilling Exits of the press plates and the end plate wrestled the first row of channels and the second channel 40 temperature measuring points are attached. Connected by the row, forming a primary circuit, the temperature measured at the outlet of the heating plates and if the doors are used to heat the box spars, information and exact values are obtained via two rows of channels in the end plates using two heating loops between the inlet and outlet of a circuit, each The amount of heat absorbed by the heating plates begins at one edge, and alternately with the bores of the first _45, which are to be used for precise control of the heating time or channel row and the cooling time connected to the second channel row, or which are the temperature, form a secondary circuit. difference of the heating medium between on and off With these types of heating it is possible, the gear is a measure of an exact and sensitive heating time between two pressing processes and thus control.

also to shorten the pressing times. But there is also a 50 An advantageous measure of the invention

uniform and distortion-free temperature distribution in the fact that both the primary circuit and also!

In the press and end plates, the two secondary circuits are each connected to their own

is sufficient to compensate for the greater radiation on the heating duct or heat exchanger with circulation

At the edge of the box spars it is useful if the pump is connected. The individual

a hot plate press with two rows of channels in each of 55 heating channels and circuits as required

the press plate and in the end plate for a different temperatures. A special one

Overheating of one or both edge cross-sections the sensitive, exact and possibly different

Press plate and the end plate, the inputs lent control of thermal expansion in the individual

both heating loops with a perpendicular above or components can thus be achieved

60 A favorable type of heating for the box spars, se

overlying sides of the press plate or the Ab- es for the press table or press ram is further thereby ge

Circuit plate are connected, which then alternately give that the primary circuit so much more ai

with holes in the first row of channels or the two heat energy is supplied, as flun through dii

th channel row are connected, or that one of the greater radiation and heat extraction durcl

the first two vertically one above the other, with one another the material to be pressed is lost

other connected bores with the same press surface shortly before the end of the pressing process

Chen plane adjacent bore connected original plane parallelism and thus au

and only then alternately with holes that the pressed material acts

9 10

For a correct heating or series connection in terms of thermal expansion, the first row of channels 8 that of a box spar is particularly important for short press end plate 2 or the second row of channels 9 of the times that on the surface of an end plate 2 'and the bores 10 of the webs 3 Heating plate the same temperature at all points around the neutral level AB. For a particular rule, it may be necessary to have precise control of the temperature conditions in the four corners of the box spars; Etched box spar 27, a second secondary circuit heating plates or reinforced insulation is attached so that it is switched on either as a temperature, or equalization to the first secondary circuit under the

Another useful arrangement is the neutral level AB, in the first row of channels 8 of the

in that, in multi-opening presses, intermediate plates 10 have a single-row end plate 2 with the bores 10

are provided, which consists of two press plates and these of the webs 3 or in the second row of channels 9 of the

stiffening webs and optionally transverse two-row end plate 2 'with the bores 10

ribs exist, the press plates and the webs of the webs 3 or as a control heater in the first

with holes in one or more rows. Channel row 8 of the two-row end plate 2 '

are seen. In conjunction with severe, 15 acts. These heating points are connected via

Fixed and movable press bars can connect the supply line 19, 21 to the heating line 13 and with it

with the discharge lines 24, 26 to the return channel 16 also in the loose intermediate plates

existing large volumes of heat the pressing times of the second secondary circuit. The advantageous one

be reduced. Arrangement of two or more rows of channels in

In the following, exemplary embodiments of FIG. 10 will continue the heating plates of box spars 27

Invention described in more detail with reference to the drawing. even better if, according to FIGS. 8 to 12, two

It shows rows of channels through two opposing heating loops

F i g. 1 to 7 in a schematic representation, the two loops are connected in such a way that

heating possibilities of a box spar according to the selnd with the holes of the first and second

Invention, 25 row of channels are connected.

8 to 12 in a schematic representation. With this measure according to the invention Different heating options of two-row can both fast and even heating plates through two heating loops, and heating of the heating plates as well as for certain transverse

F i g. 13 shows in a schematic representation that overheating or underheating can be achieved of box spars according to the invention in light 30 den. An overheating of an edge cross-section is ter design as loose heating plates for a multi-z. B. achieved by the fact that the first two or three floor press. Drill holes in the first and second row of channels

The one heating loop shown schematically in Fig. 1 to 7 are directly next to each other, ie box spars 27 illustrate the heating without a hole in the second heating loop for the 35 designed as heating plates in between. Thus, this edge cross-section is flowed through first press and end plates 1 and 2, especially the highest temperatures, those with two rows of channels attached. But it is also possible. Web 3. The transverse ribs are marked with 4 and the pressing surface with 5, especially when the entrance of one of the two press plates 1 is machined flat, with 5 heating loops on the front rope and the entrance. The types of heating described refer to the other heating loop on the back angeordsich both on a movable press ram and net is that two heating channels are provided. The ones on a fixed press table. F i g is available under circulation. 8 to 12 show in a schematic representation when a heating medium with a certain the appropriate connection of the bores of two temperatures of a heat exchanger by means of 45 rows of channels of a press or end plate 1 and 2 circulation pump through a closed line for certain requirements,
The input of a heating loop is marked with an arrow valves, and directed back to the heat exchanger to the center of the input bore, where the bores to be heated and net, while an arrow from the center of the out channel rows in one or several working through-holes showing the output. the back of the heating plate can be seen

According to the Fi g. 1, 2 and 4 is the heating insulation that the arrows on the front side under the drilling

of the primary circuit from the heating line 11 via the tion and the arrows on the back side of the hole

Supply line 17 through the first row of channels 6 and over _{55 are} attached. The connection of the individual drilling

the discharge line 22 led to the return channel 14, wrestling are on the front with continuous

while in Figs. 3, 6 and 7 after the derivation lines that the back with interrupted

22 still the first row of channels 8 of the end plate 2 'lines drawn in and under the condition

The first secondary circuit is connected in series so that their connection is expedient run is expediently always carried out in the opposite direction to zuiv 60 within the plate

Primary circuit via the heating line 12, the additional options for connecting individual

line 18 and the discharge line 23 to the return channel bores by means of pipe bends outside of the

15 to the second row of channels 7 of the press plate 1 to plate are given. The easiest connection

closed. In parallel, two rows of channels are also supplied by means of two heating loops I-I

Via the supply and discharge lines 20 and 25, including 65 and Π-Π, FIG. 8 shows this arrangement the bores 10 of the webs 3 around the neutral plane results inevitably that the entrances of the two

AWAY. If there is no further secondary circuit, heating loops on the front and the exits

then supplies the first secondary circuit in parallel lying on the back.

The first heating loop I-I has its entrance in the first hole of the first row of channels, the z. B. is closest to the pressing surface, while the second Heating loop H-II in the first hole in the second row of channels begins. This statement applies to an odd number in the first and second, respectively Channel row of drilled holes. If, on the other hand, one takes an even number of bores for the rows of channels according to FIG. 9, it results that for Both heating loops the entrance is arranged in the first row of channels, which is better in terms of Heat supply to the first row of ducts is welcome, but it must be both on the front as. A heating line and a return duct must be available on the back of the heating plate. With the same Arrangement can meet an additional requirement according to FIG. 10, namely that the left edge side More heat can be supplied by drilling an odd number of holes in the rows of channels, in pairs counted, are connected so that the first two superimposed holes in addition to to be added to a heating loop. A heating loop has two more holes. In corresponding

By reversing the heating loops, the right side can also be supplied with more heat. The same thing applies to an even number of bores, also counted in pairs, according to FIG. 11, with the further arrangements gen again the F i g. 8 correspond.

12 again fulfills the requirements that both inputs are on the front and both outputs are on the rear, both edge cross-sections being supplied with more heat.

ίο If so far only the heating options of the Various arrangements have been described, what has been said naturally also applies to corresponding cooling. 13 shows a schematic representation an arrangement with intermediate plates 18 according to dei Invention in a lightweight design as loose intermediate plates for multi-daylight presses. In the cooperative with heavy, fixed and movable box holes 27, the pressing times can thus be reduced

«Ο be.

The intermediate plates 28 consist of two pressing plates 1 and these stiffening webs 29 to Transverse ribs 30.

For this purpose 10 sheets of drawings

Claims (1)

1 653 Patent claims: 1. Kelzplatte press, designed as a single or Multi-opening press, for the production of chipboard, razor boards, etc., with a fixed S. Press table and a movable press bar, which is designed as a box spar and can be heated as a whole and can be cooled back and each consists of a press plate, an end plate and a stiffening element Webs and transverse ribs exist, whereby the press plates and the closure plates for the passage of heating or cooling medium with rows of channels are verseben, characterized in that each of the webs (3), one or several rows of bores which are parallel and perpendicular to the press surface (10), and that the channel rows (6) of the press plates (1) to a primary circuit, the Bores (10) of the webs (3) on one or two secondary circuits and the rows of channels (8) of the ao Terminating plates (2) on the primary or a secondary circuit of the heating or cooling medium are connected. 2. hot plate press according to claim 1, characterized in that the press plates (1) and / or the end plates (20 of the box spars (27) have at least two rows of channels (6 and 7 or 8 and 9), which are arranged parallel to the pressing surface (5) in different planes and which are connected to the primary circuit or to one or both of the secondary circuits are. 3. hot plate press according to claims 1 and 2, characterized in that the heating circuits work in the opposite direction. 4. Heating plate press according to claims 1 to 3, characterized in that for heating the box spars (27) the bores of the first row of channels (6) of the press plate (1) adjacent to the press surface (5) have a primary circuit (11, 17, 22, 14) and the bores of the webs (3) facing second row of channels (7) of the press plate (1) parallel with the bores of the row of channels (8) of the end plate (2) and with two symmetrical to the neutral plane (AB) of the box spars Heating loops (18, 20, 25, 23) of the bores (10) of the webs (3) are connected in parallel to a secondary circuit (Fig. 1). 5. Heating plate press according to claims 1 to 3, characterized in that the first row of channels (6) of the press plate (1) forms a primary circuit (11, 17, 22, 14) for heating the box spars (27), while the second row of channels (7) the press plate (1) with a heating loop (12, 20, 25, 15) of the bores (10) of the webs (3) above the neutral plane (AB) in parallel to a first secondary circuit (12, 18, 23, 15) and the row of channels (8) of the end plate (2) with a heating loop (13, 21, 26, 16), also connected in parallel, of the web bores (10) below the neutral plane (AB) to a second secondary circuit (13, 19, 24 , 16) are summarized (Fig. 2). 6. hot plate press according to claims 1 to 3, characterized in that for heating the box spars (27) the first row of channels (6) of the press plate (1) and in series of the box spar 18 of the second channel grater (7) of the secondary circuit (ia, are, wöbe. ffl »% Ä are valid (Fig. 3). ^S 7 ^g heating press according to claims 1 to 3 S5 characterized in that for the BehSzmJTdeT box spars (27) the first channel S1) of the press plate (1) forms a Pnmarkreislauf S 17 22 14), while the second channel l lh aJ press lath (1) parallel to one SgESJiÄÄS parallel second heating loop of the Bohrunn \ Her Steee (3) under the neutral level 5 a first secondary circuit (12 18, and the first row of channels (8) leading to a second secondary circuit ^{are feet (F} 8 ^g hot plate press according to Claims 1 to 3, characterized in that the first channel and, in series connection, the second channel (7) of the pressure plate (1) have a primary V TfT (U Π 22 14) form that the first halls Ά) ukd Tn series connection the second KA (9 the conclusion ^ <g to -em 24 16) of a second secondary circuit summarized are (Fig. 5). 9 hot plate press according to claims 1 to 3, characterized in that for heating the box spars (27) the first Kana heater u _{d in series} scna i_ plate (20 a primary circuit (11, 17, 22 14) En while the second row of channels (7) of the pÄtE «with a parallel connected S Se (18, 20, 25, 23) of the drill, 10) hU Steee (3) over the neutral plane (AB) to Sem SS secondary circuit (U, ** <W and the second row of channels (9 ') of the final Xte (20 with a likewise parallel-connected etching loop (19, 21, 26, 24) of the holes ntn the Steee (3) under the neutral level ä ° i) to a second secondary circuit (13, 19 24 16) are combined (Flg. 6). 10 hot plate press according to claims 1 to 3, characterized in that for heating the cold bars (27) the first row of channels (6) of the press plate (1) in series with the first row of channels (8) of the end plate £ <) a primary circuit (11, 17, 22 14) form the second row of channels (7) of the press plate (1) in series with the second row of channels (9) of the end plate (2 ') to form a secondary circuit 3 4 barrel (12, 18, 23, 15) are connected and so much more heat energy is added to the circuit Secondary circuit each has a heating loop (12, 20, as it is due to the greatest radiation and 25, 15) of the bores (10) of the webs (3) v & rloren- and goes parallel under the neutral plane {A ~ B), is switched (Fig. 7). 5 19, hot plate press according to claims X 11. hot plate press according to claims 2 to 18, characterized in that on the four up to 10, characterized in that the two duct plates or reinforced insulation are additionally attached for the corners of the box spars (27) rows (6, 7) of the press plate (1) through two heating elements, loops (H, HH), each beginning at an edge w 20. Heating plate press according to claims 1 and alternating with the bores up to 19, characterized in that in the case of more of the first channel row (6) and the second channel tier presses intermediate plates (28) provided row (7) are connected, a primary circuit, which consists of two press plates (1) and these form O ⁷ Ig, 8 and 9). stiffening webs (29) and, if necessary, transverse 12. Heating plate press according to claims 2 ^l 5 ribs (30) besteben, wherein the pressing plates (I) and 3 and 6 to 10, characterized in that and the webs (29) with holes in one or for heating the box spars (27 ) which are provided with two more rows.
Rows of channels (8, 9) of the end plates (2 ') by two heating loops (I-I, II-II), each