SE460658B - PROVIDED TO REGULATE MATERIAL AND / OR MOISTURE CONTENTS IN A EXISTING LONG-TERM BODY CONSISTING OF FIBER MATERIALS - Google Patents

Description

460 658 In the said Swedish patent specification it is specifically stated that the matrix must be formed with a number of wall portions and that at least one of these wall portions is assigned a relative movement in relation to the member, with the relative movement directed in the longitudinal or production direction of the member.

It is previously known from U.S. Pat. No. 4,673,345 that in the case of a device, described in the above-mentioned Swedish patent, a drying plant operating by means of a high-frequency device is used as the heating device.

DESCRIPTION OF THE PRESENT INVENTION TECHNICAL PROBLEM Taking into account the prior art, as described above, and taking into account the instructions given to those skilled in the art in a study of these and in combination with normal technical knowledge, it must be considered a technical problem. that, in a device for the production of elongate members consisting of a fibrous material, it is possible in a simple manner to offer conditions for regulating the material and / or moisture content of the finished product and a specially qualified technical problem lies in the fact that with relatively small margins be able to keep the material and / or moisture content within predetermined limits.

Of an even more qualified kind is to be able to solve the technical problem of offering an opportunity to regulate the material content in a simple way in a simple way completely independent of or at least almost completely independent of the moisture content.

It is also a technical problem to be able to create conditions for a constant maintenance of the material content in the finished product and a constant maintenance of the moisture content in the finished product in the event of density variations in the starting material.

Taking into account the fact that the density of the elongate member produced constitutes a function of both the actual material and the current moisture content of 3,460 aces, i.e. one and the same total density for an elongated material produced can be obtained at different material and moisture contents, it is a prominent technical problem to be able to create conditions with simple insights to regulate the material and moisture content independently of each other against predetermined values.

It is furthermore a qualified technical consideration to realize in an manufacturing process, of the above nature, the advantage that the desired control, with a simple constant maintenance of the moisture content, is obtained by having only to vary the material content, in order to easily adapt the finished product. against a predetermined density applicable to both a predetermined material content and a predetermined moisture content.

It must then also be considered a technical consideration that in an above-mentioned manufacturing process it can easily create such conditions that the moisture content of the elongate body of the finished product is within predetermined limits and that therefore an increase or decrease in density is offered by only an increase or decrease in the material content, which advantageously takes place by changing the fiber content belonging to each measured quantity and which is determined by weight before introduction into the compression chamber.

It is also a technical consideration to be able to come to the realization that a desired increase or decrease in the moisture content of the finished product can not only be obtained by increasing or decreasing the moisture content in the quantities of the starting material but also the desired increase or decrease of the moisture content is obtained by regulating or regulating the delivered power for the drying plant or by reducing or increasing the residence time for the quantities in the drying plant.

It must also be considered a technically qualified consideration to realize that in the case of a drying plant operating at a medium frequency and in a certain application it can regulate the power to the drying plant only by changing the capacitance value of an additional capacitance connected in parallel across the electrodes 460 ace. displaceable plates arranged so that the power can be regulated by changing the distance between the two capacitor plates belonging to the additional capacitance.

It must also be considered a technically qualified consideration to realize that in the case of a high-frequency drying plant, the power to the drying plant can be regulated by lengthening or shortening a conductor connected between the electrodes and also have an opportunity to shift the voltage distribution and thus the drying power per length unit along the electrodes. In this case, a higher drying can be obtained at the beginning of the drying plant than at the end. Of course, within the framework of the possibilities is also the possibility of being able to regulate the power to the drying plant by changing the value of the alternating voltage connected to the electrodes.

THE SOLUTION The present invention now provides a way of being able to regulate the material and / or moisture content in one, e.g. fiber material, elongate member, where it is advantageous to compress a quantity of fiber material provided with moistened binder time and time again and let said true pressed quantities of fibrous material get Éorka by passing them between the electrodes for a high-frequency drying plant, in in accordance with what is previously known from the above-cited U.S. Patents.

According to the present invention, there is now provided an opportunity to effect an increase or decrease in the material content of the elongate member, and thus an increase or decrease in the density, by increasing or decreasing the fiber content of each new quantity supplied to the compression chamber. The invention also proposes that an increase or decrease of the moisture content of the finished product should be obtained by regulating down or up the power delivered to the drying plant and this can then be done by regulating down or up connected power to the drying plant and / or by regulating down or up the speed of the material quantity and thereby the residence time of the material quantity in the drying plant.

According to the present invention, it is indicated as a first alternative that the regulation of the power to the drying plant should be possible by changing the capacitance value of an additional capacitance connected in parallel across the electrodes. This can be done by changing the distance between two capacitor plates belonging to the additional capacitance.

As a second alternative, the power to the drying plant can be regulated by changing the length of a conductor connected between the electrodes. From this, the drying power per unit length and the distribution of the drying power along the electrode can also be changed.

The power supply to the drying plant can of course also be regulated exclusively by changing the value of the alternating voltage connected to the electrodes.

Via a weighing device, the weight of each of the quantities of fibrous material provided with moist binder is measured, and since the moisture content here is more or less unambiguously determined, this means that the material content is unambiguously determined against the measured weight.

The invention indicates that wood chips, in the form of sawdust or cutter chips, are chosen as the fibrous material, and water-based adhesive products are chosen as the binder.

It is further indicated that for a decreasing moisture content in the elongate member, the time is chosen larger between successive compressed quantities of fibrous material. 460 658 _ 5 * ADVANTAGES The advantages that can mainly be considered to be associated with a method, in accordance with the present invention, are that in this way conditions have been created for being able to easily adapt the material and / or moisture content in a finished elongate product. means, consisting of fibrous material in the form of wood material provided with dried and hardened binder at a predetermined value, where a separate regulation of material content and moisture content can take place in a simple manner.

What can primarily be considered as characterizing a method, in accordance with the present invention, is stated in the characterizing part of the appended claim 1. , BRIEF DESCRIPTION OF THE DRAWINGS A presently proposed embodiment of a device. operating in accordance with the method of the present invention, will now be described in more detail with reference to the accompanying drawing therein; figure 1 shows in side view and in strong simplification a previously known basic construction of a device, according to the present invention, for the production of an elongate member, figure 2 shows a section through a now proposed and at high frequency operating drying plant, used in the device according to figure 1, figure 3 shows in simplified form a technical coupling arrangement for the electrodes included in a high-frequency drying drying plant in order to be able to adapt the power output, and figure 4 shows a simplified wiring diagram for an electric device in the supply of an electrode heating device.

DESCRIPTION OF THE CURRENTLY FURNISHED EMBODIMENT FIGURE 1 thus shows in side view and in very strong simplification a device 1 for manufacturing an elongate member 4 in accordance with the present invention.

The prior art device shown in Figure 1 has a hydraulic cylinder 10 with associated piston and piston rod 9. This piston rod is forward and eats movable and cooperates with a compression member 8, in the form of a piston and which extends a distance into a compression chamber 7 and forms a part, namely a rear wall portion, for this compression chamber 7.

The compression scanner 7 is further delimited by a bottom part and two side portions as well as by the last compressed quantity.

Immediately above the compression chamber 7 there is a device 6. The device 6 can in its upper part be formed with a space for fibrous material and a space for moist binder, and by means of a mixing station not shown in the figure the fibrous material and binder are mixed together. in the agent in predetermined proportions and humidity and fed to a lower space 6a. From the lower space, via portioning devices not shown in the figure, a proportion or a quantity of the total fibrous material for the entire member 4 is fed into the compression chamber 7.

It is particularly suitable, however, to use a finished mixture of fibrous material and moist binder which is fed to the device 6 directly, where a quantity is evaluated via a weighing device and where a compression piston or filling piston presses a weighted quantity into the compression chamber 7 and thus forms the upper compression chamber 7. part. 460 658 8 In addition to the method of using a fiber suspension, mixed with binder, the elongate member can of course be formed by spraying or wetting a fibrous material with binder and especially in the latter case the material must be fed directly to the compression chamber 7 and there subjected to a print.

The material can be cutter chips, paper waste, plastic, sawdust and the like.

The compression member 8, in the form of a piston, is actuated by a hydraulic cylinder with associated piston and piston rod 9 to a reciprocating movement. The compression member 8 is shown in Figure 1 in side view and in a non-compressive and thus the compression chamber exposing position. When the compression means is in this position, the space in front of the compression means is filled with fibrous material from the device 6. This can be done by the compression means 8, in said displacement to the position shown in figure 1, exposing an opening and thereby ensuring that it the formed space or the compression chamber can be filled via a piston not shown in more detail in the figure. During the displacement of the compression member 8 to the right in Figure 1, the fibrous material or the portion 1 compresses the compression chamber against the previous already compressed portion to build on a new portion, intended to form the finished member 4. V During the displacement indicated above of the compression member 8, the filling piston is in its lower position.

Thus, successive proportions or quantities will be compressed in the compression chamber 7 and these are displaced as a unit, via a matrix, over to a heating section. There is nothing to prevent this heating section from also comprising the compression chamber 7 and this is especially true if the heating section uses a drying system operating by means of high frequency, as in that case only the electrodes are allowed to pass the compression chamber 7 and form a recess in the upper electrode. 658 adapted for the filling piston, used to introduce a new weighed quantity of fibrous material into the compression chamber 7.

The compressed fibrous material provided with moist binder is now introduced into the heat section and subjected there to a heat treatment by means of high frequency, after which the finished dried elongate member 4 can be discharged via a portion 5b. The finished body has here been given the reference designation 4.

The member 4 may also be desired to be transferred directly to a treatment plant 3, in which the outer surface of the member can be coated with impregnating liquid, paint, varnish or the like.

Furthermore, Figure 1 illustrates with the reference numeral 2, a control member, through which a temporal activation of the reciprocating movement of the compression member 8 can take place. Furthermore, a material and binder as well as the volume proportioning device of the individual quantities are controlled, and the fibrous material containing the device 6 and associated pressing means and other functions for operating the device 1. The specific electrical connection applicable to the control means 2 is not described, since its construction can be easily produced on the basis of the functional description that follows.

According to the present invention, the control means 2 also comprise necessary electrical connections in order to be able to operate a high-frequency drying plant.

Referring to Figure 2, there is shown a section through the high frequency dryer 5 in accordance with the present invention.

Figure 2 shows the orientation of the elongate member 4 consisting of fibrous material and adhesive, which passes through a matrix, the upper surface of which is constituted by one electrode-12 for the high-frequency plant, while the lower surface is constituted by the other, the grounded, electrode 13 for said high-frequency plant. . 460 658 The two side surfaces of the matrix are formed by two rods 14, 15 consisting of glass composite material and these pass in between the electrodes 12, 13.

According to the present invention it is now indicated that one electrode 12, but preferably both electrodes 12, 13, cooperate with one or more electrode heating devices 16, where four such devices 16 are arranged to cooperate with the upper electrode and four similar devices are arranged to cooperate. with the lower electrode 13.

These electrode heating means are adapted to be able to assign not only the electrodes 12, 13 but also these electrodes 12, 13 surrounding details before the start of the manufacturing process for the elongate member 4, such as the rods 14, 15 and rods 17, 18, but also other details such as an upper cover plate, such a temperature as to prevent water condensation of the water vapor generated on cold surfaces.

In this context, it can be mentioned that already at the start of the drying plant, water vapor is generated during the drying of the quantities of fibrous material-binders. This water vapor normally rises upwards and if it is condensed out on cold surfaces, conditions are created for electrical discharges.

This especially applies to the electrode and the environment of the electrode that is not system grounded.

It is further proposed that air laden with water vapor should be sucked via a nozzle 19 from a space enclosed by the electrodes 12, 13 and the rods 14 and 15 but also a space 20 enclosing the electrodes. The space 20 communicates with the socket 19 via openings 21.

Preferably, the extracted air volume is adapted, via a fan device not shown in the figure, so that the air volume per unit time will be selected to connect to or substantially connect to water vapor generated in the drying plant. In particular, if extracted air volume is chosen to exceed the volume of water vapor generated, special consideration should be given to allowing only an insignificant amount of air to pass in through the feed side Sa, so that wall portions there are not subjected to cooling.

An amount of air that is allowed to pass in through the discharge side Sb also cools it and should be avoided.

In order to ensure sufficient heat at the feed side Sa, it can also be proposed that hot air be directed towards the compression chamber 7 and existing parts therein. In this case, the extracted air volume should increase so that the hot air passes into the matrix and around the matrix and the electrodes.

The present invention further discloses that the lower electrode connected to the system ground or the lower electrode 13 is fixedly connected via electrically insulating glass composite rods 18 to a lower plate 22 which is connected to the piston 8 and which thereby directly follows the displacement movement of the piston 8.

The glass composite material rod 14 is fixedly connected to a plate 23 and the glass composite material rod 15 is also fixedly connected to a plate 24 and these are slidably arranged by hydraulic pistons (not shown in the figure), corresponding to the reference numeral 9, 10. The upper electrode 12 is via similar glass composite material consisting of rods 17 fixedly connected to a plate 25.

The plates 22, 23, 24 and 25 consist of electrically conductive material. above the upper plate 25 there is a heat-insulating material 26 and above it there is a space 27, intended to conduct air vapor-laden air out through a socket 19.

The plates or parts 22, 23, 24 and 25 are coated on the inside with a copper layer for shielding the electromagnetic field. Since a certain relative movement will take place between the part 22 and the parts 23 and 24, and between the parts 23 and 24 and the part 25 there is between the parts 22 and 23 resp. 24 copper rails 30, 31 and between the part 25 and the parts 23 and 24 copper rails 32, 33.

The designated glass composite material consists of a material marketed under the trademark "ARCLEX".

With reference to Figure 3, the reference numeral 36 illustrates the connection of the energy supply to the high-frequency drying plant and when it is connected to the upper electrode 12, which is connected via a connection 37 to the lower electrode 13, which in turn is via a line connected to system ground 38.

In addition, a plate 34 and a plate 35 are electrically connected to the electrodes 12 and 13, forming a capacitor and where the capacitance value of the capacitor can be varied by varying the distance "d" between these plates. This can most easily be done by allowing the plate 34 to be slidably arranged along a guide towards and from the plate 35.

By adjusting the distance "d", it becomes possible to tune the high-frequency circuit to pre-desired operating conditions.

For some applications an adaptation may be required which is not dependent on the plates 34 and 35 but uses different lengths for the connection 37.

With only one or both adjustment possibilities, the voltage distribution and thus the drying effect along individual longitudinal sections of the electrodes 12 and 13 can be changed and moved.

Referring to Figure 4, there is shown a circuit diagram of an electrical energy supply to the heating device 16, where this energy supply takes place across an inductance 40, 41 and with four capacitors 42 and 42a, 43 and 43a 'connected to system ground 38 for the high frequency system. This connection '\ \ __: _ f .. .__ v 73 ... i -. _. , ._ _,. \ __ i 1 :; : I _ __ I. x 'I f är¿av§edd föP ~ to reduce the voltage generation that takes place in the device 16 out of d the high frequency power supply and of the connection cables. The capacitances are intended Ä / to dammoa'induced voltage peaks. "_ \ ', X V; ._ l .l \ x * _ ~ 1Frânffigur'2 (it appears that the number, four pieces, heating device 16 is, Q located between e' ktfisk insulating glass como material 17 and each: ¿::: ___ one of these ärkmífäáívia via a circuit shown in Figure 4. ä _ The electro-energy supply to the devices 16 located adjacent to the lower. '~~ ffe] ektroden'I3 can take place directly, without coupling according to Fig. 4, since the electrodehw13 is connected to the system ground 38. The respective means is here arranged to be enclosed by a shielded tube which is arranged to extend out of the electromagnetic field. _ v; 'f' _ '~ [su However, it should be noted here that the device 16 must be completely placed in a cutting tube, a copper tube, which is guided'he1t ~ through the electromagnetic! II d' faieer. _ii * -_ ~ "i ï 5 __;»., .... |. f '- I 1: _ í'. _ I - f A temperature-not shown thermostat'föreiinns also shown in figure. fl \ 4. '^. \> _ «Connected t The upper surface of the electrode I2 and this thermostat are sensed, in the manner indicated by I in and in Fig. Å, over an inductance and by means of "¿f" f_att antalukaöäcitances. ._ "ß _ __ vf. _É f * Å '_ i“ av _. 3, _ _. I Å / I I. I b I -. .. \ .f á ¿_¿u: N; f' As previously mentioned, the electrode electrode should follow the motion. The relative displacement between the stationary electrode 12 and the side walls 1: 15 and the relative displacement between the moving electrode 13 and the electrode 13 should be. so adapted that a K-: sufficient friction is formed therefrom to connect the individual fibrous material quantities- \ ¿¿j - .. ï? * for en.ko] v ^ 8, intended to weld together, with moist, b} n9? @edel Quantity of fibrous material-while the two side walls, of an electrically insulating material, are arranged to be simultaneously * fi desired approximately z * half namely fl êê movement! _ '“K d f'_' Åetåïg 460 658 Figure 2 further shows that first rods 14, 15 formed of glass composite material are arranged to abut along two opposing sides of the member 4 against the compressed quantities of o. and one or more other rods 17, 18 formed of glass composite material are arranged to abut and support the electrodes 12, 13 along two opposite sides.

The electrodes and rods extend from the compression member 7 to the end portion Sb. Although the exemplary embodiment is illustrated so that the compression chamber 7 is located within the drying plant 5 by designing the upper electrode 12 with a recess for receiving the fibrous material-binder mixture, the embodiment also falls within the scope of the invention that the compression chamber is separate and arranged at a distance from the drying plant .

The latter embodiment can be expected to provide somewhat simplified measures at the drying plant.

The present invention now primarily relates to a way of being able to regulate the material and / or moisture content in one, of e.g. fibrous material consisting of elongate member 4, where a quantity of moist material provided with moist binder is compressed time and time again and said fibrous materials compressed in the compression chamber 7 are allowed to dry by passing them between the electrodes 12, 13 for a or by means of the high-frequency operating drying plant 5.

According to the invention, it is proposed that an increase or decrease of the material content in the elongate member 4 is obtained by increasing or decreasing the proportion of fiber in each quantity supplied to the compression chamber 7.

An increase or decrease in the moisture content can be obtained by regulating down or regulating the delivered power for the drying plant.

The control of the power to the drying plant 5 takes place in a first application by changing the capacitance, for an additional capacitor connected in parallel across the electrodes 460 aces by changing the distance "d" between two capacitor plates 34, 35 belonging to this additional capacitor.

In a second application, an adjustment and power energy regulation can take place by lengthening or shortening the connection line 37.

This is done with constant voltage.

The power of the dryer can of course also be regulated by changing the value of the high-frequency alternating voltage connected to the electrodes via the connection 36.

Via a weighing device, included in part 6, the weight of each of the quantities of fibrous material to be bound to be supplied to the compression chamber 7 and where the moisture content of the fibrous material and the moisture supply via used adhesive products are predetermined.

As an alternative to increasing or decreasing the moisture content of the manufactured product, the time can be chosen smaller or larger between successive compressed quantities of fibrous material, so that the material has a longer or shorter residence time in the drying plant 5.

It is assumed that the time required to feed a quantity of fiber to the compression chamber 7 and to compress this quantity of fiber therein is unambiguously determined by the control means 2 and that it therefore becomes easy to control the time between successive compressed quantities of fibrous material.

The invention is of course not limited to the above-mentioned embodiment but may undergo modifications within the scope of the inventive concept illustrated in the appended claims.

Claims (6)

w, 460 658 PATENT REQUIREMENTS 1. Ways to regulate material and / or moisture content in one, by e.g. elongate member comprising a quantity of a mixed fibrous material provided with moisture-containing binder and said compressed quantity is allowed to dry by passing it between the electrodes belonging to a high-frequency drying plant, characterized in that a increase or decrease in the nutrient content of the finished elongate member is obtained by increasing or decreasing the fiber content included in resp. quantity, that an increase or a decrease in the moisture content is obtained either by regulating down or up the power given to the drying plant and / or by regulating up or down resp. quantity uptime in the drying plant, that a regulation of the power to the drying plant takes place by changing the capacitance value of an additional capacitance connected in parallel across the electrodes and / or that a regulation of the power to the drying plant takes place by changing the length of one connected between the electrodes conductor, whereby the length of the conductor is selected to regulate the drying power per unit length and the distribution of the drying power along the electrode. in 2. A method according to claim 1, characterized in that the regulation takes place by changing the distance between two capacitor plates belonging to an additional capacitance. 3. A method according to claim 1, or 2, characterized in that the regulation of the power to the drying plant takes place by changing the value of the alternating voltage connected to the electrodes. 4. A method according to claim 1, characterized in that the weight of each of the quantities of fibrous material provided with binder is measured via a weighing device. 5. A method according to claim 1, characterized in that wood chips are chosen as the fibrous material, in the form of sawdust or cutter chips, and water-based adhesive products are chosen as the binder. ß \ ï '460 658 - 6. A method according to claim 1, characterized in that for a decreasing moisture content in the elongate member, the time is weighted larger between successive compressed quantities of fibrous material.