DE1104165B - Method and device for producing the blanks for the production of multi-layer single or multi-layer panels from wood chips od. - Google Patents

Description

The production of the blanks for the production of multi-layer single and multi-layer panels Wood chips or similar pourable material has so far mostly been done in with stationary hopper equipped systems in such a way that a band-shaped base in a continuously forward direction of movement guided along under the bulk hoppers arranged in a row one behind the other will. The stream of material exiting from each hopper brings to the continuously moving one Place one fill at a time. A multi-layer blank comes about that from the individual hoppers different material and / or different amounts of material per unit of time emanate.

Another known method works with a stationary sheet metal base and can be moved over it arranged. Bulking machines that change the direction of movement once or several times be moved back and forth over the base and the chips flow onto the base permit. By moving the bulk machines belonging to a set forwards and backwards in relation to the stationary ones Underlay, multi-layer blanks can also be produced using this method.

The first-mentioned method only results in panels or chipboard of uniform thickness and uniformity Basis weight and satisfactory composition if a relatively large number of hoppers is provided. Such a system is on the one hand expensive and takes up a lot of space Claim. On the other hand, systems with moving bulk machines require an expensive, fault-prone drive and control device. The one for moving the heavy bulk machines back and forth Required driving force has an adverse effect on high running operating costs, and the capacity such a system is limited by the fact that the chip material to be processed cannot continuously be fed to the funnels of the bulk machines, rather the system temporarily must be shut down in order to refill the bulk machines with chip material.

The invention is based on the object of the method for producing the blanks for To make the production of multi-layer single or multi-layer boards, in particular chipboard, more efficient, so that the blanks can be produced cheaper, but still have all the advantageous properties that are desired and necessary for the production of high-quality panels. With the simplification of the manufacturing process is still aimed at reducing the investment costs for the plant and reduce ongoing operating costs.

Method and device

for producing the blanks

for the production of multi-layer single

or multilayer boards

from wood chips or the like.

Applicant:

Hildesheim machine factory

Behrens & Co. G.m.b.H.,

Hildesheim

According to the method according to the invention, these goals are used in the case of the stationary bulk hopper come, achieved in that as a pouring pad in a known manner several in Tandem arrangement of individual documents lined up one behind the other are used and this multi-part document series by a conveyor line corresponding to the uniform length of the individual documents in Pilgrim step funding with at least two forward and at least one reverse movement on the molding line under the bulk hoppers, which are separated from each other by this conveyor line be led by.

Since all individual documents are guided back and forth several times under each funnel, it is a very ensures uniform pouring, which is advantageous in improving the quality of the finished plate affects and the plate an extremely good stamina and increased transverse, tensile and Gives flexural strength. Since the method according to the invention can be carried out with fixed bulk hoppers and the funnel is only in one of the number of layers that the finished plate should have, corresponding must be present in a small number, the result is a simple one without requiring much effort operating system in which the chip material is continuously fed to the stationary discharge devices can. So there are no downtimes, and the capacity of the system can be used to the full.

109 539/493

Claims (3)

According to a further proposal of the invention, the continuous mode of operation can advantageously be implemented in such a way that the individual document arriving at the end of the molding line with the finished blank is pushed off after the last forward movement has ended and at the beginning of the molding line shortly before the end of the work cycle when changing from the return movement to the forward movement an empty individual document is attached to the row of documents. Here, by using automatically switching connection conveyors of known design, it is easily possible to carry out a fully automatic mode of operation, the time required for pre-pressing the blanks leaving sufficient time for the pouring processes. The invention is explained in more detail below with reference to the drawing, which shows the individual work phases in the production of a blank according to FIG. 2 in a schematic representation in FIG. In the illustrated embodiment, three hoppers av a2, αΆ are provided, from which continuously pourable material, such as wood chips or other machined, frayed or chipped material emerges, which is used to produce the panels or chipboard. The material flow from the funnel at pours the lower cover layer bv the material flow from the funnel a.2 the thicker middle layer b2 and the material flow from the funnel a3 the upper cover layer b3 of the blank b onto individual supports c, which can consist of sheet metal, for example. The conveying path of the individual documents c runs via the loading line d, the forming line / and the delivery line g. Each of these streets consists of a conveyor, for example an endless belt conveyor or a roller table. The conveyor of the forming line f is driven so that the bulk documents c forward by a distance corresponding to the length of the individual documents, then backward by the same conveyor distance and then forward again in the direction of the arrow χ drawn in FIG remote hoppers av a2, a3 are guided back and forth. In this three-stage work cycle, the bulk material is poured in three layers from each hopper onto the base c, which is moved back and forth under it. If you want to produce blanks b in which each layer bv bs, bs consists of more than three layers, the work cycle must be set up accordingly, for example by performing three forward movements and two backward movements or four forward movements and three backward movements. At the end of each work cycle, the document c or the row of documents is pushed on by a distance that is the same as the pitch in which the documents c are placed on the conveyor of the forming line f. The manufacturing process begins, as can be seen in FIG. 1 above, that a delimitation box h or delimitation frame, a single support c and again a delimitation box h or delimitation frame are pushed onto the conveying means of the molding line / from the feed line d. The boxes h or frames are used in a known manner to delimit the bulk layers on both end faces and to collect or divert the bulk material falling between two consecutive documents c. After the end of the working cycle, which consists of three strokes with two forward and one reverse movement, a three-layer bulk layer, the lower cover layer bv, has arisen on the first base c. During the next working cycle, three layers of the thicker middle layer b2 are poured onto the three-layer bulk layer ^ 1 of the first base c from the bulk hopper a2. At the same time, the second pad, which is pushed up from the feed line d against the rear boundary box h or the boundary frame of the first pad c on the molding line / at the moment in which the first pad c after the end of the return movement is the last forward movement of the the first work cycle has started and to which in turn a boundary box h or boundary frame is attached, the first layer of the lower three-layer bed is applied to form the lower cover layer bt. In the illustrated embodiment, after a third individual document c is connected to the previous two individual documents in the manner described above, there are always three individual documents on the molding line /, and these three documents, lined up in tandem, are simultaneously and gradually charged with bulk material according to the invention. The result is a blank b for a nine-layer three-layer chipboard, a short piece of which is shown enlarged in cross section in FIG. 2. By arranging fewer or more than three pouring devices av a2, a3 and by changing the work cycle of the molding line / it is easily possible without great inconvenience to use the device for the production of blanks b for the production of single or multi-layer panels with any odd number of layers to set up in the individual layers. When the first substrate c has arrived at the delivery line g and the work cycle has ended, all of the bulk layers of the upper cover layer b3 have been completed. The pad c is then pushed over with the delimitation box h or delimitation frame located on its front end face on the conveying means of the delivery line g and a point for further processing of the blank, eg. B. a press, forwarded. During operation, after the end of each work cycle of the molding line / an individual document c with a finished blank b is pushed over onto the delivery line g, and at the same time when changing from the backfeed to the last feed movement of each work cycle, an empty document c with a bounding box h or bounding frame is created from the conveyor of the feed line d to the conveyor of the molding line / pushed. The drives of the connecting conveyors d, g are controlled by means of appropriate devices, for example by electrical means, so that they only rotate temporarily, as is the case for bringing in an empty pad c with delimitation box h or limitation box and for removing a pad c with finished Blank b and the front delimitation box h or bounding frame is necessary. The conveyor of the molding line f works continuously in constant change with at least three running movements, namely with at least two forward and at least one return movement. _ ■; ■: · ■■> Patent claims: 1. Method of making the blanks for the production of multi- layer single or multi- layer panels from wood chips or the like 1 1U4 IDO pourable material that comes from solid hoppers preferably in uninterrupted flow is applied to a base moved along under the funnels, characterized in that that several individual documents lined up one behind the other in tandem as a pouring base are used and this multi-part row of documents by one of the uniform length of the Individual documents corresponding conveying route in pilgrimage support with at least twice Forward and at least one return movement on the molding line under the respective around this conveyor line distant bulk hoppers are passed. 2. The method according to claim 1, characterized in that the arriving at the end of the molding line Individual document with the finished blank after the last forward movement has ended automatically pushed off and at the beginning of the forming line shortly before the end of the work cycle when changing from the return movement an empty individual document is automatically connected to the row of documents for the forward movement will. 3. Apparatus for carrying out the method according to claim 1, characterized in that for the pilgrim step promotion of the row of documents on the molding line (F) below the hopper (a _v a ₂ , a ₃ ) separated from each other by the length of the individual documents (c) alternately to forward and reverse automatically switchable conveyor, for example an endless belt, a roller table or the like. Is provided and at the front end of the molding line a table or a conveyor (rf) for feeding the individual document to be connected to the row of documents and on At the rear end of the molding line a table or conveyor (g ·) for the removal of the individual document to be dispensed with the finished blank (b) is arranged. Considered publications:
Austrian patent specification No. 188 495. 1 sheet of drawings