DE4415698A1 - Moulded packaging bodies - Google Patents

Abstract

To produce shaped bodies such as for packaging or pallets and the like, from fibre material and especially used paper or cardboard, two mould sections (F1,F2) with flat surfaces or fitting into each other match the dimensions and shape of the shaped body (F). They remain while wet at the suction moulds (2,2') and are pressed together by suction and/or pressure. They are taken together from the suction moulds (2,2') and dried. Also claimed is an appts. where the suction moulds (2,2') form at least one pair of suction moulds (P) with relative movement in a common immersion vessel (5), with their suction surfaces (6) against each other. At least one suction mould (2,2') is fitted with a system (14) to give alternating suction and pressure.

Description

The invention relates to a method and a device for the production of moldings, such as packaging Pieces, pallets or the like made of fiber material, in particular from shredded waste paper and / or Cardboard waste, which is in a flood more or less dissolved fiber raw material in the Flood immersed in suction forms, ver strengthened, lifted off the suction mold and the fittings then be dried.

Such a method has long been BE knows and is also in connection with a device used for example according to DE-GM 9 33 468. Regarding the Fittings themselves should be referred to, for example DE-GM 87 14 602, US-PS 3 135 450 and DE-GM 92 04 795, in which the latter case the fitting, the rough surfaces after point inside, with one made in the same way shape-matching cap can be covered.

Finally, according to EP-PS 921 056 670 it is known the two fittings for packaging containers form as a hollow body, the interior with a flat cover shell made of the same material is closed, the flat, smooth sides each molded body and the associated cover shells the In  Form the inner and outer surfaces of the container and the rough ones Surfaces of the moldings and the cover shells in the interior spaces of the moldings are directed. The two a form Piece-forming shells are either simply too put together, but can also be glued together become, d. i.e., greater than 4 to 6 mm wall thicknesses here thus achieved by practically two se produces separate fittings and assembles them, whereby however, a composite of the two shells does not he which, as I said, can only be reached by gluing can be enough.

The invention has for its object a method and to provide a device for its implementation, with which fittings with double wall thickness result, which also consist of two shells, which Shells, however, form a solid material composite.

This task is with a method of the generic type Art solved according to the invention in that two even or two nested, correspondingly dimensioned nated and shaped, forming the fitting parts remaining on their suction molds, when wet put together and by suction and / or pressure with connected together, apart from the suction forms ben and then dried.

With this method, separate moldings are also made Made in a known manner, but is essential here  in that the fittings after their suction Suction forms are not lifted and dried, son other, remaining on them, in the wet state with theirs rough surfaces brought into mutual contact and un ter pressure, which is simultaneously with a Coarse drainage and fiber or pulp entanglement ver is bound to a largely uniform in itself Material composite leads, which then altogether from the suction shapes are lifted off and dried. Most of all, this is for molded articles of interest that have a higher wall thickness and require greater stability, such as must be required if one of such fittings Want to use as pallets that like has shown itself to be very easy to moderate Loads are suitable.

Since the molded parts to form a fitting in would be manufactured in a conventional manner, would in principle nothing opposed to it, as was the case with the individual moldings of their suction forms and in a special pre direction to press together and to be able to drain or to remove the one molded part and on or in the other remaining on its suction form Use molded part, which is a rational Ferti contradiction.

For this reason it is necessary to carry out the procedure provided a device consisting, as before, of a pulp tank with immersible in it  Ren suction molds, fitting storage surface and attached to it closed drying section, but according to the invention the suction forms of at least one pair of suction forms on one common immersion holder movable relative to each other stored and the suction molds with their suction surfaces against are facing each other.

The two suction forms are off during the suction process sufficiently far apart to be sufficient Chips or fiber supply to the suction surfaces guarantee. After completing the suction process both suction forms by means of their suction mold holder from the Flood lifted out and moved together, whereby For example, the suction pressure of the upper mold to the pressure vice versa switches on and the suction pressure on the lower mold Maintain or turn on again to the Ent cause watering and entanglement. After that the pressure on the upper suction mold is switched again, and the molds are moved apart, the finished, formed from two moldings due to the lying suction pressure adheres to the upper suction form. Well more is between the two separated suction form a storage surface retracted to via baling pressure to release the finished fitting and on the support surface as well as the drying section in a suitable manner feed. This whole process, the other way around can be carried out with respect to the suction forms, d. h., Ver stick the finished fitting to the lower suction mold, is advantageous largely with appropriate Vorrich  design of an automation accessible, and it fittings are created, regardless of whether they are for ver packaging purposes or for example pallets. The against About twice as much over previously manufactured fittings Moldings with wall thickness have all sides outwardly "smooth" surfaces with fine sieve structure on, which comes from the suction surfaces of the suction mold.

According to EP-PS 05 043 311 it is known in suction form tool at least one other, smaller suction mold stuff to keep away and this smaller suction form tool simultaneously with the other larger suction unit to put stuff under suction and thereby the two ent standing fittings to form a coherent fitting to train. However, this procedure only serves to reinforce a fitting in certain small areas ken and is here for the production of fittings type of interest, i.e. with the same and Double wall thickness is not suitable because the two forms of suction with respect to a sufficient Obstruct the supply of chips or pulp would. In the present case, they are created during suction initially independent fittings, the first after completion of the suction process, as described together be brought.

The inventive method and the advantageous to device intended for its implementation Lich advantageous in this regard  below based on the graphic representation of Exemplary embodiments explained in more detail.

It shows schematically

Figure 1 in perspective and in section a finished molding.

Fig. 2, 3 in perspective and in section, the suction molds required for the produc- tion of the molding according to Fig. 1;

Fig. 4 greatly enlarges a section through the mold piece wall and

Fig. 5 highly schematic and in section the Vorrich device for performing the method.

The shape of the shaped piece F shown in FIG. 1 is chosen as simple as possible and is not to be regarded as binding, ie the shaped piece F can also have, for example, the shape and size of a pallet with molded support feet, recessed profiles or the like. Also shape and size of the recess profile 8 shown on the molded part F₁ is chosen arbitrarily. It is essential that compared to the layer structure in the molded part F, as shown in Fig. 4 greatly enlarged, which shows that the two molded piece parts F₁, F₂ in the area of their "neutral" connec tion level 10 through each other by the suction and / or pressing process "Interlocking" of the fiber or pulp parts 11 are connected to one another and can only be separated from one another by force, if at all.

The suction molds 2 , 2 ', that is, their suction surfaces 6 , starting from the shape shown, for example, so ausgebil det that the formed part F₂ after completion of the suction process fits into the formed part F₁, that is, with their rough surfaces 12 against each other can be brought to the plant. The "smooth", the sieve structure surfaces of the fittings F₁, F₂ are denoted by 13 . It is possible, as is indicated schematically in Fig. 1, to add stability with contributing, net or grid-shaped intermediate layers 9 before joining the two molded parts F 1, F 2. If there are special requirements with regard to increased load-bearing capacity, which can be possible, for example, when training as pallets, then massive and cross-section-adapted stiffening inserts (not shown) made of suitable material can be inserted into the indentation profiles 8 , and it would even be possible after during the drying process, inject suitable plastic, for example.

With regard to the implementation of the method and the device particularly suitable therefor, reference is made to FIG. 5, according to which this consists in a known manner of egg nem pulp suspension tank 1 with suction molds 2 , 2 ′, mold storage area 3 and drying section 4 connected to it , in which it is a more or less long drying tunnel with appropriate conveyors.

The above-described suction molds 2 , 2 'of a pair of suction molds P are movably mounted on a common immersion holder 5 relative to one another and are directed towards one another with their suction surfaces 6 . The suction molding of the fitting parts F₁, F₂ takes place in the sufficiently distant position of the suction molds 2 , 2 ', because only this guarantees a sufficient fiber or chip inflow to the suction surfaces 6 from the fiber swell AS according to FIG. 5.

After Saugausformung the fitting parts of the entire immersion holder 5 is lifted out of the Faseraufschwemmung AS forth and the two suction molds 2, 2 'are, if necessary with insertion to sammengefahren close an intermediate layer 9 and / or stabilization render deposits in Eintiefungsprofilierungen 8, wherein suitably at the lower suction form 2 'the suction pressure is maintained and the upper suction form 2 is switched to the pressing pressure, for which the device, as strongly indicated in Fig. 5, has suitable devices 14 for pressure switching.

After completion of this connection process of the two mold parts F₁, F₂, the upper suction mold 2 is switched back to suction pressure, and the pressing pressure on the lower suction mold 2 'is switched off, so that when the two suction molds 2 , 2 ' move apart, the finished and still moist molding F is on the upper suction mold 2 sticks. When the shaped piece storage area 3 is moved under, the shaped piece F is then blown off, for example with a short pressure surge, falls on the storage area 3 and is introduced into the drying section 4 in a suitable manner. The device is shown without any drive and Bewegungsele elements, since these are purely structural conditions, which in their special training also depend on the extent to which the whole process should run automatically or whether, in contrast to the description, the finished fitting is to be removed from the lower suction mold 2 '.

Claims (6)

1. Process for the production of moldings, such as packaging moldings, pallets or the like, made of fiber material, in particular of waste paper and / or cardboard waste comminuted to shred size, in which the more or less dissolved raw fiber material rial is immersed in the suspension Suction molds ( 2 , 2 ') sucked in, solidified, removed from the suction mold and the fittings (F) are subsequently dried, characterized in that two flat or two mutually interlocking, dimensioned and shaped accordingly, the fitting (F) forming fitting parts (F₁, F₂) on their suction forms ( 2 , 2 ') remaining, put together in the wet state and connected by suction and / or pressing pressure, lifted together from the suction forms ( 2 , 2 ') and finally dried. 2. The method according to claim 1, characterized in that for forming cavities ( 7 ) between the at the molded parts (F₁, F₂) at least one with a deepening profiles ( 8 ) is used. 3. The method according to claim 2, characterized in that the at least one cavity ( 7 ) between the molded piece parts (F₁, F₂) is foamed after drying with stiffening plastic. 4. The method according to any one of claims 1 to 3, characterized in that before the joining of the two molded parts (F₁, F₂) a net or grid-shaped intermediate layer ( 9 ) between the two molded parts (F₁, F₂) is inserted. 5. Apparatus for carrying out the method according to claim 1, consisting of a fiber suspension tank ( 1 ) with immersible suction molds ( 2 , 2 '), molded-piece storage surface ( 3 ) and connected drying section ( 4 ), characterized in that the suction molds ( 2 , 2 ') at least one pair of suction molds (P) mounted on a common immersion holder ( 5 ) so as to be movable relative to one another and the suction molds ( 2 , 2 ') with their suction surfaces ( 6 ) are directed towards one another. 6. The device according to claim 5, characterized in that at least one of the suction molds ( 2 , 2 ') is equipped with a directions ( 14 ) for changing suction pressure to pressing pressure.