FI68581B - FOERFARANDE FOER FRAMSTAELLNING AV TRANSPORTBEHAOLLARE - Google Patents

Description

68581

METHOD OF MANUFACTURING A TRANSPORT TANK - FÖRFARANDE FÖR FRAMSTÄLLNING AV TRANSPORTBEHÄLLARE

The present invention relates to a method of manufacturing a so-called container of a transport container, which base container comprises a base and a container connected to its upper side, which is specially intended for transporting and storing bulk goods such as plastic granules or the like.

The containers referred to in the invention have been utilized as disposable containers, i. they are not returned or reused.

It is therefore obvious that such containers must be as cheap as possible to manufacture and, in addition, durable enough not to break under the stresses to which they are subjected during use. It should be noted that the stresses are relatively high because such containers, when used frequently, contain an actual weight of 1000 kg.

The substrate used in such vessels is a normal four-way vessel, i. the chassis has openings on four sides for easy access to the forks of the forklift truck from all sides. Until now, the so-called Euroa1us, i.e. the bases consist of two wooden pallets with intermediate beams. Container tanks or barrels are usually made of double-sided corrugated corrugated cardboard. This is a relatively expensive and hard material, but it has certain limitations with respect to the possible shape of the container. Double-sided corrugated corrugated board cannot be formed along a curved line, but must be bent and broken along straight lines. The containers used so far have therefore been multi-sided, e.g. octagonal, so-called "octabins". However, such slotted containers are not very desirable for manufacture or use. Corrugated corrugated boards on both sides must be stored in straight sheets, then cut into the correct shape, and then bent and fastened together with staples to form a multi-shaped container. There are also difficulties in making a base and lid for such a container, as well as attaching such containers to the base. All in all, when such large containers are filled, for example 68581 plastic granules, radial forces are generated to a considerable extent, which tend to point against the walls and straighten the walls in the polygonal container.

It is an object of the present invention to provide a method for manufacturing a base tank, in which the above disadvantages are avoided, which base tank is inexpensive, efficient and practical to use, has a desired shape in terms of force distribution, more moisture resistant than previously used tanks of this type. and having a large thermal insulation capacity.

To achieve this, a method of manufacturing an equalizer according to the invention, which substrate container comprises a substrate and a container attached to its upper side, and which is specifically intended for transporting and storing bulk material such as plastic granules or the like, is characterized in that the finished pedestal has a round or a substantially round neck connected to an end surface at the end of a winding mandrel having a diameter substantially equal to the diameter of the neck, the single-sided corrugated board being twisted several turns around the neck of the mandrel and the base so that the turns are glued to each other and glued together.

An improvement in the method of the invention is characterized in that a waterproof bag of a suitable material, e.g. plastic, is pulled over the mandrel before the base is attached to the end of the mandrel, whereby the twisted shell is glued to the bag.

beginning the container according to the invention is cheap to manufacture, because it can be used very simple and käämintätyöka1ua container shell is made simply by winding, e.g. aa 1lotetusta the other side (single-sided) made from corrugated cardboard which is covered with an adhesive, wherein aa 1topahvikerrokset thus become bonded to each other and the base of the neck. Thus, the use of bulk material is avoided, which would necessarily lead to discontinuous fabrication, as is the case with multi-shaped containers made of corrugated corrugated board on both sides. By making the substrate 3,68581 of expanded polystyrene with closed surfaces, a watertight substrate is obtained, which effectively protects against the ingress of moisture through the substrate if such a container is simply stored outdoors on the ground. In connection with the surface or circular shape of the container, the smallest possible amount of material is used to delimit the characteristic cross-sectional area. The round shape does not change under the influence of the cargo pressure from the inside and also withstands external stresses better than a polygonal tank. The stacked stack has round, cylindrical containers for optimum tear resistance. A 1 us tasäi1 iöl1ä is also a large 1ämpöeristys iu iu, because the wall or shell contains joukop several cavities on the other side of the fluted corrugated layer makes. " The insulation performance can be increased by using a cover made of expanded plastic.

The invention will be described in more detail with reference to the accompanying drawings, of which

Figure 1 shows an embodiment of a base container made by the method according to the invention,

Figure 2 is a cross-section of the line II-II in Figure 1,

Figure 3 is a cross-sectional view taken along line III-III of Figure 2, and

The figure is a schematic diagram of a method of manufacturing a device according to the invention.

The transport base container of the invention comprises a container 1, which is preferably molded from expanded polystyrene. The container comprises a solid plate 2, the legs of which extend downwards from the bottom surface, in the example shown, three legs 3, arranged so that two openings k are arranged for the insertion of the forks of a conventional fork-lift truck. To avoid unnecessary moments, the corners of the tank are bevelled. To secure the top of the container, the round shell 5 is made of plate layers. The upper opening of the container is closed by a lid 6. It can be seen in the cut part of Figure 1 that the container is filled with bulk 7, e.g. 1000 kg of plastic granules.

11 68581 A practical embodiment of the transport base is evenly shown in Figures 2 and 3. The upper side of the container-shaped part 2 has an upwardly extending round neck 8 to which the shell 5 is attached. The shell consists of several plies of one-half or corrugated cardboard tettua (best seen in Figure 3). The neck 8 has a corrugated perimeter 9 which mates with the corrugation 10 of the innermost corrugated cardboard 11 in the shell. The optimum connection of the shell 5 to the neck 8 is thus achieved. To allow water to drain away so that the lower end of the shell 5 does not get wet, the upper surface of the base may have a sloping edge 12. The inside of the container, the plastic bag or the sack 13 may be 1 i i ma 11 u.

The figure shows how the transport pallet container according to the invention is manufactured. The sack 13 is pulled over the winding mandrel 1 of the winding machine 15. The outer end of the mandrel is provided with a pin 16 which fits into a recess 17 in the upper surface of the base 1. The diameter of the mandrel 14 is the same as the diameter of the neck 8 of the base 1. When the substrate is mounted on the mandrel for this purpose, kääremateri aa-1 i roll 18, e.g. one-sided corrugated cardboard, is discharged and placed on tuurani le, which is then made to rotate. Between the rotating mandrel 1 4 and the roller 18 there is an adhesive applicator 19 for applying adhesive to the sheet material 20 on its inner surface facing the mandrel.

One-sided corrugated cardboard is wound with the corrugated side facing inwardly toward the mandrel. In this way a soft and strong outer surface is achieved in the finished shell 5, and as mentioned above, a very good bond between the shell 5 and the neck 8 is also achieved if the circumference of the neck is given a wavy shape which is compatible with the material to be rotated. If the plastic sack 13 is placed in the mandrel before the start of the rotational movement, the adhesive is placed on the mandrel side of the entire rotating material, and the first round of corrugated corrugated cardboard is then glued to the sack. If for some reason it is not desired to include a sack, the layer of the first shell 5 must be without glue on the initial part which will be in contact with the mandrel and be provided with glue only on the part which rests around the neck 8.

5,68581

To facilitate removal of the shell 5 from the mandrel, the mandrel may either be dismantled, or air may be introduced inside the mandrel through the small nozzle openings of the mandrel between the mandrel and the twisted shell.

By placing a plastic bag inside the container already at the manufacturing stage, more efficient production is achieved compared to previous production methods, because placing such a large bag in the finished container is a time-consuming task.

Claims (2)

6 PATENT CLAIMS 68581 A method and for producing flat containers, which base-container comprises a base and a container attached to its upper side, and which is specially intended for transporting and storing bulk material 1 in, such as plastic granules or the like, characterized in that the finished base (1) has a round or substantially a round neck (8) connected at its end surface to the end of a winding mandrel (1A) having a diameter substantially equal to the diameter of the neck, the one-sided corrugated board (5) having brushed glue being twisted several turns by the mandrel (IA) and the base (1) around the neck (8) so that the turns become glued to each other and to the neck. A method according to claim 1, characterized in that a waterproof bag (13) of suitable material, preferably plastic, is pulled over the mandrel (1A) before the base (1) is attached to the end of the mandrel, whereby the twisted shell is glued to the bag.