CN1116413A - Method for separately manufacturing substantially cylindrical containers from sleeve-shaped semi-finished products, sleeve-shaped semi-finished products and apparatus for deforming sleeve-shaped semi-finished products - Google Patents

Abstract

Method for manufacturing an essentially cylindrical receptacle. Because it is difficult to transport such receptacles efficiently, it is proposed initially to manufacture a semifinished article consisting of a sleeve-shaped part provided with a protective layer at least on the inside, which part is readily stackable and, after the very efficient transportation thereof, can be deformed at a second location into a conventional cylindrical holder, with subsequent fitting of at least one base. In order to deform a sleeve-shaped wall into a cylindrical holder, with the fitting of at least the base, considerably less equipment is required than for the manufacture of a completely cylindrical receptacle.

Description

Method for separately manufacturing substantially cylindrical containers from sleeve-shaped semi-finished products, sleeve-shaped semi-finished products and apparatus for deforming sleeve-shaped semi-finished products

The invention relates to a method according to the preamble of claim 1 .

French patent specification 2,343,656 describes a method of manufacturing cylindrical containers at two locations.

At a first location, a sleeve-shaped, in particular conical, wall is produced which is provided with a base. These conical semi-finished products are nested in a stack to improve transport efficiency. After all, transporting cylindrical containers of the same size that cannot be nested within each other is effectively tantamount to transporting "air", and therefore transport costs are extremely high.

According to the French patent specification, a further treatment is then carried out at a second location, ie outwardly pressing at least the smallest diameter portion at the bottom of the conical sleeve. In this case special treatment has to be done in the bottom area. The last embodiment proposes to deform the bottom only slightly and to bevel the portion of the conical sleeve adjacent the bottom so that this portion actually forms part of the bottom.

The disadvantage of this method is that the container thus produced differs from conventional containers which are generally accepted by people. Therefore, such containers have not yet been able to enter the market. Moreover, in transforming the conical sleeve into a cylindrical sleeve, the junction between the bottom and the bottom of the sleeve-shaped wall is subjected to considerable stress, resulting in practically a gap between the bottom and the wall that is only revealed in later use. The problem of poor internal sealing.

The aim of the present invention is to overcome these disadvantages.

This object is achieved by the features of claim 1 in the above described manner. According to the invention, the bottom is attached after transport and after the sleeve-shaped part has been deformed to its final dimensions, so that a container with a general appearance is produced. The usual appearance is maintained especially near the bottom. Furthermore, the hem seam or weld seam between the base and the sleeve-shaped part is not subject to deformation stresses, so that unfavorable transport and storage conditions have no effect on the final product. Finally, according to the invention, the sleeve-shaped wall is surface-treated prior to transport.

This makes it possible to coat at least one surface of the blank before forming the sleeve-shaped wall from the blank. It is very advantageous to apply the coating before producing the sleeve-shaped wall, since the coating process can then be carried out on a larger scale. In particular, most of the investment is spent on equipment for painting or other coating operations. They relate to the production efficiency of the coating material and must meet environmental/engineering requirements. This painting sequence can therefore be used both for coating the blanks used to make right cylindrical containers, container lids and container bottoms, and for the coating of blanks used to make the aforementioned sleeve-shaped walls. Under this arrangement, the blank treated with such a coating can be transported over a long distance to the equipment for making the sleeve-shaped part from the blank. Obviously, if welding is used to make the sealed sleeve-shaped wall, the free end of the blank should not be coated if the coating interferes with the welding. A coating may be partially formed at a later stage. This coating can be a powder coating.

According to a preferred embodiment of the present invention, the sleeve-shaped wall portion is subjected to antirust treatment before transportation. This is especially important for containers whose walls are only partially coated. This is the case for most containers. If the container is coated in its entirety, it is not necessary to carry out the anti-rust treatment. In this way, the sleeve-shaped walls can be stored without them immediately getting rusted.

After the sleeve-shaped wall has been deformed into a cylinder with the final shape, the lid can be fitted. Obviously, it is also possible not to provide a cover, but to produce a device with which a detachable cover can be attached by means of a clamping ring, for example.

The connection between the bottom and the sleeve-shaped wall can be achieved by any method known in the art.

The sleeve-shaped wall can be conical or cylindrical. If the sleeve-shaped wall is cylindrical, preferably several sleeve-shaped walls of different diameters are nested together during transport. These sleeve-shaped wall portions are then deformed to different degrees at a second location to obtain final wall portions of substantially the same size. In this case, on the one hand blanks of different lengths can be bent and snapped together to produce different cylindrical wall sections, and on the other hand, identical wall sections of substandard size can be produced first and then subjected to different conditions at a first location. degree of deformation, so that the sleeve-shaped wall parts of different shapes thus produced can be nested together during transportation. In this case, the diameter increase of the cylindrical wall part after one or more deformation operations is preferably not more than 10%. Surprisingly, we have found that, if the tolerances are made precisely, a greater number of telescopically designed cylindrical sleeve-shaped wall. In order to be able to nest the conical wall parts without at the same time keeping the nested wall parts from interlocking and making it difficult to separate, a peripheral flange can be made. They can be done outside or inside the wall. If the conical wall is provided with a bottom, this peripheral flange has to be made on the outside near the free end. If there is no bottom, the circumferential flange can be made on the inside next to the free end with the smaller diameter. The advantage of this latter case is that the peripheral flange can be eliminated later when deforming into a cylindrical wall part. If an outer peripheral flange is formed near the free end of the largest diameter of the wall, for reasons of symmetry, a corresponding peripheral flange is preferably formed near the other end during subsequent deformation into the cylindrical wall. An inner circumferential flange may also be formed when the conical wall portion is deformed into a cylindrical wall portion. This is particularly important when it is desired to obtain a container of maximum external dimensions, where every effort is made to make the container as large as possible while at the same time having sufficient strength, in particular resistance to crushing.

According to a preferred embodiment for producing the inner circumferential bead, the conical wall portion, which originally had a smooth wall, is deformed to form a partial inner circumferential bead.

The invention also relates to the semi-finished product, ie the sleeve-shaped wall, produced using this method. An optimum sleeve effect is achieved if the smallest diameter of the conical wall is 20%, in particular 10%, smaller than the largest diameter. In order to prevent mutual jamming during nesting, the conical walls are preferably provided with external flanges at the point of greatest diameter. An inner flange may also be formed at the smallest diameter portion.

The invention also relates to a container made with a sleeve-shaped wall as described above. At this time, the wall thickness of the container fluctuates due to deformation. This variation is small, preferably less than 5%.

The invention also relates to a device for deforming a conical wall portion into a cylindrical wall portion or a cylindrical wall portion into a larger diameter cylindrical wall portion. According to the invention, the device comprises a wall support, a pipe expander and means for moving the pipe expander in and out of the wall. Obviously, after moving the expander in the inactive state into the wall, the expander will move into the outwardly moved state, thereby deforming the wall into the desired shape.

The invention will be described in detail below with the aid of an exemplary embodiment shown in the drawings. In the attached picture:

Fig. 1 is the sectional view of conical wall portion of the present invention;

Fig. 2 shows that some semi-finished products manufactured by Fig. 1 are nested together;

Figure 3 is a sectional view of another embodiment of a conical wall;

Fig. 4 is a plurality of conical wall portions shown in Fig. 3 nested together;

Figure 5 is a container made of the conical wall of Figure 4;

Fig. 6 is that several sleeve-shaped wall parts that are made into cylindrical shape are nested together, and;

Figure 7 is a schematic illustration of an apparatus for deforming a conical wall portion into a cylindrical wall portion.

The semi-finished product shown in FIG. 1 is indicated generally by reference numeral 1 . Figure 1 also shows that the conical wall has a peripheral flange 6 and has no bottom.

Figure 2 shows such conical wall portions nested within each other. Owing to the presence of the circumferential flanges, mutual jamming is prevented, since the semi-finished products abut against each other via these circumferential flanges. Figure 2 clearly shows that due to the mutual nesting, the volume in transport is greatly reduced.

Figure 3 shows another embodiment of a conical wall. The conical wall is now indicated with 16 . In this embodiment, there is an inwardly projecting peripheral flange 17, as can be seen particularly clearly in FIG. 4, which facilitates the nesting of the conical wall portion 16. The advantage of this embodiment is that the peripheral flange 17 can be eliminated in the deformation during the subsequent deformation into the cylindrical wall part. It is thus not seen that the cylindrical wall portion is made from the original conical wall portion.

Figure 5 shows a container obtained by deforming the conical wall into a cylindrical wall and attaching the bottom. This container is no different from normal containers.

FIG. 6 shows several sleeve-shaped wall portions of cylindrical configuration nested one above the other. These sleeve-shaped walls are indicated with 3 , 4 , 5 , 13 and 18 . The distances between these walls are shown too large in the drawing, many of which are omitted by broken lines. In practice, the distance between the individual wall elements is only a few millimeters.

For example, if 5 cylindrical sleeve wall members are nested together, the outer diameter is 571.5mm and the inner diameter is 539mm. At this time, the outermost sleeve-shaped wall does not need to be deformed, and the deformation of the innermost sleeve-shaped wall is also limited. In the above example, for a wall thickness of 1 mm, the distance between the containers is 1.2mm. If the distance between adjacent sleeve-shaped walls is selected as 0.6mm, and the wall thickness is selected as 1mm, then 10 sleeves can be nested together within the above range, and the deformation of the smallest sleeve does not exceed the final size. 6%. From a manufacturing process point of view, operation is perfectly fine with such tight tolerances. It should be seen that in this way more sleeve-shaped wall parts can be transported per unit volume than if conical sleeve-shaped wall parts were nested one above the other. After all, in the case of telescoping conical walls, there is always the possibility of jamming against each other, in order to avoid jamming, a circumferential flange is necessary, which in turn reduces the utilization of space. Another advantage of using cylindrical sleeve-shaped walls is that all the walls can rest against the transport means, say a container. Whereas in the case of nested conical walls, the lowermost sleeve-shaped wall has to support all other walls.

FIG. 7 schematically shows a device for enlarging the conical wall 1 with reference numeral 20 . The device comprises a stand 21 on which the semi-finished product 1 can be placed. The stand 21 can move up and down by means of a jack 23 . In this way, the conical wall part 1 or the cylindrical wall part 4, 5, 13 or 18 can be moved on an expander cone. After being inserted therein, the expander cone is moved outwardly in a manner not shown so as to form a cylindrical wall portion, and the bottom and lid are fitted to produce the container shown in FIG. 5 . At the same time, before or after this, the respective circumferential flanges can be formed. The semi-finished products 1 are all subjected to anti-rust treatment before transportation. This anti-rust device can then be removed. Obviously, any other known expansion device in the prior art can also be used to replace the expansion cone.

In an exemplary embodiment of the invention, we have found that for a standard container height of 88 cm, conical wall sections can be used, with approximately 12 conical wall sections nested together having a height of 230 cm.

If cylindrical sleeve-shaped walls are used, up to 20 cylindrical sleeves can be nested in a height of less than 200 cm. This clearly represents a significant space savings. In the case of the above-mentioned standard container with a height of 88 cm, we have found it satisfactory to use conical walls having a maximum external diameter of 585 mm and a minimum diameter of 540 mm.

Although the invention has been described above using a preferred embodiment, it should be noted that various changes may be made without departing from the scope of the invention. All prior art for assembling and handling containers can be combined with the present invention, and it is obvious that the claims also apply to this combination.

Claims (13)

1, make the method that is roughly hydrostatic column, comprising:

Make sleeve shaped wall portion and bottom and cap along the circumference closure in first place;

Transportation is nested in sleeve shaped wall portion together mutually, and;

Be deformed into the cylinder of hydrostatic column with final size in the second place grip cylindrical wall portion;

It is characterized in that the bottom just installs in the sleeve shaped wall portion that is deformed into final size in second place;

Before transportation, annular wall is through surface treatment at least.

2, by the described method of claim 1, wherein, this wall portion makes with blank, and at least one surface of this blank is coated with coating.

3, by claim 1 or 2 described methods, wherein, this surface treatment comprises antirust processing.

4, by the described method of above-mentioned arbitrary claim, wherein, this annular wall comprises cylindrical wall.

5, by the described method of claim 4, wherein, the diameter of this ring-shaped cylinder shape wall portion is at most less than 10% of the diameter of the final wall of this hydrostatic column portion.

6, want the described method of arbitrary claim among the right 1-3 by right, wherein, this annular wall is a cone-shaped wall portion.

7, by the described method of claim 6, wherein, there is a circumferential flange of projection inwardly in this cone-shaped wall portion in that the free end of minimum diameter is other.

8, by the described method of claim 7, wherein, this cone-shaped wall portion is at the other circumferential flange that outer process on one day is arranged of the free end of maximum gauge.

9,, wherein, in being deformed into the process that is roughly cylindrical wall, form the circumferential flange of projection inwardly by the described method of above-mentioned arbitrary claim.

10, the cone-shaped wall portion (2) made from plate has a flange (6) at least in that the one end is other, and wherein, the maximum gauge of this wall portion is in fact corresponding to the diameter of volumetric standard, and its minimum diameter is littler by 20% than maximum gauge.

11, by the described cone-shaped wall of claim 10 portion, wherein, this minimum diameter is than the maximum gauge little at least 10% of this wall portion.

12, by claim 10 or 11 described cone-shaped wall portions, wherein, there is a bottom (3) in this wall portion at the smallest end place.

13, the container that comprises a cylindrical wall, at one end there is first thickness in this wall portion, at the other end second thickness is arranged, and wherein, this thickness passes through and reduces continuously substantially.

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